1 // SPDX-License-Identifier: GPL-2.0-only
3 * Copyright 2011 Paul Mackerras, IBM Corp. <paulus@au1.ibm.com>
4 * Copyright (C) 2009. SUSE Linux Products GmbH. All rights reserved.
7 * Paul Mackerras <paulus@au1.ibm.com>
8 * Alexander Graf <agraf@suse.de>
9 * Kevin Wolf <mail@kevin-wolf.de>
11 * Description: KVM functions specific to running on Book 3S
12 * processors in hypervisor mode (specifically POWER7 and later).
14 * This file is derived from arch/powerpc/kvm/book3s.c,
15 * by Alexander Graf <agraf@suse.de>.
18 #include <linux/kvm_host.h>
19 #include <linux/kernel.h>
20 #include <linux/err.h>
21 #include <linux/slab.h>
22 #include <linux/preempt.h>
23 #include <linux/sched/signal.h>
24 #include <linux/sched/stat.h>
25 #include <linux/delay.h>
26 #include <linux/export.h>
28 #include <linux/anon_inodes.h>
29 #include <linux/cpu.h>
30 #include <linux/cpumask.h>
31 #include <linux/spinlock.h>
32 #include <linux/page-flags.h>
33 #include <linux/srcu.h>
34 #include <linux/miscdevice.h>
35 #include <linux/debugfs.h>
36 #include <linux/gfp.h>
37 #include <linux/vmalloc.h>
38 #include <linux/highmem.h>
39 #include <linux/hugetlb.h>
40 #include <linux/kvm_irqfd.h>
41 #include <linux/irqbypass.h>
42 #include <linux/module.h>
43 #include <linux/compiler.h>
45 #include <linux/irqdomain.h>
46 #include <linux/smp.h>
48 #include <asm/ftrace.h>
50 #include <asm/ppc-opcode.h>
51 #include <asm/asm-prototypes.h>
52 #include <asm/archrandom.h>
53 #include <asm/debug.h>
54 #include <asm/disassemble.h>
55 #include <asm/cputable.h>
56 #include <asm/cacheflush.h>
57 #include <linux/uaccess.h>
58 #include <asm/interrupt.h>
60 #include <asm/kvm_ppc.h>
61 #include <asm/kvm_book3s.h>
62 #include <asm/mmu_context.h>
63 #include <asm/lppaca.h>
65 #include <asm/processor.h>
66 #include <asm/cputhreads.h>
68 #include <asm/hvcall.h>
69 #include <asm/switch_to.h>
71 #include <asm/dbell.h>
73 #include <asm/pnv-pci.h>
78 #include <asm/hw_breakpoint.h>
79 #include <asm/kvm_book3s_uvmem.h>
80 #include <asm/ultravisor.h>
82 #include <asm/plpar_wrappers.h>
84 #include <trace/events/ipi.h>
87 #include "book3s_hv.h"
89 #define CREATE_TRACE_POINTS
92 /* #define EXIT_DEBUG */
93 /* #define EXIT_DEBUG_SIMPLE */
94 /* #define EXIT_DEBUG_INT */
96 /* Used to indicate that a guest page fault needs to be handled */
97 #define RESUME_PAGE_FAULT (RESUME_GUEST | RESUME_FLAG_ARCH1)
98 /* Used to indicate that a guest passthrough interrupt needs to be handled */
99 #define RESUME_PASSTHROUGH (RESUME_GUEST | RESUME_FLAG_ARCH2)
101 /* Used as a "null" value for timebase values */
102 #define TB_NIL (~(u64)0)
104 static DECLARE_BITMAP(default_enabled_hcalls, MAX_HCALL_OPCODE/4 + 1);
106 static int dynamic_mt_modes = 6;
107 module_param(dynamic_mt_modes, int, 0644);
108 MODULE_PARM_DESC(dynamic_mt_modes, "Set of allowed dynamic micro-threading modes: 0 (= none), 2, 4, or 6 (= 2 or 4)");
109 static int target_smt_mode;
110 module_param(target_smt_mode, int, 0644);
111 MODULE_PARM_DESC(target_smt_mode, "Target threads per core (0 = max)");
113 static bool one_vm_per_core;
114 module_param(one_vm_per_core, bool, S_IRUGO | S_IWUSR);
115 MODULE_PARM_DESC(one_vm_per_core, "Only run vCPUs from the same VM on a core (requires POWER8 or older)");
117 #ifdef CONFIG_KVM_XICS
118 static const struct kernel_param_ops module_param_ops = {
119 .set = param_set_int,
120 .get = param_get_int,
123 module_param_cb(kvm_irq_bypass, &module_param_ops, &kvm_irq_bypass, 0644);
124 MODULE_PARM_DESC(kvm_irq_bypass, "Bypass passthrough interrupt optimization");
126 module_param_cb(h_ipi_redirect, &module_param_ops, &h_ipi_redirect, 0644);
127 MODULE_PARM_DESC(h_ipi_redirect, "Redirect H_IPI wakeup to a free host core");
130 /* If set, guests are allowed to create and control nested guests */
131 static bool nested = true;
132 module_param(nested, bool, S_IRUGO | S_IWUSR);
133 MODULE_PARM_DESC(nested, "Enable nested virtualization (only on POWER9)");
135 static int kvmppc_hv_setup_htab_rma(struct kvm_vcpu *vcpu);
138 * RWMR values for POWER8. These control the rate at which PURR
139 * and SPURR count and should be set according to the number of
140 * online threads in the vcore being run.
142 #define RWMR_RPA_P8_1THREAD 0x164520C62609AECAUL
143 #define RWMR_RPA_P8_2THREAD 0x7FFF2908450D8DA9UL
144 #define RWMR_RPA_P8_3THREAD 0x164520C62609AECAUL
145 #define RWMR_RPA_P8_4THREAD 0x199A421245058DA9UL
146 #define RWMR_RPA_P8_5THREAD 0x164520C62609AECAUL
147 #define RWMR_RPA_P8_6THREAD 0x164520C62609AECAUL
148 #define RWMR_RPA_P8_7THREAD 0x164520C62609AECAUL
149 #define RWMR_RPA_P8_8THREAD 0x164520C62609AECAUL
151 static unsigned long p8_rwmr_values[MAX_SMT_THREADS + 1] = {
163 static inline struct kvm_vcpu *next_runnable_thread(struct kvmppc_vcore *vc,
167 struct kvm_vcpu *vcpu;
169 while (++i < MAX_SMT_THREADS) {
170 vcpu = READ_ONCE(vc->runnable_threads[i]);
179 /* Used to traverse the list of runnable threads for a given vcore */
180 #define for_each_runnable_thread(i, vcpu, vc) \
181 for (i = -1; (vcpu = next_runnable_thread(vc, &i)); )
183 static bool kvmppc_ipi_thread(int cpu)
185 unsigned long msg = PPC_DBELL_TYPE(PPC_DBELL_SERVER);
187 /* If we're a nested hypervisor, fall back to ordinary IPIs for now */
188 if (kvmhv_on_pseries())
191 /* On POWER9 we can use msgsnd to IPI any cpu */
192 if (cpu_has_feature(CPU_FTR_ARCH_300)) {
193 msg |= get_hard_smp_processor_id(cpu);
195 __asm__ __volatile__ (PPC_MSGSND(%0) : : "r" (msg));
199 /* On POWER8 for IPIs to threads in the same core, use msgsnd */
200 if (cpu_has_feature(CPU_FTR_ARCH_207S)) {
202 if (cpu_first_thread_sibling(cpu) ==
203 cpu_first_thread_sibling(smp_processor_id())) {
204 msg |= cpu_thread_in_core(cpu);
206 __asm__ __volatile__ (PPC_MSGSND(%0) : : "r" (msg));
213 #if defined(CONFIG_PPC_ICP_NATIVE) && defined(CONFIG_SMP)
214 if (cpu >= 0 && cpu < nr_cpu_ids) {
215 if (paca_ptrs[cpu]->kvm_hstate.xics_phys) {
219 opal_int_set_mfrr(get_hard_smp_processor_id(cpu), IPI_PRIORITY);
227 static void kvmppc_fast_vcpu_kick_hv(struct kvm_vcpu *vcpu)
230 struct rcuwait *waitp;
233 * rcuwait_wake_up contains smp_mb() which orders prior stores that
234 * create pending work vs below loads of cpu fields. The other side
235 * is the barrier in vcpu run that orders setting the cpu fields vs
236 * testing for pending work.
239 waitp = kvm_arch_vcpu_get_wait(vcpu);
240 if (rcuwait_wake_up(waitp))
241 ++vcpu->stat.generic.halt_wakeup;
243 cpu = READ_ONCE(vcpu->arch.thread_cpu);
244 if (cpu >= 0 && kvmppc_ipi_thread(cpu))
247 /* CPU points to the first thread of the core */
249 if (cpu >= 0 && cpu < nr_cpu_ids && cpu_online(cpu))
250 smp_send_reschedule(cpu);
254 * We use the vcpu_load/put functions to measure stolen time.
256 * Stolen time is counted as time when either the vcpu is able to
257 * run as part of a virtual core, but the task running the vcore
258 * is preempted or sleeping, or when the vcpu needs something done
259 * in the kernel by the task running the vcpu, but that task is
260 * preempted or sleeping. Those two things have to be counted
261 * separately, since one of the vcpu tasks will take on the job
262 * of running the core, and the other vcpu tasks in the vcore will
263 * sleep waiting for it to do that, but that sleep shouldn't count
266 * Hence we accumulate stolen time when the vcpu can run as part of
267 * a vcore using vc->stolen_tb, and the stolen time when the vcpu
268 * needs its task to do other things in the kernel (for example,
269 * service a page fault) in busy_stolen. We don't accumulate
270 * stolen time for a vcore when it is inactive, or for a vcpu
271 * when it is in state RUNNING or NOTREADY. NOTREADY is a bit of
272 * a misnomer; it means that the vcpu task is not executing in
273 * the KVM_VCPU_RUN ioctl, i.e. it is in userspace or elsewhere in
274 * the kernel. We don't have any way of dividing up that time
275 * between time that the vcpu is genuinely stopped, time that
276 * the task is actively working on behalf of the vcpu, and time
277 * that the task is preempted, so we don't count any of it as
280 * Updates to busy_stolen are protected by arch.tbacct_lock;
281 * updates to vc->stolen_tb are protected by the vcore->stoltb_lock
282 * lock. The stolen times are measured in units of timebase ticks.
283 * (Note that the != TB_NIL checks below are purely defensive;
284 * they should never fail.)
286 * The POWER9 path is simpler, one vcpu per virtual core so the
287 * former case does not exist. If a vcpu is preempted when it is
288 * BUSY_IN_HOST and not ceded or otherwise blocked, then accumulate
289 * the stolen cycles in busy_stolen. RUNNING is not a preemptible
290 * state in the P9 path.
293 static void kvmppc_core_start_stolen(struct kvmppc_vcore *vc, u64 tb)
297 WARN_ON_ONCE(cpu_has_feature(CPU_FTR_ARCH_300));
299 spin_lock_irqsave(&vc->stoltb_lock, flags);
301 spin_unlock_irqrestore(&vc->stoltb_lock, flags);
304 static void kvmppc_core_end_stolen(struct kvmppc_vcore *vc, u64 tb)
308 WARN_ON_ONCE(cpu_has_feature(CPU_FTR_ARCH_300));
310 spin_lock_irqsave(&vc->stoltb_lock, flags);
311 if (vc->preempt_tb != TB_NIL) {
312 vc->stolen_tb += tb - vc->preempt_tb;
313 vc->preempt_tb = TB_NIL;
315 spin_unlock_irqrestore(&vc->stoltb_lock, flags);
318 static void kvmppc_core_vcpu_load_hv(struct kvm_vcpu *vcpu, int cpu)
320 struct kvmppc_vcore *vc = vcpu->arch.vcore;
324 if (cpu_has_feature(CPU_FTR_ARCH_300)) {
325 if (vcpu->arch.busy_preempt != TB_NIL) {
326 WARN_ON_ONCE(vcpu->arch.state != KVMPPC_VCPU_BUSY_IN_HOST);
327 vc->stolen_tb += mftb() - vcpu->arch.busy_preempt;
328 vcpu->arch.busy_preempt = TB_NIL;
336 * We can test vc->runner without taking the vcore lock,
337 * because only this task ever sets vc->runner to this
338 * vcpu, and once it is set to this vcpu, only this task
339 * ever sets it to NULL.
341 if (vc->runner == vcpu && vc->vcore_state >= VCORE_SLEEPING)
342 kvmppc_core_end_stolen(vc, now);
344 spin_lock_irqsave(&vcpu->arch.tbacct_lock, flags);
345 if (vcpu->arch.state == KVMPPC_VCPU_BUSY_IN_HOST &&
346 vcpu->arch.busy_preempt != TB_NIL) {
347 vcpu->arch.busy_stolen += now - vcpu->arch.busy_preempt;
348 vcpu->arch.busy_preempt = TB_NIL;
350 spin_unlock_irqrestore(&vcpu->arch.tbacct_lock, flags);
353 static void kvmppc_core_vcpu_put_hv(struct kvm_vcpu *vcpu)
355 struct kvmppc_vcore *vc = vcpu->arch.vcore;
359 if (cpu_has_feature(CPU_FTR_ARCH_300)) {
361 * In the P9 path, RUNNABLE is not preemptible
362 * (nor takes host interrupts)
364 WARN_ON_ONCE(vcpu->arch.state == KVMPPC_VCPU_RUNNABLE);
366 * Account stolen time when preempted while the vcpu task is
367 * running in the kernel (but not in qemu, which is INACTIVE).
369 if (task_is_running(current) &&
370 vcpu->arch.state == KVMPPC_VCPU_BUSY_IN_HOST)
371 vcpu->arch.busy_preempt = mftb();
377 if (vc->runner == vcpu && vc->vcore_state >= VCORE_SLEEPING)
378 kvmppc_core_start_stolen(vc, now);
380 spin_lock_irqsave(&vcpu->arch.tbacct_lock, flags);
381 if (vcpu->arch.state == KVMPPC_VCPU_BUSY_IN_HOST)
382 vcpu->arch.busy_preempt = now;
383 spin_unlock_irqrestore(&vcpu->arch.tbacct_lock, flags);
386 static void kvmppc_set_pvr_hv(struct kvm_vcpu *vcpu, u32 pvr)
388 vcpu->arch.pvr = pvr;
391 /* Dummy value used in computing PCR value below */
392 #define PCR_ARCH_31 (PCR_ARCH_300 << 1)
394 static int kvmppc_set_arch_compat(struct kvm_vcpu *vcpu, u32 arch_compat)
396 unsigned long host_pcr_bit = 0, guest_pcr_bit = 0;
397 struct kvmppc_vcore *vc = vcpu->arch.vcore;
399 /* We can (emulate) our own architecture version and anything older */
400 if (cpu_has_feature(CPU_FTR_ARCH_31))
401 host_pcr_bit = PCR_ARCH_31;
402 else if (cpu_has_feature(CPU_FTR_ARCH_300))
403 host_pcr_bit = PCR_ARCH_300;
404 else if (cpu_has_feature(CPU_FTR_ARCH_207S))
405 host_pcr_bit = PCR_ARCH_207;
406 else if (cpu_has_feature(CPU_FTR_ARCH_206))
407 host_pcr_bit = PCR_ARCH_206;
409 host_pcr_bit = PCR_ARCH_205;
411 /* Determine lowest PCR bit needed to run guest in given PVR level */
412 guest_pcr_bit = host_pcr_bit;
414 switch (arch_compat) {
416 guest_pcr_bit = PCR_ARCH_205;
420 guest_pcr_bit = PCR_ARCH_206;
423 guest_pcr_bit = PCR_ARCH_207;
426 guest_pcr_bit = PCR_ARCH_300;
429 guest_pcr_bit = PCR_ARCH_31;
436 /* Check requested PCR bits don't exceed our capabilities */
437 if (guest_pcr_bit > host_pcr_bit)
440 spin_lock(&vc->lock);
441 vc->arch_compat = arch_compat;
443 * Set all PCR bits for which guest_pcr_bit <= bit < host_pcr_bit
444 * Also set all reserved PCR bits
446 vc->pcr = (host_pcr_bit - guest_pcr_bit) | PCR_MASK;
447 spin_unlock(&vc->lock);
452 static void kvmppc_dump_regs(struct kvm_vcpu *vcpu)
456 pr_err("vcpu %p (%d):\n", vcpu, vcpu->vcpu_id);
457 pr_err("pc = %.16lx msr = %.16llx trap = %x\n",
458 vcpu->arch.regs.nip, vcpu->arch.shregs.msr, vcpu->arch.trap);
459 for (r = 0; r < 16; ++r)
460 pr_err("r%2d = %.16lx r%d = %.16lx\n",
461 r, kvmppc_get_gpr(vcpu, r),
462 r+16, kvmppc_get_gpr(vcpu, r+16));
463 pr_err("ctr = %.16lx lr = %.16lx\n",
464 vcpu->arch.regs.ctr, vcpu->arch.regs.link);
465 pr_err("srr0 = %.16llx srr1 = %.16llx\n",
466 vcpu->arch.shregs.srr0, vcpu->arch.shregs.srr1);
467 pr_err("sprg0 = %.16llx sprg1 = %.16llx\n",
468 vcpu->arch.shregs.sprg0, vcpu->arch.shregs.sprg1);
469 pr_err("sprg2 = %.16llx sprg3 = %.16llx\n",
470 vcpu->arch.shregs.sprg2, vcpu->arch.shregs.sprg3);
471 pr_err("cr = %.8lx xer = %.16lx dsisr = %.8x\n",
472 vcpu->arch.regs.ccr, vcpu->arch.regs.xer, vcpu->arch.shregs.dsisr);
473 pr_err("dar = %.16llx\n", vcpu->arch.shregs.dar);
474 pr_err("fault dar = %.16lx dsisr = %.8x\n",
475 vcpu->arch.fault_dar, vcpu->arch.fault_dsisr);
476 pr_err("SLB (%d entries):\n", vcpu->arch.slb_max);
477 for (r = 0; r < vcpu->arch.slb_max; ++r)
478 pr_err(" ESID = %.16llx VSID = %.16llx\n",
479 vcpu->arch.slb[r].orige, vcpu->arch.slb[r].origv);
480 pr_err("lpcr = %.16lx sdr1 = %.16lx last_inst = %.16lx\n",
481 vcpu->arch.vcore->lpcr, vcpu->kvm->arch.sdr1,
482 vcpu->arch.last_inst);
485 static struct kvm_vcpu *kvmppc_find_vcpu(struct kvm *kvm, int id)
487 return kvm_get_vcpu_by_id(kvm, id);
490 static void init_vpa(struct kvm_vcpu *vcpu, struct lppaca *vpa)
492 vpa->__old_status |= LPPACA_OLD_SHARED_PROC;
493 vpa->yield_count = cpu_to_be32(1);
496 static int set_vpa(struct kvm_vcpu *vcpu, struct kvmppc_vpa *v,
497 unsigned long addr, unsigned long len)
499 /* check address is cacheline aligned */
500 if (addr & (L1_CACHE_BYTES - 1))
502 spin_lock(&vcpu->arch.vpa_update_lock);
503 if (v->next_gpa != addr || v->len != len) {
505 v->len = addr ? len : 0;
506 v->update_pending = 1;
508 spin_unlock(&vcpu->arch.vpa_update_lock);
512 /* Length for a per-processor buffer is passed in at offset 4 in the buffer */
521 static int vpa_is_registered(struct kvmppc_vpa *vpap)
523 if (vpap->update_pending)
524 return vpap->next_gpa != 0;
525 return vpap->pinned_addr != NULL;
528 static unsigned long do_h_register_vpa(struct kvm_vcpu *vcpu,
530 unsigned long vcpuid, unsigned long vpa)
532 struct kvm *kvm = vcpu->kvm;
533 unsigned long len, nb;
535 struct kvm_vcpu *tvcpu;
538 struct kvmppc_vpa *vpap;
540 tvcpu = kvmppc_find_vcpu(kvm, vcpuid);
544 subfunc = (flags >> H_VPA_FUNC_SHIFT) & H_VPA_FUNC_MASK;
545 if (subfunc == H_VPA_REG_VPA || subfunc == H_VPA_REG_DTL ||
546 subfunc == H_VPA_REG_SLB) {
547 /* Registering new area - address must be cache-line aligned */
548 if ((vpa & (L1_CACHE_BYTES - 1)) || !vpa)
551 /* convert logical addr to kernel addr and read length */
552 va = kvmppc_pin_guest_page(kvm, vpa, &nb);
555 if (subfunc == H_VPA_REG_VPA)
556 len = be16_to_cpu(((struct reg_vpa *)va)->length.hword);
558 len = be32_to_cpu(((struct reg_vpa *)va)->length.word);
559 kvmppc_unpin_guest_page(kvm, va, vpa, false);
562 if (len > nb || len < sizeof(struct reg_vpa))
571 spin_lock(&tvcpu->arch.vpa_update_lock);
574 case H_VPA_REG_VPA: /* register VPA */
576 * The size of our lppaca is 1kB because of the way we align
577 * it for the guest to avoid crossing a 4kB boundary. We only
578 * use 640 bytes of the structure though, so we should accept
579 * clients that set a size of 640.
581 BUILD_BUG_ON(sizeof(struct lppaca) != 640);
582 if (len < sizeof(struct lppaca))
584 vpap = &tvcpu->arch.vpa;
588 case H_VPA_REG_DTL: /* register DTL */
589 if (len < sizeof(struct dtl_entry))
591 len -= len % sizeof(struct dtl_entry);
593 /* Check that they have previously registered a VPA */
595 if (!vpa_is_registered(&tvcpu->arch.vpa))
598 vpap = &tvcpu->arch.dtl;
602 case H_VPA_REG_SLB: /* register SLB shadow buffer */
603 /* Check that they have previously registered a VPA */
605 if (!vpa_is_registered(&tvcpu->arch.vpa))
608 vpap = &tvcpu->arch.slb_shadow;
612 case H_VPA_DEREG_VPA: /* deregister VPA */
613 /* Check they don't still have a DTL or SLB buf registered */
615 if (vpa_is_registered(&tvcpu->arch.dtl) ||
616 vpa_is_registered(&tvcpu->arch.slb_shadow))
619 vpap = &tvcpu->arch.vpa;
623 case H_VPA_DEREG_DTL: /* deregister DTL */
624 vpap = &tvcpu->arch.dtl;
628 case H_VPA_DEREG_SLB: /* deregister SLB shadow buffer */
629 vpap = &tvcpu->arch.slb_shadow;
635 vpap->next_gpa = vpa;
637 vpap->update_pending = 1;
640 spin_unlock(&tvcpu->arch.vpa_update_lock);
645 static void kvmppc_update_vpa(struct kvm_vcpu *vcpu, struct kvmppc_vpa *vpap)
647 struct kvm *kvm = vcpu->kvm;
653 * We need to pin the page pointed to by vpap->next_gpa,
654 * but we can't call kvmppc_pin_guest_page under the lock
655 * as it does get_user_pages() and down_read(). So we
656 * have to drop the lock, pin the page, then get the lock
657 * again and check that a new area didn't get registered
661 gpa = vpap->next_gpa;
662 spin_unlock(&vcpu->arch.vpa_update_lock);
666 va = kvmppc_pin_guest_page(kvm, gpa, &nb);
667 spin_lock(&vcpu->arch.vpa_update_lock);
668 if (gpa == vpap->next_gpa)
670 /* sigh... unpin that one and try again */
672 kvmppc_unpin_guest_page(kvm, va, gpa, false);
675 vpap->update_pending = 0;
676 if (va && nb < vpap->len) {
678 * If it's now too short, it must be that userspace
679 * has changed the mappings underlying guest memory,
680 * so unregister the region.
682 kvmppc_unpin_guest_page(kvm, va, gpa, false);
685 if (vpap->pinned_addr)
686 kvmppc_unpin_guest_page(kvm, vpap->pinned_addr, vpap->gpa,
689 vpap->pinned_addr = va;
692 vpap->pinned_end = va + vpap->len;
695 static void kvmppc_update_vpas(struct kvm_vcpu *vcpu)
697 if (!(vcpu->arch.vpa.update_pending ||
698 vcpu->arch.slb_shadow.update_pending ||
699 vcpu->arch.dtl.update_pending))
702 spin_lock(&vcpu->arch.vpa_update_lock);
703 if (vcpu->arch.vpa.update_pending) {
704 kvmppc_update_vpa(vcpu, &vcpu->arch.vpa);
705 if (vcpu->arch.vpa.pinned_addr)
706 init_vpa(vcpu, vcpu->arch.vpa.pinned_addr);
708 if (vcpu->arch.dtl.update_pending) {
709 kvmppc_update_vpa(vcpu, &vcpu->arch.dtl);
710 vcpu->arch.dtl_ptr = vcpu->arch.dtl.pinned_addr;
711 vcpu->arch.dtl_index = 0;
713 if (vcpu->arch.slb_shadow.update_pending)
714 kvmppc_update_vpa(vcpu, &vcpu->arch.slb_shadow);
715 spin_unlock(&vcpu->arch.vpa_update_lock);
719 * Return the accumulated stolen time for the vcore up until `now'.
720 * The caller should hold the vcore lock.
722 static u64 vcore_stolen_time(struct kvmppc_vcore *vc, u64 now)
727 WARN_ON_ONCE(cpu_has_feature(CPU_FTR_ARCH_300));
729 spin_lock_irqsave(&vc->stoltb_lock, flags);
731 if (vc->vcore_state != VCORE_INACTIVE &&
732 vc->preempt_tb != TB_NIL)
733 p += now - vc->preempt_tb;
734 spin_unlock_irqrestore(&vc->stoltb_lock, flags);
738 static void __kvmppc_create_dtl_entry(struct kvm_vcpu *vcpu,
740 unsigned int pcpu, u64 now,
741 unsigned long stolen)
743 struct dtl_entry *dt;
745 dt = vcpu->arch.dtl_ptr;
750 dt->dispatch_reason = 7;
751 dt->preempt_reason = 0;
752 dt->processor_id = cpu_to_be16(pcpu + vcpu->arch.ptid);
753 dt->enqueue_to_dispatch_time = cpu_to_be32(stolen);
754 dt->ready_to_enqueue_time = 0;
755 dt->waiting_to_ready_time = 0;
756 dt->timebase = cpu_to_be64(now);
758 dt->srr0 = cpu_to_be64(kvmppc_get_pc(vcpu));
759 dt->srr1 = cpu_to_be64(vcpu->arch.shregs.msr);
762 if (dt == vcpu->arch.dtl.pinned_end)
763 dt = vcpu->arch.dtl.pinned_addr;
764 vcpu->arch.dtl_ptr = dt;
765 /* order writing *dt vs. writing vpa->dtl_idx */
767 vpa->dtl_idx = cpu_to_be64(++vcpu->arch.dtl_index);
769 /* vcpu->arch.dtl.dirty is set by the caller */
772 static void kvmppc_update_vpa_dispatch(struct kvm_vcpu *vcpu,
773 struct kvmppc_vcore *vc)
776 unsigned long stolen;
777 unsigned long core_stolen;
781 vpa = vcpu->arch.vpa.pinned_addr;
787 core_stolen = vcore_stolen_time(vc, now);
788 stolen = core_stolen - vcpu->arch.stolen_logged;
789 vcpu->arch.stolen_logged = core_stolen;
790 spin_lock_irqsave(&vcpu->arch.tbacct_lock, flags);
791 stolen += vcpu->arch.busy_stolen;
792 vcpu->arch.busy_stolen = 0;
793 spin_unlock_irqrestore(&vcpu->arch.tbacct_lock, flags);
795 vpa->enqueue_dispatch_tb = cpu_to_be64(be64_to_cpu(vpa->enqueue_dispatch_tb) + stolen);
797 __kvmppc_create_dtl_entry(vcpu, vpa, vc->pcpu, now + vc->tb_offset, stolen);
799 vcpu->arch.vpa.dirty = true;
802 static void kvmppc_update_vpa_dispatch_p9(struct kvm_vcpu *vcpu,
803 struct kvmppc_vcore *vc,
807 unsigned long stolen;
808 unsigned long stolen_delta;
810 vpa = vcpu->arch.vpa.pinned_addr;
814 stolen = vc->stolen_tb;
815 stolen_delta = stolen - vcpu->arch.stolen_logged;
816 vcpu->arch.stolen_logged = stolen;
818 vpa->enqueue_dispatch_tb = cpu_to_be64(stolen);
820 __kvmppc_create_dtl_entry(vcpu, vpa, vc->pcpu, now, stolen_delta);
822 vcpu->arch.vpa.dirty = true;
825 /* See if there is a doorbell interrupt pending for a vcpu */
826 static bool kvmppc_doorbell_pending(struct kvm_vcpu *vcpu)
829 struct kvmppc_vcore *vc;
831 if (vcpu->arch.doorbell_request)
833 if (cpu_has_feature(CPU_FTR_ARCH_300))
836 * Ensure that the read of vcore->dpdes comes after the read
837 * of vcpu->doorbell_request. This barrier matches the
838 * smp_wmb() in kvmppc_guest_entry_inject().
841 vc = vcpu->arch.vcore;
842 thr = vcpu->vcpu_id - vc->first_vcpuid;
843 return !!(vc->dpdes & (1 << thr));
846 static bool kvmppc_power8_compatible(struct kvm_vcpu *vcpu)
848 if (vcpu->arch.vcore->arch_compat >= PVR_ARCH_207)
850 if ((!vcpu->arch.vcore->arch_compat) &&
851 cpu_has_feature(CPU_FTR_ARCH_207S))
856 static int kvmppc_h_set_mode(struct kvm_vcpu *vcpu, unsigned long mflags,
857 unsigned long resource, unsigned long value1,
858 unsigned long value2)
861 case H_SET_MODE_RESOURCE_SET_CIABR:
862 if (!kvmppc_power8_compatible(vcpu))
867 return H_UNSUPPORTED_FLAG_START;
868 /* Guests can't breakpoint the hypervisor */
869 if ((value1 & CIABR_PRIV) == CIABR_PRIV_HYPER)
871 vcpu->arch.ciabr = value1;
873 case H_SET_MODE_RESOURCE_SET_DAWR0:
874 if (!kvmppc_power8_compatible(vcpu))
876 if (!ppc_breakpoint_available())
879 return H_UNSUPPORTED_FLAG_START;
880 if (value2 & DABRX_HYP)
882 vcpu->arch.dawr0 = value1;
883 vcpu->arch.dawrx0 = value2;
885 case H_SET_MODE_RESOURCE_SET_DAWR1:
886 if (!kvmppc_power8_compatible(vcpu))
888 if (!ppc_breakpoint_available())
890 if (!cpu_has_feature(CPU_FTR_DAWR1))
892 if (!vcpu->kvm->arch.dawr1_enabled)
895 return H_UNSUPPORTED_FLAG_START;
896 if (value2 & DABRX_HYP)
898 vcpu->arch.dawr1 = value1;
899 vcpu->arch.dawrx1 = value2;
901 case H_SET_MODE_RESOURCE_ADDR_TRANS_MODE:
903 * KVM does not support mflags=2 (AIL=2) and AIL=1 is reserved.
904 * Keep this in synch with kvmppc_filter_guest_lpcr_hv.
906 if (cpu_has_feature(CPU_FTR_P9_RADIX_PREFETCH_BUG) &&
907 kvmhv_vcpu_is_radix(vcpu) && mflags == 3)
908 return H_UNSUPPORTED_FLAG_START;
915 /* Copy guest memory in place - must reside within a single memslot */
916 static int kvmppc_copy_guest(struct kvm *kvm, gpa_t to, gpa_t from,
919 struct kvm_memory_slot *to_memslot = NULL;
920 struct kvm_memory_slot *from_memslot = NULL;
921 unsigned long to_addr, from_addr;
924 /* Get HPA for from address */
925 from_memslot = gfn_to_memslot(kvm, from >> PAGE_SHIFT);
928 if ((from + len) >= ((from_memslot->base_gfn + from_memslot->npages)
931 from_addr = gfn_to_hva_memslot(from_memslot, from >> PAGE_SHIFT);
932 if (kvm_is_error_hva(from_addr))
934 from_addr |= (from & (PAGE_SIZE - 1));
936 /* Get HPA for to address */
937 to_memslot = gfn_to_memslot(kvm, to >> PAGE_SHIFT);
940 if ((to + len) >= ((to_memslot->base_gfn + to_memslot->npages)
943 to_addr = gfn_to_hva_memslot(to_memslot, to >> PAGE_SHIFT);
944 if (kvm_is_error_hva(to_addr))
946 to_addr |= (to & (PAGE_SIZE - 1));
949 r = raw_copy_in_user((void __user *)to_addr, (void __user *)from_addr,
953 mark_page_dirty(kvm, to >> PAGE_SHIFT);
957 static long kvmppc_h_page_init(struct kvm_vcpu *vcpu, unsigned long flags,
958 unsigned long dest, unsigned long src)
960 u64 pg_sz = SZ_4K; /* 4K page size */
961 u64 pg_mask = SZ_4K - 1;
964 /* Check for invalid flags (H_PAGE_SET_LOANED covers all CMO flags) */
965 if (flags & ~(H_ICACHE_INVALIDATE | H_ICACHE_SYNCHRONIZE |
966 H_ZERO_PAGE | H_COPY_PAGE | H_PAGE_SET_LOANED))
969 /* dest (and src if copy_page flag set) must be page aligned */
970 if ((dest & pg_mask) || ((flags & H_COPY_PAGE) && (src & pg_mask)))
973 /* zero and/or copy the page as determined by the flags */
974 if (flags & H_COPY_PAGE) {
975 ret = kvmppc_copy_guest(vcpu->kvm, dest, src, pg_sz);
978 } else if (flags & H_ZERO_PAGE) {
979 ret = kvm_clear_guest(vcpu->kvm, dest, pg_sz);
984 /* We can ignore the remaining flags */
989 static int kvm_arch_vcpu_yield_to(struct kvm_vcpu *target)
991 struct kvmppc_vcore *vcore = target->arch.vcore;
994 * We expect to have been called by the real mode handler
995 * (kvmppc_rm_h_confer()) which would have directly returned
996 * H_SUCCESS if the source vcore wasn't idle (e.g. if it may
997 * have useful work to do and should not confer) so we don't
1000 * In the case of the P9 single vcpu per vcore case, the real
1001 * mode handler is not called but no other threads are in the
1004 if (!cpu_has_feature(CPU_FTR_ARCH_300)) {
1005 spin_lock(&vcore->lock);
1006 if (target->arch.state == KVMPPC_VCPU_RUNNABLE &&
1007 vcore->vcore_state != VCORE_INACTIVE &&
1009 target = vcore->runner;
1010 spin_unlock(&vcore->lock);
1013 return kvm_vcpu_yield_to(target);
1016 static int kvmppc_get_yield_count(struct kvm_vcpu *vcpu)
1018 int yield_count = 0;
1019 struct lppaca *lppaca;
1021 spin_lock(&vcpu->arch.vpa_update_lock);
1022 lppaca = (struct lppaca *)vcpu->arch.vpa.pinned_addr;
1024 yield_count = be32_to_cpu(lppaca->yield_count);
1025 spin_unlock(&vcpu->arch.vpa_update_lock);
1030 * H_RPT_INVALIDATE hcall handler for nested guests.
1032 * Handles only nested process-scoped invalidation requests in L0.
1034 static int kvmppc_nested_h_rpt_invalidate(struct kvm_vcpu *vcpu)
1036 unsigned long type = kvmppc_get_gpr(vcpu, 6);
1037 unsigned long pid, pg_sizes, start, end;
1040 * The partition-scoped invalidations aren't handled here in L0.
1042 if (type & H_RPTI_TYPE_NESTED)
1045 pid = kvmppc_get_gpr(vcpu, 4);
1046 pg_sizes = kvmppc_get_gpr(vcpu, 7);
1047 start = kvmppc_get_gpr(vcpu, 8);
1048 end = kvmppc_get_gpr(vcpu, 9);
1050 do_h_rpt_invalidate_prt(pid, vcpu->arch.nested->shadow_lpid,
1051 type, pg_sizes, start, end);
1053 kvmppc_set_gpr(vcpu, 3, H_SUCCESS);
1054 return RESUME_GUEST;
1057 static long kvmppc_h_rpt_invalidate(struct kvm_vcpu *vcpu,
1058 unsigned long id, unsigned long target,
1059 unsigned long type, unsigned long pg_sizes,
1060 unsigned long start, unsigned long end)
1062 if (!kvm_is_radix(vcpu->kvm))
1063 return H_UNSUPPORTED;
1069 * Partition-scoped invalidation for nested guests.
1071 if (type & H_RPTI_TYPE_NESTED) {
1072 if (!nesting_enabled(vcpu->kvm))
1075 /* Support only cores as target */
1076 if (target != H_RPTI_TARGET_CMMU)
1079 return do_h_rpt_invalidate_pat(vcpu, id, type, pg_sizes,
1084 * Process-scoped invalidation for L1 guests.
1086 do_h_rpt_invalidate_prt(id, vcpu->kvm->arch.lpid,
1087 type, pg_sizes, start, end);
1091 int kvmppc_pseries_do_hcall(struct kvm_vcpu *vcpu)
1093 struct kvm *kvm = vcpu->kvm;
1094 unsigned long req = kvmppc_get_gpr(vcpu, 3);
1095 unsigned long target, ret = H_SUCCESS;
1097 struct kvm_vcpu *tvcpu;
1100 if (req <= MAX_HCALL_OPCODE &&
1101 !test_bit(req/4, vcpu->kvm->arch.enabled_hcalls))
1106 ret = kvmppc_h_remove(vcpu, kvmppc_get_gpr(vcpu, 4),
1107 kvmppc_get_gpr(vcpu, 5),
1108 kvmppc_get_gpr(vcpu, 6));
1109 if (ret == H_TOO_HARD)
1113 ret = kvmppc_h_enter(vcpu, kvmppc_get_gpr(vcpu, 4),
1114 kvmppc_get_gpr(vcpu, 5),
1115 kvmppc_get_gpr(vcpu, 6),
1116 kvmppc_get_gpr(vcpu, 7));
1117 if (ret == H_TOO_HARD)
1121 ret = kvmppc_h_read(vcpu, kvmppc_get_gpr(vcpu, 4),
1122 kvmppc_get_gpr(vcpu, 5));
1123 if (ret == H_TOO_HARD)
1127 ret = kvmppc_h_clear_mod(vcpu, kvmppc_get_gpr(vcpu, 4),
1128 kvmppc_get_gpr(vcpu, 5));
1129 if (ret == H_TOO_HARD)
1133 ret = kvmppc_h_clear_ref(vcpu, kvmppc_get_gpr(vcpu, 4),
1134 kvmppc_get_gpr(vcpu, 5));
1135 if (ret == H_TOO_HARD)
1139 ret = kvmppc_h_protect(vcpu, kvmppc_get_gpr(vcpu, 4),
1140 kvmppc_get_gpr(vcpu, 5),
1141 kvmppc_get_gpr(vcpu, 6));
1142 if (ret == H_TOO_HARD)
1146 ret = kvmppc_h_bulk_remove(vcpu);
1147 if (ret == H_TOO_HARD)
1154 target = kvmppc_get_gpr(vcpu, 4);
1155 tvcpu = kvmppc_find_vcpu(kvm, target);
1160 tvcpu->arch.prodded = 1;
1161 smp_mb(); /* This orders prodded store vs ceded load */
1162 if (tvcpu->arch.ceded)
1163 kvmppc_fast_vcpu_kick_hv(tvcpu);
1166 target = kvmppc_get_gpr(vcpu, 4);
1169 tvcpu = kvmppc_find_vcpu(kvm, target);
1174 yield_count = kvmppc_get_gpr(vcpu, 5);
1175 if (kvmppc_get_yield_count(tvcpu) != yield_count)
1177 kvm_arch_vcpu_yield_to(tvcpu);
1179 case H_REGISTER_VPA:
1180 ret = do_h_register_vpa(vcpu, kvmppc_get_gpr(vcpu, 4),
1181 kvmppc_get_gpr(vcpu, 5),
1182 kvmppc_get_gpr(vcpu, 6));
1185 if (list_empty(&kvm->arch.rtas_tokens))
1188 idx = srcu_read_lock(&kvm->srcu);
1189 rc = kvmppc_rtas_hcall(vcpu);
1190 srcu_read_unlock(&kvm->srcu, idx);
1197 /* Send the error out to userspace via KVM_RUN */
1199 case H_LOGICAL_CI_LOAD:
1200 ret = kvmppc_h_logical_ci_load(vcpu);
1201 if (ret == H_TOO_HARD)
1204 case H_LOGICAL_CI_STORE:
1205 ret = kvmppc_h_logical_ci_store(vcpu);
1206 if (ret == H_TOO_HARD)
1210 ret = kvmppc_h_set_mode(vcpu, kvmppc_get_gpr(vcpu, 4),
1211 kvmppc_get_gpr(vcpu, 5),
1212 kvmppc_get_gpr(vcpu, 6),
1213 kvmppc_get_gpr(vcpu, 7));
1214 if (ret == H_TOO_HARD)
1223 if (kvmppc_xics_enabled(vcpu)) {
1224 if (xics_on_xive()) {
1225 ret = H_NOT_AVAILABLE;
1226 return RESUME_GUEST;
1228 ret = kvmppc_xics_hcall(vcpu, req);
1233 ret = kvmppc_h_set_dabr(vcpu, kvmppc_get_gpr(vcpu, 4));
1236 ret = kvmppc_h_set_xdabr(vcpu, kvmppc_get_gpr(vcpu, 4),
1237 kvmppc_get_gpr(vcpu, 5));
1239 #ifdef CONFIG_SPAPR_TCE_IOMMU
1241 ret = kvmppc_h_get_tce(vcpu, kvmppc_get_gpr(vcpu, 4),
1242 kvmppc_get_gpr(vcpu, 5));
1243 if (ret == H_TOO_HARD)
1247 ret = kvmppc_h_put_tce(vcpu, kvmppc_get_gpr(vcpu, 4),
1248 kvmppc_get_gpr(vcpu, 5),
1249 kvmppc_get_gpr(vcpu, 6));
1250 if (ret == H_TOO_HARD)
1253 case H_PUT_TCE_INDIRECT:
1254 ret = kvmppc_h_put_tce_indirect(vcpu, kvmppc_get_gpr(vcpu, 4),
1255 kvmppc_get_gpr(vcpu, 5),
1256 kvmppc_get_gpr(vcpu, 6),
1257 kvmppc_get_gpr(vcpu, 7));
1258 if (ret == H_TOO_HARD)
1262 ret = kvmppc_h_stuff_tce(vcpu, kvmppc_get_gpr(vcpu, 4),
1263 kvmppc_get_gpr(vcpu, 5),
1264 kvmppc_get_gpr(vcpu, 6),
1265 kvmppc_get_gpr(vcpu, 7));
1266 if (ret == H_TOO_HARD)
1271 if (!arch_get_random_seed_longs(&vcpu->arch.regs.gpr[4], 1))
1274 case H_RPT_INVALIDATE:
1275 ret = kvmppc_h_rpt_invalidate(vcpu, kvmppc_get_gpr(vcpu, 4),
1276 kvmppc_get_gpr(vcpu, 5),
1277 kvmppc_get_gpr(vcpu, 6),
1278 kvmppc_get_gpr(vcpu, 7),
1279 kvmppc_get_gpr(vcpu, 8),
1280 kvmppc_get_gpr(vcpu, 9));
1283 case H_SET_PARTITION_TABLE:
1285 if (nesting_enabled(kvm))
1286 ret = kvmhv_set_partition_table(vcpu);
1288 case H_ENTER_NESTED:
1290 if (!nesting_enabled(kvm))
1292 ret = kvmhv_enter_nested_guest(vcpu);
1293 if (ret == H_INTERRUPT) {
1294 kvmppc_set_gpr(vcpu, 3, 0);
1295 vcpu->arch.hcall_needed = 0;
1297 } else if (ret == H_TOO_HARD) {
1298 kvmppc_set_gpr(vcpu, 3, 0);
1299 vcpu->arch.hcall_needed = 0;
1303 case H_TLB_INVALIDATE:
1305 if (nesting_enabled(kvm))
1306 ret = kvmhv_do_nested_tlbie(vcpu);
1308 case H_COPY_TOFROM_GUEST:
1310 if (nesting_enabled(kvm))
1311 ret = kvmhv_copy_tofrom_guest_nested(vcpu);
1314 ret = kvmppc_h_page_init(vcpu, kvmppc_get_gpr(vcpu, 4),
1315 kvmppc_get_gpr(vcpu, 5),
1316 kvmppc_get_gpr(vcpu, 6));
1319 ret = H_UNSUPPORTED;
1320 if (kvmppc_get_srr1(vcpu) & MSR_S)
1321 ret = kvmppc_h_svm_page_in(kvm,
1322 kvmppc_get_gpr(vcpu, 4),
1323 kvmppc_get_gpr(vcpu, 5),
1324 kvmppc_get_gpr(vcpu, 6));
1326 case H_SVM_PAGE_OUT:
1327 ret = H_UNSUPPORTED;
1328 if (kvmppc_get_srr1(vcpu) & MSR_S)
1329 ret = kvmppc_h_svm_page_out(kvm,
1330 kvmppc_get_gpr(vcpu, 4),
1331 kvmppc_get_gpr(vcpu, 5),
1332 kvmppc_get_gpr(vcpu, 6));
1334 case H_SVM_INIT_START:
1335 ret = H_UNSUPPORTED;
1336 if (kvmppc_get_srr1(vcpu) & MSR_S)
1337 ret = kvmppc_h_svm_init_start(kvm);
1339 case H_SVM_INIT_DONE:
1340 ret = H_UNSUPPORTED;
1341 if (kvmppc_get_srr1(vcpu) & MSR_S)
1342 ret = kvmppc_h_svm_init_done(kvm);
1344 case H_SVM_INIT_ABORT:
1346 * Even if that call is made by the Ultravisor, the SSR1 value
1347 * is the guest context one, with the secure bit clear as it has
1348 * not yet been secured. So we can't check it here.
1349 * Instead the kvm->arch.secure_guest flag is checked inside
1350 * kvmppc_h_svm_init_abort().
1352 ret = kvmppc_h_svm_init_abort(kvm);
1358 WARN_ON_ONCE(ret == H_TOO_HARD);
1359 kvmppc_set_gpr(vcpu, 3, ret);
1360 vcpu->arch.hcall_needed = 0;
1361 return RESUME_GUEST;
1365 * Handle H_CEDE in the P9 path where we don't call the real-mode hcall
1366 * handlers in book3s_hv_rmhandlers.S.
1368 * This has to be done early, not in kvmppc_pseries_do_hcall(), so
1369 * that the cede logic in kvmppc_run_single_vcpu() works properly.
1371 static void kvmppc_cede(struct kvm_vcpu *vcpu)
1373 vcpu->arch.shregs.msr |= MSR_EE;
1374 vcpu->arch.ceded = 1;
1376 if (vcpu->arch.prodded) {
1377 vcpu->arch.prodded = 0;
1379 vcpu->arch.ceded = 0;
1383 static int kvmppc_hcall_impl_hv(unsigned long cmd)
1389 case H_REGISTER_VPA:
1391 #ifdef CONFIG_SPAPR_TCE_IOMMU
1394 case H_PUT_TCE_INDIRECT:
1397 case H_LOGICAL_CI_LOAD:
1398 case H_LOGICAL_CI_STORE:
1399 #ifdef CONFIG_KVM_XICS
1408 case H_RPT_INVALIDATE:
1412 /* See if it's in the real-mode table */
1413 return kvmppc_hcall_impl_hv_realmode(cmd);
1416 static int kvmppc_emulate_debug_inst(struct kvm_vcpu *vcpu)
1418 ppc_inst_t last_inst;
1420 if (kvmppc_get_last_inst(vcpu, INST_GENERIC, &last_inst) !=
1423 * Fetch failed, so return to guest and
1424 * try executing it again.
1426 return RESUME_GUEST;
1429 if (ppc_inst_val(last_inst) == KVMPPC_INST_SW_BREAKPOINT) {
1430 vcpu->run->exit_reason = KVM_EXIT_DEBUG;
1431 vcpu->run->debug.arch.address = kvmppc_get_pc(vcpu);
1434 kvmppc_core_queue_program(vcpu, SRR1_PROGILL |
1435 (kvmppc_get_msr(vcpu) & SRR1_PREFIXED));
1436 return RESUME_GUEST;
1440 static void do_nothing(void *x)
1444 static unsigned long kvmppc_read_dpdes(struct kvm_vcpu *vcpu)
1446 int thr, cpu, pcpu, nthreads;
1448 unsigned long dpdes;
1450 nthreads = vcpu->kvm->arch.emul_smt_mode;
1452 cpu = vcpu->vcpu_id & ~(nthreads - 1);
1453 for (thr = 0; thr < nthreads; ++thr, ++cpu) {
1454 v = kvmppc_find_vcpu(vcpu->kvm, cpu);
1458 * If the vcpu is currently running on a physical cpu thread,
1459 * interrupt it in order to pull it out of the guest briefly,
1460 * which will update its vcore->dpdes value.
1462 pcpu = READ_ONCE(v->cpu);
1464 smp_call_function_single(pcpu, do_nothing, NULL, 1);
1465 if (kvmppc_doorbell_pending(v))
1472 * On POWER9, emulate doorbell-related instructions in order to
1473 * give the guest the illusion of running on a multi-threaded core.
1474 * The instructions emulated are msgsndp, msgclrp, mfspr TIR,
1477 static int kvmppc_emulate_doorbell_instr(struct kvm_vcpu *vcpu)
1481 struct kvm *kvm = vcpu->kvm;
1482 struct kvm_vcpu *tvcpu;
1485 if (kvmppc_get_last_inst(vcpu, INST_GENERIC, &pinst) != EMULATE_DONE)
1486 return RESUME_GUEST;
1487 inst = ppc_inst_val(pinst);
1488 if (get_op(inst) != 31)
1489 return EMULATE_FAIL;
1491 thr = vcpu->vcpu_id & (kvm->arch.emul_smt_mode - 1);
1492 switch (get_xop(inst)) {
1493 case OP_31_XOP_MSGSNDP:
1494 arg = kvmppc_get_gpr(vcpu, rb);
1495 if (((arg >> 27) & 0x1f) != PPC_DBELL_SERVER)
1498 if (arg >= kvm->arch.emul_smt_mode)
1500 tvcpu = kvmppc_find_vcpu(kvm, vcpu->vcpu_id - thr + arg);
1503 if (!tvcpu->arch.doorbell_request) {
1504 tvcpu->arch.doorbell_request = 1;
1505 kvmppc_fast_vcpu_kick_hv(tvcpu);
1508 case OP_31_XOP_MSGCLRP:
1509 arg = kvmppc_get_gpr(vcpu, rb);
1510 if (((arg >> 27) & 0x1f) != PPC_DBELL_SERVER)
1512 vcpu->arch.vcore->dpdes = 0;
1513 vcpu->arch.doorbell_request = 0;
1515 case OP_31_XOP_MFSPR:
1516 switch (get_sprn(inst)) {
1521 arg = kvmppc_read_dpdes(vcpu);
1524 return EMULATE_FAIL;
1526 kvmppc_set_gpr(vcpu, get_rt(inst), arg);
1529 return EMULATE_FAIL;
1531 kvmppc_set_pc(vcpu, kvmppc_get_pc(vcpu) + 4);
1532 return RESUME_GUEST;
1536 * If the lppaca had pmcregs_in_use clear when we exited the guest, then
1537 * HFSCR_PM is cleared for next entry. If the guest then tries to access
1538 * the PMU SPRs, we get this facility unavailable interrupt. Putting HFSCR_PM
1539 * back in the guest HFSCR will cause the next entry to load the PMU SPRs and
1540 * allow the guest access to continue.
1542 static int kvmppc_pmu_unavailable(struct kvm_vcpu *vcpu)
1544 if (!(vcpu->arch.hfscr_permitted & HFSCR_PM))
1545 return EMULATE_FAIL;
1547 vcpu->arch.hfscr |= HFSCR_PM;
1549 return RESUME_GUEST;
1552 static int kvmppc_ebb_unavailable(struct kvm_vcpu *vcpu)
1554 if (!(vcpu->arch.hfscr_permitted & HFSCR_EBB))
1555 return EMULATE_FAIL;
1557 vcpu->arch.hfscr |= HFSCR_EBB;
1559 return RESUME_GUEST;
1562 static int kvmppc_tm_unavailable(struct kvm_vcpu *vcpu)
1564 if (!(vcpu->arch.hfscr_permitted & HFSCR_TM))
1565 return EMULATE_FAIL;
1567 vcpu->arch.hfscr |= HFSCR_TM;
1569 return RESUME_GUEST;
1572 static int kvmppc_handle_exit_hv(struct kvm_vcpu *vcpu,
1573 struct task_struct *tsk)
1575 struct kvm_run *run = vcpu->run;
1576 int r = RESUME_HOST;
1578 vcpu->stat.sum_exits++;
1581 * This can happen if an interrupt occurs in the last stages
1582 * of guest entry or the first stages of guest exit (i.e. after
1583 * setting paca->kvm_hstate.in_guest to KVM_GUEST_MODE_GUEST_HV
1584 * and before setting it to KVM_GUEST_MODE_HOST_HV).
1585 * That can happen due to a bug, or due to a machine check
1586 * occurring at just the wrong time.
1588 if (vcpu->arch.shregs.msr & MSR_HV) {
1589 printk(KERN_EMERG "KVM trap in HV mode!\n");
1590 printk(KERN_EMERG "trap=0x%x | pc=0x%lx | msr=0x%llx\n",
1591 vcpu->arch.trap, kvmppc_get_pc(vcpu),
1592 vcpu->arch.shregs.msr);
1593 kvmppc_dump_regs(vcpu);
1594 run->exit_reason = KVM_EXIT_INTERNAL_ERROR;
1595 run->hw.hardware_exit_reason = vcpu->arch.trap;
1598 run->exit_reason = KVM_EXIT_UNKNOWN;
1599 run->ready_for_interrupt_injection = 1;
1600 switch (vcpu->arch.trap) {
1601 /* We're good on these - the host merely wanted to get our attention */
1602 case BOOK3S_INTERRUPT_NESTED_HV_DECREMENTER:
1603 WARN_ON_ONCE(1); /* Should never happen */
1604 vcpu->arch.trap = BOOK3S_INTERRUPT_HV_DECREMENTER;
1606 case BOOK3S_INTERRUPT_HV_DECREMENTER:
1607 vcpu->stat.dec_exits++;
1610 case BOOK3S_INTERRUPT_EXTERNAL:
1611 case BOOK3S_INTERRUPT_H_DOORBELL:
1612 case BOOK3S_INTERRUPT_H_VIRT:
1613 vcpu->stat.ext_intr_exits++;
1616 /* SR/HMI/PMI are HV interrupts that host has handled. Resume guest.*/
1617 case BOOK3S_INTERRUPT_HMI:
1618 case BOOK3S_INTERRUPT_PERFMON:
1619 case BOOK3S_INTERRUPT_SYSTEM_RESET:
1622 case BOOK3S_INTERRUPT_MACHINE_CHECK: {
1623 static DEFINE_RATELIMIT_STATE(rs, DEFAULT_RATELIMIT_INTERVAL,
1624 DEFAULT_RATELIMIT_BURST);
1626 * Print the MCE event to host console. Ratelimit so the guest
1627 * can't flood the host log.
1629 if (__ratelimit(&rs))
1630 machine_check_print_event_info(&vcpu->arch.mce_evt,false, true);
1633 * If the guest can do FWNMI, exit to userspace so it can
1634 * deliver a FWNMI to the guest.
1635 * Otherwise we synthesize a machine check for the guest
1636 * so that it knows that the machine check occurred.
1638 if (!vcpu->kvm->arch.fwnmi_enabled) {
1639 ulong flags = (vcpu->arch.shregs.msr & 0x083c0000) |
1640 (kvmppc_get_msr(vcpu) & SRR1_PREFIXED);
1641 kvmppc_core_queue_machine_check(vcpu, flags);
1646 /* Exit to guest with KVM_EXIT_NMI as exit reason */
1647 run->exit_reason = KVM_EXIT_NMI;
1648 run->hw.hardware_exit_reason = vcpu->arch.trap;
1649 /* Clear out the old NMI status from run->flags */
1650 run->flags &= ~KVM_RUN_PPC_NMI_DISP_MASK;
1651 /* Now set the NMI status */
1652 if (vcpu->arch.mce_evt.disposition == MCE_DISPOSITION_RECOVERED)
1653 run->flags |= KVM_RUN_PPC_NMI_DISP_FULLY_RECOV;
1655 run->flags |= KVM_RUN_PPC_NMI_DISP_NOT_RECOV;
1660 case BOOK3S_INTERRUPT_PROGRAM:
1664 * Normally program interrupts are delivered directly
1665 * to the guest by the hardware, but we can get here
1666 * as a result of a hypervisor emulation interrupt
1667 * (e40) getting turned into a 700 by BML RTAS.
1669 flags = (vcpu->arch.shregs.msr & 0x1f0000ull) |
1670 (kvmppc_get_msr(vcpu) & SRR1_PREFIXED);
1671 kvmppc_core_queue_program(vcpu, flags);
1675 case BOOK3S_INTERRUPT_SYSCALL:
1679 if (unlikely(vcpu->arch.shregs.msr & MSR_PR)) {
1681 * Guest userspace executed sc 1. This can only be
1682 * reached by the P9 path because the old path
1683 * handles this case in realmode hcall handlers.
1685 if (!kvmhv_vcpu_is_radix(vcpu)) {
1687 * A guest could be running PR KVM, so this
1688 * may be a PR KVM hcall. It must be reflected
1689 * to the guest kernel as a sc interrupt.
1691 kvmppc_core_queue_syscall(vcpu);
1694 * Radix guests can not run PR KVM or nested HV
1695 * hash guests which might run PR KVM, so this
1696 * is always a privilege fault. Send a program
1697 * check to guest kernel.
1699 kvmppc_core_queue_program(vcpu, SRR1_PROGPRIV);
1706 * hcall - gather args and set exit_reason. This will next be
1707 * handled by kvmppc_pseries_do_hcall which may be able to deal
1708 * with it and resume guest, or may punt to userspace.
1710 run->papr_hcall.nr = kvmppc_get_gpr(vcpu, 3);
1711 for (i = 0; i < 9; ++i)
1712 run->papr_hcall.args[i] = kvmppc_get_gpr(vcpu, 4 + i);
1713 run->exit_reason = KVM_EXIT_PAPR_HCALL;
1714 vcpu->arch.hcall_needed = 1;
1719 * We get these next two if the guest accesses a page which it thinks
1720 * it has mapped but which is not actually present, either because
1721 * it is for an emulated I/O device or because the corresonding
1722 * host page has been paged out.
1724 * Any other HDSI/HISI interrupts have been handled already for P7/8
1725 * guests. For POWER9 hash guests not using rmhandlers, basic hash
1726 * fault handling is done here.
1728 case BOOK3S_INTERRUPT_H_DATA_STORAGE: {
1732 if (cpu_has_feature(CPU_FTR_P9_RADIX_PREFETCH_BUG) &&
1733 unlikely(vcpu->arch.fault_dsisr == HDSISR_CANARY)) {
1734 r = RESUME_GUEST; /* Just retry if it's the canary */
1738 if (kvm_is_radix(vcpu->kvm) || !cpu_has_feature(CPU_FTR_ARCH_300)) {
1740 * Radix doesn't require anything, and pre-ISAv3.0 hash
1741 * already attempted to handle this in rmhandlers. The
1742 * hash fault handling below is v3 only (it uses ASDR
1745 r = RESUME_PAGE_FAULT;
1749 if (!(vcpu->arch.fault_dsisr & (DSISR_NOHPTE | DSISR_PROTFAULT))) {
1750 kvmppc_core_queue_data_storage(vcpu,
1751 kvmppc_get_msr(vcpu) & SRR1_PREFIXED,
1752 vcpu->arch.fault_dar, vcpu->arch.fault_dsisr);
1757 if (!(vcpu->arch.shregs.msr & MSR_DR))
1758 vsid = vcpu->kvm->arch.vrma_slb_v;
1760 vsid = vcpu->arch.fault_gpa;
1762 err = kvmppc_hpte_hv_fault(vcpu, vcpu->arch.fault_dar,
1763 vsid, vcpu->arch.fault_dsisr, true);
1766 } else if (err == -1 || err == -2) {
1767 r = RESUME_PAGE_FAULT;
1769 kvmppc_core_queue_data_storage(vcpu,
1770 kvmppc_get_msr(vcpu) & SRR1_PREFIXED,
1771 vcpu->arch.fault_dar, err);
1776 case BOOK3S_INTERRUPT_H_INST_STORAGE: {
1780 vcpu->arch.fault_dar = kvmppc_get_pc(vcpu);
1781 vcpu->arch.fault_dsisr = vcpu->arch.shregs.msr &
1782 DSISR_SRR1_MATCH_64S;
1783 if (kvm_is_radix(vcpu->kvm) || !cpu_has_feature(CPU_FTR_ARCH_300)) {
1785 * Radix doesn't require anything, and pre-ISAv3.0 hash
1786 * already attempted to handle this in rmhandlers. The
1787 * hash fault handling below is v3 only (it uses ASDR
1790 if (vcpu->arch.shregs.msr & HSRR1_HISI_WRITE)
1791 vcpu->arch.fault_dsisr |= DSISR_ISSTORE;
1792 r = RESUME_PAGE_FAULT;
1796 if (!(vcpu->arch.fault_dsisr & SRR1_ISI_NOPT)) {
1797 kvmppc_core_queue_inst_storage(vcpu,
1798 vcpu->arch.fault_dsisr |
1799 (kvmppc_get_msr(vcpu) & SRR1_PREFIXED));
1804 if (!(vcpu->arch.shregs.msr & MSR_IR))
1805 vsid = vcpu->kvm->arch.vrma_slb_v;
1807 vsid = vcpu->arch.fault_gpa;
1809 err = kvmppc_hpte_hv_fault(vcpu, vcpu->arch.fault_dar,
1810 vsid, vcpu->arch.fault_dsisr, false);
1813 } else if (err == -1) {
1814 r = RESUME_PAGE_FAULT;
1816 kvmppc_core_queue_inst_storage(vcpu,
1817 err | (kvmppc_get_msr(vcpu) & SRR1_PREFIXED));
1824 * This occurs if the guest executes an illegal instruction.
1825 * If the guest debug is disabled, generate a program interrupt
1826 * to the guest. If guest debug is enabled, we need to check
1827 * whether the instruction is a software breakpoint instruction.
1828 * Accordingly return to Guest or Host.
1830 case BOOK3S_INTERRUPT_H_EMUL_ASSIST:
1831 if (vcpu->arch.emul_inst != KVM_INST_FETCH_FAILED)
1832 vcpu->arch.last_inst = kvmppc_need_byteswap(vcpu) ?
1833 swab32(vcpu->arch.emul_inst) :
1834 vcpu->arch.emul_inst;
1835 if (vcpu->guest_debug & KVM_GUESTDBG_USE_SW_BP) {
1836 r = kvmppc_emulate_debug_inst(vcpu);
1838 kvmppc_core_queue_program(vcpu, SRR1_PROGILL |
1839 (kvmppc_get_msr(vcpu) & SRR1_PREFIXED));
1844 #ifdef CONFIG_PPC_TRANSACTIONAL_MEM
1845 case BOOK3S_INTERRUPT_HV_SOFTPATCH:
1847 * This occurs for various TM-related instructions that
1848 * we need to emulate on POWER9 DD2.2. We have already
1849 * handled the cases where the guest was in real-suspend
1850 * mode and was transitioning to transactional state.
1852 r = kvmhv_p9_tm_emulation(vcpu);
1855 fallthrough; /* go to facility unavailable handler */
1859 * This occurs if the guest (kernel or userspace), does something that
1860 * is prohibited by HFSCR.
1861 * On POWER9, this could be a doorbell instruction that we need
1863 * Otherwise, we just generate a program interrupt to the guest.
1865 case BOOK3S_INTERRUPT_H_FAC_UNAVAIL: {
1866 u64 cause = vcpu->arch.hfscr >> 56;
1869 if (cpu_has_feature(CPU_FTR_ARCH_300)) {
1870 if (cause == FSCR_MSGP_LG)
1871 r = kvmppc_emulate_doorbell_instr(vcpu);
1872 if (cause == FSCR_PM_LG)
1873 r = kvmppc_pmu_unavailable(vcpu);
1874 if (cause == FSCR_EBB_LG)
1875 r = kvmppc_ebb_unavailable(vcpu);
1876 if (cause == FSCR_TM_LG)
1877 r = kvmppc_tm_unavailable(vcpu);
1879 if (r == EMULATE_FAIL) {
1880 kvmppc_core_queue_program(vcpu, SRR1_PROGILL |
1881 (kvmppc_get_msr(vcpu) & SRR1_PREFIXED));
1887 case BOOK3S_INTERRUPT_HV_RM_HARD:
1888 r = RESUME_PASSTHROUGH;
1891 kvmppc_dump_regs(vcpu);
1892 printk(KERN_EMERG "trap=0x%x | pc=0x%lx | msr=0x%llx\n",
1893 vcpu->arch.trap, kvmppc_get_pc(vcpu),
1894 vcpu->arch.shregs.msr);
1895 run->hw.hardware_exit_reason = vcpu->arch.trap;
1903 static int kvmppc_handle_nested_exit(struct kvm_vcpu *vcpu)
1908 vcpu->stat.sum_exits++;
1911 * This can happen if an interrupt occurs in the last stages
1912 * of guest entry or the first stages of guest exit (i.e. after
1913 * setting paca->kvm_hstate.in_guest to KVM_GUEST_MODE_GUEST_HV
1914 * and before setting it to KVM_GUEST_MODE_HOST_HV).
1915 * That can happen due to a bug, or due to a machine check
1916 * occurring at just the wrong time.
1918 if (vcpu->arch.shregs.msr & MSR_HV) {
1919 pr_emerg("KVM trap in HV mode while nested!\n");
1920 pr_emerg("trap=0x%x | pc=0x%lx | msr=0x%llx\n",
1921 vcpu->arch.trap, kvmppc_get_pc(vcpu),
1922 vcpu->arch.shregs.msr);
1923 kvmppc_dump_regs(vcpu);
1926 switch (vcpu->arch.trap) {
1927 /* We're good on these - the host merely wanted to get our attention */
1928 case BOOK3S_INTERRUPT_HV_DECREMENTER:
1929 vcpu->stat.dec_exits++;
1932 case BOOK3S_INTERRUPT_EXTERNAL:
1933 vcpu->stat.ext_intr_exits++;
1936 case BOOK3S_INTERRUPT_H_DOORBELL:
1937 case BOOK3S_INTERRUPT_H_VIRT:
1938 vcpu->stat.ext_intr_exits++;
1941 /* These need to go to the nested HV */
1942 case BOOK3S_INTERRUPT_NESTED_HV_DECREMENTER:
1943 vcpu->arch.trap = BOOK3S_INTERRUPT_HV_DECREMENTER;
1944 vcpu->stat.dec_exits++;
1947 /* SR/HMI/PMI are HV interrupts that host has handled. Resume guest.*/
1948 case BOOK3S_INTERRUPT_HMI:
1949 case BOOK3S_INTERRUPT_PERFMON:
1950 case BOOK3S_INTERRUPT_SYSTEM_RESET:
1953 case BOOK3S_INTERRUPT_MACHINE_CHECK:
1955 static DEFINE_RATELIMIT_STATE(rs, DEFAULT_RATELIMIT_INTERVAL,
1956 DEFAULT_RATELIMIT_BURST);
1957 /* Pass the machine check to the L1 guest */
1959 /* Print the MCE event to host console. */
1960 if (__ratelimit(&rs))
1961 machine_check_print_event_info(&vcpu->arch.mce_evt, false, true);
1965 * We get these next two if the guest accesses a page which it thinks
1966 * it has mapped but which is not actually present, either because
1967 * it is for an emulated I/O device or because the corresonding
1968 * host page has been paged out.
1970 case BOOK3S_INTERRUPT_H_DATA_STORAGE:
1971 srcu_idx = srcu_read_lock(&vcpu->kvm->srcu);
1972 r = kvmhv_nested_page_fault(vcpu);
1973 srcu_read_unlock(&vcpu->kvm->srcu, srcu_idx);
1975 case BOOK3S_INTERRUPT_H_INST_STORAGE:
1976 vcpu->arch.fault_dar = kvmppc_get_pc(vcpu);
1977 vcpu->arch.fault_dsisr = kvmppc_get_msr(vcpu) &
1978 DSISR_SRR1_MATCH_64S;
1979 if (vcpu->arch.shregs.msr & HSRR1_HISI_WRITE)
1980 vcpu->arch.fault_dsisr |= DSISR_ISSTORE;
1981 srcu_idx = srcu_read_lock(&vcpu->kvm->srcu);
1982 r = kvmhv_nested_page_fault(vcpu);
1983 srcu_read_unlock(&vcpu->kvm->srcu, srcu_idx);
1986 #ifdef CONFIG_PPC_TRANSACTIONAL_MEM
1987 case BOOK3S_INTERRUPT_HV_SOFTPATCH:
1989 * This occurs for various TM-related instructions that
1990 * we need to emulate on POWER9 DD2.2. We have already
1991 * handled the cases where the guest was in real-suspend
1992 * mode and was transitioning to transactional state.
1994 r = kvmhv_p9_tm_emulation(vcpu);
1997 fallthrough; /* go to facility unavailable handler */
2000 case BOOK3S_INTERRUPT_H_FAC_UNAVAIL: {
2001 u64 cause = vcpu->arch.hfscr >> 56;
2004 * Only pass HFU interrupts to the L1 if the facility is
2005 * permitted but disabled by the L1's HFSCR, otherwise
2006 * the interrupt does not make sense to the L1 so turn
2009 if (!(vcpu->arch.hfscr_permitted & (1UL << cause)) ||
2010 (vcpu->arch.nested_hfscr & (1UL << cause))) {
2012 vcpu->arch.trap = BOOK3S_INTERRUPT_H_EMUL_ASSIST;
2015 * If the fetch failed, return to guest and
2016 * try executing it again.
2018 r = kvmppc_get_last_inst(vcpu, INST_GENERIC, &pinst);
2019 vcpu->arch.emul_inst = ppc_inst_val(pinst);
2020 if (r != EMULATE_DONE)
2031 case BOOK3S_INTERRUPT_HV_RM_HARD:
2032 vcpu->arch.trap = 0;
2034 if (!xics_on_xive())
2035 kvmppc_xics_rm_complete(vcpu, 0);
2037 case BOOK3S_INTERRUPT_SYSCALL:
2039 unsigned long req = kvmppc_get_gpr(vcpu, 3);
2042 * The H_RPT_INVALIDATE hcalls issued by nested
2043 * guests for process-scoped invalidations when
2044 * GTSE=0, are handled here in L0.
2046 if (req == H_RPT_INVALIDATE) {
2047 r = kvmppc_nested_h_rpt_invalidate(vcpu);
2062 static int kvm_arch_vcpu_ioctl_get_sregs_hv(struct kvm_vcpu *vcpu,
2063 struct kvm_sregs *sregs)
2067 memset(sregs, 0, sizeof(struct kvm_sregs));
2068 sregs->pvr = vcpu->arch.pvr;
2069 for (i = 0; i < vcpu->arch.slb_max; i++) {
2070 sregs->u.s.ppc64.slb[i].slbe = vcpu->arch.slb[i].orige;
2071 sregs->u.s.ppc64.slb[i].slbv = vcpu->arch.slb[i].origv;
2077 static int kvm_arch_vcpu_ioctl_set_sregs_hv(struct kvm_vcpu *vcpu,
2078 struct kvm_sregs *sregs)
2082 /* Only accept the same PVR as the host's, since we can't spoof it */
2083 if (sregs->pvr != vcpu->arch.pvr)
2087 for (i = 0; i < vcpu->arch.slb_nr; i++) {
2088 if (sregs->u.s.ppc64.slb[i].slbe & SLB_ESID_V) {
2089 vcpu->arch.slb[j].orige = sregs->u.s.ppc64.slb[i].slbe;
2090 vcpu->arch.slb[j].origv = sregs->u.s.ppc64.slb[i].slbv;
2094 vcpu->arch.slb_max = j;
2100 * Enforce limits on guest LPCR values based on hardware availability,
2101 * guest configuration, and possibly hypervisor support and security
2104 unsigned long kvmppc_filter_lpcr_hv(struct kvm *kvm, unsigned long lpcr)
2106 /* LPCR_TC only applies to HPT guests */
2107 if (kvm_is_radix(kvm))
2110 /* On POWER8 and above, userspace can modify AIL */
2111 if (!cpu_has_feature(CPU_FTR_ARCH_207S))
2113 if ((lpcr & LPCR_AIL) != LPCR_AIL_3)
2114 lpcr &= ~LPCR_AIL; /* LPCR[AIL]=1/2 is disallowed */
2116 * On some POWER9s we force AIL off for radix guests to prevent
2117 * executing in MSR[HV]=1 mode with the MMU enabled and PIDR set to
2118 * guest, which can result in Q0 translations with LPID=0 PID=PIDR to
2119 * be cached, which the host TLB management does not expect.
2121 if (kvm_is_radix(kvm) && cpu_has_feature(CPU_FTR_P9_RADIX_PREFETCH_BUG))
2125 * On POWER9, allow userspace to enable large decrementer for the
2126 * guest, whether or not the host has it enabled.
2128 if (!cpu_has_feature(CPU_FTR_ARCH_300))
2134 static void verify_lpcr(struct kvm *kvm, unsigned long lpcr)
2136 if (lpcr != kvmppc_filter_lpcr_hv(kvm, lpcr)) {
2137 WARN_ONCE(1, "lpcr 0x%lx differs from filtered 0x%lx\n",
2138 lpcr, kvmppc_filter_lpcr_hv(kvm, lpcr));
2142 static void kvmppc_set_lpcr(struct kvm_vcpu *vcpu, u64 new_lpcr,
2143 bool preserve_top32)
2145 struct kvm *kvm = vcpu->kvm;
2146 struct kvmppc_vcore *vc = vcpu->arch.vcore;
2149 spin_lock(&vc->lock);
2152 * Userspace can only modify
2153 * DPFD (default prefetch depth), ILE (interrupt little-endian),
2154 * TC (translation control), AIL (alternate interrupt location),
2155 * LD (large decrementer).
2156 * These are subject to restrictions from kvmppc_filter_lcpr_hv().
2158 mask = LPCR_DPFD | LPCR_ILE | LPCR_TC | LPCR_AIL | LPCR_LD;
2160 /* Broken 32-bit version of LPCR must not clear top bits */
2164 new_lpcr = kvmppc_filter_lpcr_hv(kvm,
2165 (vc->lpcr & ~mask) | (new_lpcr & mask));
2168 * If ILE (interrupt little-endian) has changed, update the
2169 * MSR_LE bit in the intr_msr for each vcpu in this vcore.
2171 if ((new_lpcr & LPCR_ILE) != (vc->lpcr & LPCR_ILE)) {
2172 struct kvm_vcpu *vcpu;
2175 kvm_for_each_vcpu(i, vcpu, kvm) {
2176 if (vcpu->arch.vcore != vc)
2178 if (new_lpcr & LPCR_ILE)
2179 vcpu->arch.intr_msr |= MSR_LE;
2181 vcpu->arch.intr_msr &= ~MSR_LE;
2185 vc->lpcr = new_lpcr;
2187 spin_unlock(&vc->lock);
2190 static int kvmppc_get_one_reg_hv(struct kvm_vcpu *vcpu, u64 id,
2191 union kvmppc_one_reg *val)
2197 case KVM_REG_PPC_DEBUG_INST:
2198 *val = get_reg_val(id, KVMPPC_INST_SW_BREAKPOINT);
2200 case KVM_REG_PPC_HIOR:
2201 *val = get_reg_val(id, 0);
2203 case KVM_REG_PPC_DABR:
2204 *val = get_reg_val(id, vcpu->arch.dabr);
2206 case KVM_REG_PPC_DABRX:
2207 *val = get_reg_val(id, vcpu->arch.dabrx);
2209 case KVM_REG_PPC_DSCR:
2210 *val = get_reg_val(id, vcpu->arch.dscr);
2212 case KVM_REG_PPC_PURR:
2213 *val = get_reg_val(id, vcpu->arch.purr);
2215 case KVM_REG_PPC_SPURR:
2216 *val = get_reg_val(id, vcpu->arch.spurr);
2218 case KVM_REG_PPC_AMR:
2219 *val = get_reg_val(id, vcpu->arch.amr);
2221 case KVM_REG_PPC_UAMOR:
2222 *val = get_reg_val(id, vcpu->arch.uamor);
2224 case KVM_REG_PPC_MMCR0 ... KVM_REG_PPC_MMCR1:
2225 i = id - KVM_REG_PPC_MMCR0;
2226 *val = get_reg_val(id, vcpu->arch.mmcr[i]);
2228 case KVM_REG_PPC_MMCR2:
2229 *val = get_reg_val(id, vcpu->arch.mmcr[2]);
2231 case KVM_REG_PPC_MMCRA:
2232 *val = get_reg_val(id, vcpu->arch.mmcra);
2234 case KVM_REG_PPC_MMCRS:
2235 *val = get_reg_val(id, vcpu->arch.mmcrs);
2237 case KVM_REG_PPC_MMCR3:
2238 *val = get_reg_val(id, vcpu->arch.mmcr[3]);
2240 case KVM_REG_PPC_PMC1 ... KVM_REG_PPC_PMC8:
2241 i = id - KVM_REG_PPC_PMC1;
2242 *val = get_reg_val(id, vcpu->arch.pmc[i]);
2244 case KVM_REG_PPC_SPMC1 ... KVM_REG_PPC_SPMC2:
2245 i = id - KVM_REG_PPC_SPMC1;
2246 *val = get_reg_val(id, vcpu->arch.spmc[i]);
2248 case KVM_REG_PPC_SIAR:
2249 *val = get_reg_val(id, vcpu->arch.siar);
2251 case KVM_REG_PPC_SDAR:
2252 *val = get_reg_val(id, vcpu->arch.sdar);
2254 case KVM_REG_PPC_SIER:
2255 *val = get_reg_val(id, vcpu->arch.sier[0]);
2257 case KVM_REG_PPC_SIER2:
2258 *val = get_reg_val(id, vcpu->arch.sier[1]);
2260 case KVM_REG_PPC_SIER3:
2261 *val = get_reg_val(id, vcpu->arch.sier[2]);
2263 case KVM_REG_PPC_IAMR:
2264 *val = get_reg_val(id, vcpu->arch.iamr);
2266 case KVM_REG_PPC_PSPB:
2267 *val = get_reg_val(id, vcpu->arch.pspb);
2269 case KVM_REG_PPC_DPDES:
2271 * On POWER9, where we are emulating msgsndp etc.,
2272 * we return 1 bit for each vcpu, which can come from
2273 * either vcore->dpdes or doorbell_request.
2274 * On POWER8, doorbell_request is 0.
2276 if (cpu_has_feature(CPU_FTR_ARCH_300))
2277 *val = get_reg_val(id, vcpu->arch.doorbell_request);
2279 *val = get_reg_val(id, vcpu->arch.vcore->dpdes);
2281 case KVM_REG_PPC_VTB:
2282 *val = get_reg_val(id, vcpu->arch.vcore->vtb);
2284 case KVM_REG_PPC_DAWR:
2285 *val = get_reg_val(id, vcpu->arch.dawr0);
2287 case KVM_REG_PPC_DAWRX:
2288 *val = get_reg_val(id, vcpu->arch.dawrx0);
2290 case KVM_REG_PPC_DAWR1:
2291 *val = get_reg_val(id, vcpu->arch.dawr1);
2293 case KVM_REG_PPC_DAWRX1:
2294 *val = get_reg_val(id, vcpu->arch.dawrx1);
2296 case KVM_REG_PPC_CIABR:
2297 *val = get_reg_val(id, vcpu->arch.ciabr);
2299 case KVM_REG_PPC_CSIGR:
2300 *val = get_reg_val(id, vcpu->arch.csigr);
2302 case KVM_REG_PPC_TACR:
2303 *val = get_reg_val(id, vcpu->arch.tacr);
2305 case KVM_REG_PPC_TCSCR:
2306 *val = get_reg_val(id, vcpu->arch.tcscr);
2308 case KVM_REG_PPC_PID:
2309 *val = get_reg_val(id, vcpu->arch.pid);
2311 case KVM_REG_PPC_ACOP:
2312 *val = get_reg_val(id, vcpu->arch.acop);
2314 case KVM_REG_PPC_WORT:
2315 *val = get_reg_val(id, vcpu->arch.wort);
2317 case KVM_REG_PPC_TIDR:
2318 *val = get_reg_val(id, vcpu->arch.tid);
2320 case KVM_REG_PPC_PSSCR:
2321 *val = get_reg_val(id, vcpu->arch.psscr);
2323 case KVM_REG_PPC_VPA_ADDR:
2324 spin_lock(&vcpu->arch.vpa_update_lock);
2325 *val = get_reg_val(id, vcpu->arch.vpa.next_gpa);
2326 spin_unlock(&vcpu->arch.vpa_update_lock);
2328 case KVM_REG_PPC_VPA_SLB:
2329 spin_lock(&vcpu->arch.vpa_update_lock);
2330 val->vpaval.addr = vcpu->arch.slb_shadow.next_gpa;
2331 val->vpaval.length = vcpu->arch.slb_shadow.len;
2332 spin_unlock(&vcpu->arch.vpa_update_lock);
2334 case KVM_REG_PPC_VPA_DTL:
2335 spin_lock(&vcpu->arch.vpa_update_lock);
2336 val->vpaval.addr = vcpu->arch.dtl.next_gpa;
2337 val->vpaval.length = vcpu->arch.dtl.len;
2338 spin_unlock(&vcpu->arch.vpa_update_lock);
2340 case KVM_REG_PPC_TB_OFFSET:
2341 *val = get_reg_val(id, vcpu->arch.vcore->tb_offset);
2343 case KVM_REG_PPC_LPCR:
2344 case KVM_REG_PPC_LPCR_64:
2345 *val = get_reg_val(id, vcpu->arch.vcore->lpcr);
2347 case KVM_REG_PPC_PPR:
2348 *val = get_reg_val(id, vcpu->arch.ppr);
2350 #ifdef CONFIG_PPC_TRANSACTIONAL_MEM
2351 case KVM_REG_PPC_TFHAR:
2352 *val = get_reg_val(id, vcpu->arch.tfhar);
2354 case KVM_REG_PPC_TFIAR:
2355 *val = get_reg_val(id, vcpu->arch.tfiar);
2357 case KVM_REG_PPC_TEXASR:
2358 *val = get_reg_val(id, vcpu->arch.texasr);
2360 case KVM_REG_PPC_TM_GPR0 ... KVM_REG_PPC_TM_GPR31:
2361 i = id - KVM_REG_PPC_TM_GPR0;
2362 *val = get_reg_val(id, vcpu->arch.gpr_tm[i]);
2364 case KVM_REG_PPC_TM_VSR0 ... KVM_REG_PPC_TM_VSR63:
2367 i = id - KVM_REG_PPC_TM_VSR0;
2369 for (j = 0; j < TS_FPRWIDTH; j++)
2370 val->vsxval[j] = vcpu->arch.fp_tm.fpr[i][j];
2372 if (cpu_has_feature(CPU_FTR_ALTIVEC))
2373 val->vval = vcpu->arch.vr_tm.vr[i-32];
2379 case KVM_REG_PPC_TM_CR:
2380 *val = get_reg_val(id, vcpu->arch.cr_tm);
2382 case KVM_REG_PPC_TM_XER:
2383 *val = get_reg_val(id, vcpu->arch.xer_tm);
2385 case KVM_REG_PPC_TM_LR:
2386 *val = get_reg_val(id, vcpu->arch.lr_tm);
2388 case KVM_REG_PPC_TM_CTR:
2389 *val = get_reg_val(id, vcpu->arch.ctr_tm);
2391 case KVM_REG_PPC_TM_FPSCR:
2392 *val = get_reg_val(id, vcpu->arch.fp_tm.fpscr);
2394 case KVM_REG_PPC_TM_AMR:
2395 *val = get_reg_val(id, vcpu->arch.amr_tm);
2397 case KVM_REG_PPC_TM_PPR:
2398 *val = get_reg_val(id, vcpu->arch.ppr_tm);
2400 case KVM_REG_PPC_TM_VRSAVE:
2401 *val = get_reg_val(id, vcpu->arch.vrsave_tm);
2403 case KVM_REG_PPC_TM_VSCR:
2404 if (cpu_has_feature(CPU_FTR_ALTIVEC))
2405 *val = get_reg_val(id, vcpu->arch.vr_tm.vscr.u[3]);
2409 case KVM_REG_PPC_TM_DSCR:
2410 *val = get_reg_val(id, vcpu->arch.dscr_tm);
2412 case KVM_REG_PPC_TM_TAR:
2413 *val = get_reg_val(id, vcpu->arch.tar_tm);
2416 case KVM_REG_PPC_ARCH_COMPAT:
2417 *val = get_reg_val(id, vcpu->arch.vcore->arch_compat);
2419 case KVM_REG_PPC_DEC_EXPIRY:
2420 *val = get_reg_val(id, vcpu->arch.dec_expires);
2422 case KVM_REG_PPC_ONLINE:
2423 *val = get_reg_val(id, vcpu->arch.online);
2425 case KVM_REG_PPC_PTCR:
2426 *val = get_reg_val(id, vcpu->kvm->arch.l1_ptcr);
2436 static int kvmppc_set_one_reg_hv(struct kvm_vcpu *vcpu, u64 id,
2437 union kvmppc_one_reg *val)
2441 unsigned long addr, len;
2444 case KVM_REG_PPC_HIOR:
2445 /* Only allow this to be set to zero */
2446 if (set_reg_val(id, *val))
2449 case KVM_REG_PPC_DABR:
2450 vcpu->arch.dabr = set_reg_val(id, *val);
2452 case KVM_REG_PPC_DABRX:
2453 vcpu->arch.dabrx = set_reg_val(id, *val) & ~DABRX_HYP;
2455 case KVM_REG_PPC_DSCR:
2456 vcpu->arch.dscr = set_reg_val(id, *val);
2458 case KVM_REG_PPC_PURR:
2459 vcpu->arch.purr = set_reg_val(id, *val);
2461 case KVM_REG_PPC_SPURR:
2462 vcpu->arch.spurr = set_reg_val(id, *val);
2464 case KVM_REG_PPC_AMR:
2465 vcpu->arch.amr = set_reg_val(id, *val);
2467 case KVM_REG_PPC_UAMOR:
2468 vcpu->arch.uamor = set_reg_val(id, *val);
2470 case KVM_REG_PPC_MMCR0 ... KVM_REG_PPC_MMCR1:
2471 i = id - KVM_REG_PPC_MMCR0;
2472 vcpu->arch.mmcr[i] = set_reg_val(id, *val);
2474 case KVM_REG_PPC_MMCR2:
2475 vcpu->arch.mmcr[2] = set_reg_val(id, *val);
2477 case KVM_REG_PPC_MMCRA:
2478 vcpu->arch.mmcra = set_reg_val(id, *val);
2480 case KVM_REG_PPC_MMCRS:
2481 vcpu->arch.mmcrs = set_reg_val(id, *val);
2483 case KVM_REG_PPC_MMCR3:
2484 *val = get_reg_val(id, vcpu->arch.mmcr[3]);
2486 case KVM_REG_PPC_PMC1 ... KVM_REG_PPC_PMC8:
2487 i = id - KVM_REG_PPC_PMC1;
2488 vcpu->arch.pmc[i] = set_reg_val(id, *val);
2490 case KVM_REG_PPC_SPMC1 ... KVM_REG_PPC_SPMC2:
2491 i = id - KVM_REG_PPC_SPMC1;
2492 vcpu->arch.spmc[i] = set_reg_val(id, *val);
2494 case KVM_REG_PPC_SIAR:
2495 vcpu->arch.siar = set_reg_val(id, *val);
2497 case KVM_REG_PPC_SDAR:
2498 vcpu->arch.sdar = set_reg_val(id, *val);
2500 case KVM_REG_PPC_SIER:
2501 vcpu->arch.sier[0] = set_reg_val(id, *val);
2503 case KVM_REG_PPC_SIER2:
2504 vcpu->arch.sier[1] = set_reg_val(id, *val);
2506 case KVM_REG_PPC_SIER3:
2507 vcpu->arch.sier[2] = set_reg_val(id, *val);
2509 case KVM_REG_PPC_IAMR:
2510 vcpu->arch.iamr = set_reg_val(id, *val);
2512 case KVM_REG_PPC_PSPB:
2513 vcpu->arch.pspb = set_reg_val(id, *val);
2515 case KVM_REG_PPC_DPDES:
2516 if (cpu_has_feature(CPU_FTR_ARCH_300))
2517 vcpu->arch.doorbell_request = set_reg_val(id, *val) & 1;
2519 vcpu->arch.vcore->dpdes = set_reg_val(id, *val);
2521 case KVM_REG_PPC_VTB:
2522 vcpu->arch.vcore->vtb = set_reg_val(id, *val);
2524 case KVM_REG_PPC_DAWR:
2525 vcpu->arch.dawr0 = set_reg_val(id, *val);
2527 case KVM_REG_PPC_DAWRX:
2528 vcpu->arch.dawrx0 = set_reg_val(id, *val) & ~DAWRX_HYP;
2530 case KVM_REG_PPC_DAWR1:
2531 vcpu->arch.dawr1 = set_reg_val(id, *val);
2533 case KVM_REG_PPC_DAWRX1:
2534 vcpu->arch.dawrx1 = set_reg_val(id, *val) & ~DAWRX_HYP;
2536 case KVM_REG_PPC_CIABR:
2537 vcpu->arch.ciabr = set_reg_val(id, *val);
2538 /* Don't allow setting breakpoints in hypervisor code */
2539 if ((vcpu->arch.ciabr & CIABR_PRIV) == CIABR_PRIV_HYPER)
2540 vcpu->arch.ciabr &= ~CIABR_PRIV; /* disable */
2542 case KVM_REG_PPC_CSIGR:
2543 vcpu->arch.csigr = set_reg_val(id, *val);
2545 case KVM_REG_PPC_TACR:
2546 vcpu->arch.tacr = set_reg_val(id, *val);
2548 case KVM_REG_PPC_TCSCR:
2549 vcpu->arch.tcscr = set_reg_val(id, *val);
2551 case KVM_REG_PPC_PID:
2552 vcpu->arch.pid = set_reg_val(id, *val);
2554 case KVM_REG_PPC_ACOP:
2555 vcpu->arch.acop = set_reg_val(id, *val);
2557 case KVM_REG_PPC_WORT:
2558 vcpu->arch.wort = set_reg_val(id, *val);
2560 case KVM_REG_PPC_TIDR:
2561 vcpu->arch.tid = set_reg_val(id, *val);
2563 case KVM_REG_PPC_PSSCR:
2564 vcpu->arch.psscr = set_reg_val(id, *val) & PSSCR_GUEST_VIS;
2566 case KVM_REG_PPC_VPA_ADDR:
2567 addr = set_reg_val(id, *val);
2569 if (!addr && (vcpu->arch.slb_shadow.next_gpa ||
2570 vcpu->arch.dtl.next_gpa))
2572 r = set_vpa(vcpu, &vcpu->arch.vpa, addr, sizeof(struct lppaca));
2574 case KVM_REG_PPC_VPA_SLB:
2575 addr = val->vpaval.addr;
2576 len = val->vpaval.length;
2578 if (addr && !vcpu->arch.vpa.next_gpa)
2580 r = set_vpa(vcpu, &vcpu->arch.slb_shadow, addr, len);
2582 case KVM_REG_PPC_VPA_DTL:
2583 addr = val->vpaval.addr;
2584 len = val->vpaval.length;
2586 if (addr && (len < sizeof(struct dtl_entry) ||
2587 !vcpu->arch.vpa.next_gpa))
2589 len -= len % sizeof(struct dtl_entry);
2590 r = set_vpa(vcpu, &vcpu->arch.dtl, addr, len);
2592 case KVM_REG_PPC_TB_OFFSET:
2594 /* round up to multiple of 2^24 */
2595 u64 tb_offset = ALIGN(set_reg_val(id, *val), 1UL << 24);
2598 * Now that we know the timebase offset, update the
2599 * decrementer expiry with a guest timebase value. If
2600 * the userspace does not set DEC_EXPIRY, this ensures
2601 * a migrated vcpu at least starts with an expired
2602 * decrementer, which is better than a large one that
2605 if (!vcpu->arch.dec_expires && tb_offset)
2606 vcpu->arch.dec_expires = get_tb() + tb_offset;
2608 vcpu->arch.vcore->tb_offset = tb_offset;
2611 case KVM_REG_PPC_LPCR:
2612 kvmppc_set_lpcr(vcpu, set_reg_val(id, *val), true);
2614 case KVM_REG_PPC_LPCR_64:
2615 kvmppc_set_lpcr(vcpu, set_reg_val(id, *val), false);
2617 case KVM_REG_PPC_PPR:
2618 vcpu->arch.ppr = set_reg_val(id, *val);
2620 #ifdef CONFIG_PPC_TRANSACTIONAL_MEM
2621 case KVM_REG_PPC_TFHAR:
2622 vcpu->arch.tfhar = set_reg_val(id, *val);
2624 case KVM_REG_PPC_TFIAR:
2625 vcpu->arch.tfiar = set_reg_val(id, *val);
2627 case KVM_REG_PPC_TEXASR:
2628 vcpu->arch.texasr = set_reg_val(id, *val);
2630 case KVM_REG_PPC_TM_GPR0 ... KVM_REG_PPC_TM_GPR31:
2631 i = id - KVM_REG_PPC_TM_GPR0;
2632 vcpu->arch.gpr_tm[i] = set_reg_val(id, *val);
2634 case KVM_REG_PPC_TM_VSR0 ... KVM_REG_PPC_TM_VSR63:
2637 i = id - KVM_REG_PPC_TM_VSR0;
2639 for (j = 0; j < TS_FPRWIDTH; j++)
2640 vcpu->arch.fp_tm.fpr[i][j] = val->vsxval[j];
2642 if (cpu_has_feature(CPU_FTR_ALTIVEC))
2643 vcpu->arch.vr_tm.vr[i-32] = val->vval;
2648 case KVM_REG_PPC_TM_CR:
2649 vcpu->arch.cr_tm = set_reg_val(id, *val);
2651 case KVM_REG_PPC_TM_XER:
2652 vcpu->arch.xer_tm = set_reg_val(id, *val);
2654 case KVM_REG_PPC_TM_LR:
2655 vcpu->arch.lr_tm = set_reg_val(id, *val);
2657 case KVM_REG_PPC_TM_CTR:
2658 vcpu->arch.ctr_tm = set_reg_val(id, *val);
2660 case KVM_REG_PPC_TM_FPSCR:
2661 vcpu->arch.fp_tm.fpscr = set_reg_val(id, *val);
2663 case KVM_REG_PPC_TM_AMR:
2664 vcpu->arch.amr_tm = set_reg_val(id, *val);
2666 case KVM_REG_PPC_TM_PPR:
2667 vcpu->arch.ppr_tm = set_reg_val(id, *val);
2669 case KVM_REG_PPC_TM_VRSAVE:
2670 vcpu->arch.vrsave_tm = set_reg_val(id, *val);
2672 case KVM_REG_PPC_TM_VSCR:
2673 if (cpu_has_feature(CPU_FTR_ALTIVEC))
2674 vcpu->arch.vr.vscr.u[3] = set_reg_val(id, *val);
2678 case KVM_REG_PPC_TM_DSCR:
2679 vcpu->arch.dscr_tm = set_reg_val(id, *val);
2681 case KVM_REG_PPC_TM_TAR:
2682 vcpu->arch.tar_tm = set_reg_val(id, *val);
2685 case KVM_REG_PPC_ARCH_COMPAT:
2686 r = kvmppc_set_arch_compat(vcpu, set_reg_val(id, *val));
2688 case KVM_REG_PPC_DEC_EXPIRY:
2689 vcpu->arch.dec_expires = set_reg_val(id, *val);
2691 case KVM_REG_PPC_ONLINE:
2692 i = set_reg_val(id, *val);
2693 if (i && !vcpu->arch.online)
2694 atomic_inc(&vcpu->arch.vcore->online_count);
2695 else if (!i && vcpu->arch.online)
2696 atomic_dec(&vcpu->arch.vcore->online_count);
2697 vcpu->arch.online = i;
2699 case KVM_REG_PPC_PTCR:
2700 vcpu->kvm->arch.l1_ptcr = set_reg_val(id, *val);
2711 * On POWER9, threads are independent and can be in different partitions.
2712 * Therefore we consider each thread to be a subcore.
2713 * There is a restriction that all threads have to be in the same
2714 * MMU mode (radix or HPT), unfortunately, but since we only support
2715 * HPT guests on a HPT host so far, that isn't an impediment yet.
2717 static int threads_per_vcore(struct kvm *kvm)
2719 if (cpu_has_feature(CPU_FTR_ARCH_300))
2721 return threads_per_subcore;
2724 static struct kvmppc_vcore *kvmppc_vcore_create(struct kvm *kvm, int id)
2726 struct kvmppc_vcore *vcore;
2728 vcore = kzalloc(sizeof(struct kvmppc_vcore), GFP_KERNEL);
2733 spin_lock_init(&vcore->lock);
2734 spin_lock_init(&vcore->stoltb_lock);
2735 rcuwait_init(&vcore->wait);
2736 vcore->preempt_tb = TB_NIL;
2737 vcore->lpcr = kvm->arch.lpcr;
2738 vcore->first_vcpuid = id;
2740 INIT_LIST_HEAD(&vcore->preempt_list);
2745 #ifdef CONFIG_KVM_BOOK3S_HV_EXIT_TIMING
2746 static struct debugfs_timings_element {
2750 #ifdef CONFIG_KVM_BOOK3S_HV_P9_TIMING
2751 {"vcpu_entry", offsetof(struct kvm_vcpu, arch.vcpu_entry)},
2752 {"guest_entry", offsetof(struct kvm_vcpu, arch.guest_entry)},
2753 {"in_guest", offsetof(struct kvm_vcpu, arch.in_guest)},
2754 {"guest_exit", offsetof(struct kvm_vcpu, arch.guest_exit)},
2755 {"vcpu_exit", offsetof(struct kvm_vcpu, arch.vcpu_exit)},
2756 {"hypercall", offsetof(struct kvm_vcpu, arch.hcall)},
2757 {"page_fault", offsetof(struct kvm_vcpu, arch.pg_fault)},
2759 {"rm_entry", offsetof(struct kvm_vcpu, arch.rm_entry)},
2760 {"rm_intr", offsetof(struct kvm_vcpu, arch.rm_intr)},
2761 {"rm_exit", offsetof(struct kvm_vcpu, arch.rm_exit)},
2762 {"guest", offsetof(struct kvm_vcpu, arch.guest_time)},
2763 {"cede", offsetof(struct kvm_vcpu, arch.cede_time)},
2767 #define N_TIMINGS (ARRAY_SIZE(timings))
2769 struct debugfs_timings_state {
2770 struct kvm_vcpu *vcpu;
2771 unsigned int buflen;
2772 char buf[N_TIMINGS * 100];
2775 static int debugfs_timings_open(struct inode *inode, struct file *file)
2777 struct kvm_vcpu *vcpu = inode->i_private;
2778 struct debugfs_timings_state *p;
2780 p = kzalloc(sizeof(*p), GFP_KERNEL);
2784 kvm_get_kvm(vcpu->kvm);
2786 file->private_data = p;
2788 return nonseekable_open(inode, file);
2791 static int debugfs_timings_release(struct inode *inode, struct file *file)
2793 struct debugfs_timings_state *p = file->private_data;
2795 kvm_put_kvm(p->vcpu->kvm);
2800 static ssize_t debugfs_timings_read(struct file *file, char __user *buf,
2801 size_t len, loff_t *ppos)
2803 struct debugfs_timings_state *p = file->private_data;
2804 struct kvm_vcpu *vcpu = p->vcpu;
2806 struct kvmhv_tb_accumulator tb;
2815 buf_end = s + sizeof(p->buf);
2816 for (i = 0; i < N_TIMINGS; ++i) {
2817 struct kvmhv_tb_accumulator *acc;
2819 acc = (struct kvmhv_tb_accumulator *)
2820 ((unsigned long)vcpu + timings[i].offset);
2822 for (loops = 0; loops < 1000; ++loops) {
2823 count = acc->seqcount;
2828 if (count == acc->seqcount) {
2836 snprintf(s, buf_end - s, "%s: stuck\n",
2839 snprintf(s, buf_end - s,
2840 "%s: %llu %llu %llu %llu\n",
2841 timings[i].name, count / 2,
2842 tb_to_ns(tb.tb_total),
2843 tb_to_ns(tb.tb_min),
2844 tb_to_ns(tb.tb_max));
2847 p->buflen = s - p->buf;
2851 if (pos >= p->buflen)
2853 if (len > p->buflen - pos)
2854 len = p->buflen - pos;
2855 n = copy_to_user(buf, p->buf + pos, len);
2865 static ssize_t debugfs_timings_write(struct file *file, const char __user *buf,
2866 size_t len, loff_t *ppos)
2871 static const struct file_operations debugfs_timings_ops = {
2872 .owner = THIS_MODULE,
2873 .open = debugfs_timings_open,
2874 .release = debugfs_timings_release,
2875 .read = debugfs_timings_read,
2876 .write = debugfs_timings_write,
2877 .llseek = generic_file_llseek,
2880 /* Create a debugfs directory for the vcpu */
2881 static int kvmppc_arch_create_vcpu_debugfs_hv(struct kvm_vcpu *vcpu, struct dentry *debugfs_dentry)
2883 if (cpu_has_feature(CPU_FTR_ARCH_300) == IS_ENABLED(CONFIG_KVM_BOOK3S_HV_P9_TIMING))
2884 debugfs_create_file("timings", 0444, debugfs_dentry, vcpu,
2885 &debugfs_timings_ops);
2889 #else /* CONFIG_KVM_BOOK3S_HV_EXIT_TIMING */
2890 static int kvmppc_arch_create_vcpu_debugfs_hv(struct kvm_vcpu *vcpu, struct dentry *debugfs_dentry)
2894 #endif /* CONFIG_KVM_BOOK3S_HV_EXIT_TIMING */
2896 static int kvmppc_core_vcpu_create_hv(struct kvm_vcpu *vcpu)
2900 struct kvmppc_vcore *vcore;
2907 vcpu->arch.shared = &vcpu->arch.shregs;
2908 #ifdef CONFIG_KVM_BOOK3S_PR_POSSIBLE
2910 * The shared struct is never shared on HV,
2911 * so we can always use host endianness
2913 #ifdef __BIG_ENDIAN__
2914 vcpu->arch.shared_big_endian = true;
2916 vcpu->arch.shared_big_endian = false;
2919 vcpu->arch.mmcr[0] = MMCR0_FC;
2920 if (cpu_has_feature(CPU_FTR_ARCH_31)) {
2921 vcpu->arch.mmcr[0] |= MMCR0_PMCCEXT;
2922 vcpu->arch.mmcra = MMCRA_BHRB_DISABLE;
2925 vcpu->arch.ctrl = CTRL_RUNLATCH;
2926 /* default to host PVR, since we can't spoof it */
2927 kvmppc_set_pvr_hv(vcpu, mfspr(SPRN_PVR));
2928 spin_lock_init(&vcpu->arch.vpa_update_lock);
2929 spin_lock_init(&vcpu->arch.tbacct_lock);
2930 vcpu->arch.busy_preempt = TB_NIL;
2931 vcpu->arch.shregs.msr = MSR_ME;
2932 vcpu->arch.intr_msr = MSR_SF | MSR_ME;
2935 * Set the default HFSCR for the guest from the host value.
2936 * This value is only used on POWER9 and later.
2937 * On >= POWER9, we want to virtualize the doorbell facility, so we
2938 * don't set the HFSCR_MSGP bit, and that causes those instructions
2939 * to trap and then we emulate them.
2941 vcpu->arch.hfscr = HFSCR_TAR | HFSCR_EBB | HFSCR_PM | HFSCR_BHRB |
2942 HFSCR_DSCR | HFSCR_VECVSX | HFSCR_FP;
2944 /* On POWER10 and later, allow prefixed instructions */
2945 if (cpu_has_feature(CPU_FTR_ARCH_31))
2946 vcpu->arch.hfscr |= HFSCR_PREFIX;
2948 if (cpu_has_feature(CPU_FTR_HVMODE)) {
2949 vcpu->arch.hfscr &= mfspr(SPRN_HFSCR);
2950 #ifdef CONFIG_PPC_TRANSACTIONAL_MEM
2951 if (cpu_has_feature(CPU_FTR_P9_TM_HV_ASSIST))
2952 vcpu->arch.hfscr |= HFSCR_TM;
2955 if (cpu_has_feature(CPU_FTR_TM_COMP))
2956 vcpu->arch.hfscr |= HFSCR_TM;
2958 vcpu->arch.hfscr_permitted = vcpu->arch.hfscr;
2961 * PM, EBB, TM are demand-faulted so start with it clear.
2963 vcpu->arch.hfscr &= ~(HFSCR_PM | HFSCR_EBB | HFSCR_TM);
2965 kvmppc_mmu_book3s_hv_init(vcpu);
2967 vcpu->arch.state = KVMPPC_VCPU_NOTREADY;
2969 init_waitqueue_head(&vcpu->arch.cpu_run);
2971 mutex_lock(&kvm->lock);
2974 if (cpu_has_feature(CPU_FTR_ARCH_300)) {
2975 if (id >= (KVM_MAX_VCPUS * kvm->arch.emul_smt_mode)) {
2976 pr_devel("KVM: VCPU ID too high\n");
2977 core = KVM_MAX_VCORES;
2979 BUG_ON(kvm->arch.smt_mode != 1);
2980 core = kvmppc_pack_vcpu_id(kvm, id);
2983 core = id / kvm->arch.smt_mode;
2985 if (core < KVM_MAX_VCORES) {
2986 vcore = kvm->arch.vcores[core];
2987 if (vcore && cpu_has_feature(CPU_FTR_ARCH_300)) {
2988 pr_devel("KVM: collision on id %u", id);
2990 } else if (!vcore) {
2992 * Take mmu_setup_lock for mutual exclusion
2993 * with kvmppc_update_lpcr().
2996 vcore = kvmppc_vcore_create(kvm,
2997 id & ~(kvm->arch.smt_mode - 1));
2998 mutex_lock(&kvm->arch.mmu_setup_lock);
2999 kvm->arch.vcores[core] = vcore;
3000 kvm->arch.online_vcores++;
3001 mutex_unlock(&kvm->arch.mmu_setup_lock);
3004 mutex_unlock(&kvm->lock);
3009 spin_lock(&vcore->lock);
3010 ++vcore->num_threads;
3011 spin_unlock(&vcore->lock);
3012 vcpu->arch.vcore = vcore;
3013 vcpu->arch.ptid = vcpu->vcpu_id - vcore->first_vcpuid;
3014 vcpu->arch.thread_cpu = -1;
3015 vcpu->arch.prev_cpu = -1;
3017 vcpu->arch.cpu_type = KVM_CPU_3S_64;
3018 kvmppc_sanity_check(vcpu);
3023 static int kvmhv_set_smt_mode(struct kvm *kvm, unsigned long smt_mode,
3024 unsigned long flags)
3031 if (smt_mode > MAX_SMT_THREADS || !is_power_of_2(smt_mode))
3033 if (!cpu_has_feature(CPU_FTR_ARCH_300)) {
3035 * On POWER8 (or POWER7), the threading mode is "strict",
3036 * so we pack smt_mode vcpus per vcore.
3038 if (smt_mode > threads_per_subcore)
3042 * On POWER9, the threading mode is "loose",
3043 * so each vcpu gets its own vcore.
3048 mutex_lock(&kvm->lock);
3050 if (!kvm->arch.online_vcores) {
3051 kvm->arch.smt_mode = smt_mode;
3052 kvm->arch.emul_smt_mode = esmt;
3055 mutex_unlock(&kvm->lock);
3060 static void unpin_vpa(struct kvm *kvm, struct kvmppc_vpa *vpa)
3062 if (vpa->pinned_addr)
3063 kvmppc_unpin_guest_page(kvm, vpa->pinned_addr, vpa->gpa,
3067 static void kvmppc_core_vcpu_free_hv(struct kvm_vcpu *vcpu)
3069 spin_lock(&vcpu->arch.vpa_update_lock);
3070 unpin_vpa(vcpu->kvm, &vcpu->arch.dtl);
3071 unpin_vpa(vcpu->kvm, &vcpu->arch.slb_shadow);
3072 unpin_vpa(vcpu->kvm, &vcpu->arch.vpa);
3073 spin_unlock(&vcpu->arch.vpa_update_lock);
3076 static int kvmppc_core_check_requests_hv(struct kvm_vcpu *vcpu)
3078 /* Indicate we want to get back into the guest */
3082 static void kvmppc_set_timer(struct kvm_vcpu *vcpu)
3084 unsigned long dec_nsec, now;
3087 if (now > kvmppc_dec_expires_host_tb(vcpu)) {
3088 /* decrementer has already gone negative */
3089 kvmppc_core_queue_dec(vcpu);
3090 kvmppc_core_prepare_to_enter(vcpu);
3093 dec_nsec = tb_to_ns(kvmppc_dec_expires_host_tb(vcpu) - now);
3094 hrtimer_start(&vcpu->arch.dec_timer, dec_nsec, HRTIMER_MODE_REL);
3095 vcpu->arch.timer_running = 1;
3098 extern int __kvmppc_vcore_entry(void);
3100 static void kvmppc_remove_runnable(struct kvmppc_vcore *vc,
3101 struct kvm_vcpu *vcpu, u64 tb)
3105 if (vcpu->arch.state != KVMPPC_VCPU_RUNNABLE)
3107 spin_lock_irq(&vcpu->arch.tbacct_lock);
3109 vcpu->arch.busy_stolen += vcore_stolen_time(vc, now) -
3110 vcpu->arch.stolen_logged;
3111 vcpu->arch.busy_preempt = now;
3112 vcpu->arch.state = KVMPPC_VCPU_BUSY_IN_HOST;
3113 spin_unlock_irq(&vcpu->arch.tbacct_lock);
3115 WRITE_ONCE(vc->runnable_threads[vcpu->arch.ptid], NULL);
3118 static int kvmppc_grab_hwthread(int cpu)
3120 struct paca_struct *tpaca;
3121 long timeout = 10000;
3123 tpaca = paca_ptrs[cpu];
3125 /* Ensure the thread won't go into the kernel if it wakes */
3126 tpaca->kvm_hstate.kvm_vcpu = NULL;
3127 tpaca->kvm_hstate.kvm_vcore = NULL;
3128 tpaca->kvm_hstate.napping = 0;
3130 tpaca->kvm_hstate.hwthread_req = 1;
3133 * If the thread is already executing in the kernel (e.g. handling
3134 * a stray interrupt), wait for it to get back to nap mode.
3135 * The smp_mb() is to ensure that our setting of hwthread_req
3136 * is visible before we look at hwthread_state, so if this
3137 * races with the code at system_reset_pSeries and the thread
3138 * misses our setting of hwthread_req, we are sure to see its
3139 * setting of hwthread_state, and vice versa.
3142 while (tpaca->kvm_hstate.hwthread_state == KVM_HWTHREAD_IN_KERNEL) {
3143 if (--timeout <= 0) {
3144 pr_err("KVM: couldn't grab cpu %d\n", cpu);
3152 static void kvmppc_release_hwthread(int cpu)
3154 struct paca_struct *tpaca;
3156 tpaca = paca_ptrs[cpu];
3157 tpaca->kvm_hstate.hwthread_req = 0;
3158 tpaca->kvm_hstate.kvm_vcpu = NULL;
3159 tpaca->kvm_hstate.kvm_vcore = NULL;
3160 tpaca->kvm_hstate.kvm_split_mode = NULL;
3163 static DEFINE_PER_CPU(struct kvm *, cpu_in_guest);
3165 static void radix_flush_cpu(struct kvm *kvm, int cpu, struct kvm_vcpu *vcpu)
3167 struct kvm_nested_guest *nested = vcpu->arch.nested;
3168 cpumask_t *need_tlb_flush;
3172 need_tlb_flush = &nested->need_tlb_flush;
3174 need_tlb_flush = &kvm->arch.need_tlb_flush;
3176 cpu = cpu_first_tlb_thread_sibling(cpu);
3177 for (i = cpu; i <= cpu_last_tlb_thread_sibling(cpu);
3178 i += cpu_tlb_thread_sibling_step())
3179 cpumask_set_cpu(i, need_tlb_flush);
3182 * Make sure setting of bit in need_tlb_flush precedes testing of
3183 * cpu_in_guest. The matching barrier on the other side is hwsync
3184 * when switching to guest MMU mode, which happens between
3185 * cpu_in_guest being set to the guest kvm, and need_tlb_flush bit
3190 for (i = cpu; i <= cpu_last_tlb_thread_sibling(cpu);
3191 i += cpu_tlb_thread_sibling_step()) {
3192 struct kvm *running = *per_cpu_ptr(&cpu_in_guest, i);
3195 smp_call_function_single(i, do_nothing, NULL, 1);
3199 static void do_migrate_away_vcpu(void *arg)
3201 struct kvm_vcpu *vcpu = arg;
3202 struct kvm *kvm = vcpu->kvm;
3205 * If the guest has GTSE, it may execute tlbie, so do a eieio; tlbsync;
3206 * ptesync sequence on the old CPU before migrating to a new one, in
3207 * case we interrupted the guest between a tlbie ; eieio ;
3208 * tlbsync; ptesync sequence.
3210 * Otherwise, ptesync is sufficient for ordering tlbiel sequences.
3212 if (kvm->arch.lpcr & LPCR_GTSE)
3213 asm volatile("eieio; tlbsync; ptesync");
3215 asm volatile("ptesync");
3218 static void kvmppc_prepare_radix_vcpu(struct kvm_vcpu *vcpu, int pcpu)
3220 struct kvm_nested_guest *nested = vcpu->arch.nested;
3221 struct kvm *kvm = vcpu->kvm;
3224 if (!cpu_has_feature(CPU_FTR_HVMODE))
3228 prev_cpu = nested->prev_cpu[vcpu->arch.nested_vcpu_id];
3230 prev_cpu = vcpu->arch.prev_cpu;
3233 * With radix, the guest can do TLB invalidations itself,
3234 * and it could choose to use the local form (tlbiel) if
3235 * it is invalidating a translation that has only ever been
3236 * used on one vcpu. However, that doesn't mean it has
3237 * only ever been used on one physical cpu, since vcpus
3238 * can move around between pcpus. To cope with this, when
3239 * a vcpu moves from one pcpu to another, we need to tell
3240 * any vcpus running on the same core as this vcpu previously
3241 * ran to flush the TLB.
3243 if (prev_cpu != pcpu) {
3244 if (prev_cpu >= 0) {
3245 if (cpu_first_tlb_thread_sibling(prev_cpu) !=
3246 cpu_first_tlb_thread_sibling(pcpu))
3247 radix_flush_cpu(kvm, prev_cpu, vcpu);
3249 smp_call_function_single(prev_cpu,
3250 do_migrate_away_vcpu, vcpu, 1);
3253 nested->prev_cpu[vcpu->arch.nested_vcpu_id] = pcpu;
3255 vcpu->arch.prev_cpu = pcpu;
3259 static void kvmppc_start_thread(struct kvm_vcpu *vcpu, struct kvmppc_vcore *vc)
3262 struct paca_struct *tpaca;
3266 if (vcpu->arch.timer_running) {
3267 hrtimer_try_to_cancel(&vcpu->arch.dec_timer);
3268 vcpu->arch.timer_running = 0;
3270 cpu += vcpu->arch.ptid;
3271 vcpu->cpu = vc->pcpu;
3272 vcpu->arch.thread_cpu = cpu;
3274 tpaca = paca_ptrs[cpu];
3275 tpaca->kvm_hstate.kvm_vcpu = vcpu;
3276 tpaca->kvm_hstate.ptid = cpu - vc->pcpu;
3277 tpaca->kvm_hstate.fake_suspend = 0;
3278 /* Order stores to hstate.kvm_vcpu etc. before store to kvm_vcore */
3280 tpaca->kvm_hstate.kvm_vcore = vc;
3281 if (cpu != smp_processor_id())
3282 kvmppc_ipi_thread(cpu);
3285 static void kvmppc_wait_for_nap(int n_threads)
3287 int cpu = smp_processor_id();
3292 for (loops = 0; loops < 1000000; ++loops) {
3294 * Check if all threads are finished.
3295 * We set the vcore pointer when starting a thread
3296 * and the thread clears it when finished, so we look
3297 * for any threads that still have a non-NULL vcore ptr.
3299 for (i = 1; i < n_threads; ++i)
3300 if (paca_ptrs[cpu + i]->kvm_hstate.kvm_vcore)
3302 if (i == n_threads) {
3309 for (i = 1; i < n_threads; ++i)
3310 if (paca_ptrs[cpu + i]->kvm_hstate.kvm_vcore)
3311 pr_err("KVM: CPU %d seems to be stuck\n", cpu + i);
3315 * Check that we are on thread 0 and that any other threads in
3316 * this core are off-line. Then grab the threads so they can't
3319 static int on_primary_thread(void)
3321 int cpu = smp_processor_id();
3324 /* Are we on a primary subcore? */
3325 if (cpu_thread_in_subcore(cpu))
3329 while (++thr < threads_per_subcore)
3330 if (cpu_online(cpu + thr))
3333 /* Grab all hw threads so they can't go into the kernel */
3334 for (thr = 1; thr < threads_per_subcore; ++thr) {
3335 if (kvmppc_grab_hwthread(cpu + thr)) {
3336 /* Couldn't grab one; let the others go */
3338 kvmppc_release_hwthread(cpu + thr);
3339 } while (--thr > 0);
3347 * A list of virtual cores for each physical CPU.
3348 * These are vcores that could run but their runner VCPU tasks are
3349 * (or may be) preempted.
3351 struct preempted_vcore_list {
3352 struct list_head list;
3356 static DEFINE_PER_CPU(struct preempted_vcore_list, preempted_vcores);
3358 static void init_vcore_lists(void)
3362 for_each_possible_cpu(cpu) {
3363 struct preempted_vcore_list *lp = &per_cpu(preempted_vcores, cpu);
3364 spin_lock_init(&lp->lock);
3365 INIT_LIST_HEAD(&lp->list);
3369 static void kvmppc_vcore_preempt(struct kvmppc_vcore *vc)
3371 struct preempted_vcore_list *lp = this_cpu_ptr(&preempted_vcores);
3373 WARN_ON_ONCE(cpu_has_feature(CPU_FTR_ARCH_300));
3375 vc->vcore_state = VCORE_PREEMPT;
3376 vc->pcpu = smp_processor_id();
3377 if (vc->num_threads < threads_per_vcore(vc->kvm)) {
3378 spin_lock(&lp->lock);
3379 list_add_tail(&vc->preempt_list, &lp->list);
3380 spin_unlock(&lp->lock);
3383 /* Start accumulating stolen time */
3384 kvmppc_core_start_stolen(vc, mftb());
3387 static void kvmppc_vcore_end_preempt(struct kvmppc_vcore *vc)
3389 struct preempted_vcore_list *lp;
3391 WARN_ON_ONCE(cpu_has_feature(CPU_FTR_ARCH_300));
3393 kvmppc_core_end_stolen(vc, mftb());
3394 if (!list_empty(&vc->preempt_list)) {
3395 lp = &per_cpu(preempted_vcores, vc->pcpu);
3396 spin_lock(&lp->lock);
3397 list_del_init(&vc->preempt_list);
3398 spin_unlock(&lp->lock);
3400 vc->vcore_state = VCORE_INACTIVE;
3404 * This stores information about the virtual cores currently
3405 * assigned to a physical core.
3409 int max_subcore_threads;
3411 int subcore_threads[MAX_SUBCORES];
3412 struct kvmppc_vcore *vc[MAX_SUBCORES];
3416 * This mapping means subcores 0 and 1 can use threads 0-3 and 4-7
3417 * respectively in 2-way micro-threading (split-core) mode on POWER8.
3419 static int subcore_thread_map[MAX_SUBCORES] = { 0, 4, 2, 6 };
3421 static void init_core_info(struct core_info *cip, struct kvmppc_vcore *vc)
3423 memset(cip, 0, sizeof(*cip));
3424 cip->n_subcores = 1;
3425 cip->max_subcore_threads = vc->num_threads;
3426 cip->total_threads = vc->num_threads;
3427 cip->subcore_threads[0] = vc->num_threads;
3431 static bool subcore_config_ok(int n_subcores, int n_threads)
3434 * POWER9 "SMT4" cores are permanently in what is effectively a 4-way
3435 * split-core mode, with one thread per subcore.
3437 if (cpu_has_feature(CPU_FTR_ARCH_300))
3438 return n_subcores <= 4 && n_threads == 1;
3440 /* On POWER8, can only dynamically split if unsplit to begin with */
3441 if (n_subcores > 1 && threads_per_subcore < MAX_SMT_THREADS)
3443 if (n_subcores > MAX_SUBCORES)
3445 if (n_subcores > 1) {
3446 if (!(dynamic_mt_modes & 2))
3448 if (n_subcores > 2 && !(dynamic_mt_modes & 4))
3452 return n_subcores * roundup_pow_of_two(n_threads) <= MAX_SMT_THREADS;
3455 static void init_vcore_to_run(struct kvmppc_vcore *vc)
3457 vc->entry_exit_map = 0;
3459 vc->napping_threads = 0;
3460 vc->conferring_threads = 0;
3461 vc->tb_offset_applied = 0;
3464 static bool can_dynamic_split(struct kvmppc_vcore *vc, struct core_info *cip)
3466 int n_threads = vc->num_threads;
3469 if (!cpu_has_feature(CPU_FTR_ARCH_207S))
3472 /* In one_vm_per_core mode, require all vcores to be from the same vm */
3473 if (one_vm_per_core && vc->kvm != cip->vc[0]->kvm)
3476 if (n_threads < cip->max_subcore_threads)
3477 n_threads = cip->max_subcore_threads;
3478 if (!subcore_config_ok(cip->n_subcores + 1, n_threads))
3480 cip->max_subcore_threads = n_threads;
3482 sub = cip->n_subcores;
3484 cip->total_threads += vc->num_threads;
3485 cip->subcore_threads[sub] = vc->num_threads;
3487 init_vcore_to_run(vc);
3488 list_del_init(&vc->preempt_list);
3494 * Work out whether it is possible to piggyback the execution of
3495 * vcore *pvc onto the execution of the other vcores described in *cip.
3497 static bool can_piggyback(struct kvmppc_vcore *pvc, struct core_info *cip,
3500 if (cip->total_threads + pvc->num_threads > target_threads)
3503 return can_dynamic_split(pvc, cip);
3506 static void prepare_threads(struct kvmppc_vcore *vc)
3509 struct kvm_vcpu *vcpu;
3511 for_each_runnable_thread(i, vcpu, vc) {
3512 if (signal_pending(vcpu->arch.run_task))
3513 vcpu->arch.ret = -EINTR;
3514 else if (vcpu->arch.vpa.update_pending ||
3515 vcpu->arch.slb_shadow.update_pending ||
3516 vcpu->arch.dtl.update_pending)
3517 vcpu->arch.ret = RESUME_GUEST;
3520 kvmppc_remove_runnable(vc, vcpu, mftb());
3521 wake_up(&vcpu->arch.cpu_run);
3525 static void collect_piggybacks(struct core_info *cip, int target_threads)
3527 struct preempted_vcore_list *lp = this_cpu_ptr(&preempted_vcores);
3528 struct kvmppc_vcore *pvc, *vcnext;
3530 spin_lock(&lp->lock);
3531 list_for_each_entry_safe(pvc, vcnext, &lp->list, preempt_list) {
3532 if (!spin_trylock(&pvc->lock))
3534 prepare_threads(pvc);
3535 if (!pvc->n_runnable || !pvc->kvm->arch.mmu_ready) {
3536 list_del_init(&pvc->preempt_list);
3537 if (pvc->runner == NULL) {
3538 pvc->vcore_state = VCORE_INACTIVE;
3539 kvmppc_core_end_stolen(pvc, mftb());
3541 spin_unlock(&pvc->lock);
3544 if (!can_piggyback(pvc, cip, target_threads)) {
3545 spin_unlock(&pvc->lock);
3548 kvmppc_core_end_stolen(pvc, mftb());
3549 pvc->vcore_state = VCORE_PIGGYBACK;
3550 if (cip->total_threads >= target_threads)
3553 spin_unlock(&lp->lock);
3556 static bool recheck_signals_and_mmu(struct core_info *cip)
3559 struct kvm_vcpu *vcpu;
3560 struct kvmppc_vcore *vc;
3562 for (sub = 0; sub < cip->n_subcores; ++sub) {
3564 if (!vc->kvm->arch.mmu_ready)
3566 for_each_runnable_thread(i, vcpu, vc)
3567 if (signal_pending(vcpu->arch.run_task))
3573 static void post_guest_process(struct kvmppc_vcore *vc, bool is_master)
3575 int still_running = 0, i;
3578 struct kvm_vcpu *vcpu;
3580 spin_lock(&vc->lock);
3582 for_each_runnable_thread(i, vcpu, vc) {
3584 * It's safe to unlock the vcore in the loop here, because
3585 * for_each_runnable_thread() is safe against removal of
3586 * the vcpu, and the vcore state is VCORE_EXITING here,
3587 * so any vcpus becoming runnable will have their arch.trap
3588 * set to zero and can't actually run in the guest.
3590 spin_unlock(&vc->lock);
3591 /* cancel pending dec exception if dec is positive */
3592 if (now < kvmppc_dec_expires_host_tb(vcpu) &&
3593 kvmppc_core_pending_dec(vcpu))
3594 kvmppc_core_dequeue_dec(vcpu);
3596 trace_kvm_guest_exit(vcpu);
3599 if (vcpu->arch.trap)
3600 ret = kvmppc_handle_exit_hv(vcpu,
3601 vcpu->arch.run_task);
3603 vcpu->arch.ret = ret;
3604 vcpu->arch.trap = 0;
3606 spin_lock(&vc->lock);
3607 if (is_kvmppc_resume_guest(vcpu->arch.ret)) {
3608 if (vcpu->arch.pending_exceptions)
3609 kvmppc_core_prepare_to_enter(vcpu);
3610 if (vcpu->arch.ceded)
3611 kvmppc_set_timer(vcpu);
3615 kvmppc_remove_runnable(vc, vcpu, mftb());
3616 wake_up(&vcpu->arch.cpu_run);
3620 if (still_running > 0) {
3621 kvmppc_vcore_preempt(vc);
3622 } else if (vc->runner) {
3623 vc->vcore_state = VCORE_PREEMPT;
3624 kvmppc_core_start_stolen(vc, mftb());
3626 vc->vcore_state = VCORE_INACTIVE;
3628 if (vc->n_runnable > 0 && vc->runner == NULL) {
3629 /* make sure there's a candidate runner awake */
3631 vcpu = next_runnable_thread(vc, &i);
3632 wake_up(&vcpu->arch.cpu_run);
3635 spin_unlock(&vc->lock);
3639 * Clear core from the list of active host cores as we are about to
3640 * enter the guest. Only do this if it is the primary thread of the
3641 * core (not if a subcore) that is entering the guest.
3643 static inline int kvmppc_clear_host_core(unsigned int cpu)
3647 if (!kvmppc_host_rm_ops_hv || cpu_thread_in_core(cpu))
3650 * Memory barrier can be omitted here as we will do a smp_wmb()
3651 * later in kvmppc_start_thread and we need ensure that state is
3652 * visible to other CPUs only after we enter guest.
3654 core = cpu >> threads_shift;
3655 kvmppc_host_rm_ops_hv->rm_core[core].rm_state.in_host = 0;
3660 * Advertise this core as an active host core since we exited the guest
3661 * Only need to do this if it is the primary thread of the core that is
3664 static inline int kvmppc_set_host_core(unsigned int cpu)
3668 if (!kvmppc_host_rm_ops_hv || cpu_thread_in_core(cpu))
3672 * Memory barrier can be omitted here because we do a spin_unlock
3673 * immediately after this which provides the memory barrier.
3675 core = cpu >> threads_shift;
3676 kvmppc_host_rm_ops_hv->rm_core[core].rm_state.in_host = 1;
3680 static void set_irq_happened(int trap)
3683 case BOOK3S_INTERRUPT_EXTERNAL:
3684 local_paca->irq_happened |= PACA_IRQ_EE;
3686 case BOOK3S_INTERRUPT_H_DOORBELL:
3687 local_paca->irq_happened |= PACA_IRQ_DBELL;
3689 case BOOK3S_INTERRUPT_HMI:
3690 local_paca->irq_happened |= PACA_IRQ_HMI;
3692 case BOOK3S_INTERRUPT_SYSTEM_RESET:
3693 replay_system_reset();
3699 * Run a set of guest threads on a physical core.
3700 * Called with vc->lock held.
3702 static noinline void kvmppc_run_core(struct kvmppc_vcore *vc)
3704 struct kvm_vcpu *vcpu;
3707 struct core_info core_info;
3708 struct kvmppc_vcore *pvc;
3709 struct kvm_split_mode split_info, *sip;
3710 int split, subcore_size, active;
3713 unsigned long cmd_bit, stat_bit;
3716 int controlled_threads;
3720 if (WARN_ON_ONCE(cpu_has_feature(CPU_FTR_ARCH_300)))
3724 * Remove from the list any threads that have a signal pending
3725 * or need a VPA update done
3727 prepare_threads(vc);
3729 /* if the runner is no longer runnable, let the caller pick a new one */
3730 if (vc->runner->arch.state != KVMPPC_VCPU_RUNNABLE)
3736 init_vcore_to_run(vc);
3737 vc->preempt_tb = TB_NIL;
3740 * Number of threads that we will be controlling: the same as
3741 * the number of threads per subcore, except on POWER9,
3742 * where it's 1 because the threads are (mostly) independent.
3744 controlled_threads = threads_per_vcore(vc->kvm);
3747 * Make sure we are running on primary threads, and that secondary
3748 * threads are offline. Also check if the number of threads in this
3749 * guest are greater than the current system threads per guest.
3751 if ((controlled_threads > 1) &&
3752 ((vc->num_threads > threads_per_subcore) || !on_primary_thread())) {
3753 for_each_runnable_thread(i, vcpu, vc) {
3754 vcpu->arch.ret = -EBUSY;
3755 kvmppc_remove_runnable(vc, vcpu, mftb());
3756 wake_up(&vcpu->arch.cpu_run);
3762 * See if we could run any other vcores on the physical core
3763 * along with this one.
3765 init_core_info(&core_info, vc);
3766 pcpu = smp_processor_id();
3767 target_threads = controlled_threads;
3768 if (target_smt_mode && target_smt_mode < target_threads)
3769 target_threads = target_smt_mode;
3770 if (vc->num_threads < target_threads)
3771 collect_piggybacks(&core_info, target_threads);
3774 * Hard-disable interrupts, and check resched flag and signals.
3775 * If we need to reschedule or deliver a signal, clean up
3776 * and return without going into the guest(s).
3777 * If the mmu_ready flag has been cleared, don't go into the
3778 * guest because that means a HPT resize operation is in progress.
3780 local_irq_disable();
3782 if (lazy_irq_pending() || need_resched() ||
3783 recheck_signals_and_mmu(&core_info)) {
3785 vc->vcore_state = VCORE_INACTIVE;
3786 /* Unlock all except the primary vcore */
3787 for (sub = 1; sub < core_info.n_subcores; ++sub) {
3788 pvc = core_info.vc[sub];
3789 /* Put back on to the preempted vcores list */
3790 kvmppc_vcore_preempt(pvc);
3791 spin_unlock(&pvc->lock);
3793 for (i = 0; i < controlled_threads; ++i)
3794 kvmppc_release_hwthread(pcpu + i);
3798 kvmppc_clear_host_core(pcpu);
3800 /* Decide on micro-threading (split-core) mode */
3801 subcore_size = threads_per_subcore;
3802 cmd_bit = stat_bit = 0;
3803 split = core_info.n_subcores;
3805 is_power8 = cpu_has_feature(CPU_FTR_ARCH_207S);
3809 memset(&split_info, 0, sizeof(split_info));
3810 for (sub = 0; sub < core_info.n_subcores; ++sub)
3811 split_info.vc[sub] = core_info.vc[sub];
3814 if (split == 2 && (dynamic_mt_modes & 2)) {
3815 cmd_bit = HID0_POWER8_1TO2LPAR;
3816 stat_bit = HID0_POWER8_2LPARMODE;
3819 cmd_bit = HID0_POWER8_1TO4LPAR;
3820 stat_bit = HID0_POWER8_4LPARMODE;
3822 subcore_size = MAX_SMT_THREADS / split;
3823 split_info.rpr = mfspr(SPRN_RPR);
3824 split_info.pmmar = mfspr(SPRN_PMMAR);
3825 split_info.ldbar = mfspr(SPRN_LDBAR);
3826 split_info.subcore_size = subcore_size;
3828 split_info.subcore_size = 1;
3831 /* order writes to split_info before kvm_split_mode pointer */
3835 for (thr = 0; thr < controlled_threads; ++thr) {
3836 struct paca_struct *paca = paca_ptrs[pcpu + thr];
3838 paca->kvm_hstate.napping = 0;
3839 paca->kvm_hstate.kvm_split_mode = sip;
3842 /* Initiate micro-threading (split-core) on POWER8 if required */
3844 unsigned long hid0 = mfspr(SPRN_HID0);
3846 hid0 |= cmd_bit | HID0_POWER8_DYNLPARDIS;
3848 mtspr(SPRN_HID0, hid0);
3851 hid0 = mfspr(SPRN_HID0);
3852 if (hid0 & stat_bit)
3859 * On POWER8, set RWMR register.
3860 * Since it only affects PURR and SPURR, it doesn't affect
3861 * the host, so we don't save/restore the host value.
3864 unsigned long rwmr_val = RWMR_RPA_P8_8THREAD;
3865 int n_online = atomic_read(&vc->online_count);
3868 * Use the 8-thread value if we're doing split-core
3869 * or if the vcore's online count looks bogus.
3871 if (split == 1 && threads_per_subcore == MAX_SMT_THREADS &&
3872 n_online >= 1 && n_online <= MAX_SMT_THREADS)
3873 rwmr_val = p8_rwmr_values[n_online];
3874 mtspr(SPRN_RWMR, rwmr_val);
3877 /* Start all the threads */
3879 for (sub = 0; sub < core_info.n_subcores; ++sub) {
3880 thr = is_power8 ? subcore_thread_map[sub] : sub;
3883 pvc = core_info.vc[sub];
3884 pvc->pcpu = pcpu + thr;
3885 for_each_runnable_thread(i, vcpu, pvc) {
3887 * XXX: is kvmppc_start_thread called too late here?
3888 * It updates vcpu->cpu and vcpu->arch.thread_cpu
3889 * which are used by kvmppc_fast_vcpu_kick_hv(), but
3890 * kick is called after new exceptions become available
3891 * and exceptions are checked earlier than here, by
3892 * kvmppc_core_prepare_to_enter.
3894 kvmppc_start_thread(vcpu, pvc);
3895 kvmppc_update_vpa_dispatch(vcpu, pvc);
3896 trace_kvm_guest_enter(vcpu);
3897 if (!vcpu->arch.ptid)
3899 active |= 1 << (thr + vcpu->arch.ptid);
3902 * We need to start the first thread of each subcore
3903 * even if it doesn't have a vcpu.
3906 kvmppc_start_thread(NULL, pvc);
3910 * Ensure that split_info.do_nap is set after setting
3911 * the vcore pointer in the PACA of the secondaries.
3916 * When doing micro-threading, poke the inactive threads as well.
3917 * This gets them to the nap instruction after kvm_do_nap,
3918 * which reduces the time taken to unsplit later.
3921 split_info.do_nap = 1; /* ask secondaries to nap when done */
3922 for (thr = 1; thr < threads_per_subcore; ++thr)
3923 if (!(active & (1 << thr)))
3924 kvmppc_ipi_thread(pcpu + thr);
3927 vc->vcore_state = VCORE_RUNNING;
3930 trace_kvmppc_run_core(vc, 0);
3932 for (sub = 0; sub < core_info.n_subcores; ++sub)
3933 spin_unlock(&core_info.vc[sub]->lock);
3935 guest_timing_enter_irqoff();
3937 srcu_idx = srcu_read_lock(&vc->kvm->srcu);
3939 guest_state_enter_irqoff();
3940 this_cpu_disable_ftrace();
3942 trap = __kvmppc_vcore_entry();
3944 this_cpu_enable_ftrace();
3945 guest_state_exit_irqoff();
3947 srcu_read_unlock(&vc->kvm->srcu, srcu_idx);
3949 set_irq_happened(trap);
3951 spin_lock(&vc->lock);
3952 /* prevent other vcpu threads from doing kvmppc_start_thread() now */
3953 vc->vcore_state = VCORE_EXITING;
3955 /* wait for secondary threads to finish writing their state to memory */
3956 kvmppc_wait_for_nap(controlled_threads);
3958 /* Return to whole-core mode if we split the core earlier */
3960 unsigned long hid0 = mfspr(SPRN_HID0);
3961 unsigned long loops = 0;
3963 hid0 &= ~HID0_POWER8_DYNLPARDIS;
3964 stat_bit = HID0_POWER8_2LPARMODE | HID0_POWER8_4LPARMODE;
3966 mtspr(SPRN_HID0, hid0);
3969 hid0 = mfspr(SPRN_HID0);
3970 if (!(hid0 & stat_bit))
3975 split_info.do_nap = 0;
3978 kvmppc_set_host_core(pcpu);
3980 if (!vtime_accounting_enabled_this_cpu()) {
3983 * Service IRQs here before guest_timing_exit_irqoff() so any
3984 * ticks that occurred while running the guest are accounted to
3985 * the guest. If vtime accounting is enabled, accounting uses
3986 * TB rather than ticks, so it can be done without enabling
3987 * interrupts here, which has the problem that it accounts
3988 * interrupt processing overhead to the host.
3990 local_irq_disable();
3992 guest_timing_exit_irqoff();
3996 /* Let secondaries go back to the offline loop */
3997 for (i = 0; i < controlled_threads; ++i) {
3998 kvmppc_release_hwthread(pcpu + i);
3999 if (sip && sip->napped[i])
4000 kvmppc_ipi_thread(pcpu + i);
4003 spin_unlock(&vc->lock);
4005 /* make sure updates to secondary vcpu structs are visible now */
4010 for (sub = 0; sub < core_info.n_subcores; ++sub) {
4011 pvc = core_info.vc[sub];
4012 post_guest_process(pvc, pvc == vc);
4015 spin_lock(&vc->lock);
4018 vc->vcore_state = VCORE_INACTIVE;
4019 trace_kvmppc_run_core(vc, 1);
4022 static inline bool hcall_is_xics(unsigned long req)
4024 return req == H_EOI || req == H_CPPR || req == H_IPI ||
4025 req == H_IPOLL || req == H_XIRR || req == H_XIRR_X;
4028 static void vcpu_vpa_increment_dispatch(struct kvm_vcpu *vcpu)
4030 struct lppaca *lp = vcpu->arch.vpa.pinned_addr;
4032 u32 yield_count = be32_to_cpu(lp->yield_count) + 1;
4033 lp->yield_count = cpu_to_be32(yield_count);
4034 vcpu->arch.vpa.dirty = 1;
4038 /* call our hypervisor to load up HV regs and go */
4039 static int kvmhv_vcpu_entry_p9_nested(struct kvm_vcpu *vcpu, u64 time_limit, unsigned long lpcr, u64 *tb)
4041 struct kvmppc_vcore *vc = vcpu->arch.vcore;
4042 unsigned long host_psscr;
4044 struct hv_guest_state hvregs;
4045 struct p9_host_os_sprs host_os_sprs;
4051 save_p9_host_os_sprs(&host_os_sprs);
4054 * We need to save and restore the guest visible part of the
4055 * psscr (i.e. using SPRN_PSSCR_PR) since the hypervisor
4056 * doesn't do this for us. Note only required if pseries since
4057 * this is done in kvmhv_vcpu_entry_p9() below otherwise.
4059 host_psscr = mfspr(SPRN_PSSCR_PR);
4061 kvmppc_msr_hard_disable_set_facilities(vcpu, msr);
4062 if (lazy_irq_pending())
4065 if (unlikely(load_vcpu_state(vcpu, &host_os_sprs)))
4066 msr = mfmsr(); /* TM restore can update msr */
4068 if (vcpu->arch.psscr != host_psscr)
4069 mtspr(SPRN_PSSCR_PR, vcpu->arch.psscr);
4071 kvmhv_save_hv_regs(vcpu, &hvregs);
4074 vcpu->arch.regs.msr = vcpu->arch.shregs.msr;
4075 hvregs.version = HV_GUEST_STATE_VERSION;
4076 if (vcpu->arch.nested) {
4077 hvregs.lpid = vcpu->arch.nested->shadow_lpid;
4078 hvregs.vcpu_token = vcpu->arch.nested_vcpu_id;
4080 hvregs.lpid = vcpu->kvm->arch.lpid;
4081 hvregs.vcpu_token = vcpu->vcpu_id;
4083 hvregs.hdec_expiry = time_limit;
4086 * When setting DEC, we must always deal with irq_work_raise
4087 * via NMI vs setting DEC. The problem occurs right as we
4088 * switch into guest mode if a NMI hits and sets pending work
4089 * and sets DEC, then that will apply to the guest and not
4090 * bring us back to the host.
4092 * irq_work_raise could check a flag (or possibly LPCR[HDICE]
4093 * for example) and set HDEC to 1? That wouldn't solve the
4094 * nested hv case which needs to abort the hcall or zero the
4097 * XXX: Another day's problem.
4099 mtspr(SPRN_DEC, kvmppc_dec_expires_host_tb(vcpu) - *tb);
4101 mtspr(SPRN_DAR, vcpu->arch.shregs.dar);
4102 mtspr(SPRN_DSISR, vcpu->arch.shregs.dsisr);
4103 switch_pmu_to_guest(vcpu, &host_os_sprs);
4104 accumulate_time(vcpu, &vcpu->arch.in_guest);
4105 trap = plpar_hcall_norets(H_ENTER_NESTED, __pa(&hvregs),
4106 __pa(&vcpu->arch.regs));
4107 accumulate_time(vcpu, &vcpu->arch.guest_exit);
4108 kvmhv_restore_hv_return_state(vcpu, &hvregs);
4109 switch_pmu_to_host(vcpu, &host_os_sprs);
4110 vcpu->arch.shregs.msr = vcpu->arch.regs.msr;
4111 vcpu->arch.shregs.dar = mfspr(SPRN_DAR);
4112 vcpu->arch.shregs.dsisr = mfspr(SPRN_DSISR);
4113 vcpu->arch.psscr = mfspr(SPRN_PSSCR_PR);
4115 store_vcpu_state(vcpu);
4117 dec = mfspr(SPRN_DEC);
4118 if (!(lpcr & LPCR_LD)) /* Sign extend if not using large decrementer */
4121 vcpu->arch.dec_expires = dec + (*tb + vc->tb_offset);
4123 timer_rearm_host_dec(*tb);
4125 restore_p9_host_os_sprs(vcpu, &host_os_sprs);
4126 if (vcpu->arch.psscr != host_psscr)
4127 mtspr(SPRN_PSSCR_PR, host_psscr);
4133 * Guest entry for POWER9 and later CPUs.
4135 static int kvmhv_p9_guest_entry(struct kvm_vcpu *vcpu, u64 time_limit,
4136 unsigned long lpcr, u64 *tb)
4138 struct kvm *kvm = vcpu->kvm;
4139 struct kvm_nested_guest *nested = vcpu->arch.nested;
4143 next_timer = timer_get_next_tb();
4144 if (*tb >= next_timer)
4145 return BOOK3S_INTERRUPT_HV_DECREMENTER;
4146 if (next_timer < time_limit)
4147 time_limit = next_timer;
4148 else if (*tb >= time_limit) /* nested time limit */
4149 return BOOK3S_INTERRUPT_NESTED_HV_DECREMENTER;
4151 vcpu->arch.ceded = 0;
4153 vcpu_vpa_increment_dispatch(vcpu);
4155 if (kvmhv_on_pseries()) {
4156 trap = kvmhv_vcpu_entry_p9_nested(vcpu, time_limit, lpcr, tb);
4158 /* H_CEDE has to be handled now, not later */
4159 if (trap == BOOK3S_INTERRUPT_SYSCALL && !nested &&
4160 kvmppc_get_gpr(vcpu, 3) == H_CEDE) {
4162 kvmppc_set_gpr(vcpu, 3, 0);
4166 } else if (nested) {
4167 __this_cpu_write(cpu_in_guest, kvm);
4168 trap = kvmhv_vcpu_entry_p9(vcpu, time_limit, lpcr, tb);
4169 __this_cpu_write(cpu_in_guest, NULL);
4172 kvmppc_xive_push_vcpu(vcpu);
4174 __this_cpu_write(cpu_in_guest, kvm);
4175 trap = kvmhv_vcpu_entry_p9(vcpu, time_limit, lpcr, tb);
4176 __this_cpu_write(cpu_in_guest, NULL);
4178 if (trap == BOOK3S_INTERRUPT_SYSCALL &&
4179 !(vcpu->arch.shregs.msr & MSR_PR)) {
4180 unsigned long req = kvmppc_get_gpr(vcpu, 3);
4183 * XIVE rearm and XICS hcalls must be handled
4184 * before xive context is pulled (is this
4187 if (req == H_CEDE) {
4188 /* H_CEDE has to be handled now */
4190 if (!kvmppc_xive_rearm_escalation(vcpu)) {
4192 * Pending escalation so abort
4195 vcpu->arch.ceded = 0;
4197 kvmppc_set_gpr(vcpu, 3, 0);
4200 } else if (req == H_ENTER_NESTED) {
4202 * L2 should not run with the L1
4203 * context so rearm and pull it.
4205 if (!kvmppc_xive_rearm_escalation(vcpu)) {
4207 * Pending escalation so abort
4210 kvmppc_set_gpr(vcpu, 3, 0);
4214 } else if (hcall_is_xics(req)) {
4217 ret = kvmppc_xive_xics_hcall(vcpu, req);
4218 if (ret != H_TOO_HARD) {
4219 kvmppc_set_gpr(vcpu, 3, ret);
4224 kvmppc_xive_pull_vcpu(vcpu);
4226 if (kvm_is_radix(kvm))
4227 vcpu->arch.slb_max = 0;
4230 vcpu_vpa_increment_dispatch(vcpu);
4236 * Wait for some other vcpu thread to execute us, and
4237 * wake us up when we need to handle something in the host.
4239 static void kvmppc_wait_for_exec(struct kvmppc_vcore *vc,
4240 struct kvm_vcpu *vcpu, int wait_state)
4244 prepare_to_wait(&vcpu->arch.cpu_run, &wait, wait_state);
4245 if (vcpu->arch.state == KVMPPC_VCPU_RUNNABLE) {
4246 spin_unlock(&vc->lock);
4248 spin_lock(&vc->lock);
4250 finish_wait(&vcpu->arch.cpu_run, &wait);
4253 static void grow_halt_poll_ns(struct kvmppc_vcore *vc)
4255 if (!halt_poll_ns_grow)
4258 vc->halt_poll_ns *= halt_poll_ns_grow;
4259 if (vc->halt_poll_ns < halt_poll_ns_grow_start)
4260 vc->halt_poll_ns = halt_poll_ns_grow_start;
4263 static void shrink_halt_poll_ns(struct kvmppc_vcore *vc)
4265 if (halt_poll_ns_shrink == 0)
4266 vc->halt_poll_ns = 0;
4268 vc->halt_poll_ns /= halt_poll_ns_shrink;
4271 #ifdef CONFIG_KVM_XICS
4272 static inline bool xive_interrupt_pending(struct kvm_vcpu *vcpu)
4274 if (!xics_on_xive())
4276 return vcpu->arch.irq_pending || vcpu->arch.xive_saved_state.pipr <
4277 vcpu->arch.xive_saved_state.cppr;
4280 static inline bool xive_interrupt_pending(struct kvm_vcpu *vcpu)
4284 #endif /* CONFIG_KVM_XICS */
4286 static bool kvmppc_vcpu_woken(struct kvm_vcpu *vcpu)
4288 if (vcpu->arch.pending_exceptions || vcpu->arch.prodded ||
4289 kvmppc_doorbell_pending(vcpu) || xive_interrupt_pending(vcpu))
4295 static bool kvmppc_vcpu_check_block(struct kvm_vcpu *vcpu)
4297 if (!vcpu->arch.ceded || kvmppc_vcpu_woken(vcpu))
4303 * Check to see if any of the runnable vcpus on the vcore have pending
4304 * exceptions or are no longer ceded
4306 static int kvmppc_vcore_check_block(struct kvmppc_vcore *vc)
4308 struct kvm_vcpu *vcpu;
4311 for_each_runnable_thread(i, vcpu, vc) {
4312 if (kvmppc_vcpu_check_block(vcpu))
4320 * All the vcpus in this vcore are idle, so wait for a decrementer
4321 * or external interrupt to one of the vcpus. vc->lock is held.
4323 static void kvmppc_vcore_blocked(struct kvmppc_vcore *vc)
4325 ktime_t cur, start_poll, start_wait;
4329 WARN_ON_ONCE(cpu_has_feature(CPU_FTR_ARCH_300));
4331 /* Poll for pending exceptions and ceded state */
4332 cur = start_poll = ktime_get();
4333 if (vc->halt_poll_ns) {
4334 ktime_t stop = ktime_add_ns(start_poll, vc->halt_poll_ns);
4335 ++vc->runner->stat.generic.halt_attempted_poll;
4337 vc->vcore_state = VCORE_POLLING;
4338 spin_unlock(&vc->lock);
4341 if (kvmppc_vcore_check_block(vc)) {
4346 } while (kvm_vcpu_can_poll(cur, stop));
4348 spin_lock(&vc->lock);
4349 vc->vcore_state = VCORE_INACTIVE;
4352 ++vc->runner->stat.generic.halt_successful_poll;
4357 prepare_to_rcuwait(&vc->wait);
4358 set_current_state(TASK_INTERRUPTIBLE);
4359 if (kvmppc_vcore_check_block(vc)) {
4360 finish_rcuwait(&vc->wait);
4362 /* If we polled, count this as a successful poll */
4363 if (vc->halt_poll_ns)
4364 ++vc->runner->stat.generic.halt_successful_poll;
4368 start_wait = ktime_get();
4370 vc->vcore_state = VCORE_SLEEPING;
4371 trace_kvmppc_vcore_blocked(vc->runner, 0);
4372 spin_unlock(&vc->lock);
4374 finish_rcuwait(&vc->wait);
4375 spin_lock(&vc->lock);
4376 vc->vcore_state = VCORE_INACTIVE;
4377 trace_kvmppc_vcore_blocked(vc->runner, 1);
4378 ++vc->runner->stat.halt_successful_wait;
4383 block_ns = ktime_to_ns(cur) - ktime_to_ns(start_poll);
4385 /* Attribute wait time */
4387 vc->runner->stat.generic.halt_wait_ns +=
4388 ktime_to_ns(cur) - ktime_to_ns(start_wait);
4389 KVM_STATS_LOG_HIST_UPDATE(
4390 vc->runner->stat.generic.halt_wait_hist,
4391 ktime_to_ns(cur) - ktime_to_ns(start_wait));
4392 /* Attribute failed poll time */
4393 if (vc->halt_poll_ns) {
4394 vc->runner->stat.generic.halt_poll_fail_ns +=
4395 ktime_to_ns(start_wait) -
4396 ktime_to_ns(start_poll);
4397 KVM_STATS_LOG_HIST_UPDATE(
4398 vc->runner->stat.generic.halt_poll_fail_hist,
4399 ktime_to_ns(start_wait) -
4400 ktime_to_ns(start_poll));
4403 /* Attribute successful poll time */
4404 if (vc->halt_poll_ns) {
4405 vc->runner->stat.generic.halt_poll_success_ns +=
4407 ktime_to_ns(start_poll);
4408 KVM_STATS_LOG_HIST_UPDATE(
4409 vc->runner->stat.generic.halt_poll_success_hist,
4410 ktime_to_ns(cur) - ktime_to_ns(start_poll));
4414 /* Adjust poll time */
4416 if (block_ns <= vc->halt_poll_ns)
4418 /* We slept and blocked for longer than the max halt time */
4419 else if (vc->halt_poll_ns && block_ns > halt_poll_ns)
4420 shrink_halt_poll_ns(vc);
4421 /* We slept and our poll time is too small */
4422 else if (vc->halt_poll_ns < halt_poll_ns &&
4423 block_ns < halt_poll_ns)
4424 grow_halt_poll_ns(vc);
4425 if (vc->halt_poll_ns > halt_poll_ns)
4426 vc->halt_poll_ns = halt_poll_ns;
4428 vc->halt_poll_ns = 0;
4430 trace_kvmppc_vcore_wakeup(do_sleep, block_ns);
4434 * This never fails for a radix guest, as none of the operations it does
4435 * for a radix guest can fail or have a way to report failure.
4437 static int kvmhv_setup_mmu(struct kvm_vcpu *vcpu)
4440 struct kvm *kvm = vcpu->kvm;
4442 mutex_lock(&kvm->arch.mmu_setup_lock);
4443 if (!kvm->arch.mmu_ready) {
4444 if (!kvm_is_radix(kvm))
4445 r = kvmppc_hv_setup_htab_rma(vcpu);
4447 if (cpu_has_feature(CPU_FTR_ARCH_300))
4448 kvmppc_setup_partition_table(kvm);
4449 kvm->arch.mmu_ready = 1;
4452 mutex_unlock(&kvm->arch.mmu_setup_lock);
4456 static int kvmppc_run_vcpu(struct kvm_vcpu *vcpu)
4458 struct kvm_run *run = vcpu->run;
4460 struct kvmppc_vcore *vc;
4463 trace_kvmppc_run_vcpu_enter(vcpu);
4465 run->exit_reason = 0;
4466 vcpu->arch.ret = RESUME_GUEST;
4467 vcpu->arch.trap = 0;
4468 kvmppc_update_vpas(vcpu);
4471 * Synchronize with other threads in this virtual core
4473 vc = vcpu->arch.vcore;
4474 spin_lock(&vc->lock);
4475 vcpu->arch.ceded = 0;
4476 vcpu->arch.run_task = current;
4477 vcpu->arch.stolen_logged = vcore_stolen_time(vc, mftb());
4478 vcpu->arch.state = KVMPPC_VCPU_RUNNABLE;
4479 vcpu->arch.busy_preempt = TB_NIL;
4480 WRITE_ONCE(vc->runnable_threads[vcpu->arch.ptid], vcpu);
4484 * This happens the first time this is called for a vcpu.
4485 * If the vcore is already running, we may be able to start
4486 * this thread straight away and have it join in.
4488 if (!signal_pending(current)) {
4489 if ((vc->vcore_state == VCORE_PIGGYBACK ||
4490 vc->vcore_state == VCORE_RUNNING) &&
4491 !VCORE_IS_EXITING(vc)) {
4492 kvmppc_update_vpa_dispatch(vcpu, vc);
4493 kvmppc_start_thread(vcpu, vc);
4494 trace_kvm_guest_enter(vcpu);
4495 } else if (vc->vcore_state == VCORE_SLEEPING) {
4496 rcuwait_wake_up(&vc->wait);
4501 while (vcpu->arch.state == KVMPPC_VCPU_RUNNABLE &&
4502 !signal_pending(current)) {
4503 /* See if the MMU is ready to go */
4504 if (!vcpu->kvm->arch.mmu_ready) {
4505 spin_unlock(&vc->lock);
4506 r = kvmhv_setup_mmu(vcpu);
4507 spin_lock(&vc->lock);
4509 run->exit_reason = KVM_EXIT_FAIL_ENTRY;
4511 hardware_entry_failure_reason = 0;
4517 if (vc->vcore_state == VCORE_PREEMPT && vc->runner == NULL)
4518 kvmppc_vcore_end_preempt(vc);
4520 if (vc->vcore_state != VCORE_INACTIVE) {
4521 kvmppc_wait_for_exec(vc, vcpu, TASK_INTERRUPTIBLE);
4524 for_each_runnable_thread(i, v, vc) {
4525 kvmppc_core_prepare_to_enter(v);
4526 if (signal_pending(v->arch.run_task)) {
4527 kvmppc_remove_runnable(vc, v, mftb());
4528 v->stat.signal_exits++;
4529 v->run->exit_reason = KVM_EXIT_INTR;
4530 v->arch.ret = -EINTR;
4531 wake_up(&v->arch.cpu_run);
4534 if (!vc->n_runnable || vcpu->arch.state != KVMPPC_VCPU_RUNNABLE)
4537 for_each_runnable_thread(i, v, vc) {
4538 if (!kvmppc_vcpu_woken(v))
4539 n_ceded += v->arch.ceded;
4544 if (n_ceded == vc->n_runnable) {
4545 kvmppc_vcore_blocked(vc);
4546 } else if (need_resched()) {
4547 kvmppc_vcore_preempt(vc);
4548 /* Let something else run */
4549 cond_resched_lock(&vc->lock);
4550 if (vc->vcore_state == VCORE_PREEMPT)
4551 kvmppc_vcore_end_preempt(vc);
4553 kvmppc_run_core(vc);
4558 while (vcpu->arch.state == KVMPPC_VCPU_RUNNABLE &&
4559 (vc->vcore_state == VCORE_RUNNING ||
4560 vc->vcore_state == VCORE_EXITING ||
4561 vc->vcore_state == VCORE_PIGGYBACK))
4562 kvmppc_wait_for_exec(vc, vcpu, TASK_UNINTERRUPTIBLE);
4564 if (vc->vcore_state == VCORE_PREEMPT && vc->runner == NULL)
4565 kvmppc_vcore_end_preempt(vc);
4567 if (vcpu->arch.state == KVMPPC_VCPU_RUNNABLE) {
4568 kvmppc_remove_runnable(vc, vcpu, mftb());
4569 vcpu->stat.signal_exits++;
4570 run->exit_reason = KVM_EXIT_INTR;
4571 vcpu->arch.ret = -EINTR;
4574 if (vc->n_runnable && vc->vcore_state == VCORE_INACTIVE) {
4575 /* Wake up some vcpu to run the core */
4577 v = next_runnable_thread(vc, &i);
4578 wake_up(&v->arch.cpu_run);
4581 trace_kvmppc_run_vcpu_exit(vcpu);
4582 spin_unlock(&vc->lock);
4583 return vcpu->arch.ret;
4586 int kvmhv_run_single_vcpu(struct kvm_vcpu *vcpu, u64 time_limit,
4589 struct rcuwait *wait = kvm_arch_vcpu_get_wait(vcpu);
4590 struct kvm_run *run = vcpu->run;
4593 struct kvmppc_vcore *vc;
4594 struct kvm *kvm = vcpu->kvm;
4595 struct kvm_nested_guest *nested = vcpu->arch.nested;
4596 unsigned long flags;
4599 trace_kvmppc_run_vcpu_enter(vcpu);
4601 run->exit_reason = 0;
4602 vcpu->arch.ret = RESUME_GUEST;
4603 vcpu->arch.trap = 0;
4605 vc = vcpu->arch.vcore;
4606 vcpu->arch.ceded = 0;
4607 vcpu->arch.run_task = current;
4608 vcpu->arch.last_inst = KVM_INST_FETCH_FAILED;
4610 /* See if the MMU is ready to go */
4611 if (unlikely(!kvm->arch.mmu_ready)) {
4612 r = kvmhv_setup_mmu(vcpu);
4614 run->exit_reason = KVM_EXIT_FAIL_ENTRY;
4615 run->fail_entry.hardware_entry_failure_reason = 0;
4624 kvmppc_update_vpas(vcpu);
4627 pcpu = smp_processor_id();
4628 if (kvm_is_radix(kvm))
4629 kvmppc_prepare_radix_vcpu(vcpu, pcpu);
4631 /* flags save not required, but irq_pmu has no disable/enable API */
4632 powerpc_local_irq_pmu_save(flags);
4634 vcpu->arch.state = KVMPPC_VCPU_RUNNABLE;
4636 if (signal_pending(current))
4638 if (need_resched() || !kvm->arch.mmu_ready)
4642 vcpu->arch.thread_cpu = pcpu;
4644 local_paca->kvm_hstate.kvm_vcpu = vcpu;
4645 local_paca->kvm_hstate.ptid = 0;
4646 local_paca->kvm_hstate.fake_suspend = 0;
4649 * Orders set cpu/thread_cpu vs testing for pending interrupts and
4650 * doorbells below. The other side is when these fields are set vs
4651 * kvmppc_fast_vcpu_kick_hv reading the cpu/thread_cpu fields to
4652 * kick a vCPU to notice the pending interrupt.
4657 kvmppc_core_prepare_to_enter(vcpu);
4658 if (vcpu->arch.shregs.msr & MSR_EE) {
4659 if (xive_interrupt_pending(vcpu))
4660 kvmppc_inject_interrupt_hv(vcpu,
4661 BOOK3S_INTERRUPT_EXTERNAL, 0);
4662 } else if (test_bit(BOOK3S_IRQPRIO_EXTERNAL,
4663 &vcpu->arch.pending_exceptions)) {
4666 } else if (vcpu->arch.pending_exceptions ||
4667 vcpu->arch.doorbell_request ||
4668 xive_interrupt_pending(vcpu)) {
4669 vcpu->arch.ret = RESUME_HOST;
4673 if (vcpu->arch.timer_running) {
4674 hrtimer_try_to_cancel(&vcpu->arch.dec_timer);
4675 vcpu->arch.timer_running = 0;
4680 kvmppc_update_vpa_dispatch_p9(vcpu, vc, tb + vc->tb_offset);
4682 trace_kvm_guest_enter(vcpu);
4684 guest_timing_enter_irqoff();
4686 srcu_idx = srcu_read_lock(&kvm->srcu);
4688 guest_state_enter_irqoff();
4689 this_cpu_disable_ftrace();
4691 trap = kvmhv_p9_guest_entry(vcpu, time_limit, lpcr, &tb);
4692 vcpu->arch.trap = trap;
4694 this_cpu_enable_ftrace();
4695 guest_state_exit_irqoff();
4697 srcu_read_unlock(&kvm->srcu, srcu_idx);
4699 set_irq_happened(trap);
4702 vcpu->arch.thread_cpu = -1;
4703 vcpu->arch.state = KVMPPC_VCPU_BUSY_IN_HOST;
4705 if (!vtime_accounting_enabled_this_cpu()) {
4706 powerpc_local_irq_pmu_restore(flags);
4708 * Service IRQs here before guest_timing_exit_irqoff() so any
4709 * ticks that occurred while running the guest are accounted to
4710 * the guest. If vtime accounting is enabled, accounting uses
4711 * TB rather than ticks, so it can be done without enabling
4712 * interrupts here, which has the problem that it accounts
4713 * interrupt processing overhead to the host.
4715 powerpc_local_irq_pmu_save(flags);
4717 guest_timing_exit_irqoff();
4719 powerpc_local_irq_pmu_restore(flags);
4724 * cancel pending decrementer exception if DEC is now positive, or if
4725 * entering a nested guest in which case the decrementer is now owned
4726 * by L2 and the L1 decrementer is provided in hdec_expires
4728 if (kvmppc_core_pending_dec(vcpu) &&
4729 ((tb < kvmppc_dec_expires_host_tb(vcpu)) ||
4730 (trap == BOOK3S_INTERRUPT_SYSCALL &&
4731 kvmppc_get_gpr(vcpu, 3) == H_ENTER_NESTED)))
4732 kvmppc_core_dequeue_dec(vcpu);
4734 trace_kvm_guest_exit(vcpu);
4738 r = kvmppc_handle_exit_hv(vcpu, current);
4740 r = kvmppc_handle_nested_exit(vcpu);
4744 if (is_kvmppc_resume_guest(r) && !kvmppc_vcpu_check_block(vcpu)) {
4745 kvmppc_set_timer(vcpu);
4747 prepare_to_rcuwait(wait);
4749 set_current_state(TASK_INTERRUPTIBLE);
4750 if (signal_pending(current)) {
4751 vcpu->stat.signal_exits++;
4752 run->exit_reason = KVM_EXIT_INTR;
4753 vcpu->arch.ret = -EINTR;
4757 if (kvmppc_vcpu_check_block(vcpu))
4760 trace_kvmppc_vcore_blocked(vcpu, 0);
4762 trace_kvmppc_vcore_blocked(vcpu, 1);
4764 finish_rcuwait(wait);
4766 vcpu->arch.ceded = 0;
4769 trace_kvmppc_run_vcpu_exit(vcpu);
4771 return vcpu->arch.ret;
4774 vcpu->stat.signal_exits++;
4775 run->exit_reason = KVM_EXIT_INTR;
4776 vcpu->arch.ret = -EINTR;
4779 vcpu->arch.thread_cpu = -1;
4780 vcpu->arch.state = KVMPPC_VCPU_BUSY_IN_HOST;
4781 powerpc_local_irq_pmu_restore(flags);
4786 static int kvmppc_vcpu_run_hv(struct kvm_vcpu *vcpu)
4788 struct kvm_run *run = vcpu->run;
4794 start_timing(vcpu, &vcpu->arch.vcpu_entry);
4796 if (!vcpu->arch.sane) {
4797 run->exit_reason = KVM_EXIT_INTERNAL_ERROR;
4801 /* No need to go into the guest when all we'll do is come back out */
4802 if (signal_pending(current)) {
4803 run->exit_reason = KVM_EXIT_INTR;
4807 #ifdef CONFIG_PPC_TRANSACTIONAL_MEM
4809 * Don't allow entry with a suspended transaction, because
4810 * the guest entry/exit code will lose it.
4812 if (cpu_has_feature(CPU_FTR_TM) && current->thread.regs &&
4813 (current->thread.regs->msr & MSR_TM)) {
4814 if (MSR_TM_ACTIVE(current->thread.regs->msr)) {
4815 run->exit_reason = KVM_EXIT_FAIL_ENTRY;
4816 run->fail_entry.hardware_entry_failure_reason = 0;
4823 * Force online to 1 for the sake of old userspace which doesn't
4826 if (!vcpu->arch.online) {
4827 atomic_inc(&vcpu->arch.vcore->online_count);
4828 vcpu->arch.online = 1;
4831 kvmppc_core_prepare_to_enter(vcpu);
4834 atomic_inc(&kvm->arch.vcpus_running);
4835 /* Order vcpus_running vs. mmu_ready, see kvmppc_alloc_reset_hpt */
4839 if (IS_ENABLED(CONFIG_PPC_FPU))
4841 if (cpu_has_feature(CPU_FTR_ALTIVEC))
4843 if (cpu_has_feature(CPU_FTR_VSX))
4845 if ((cpu_has_feature(CPU_FTR_TM) ||
4846 cpu_has_feature(CPU_FTR_P9_TM_HV_ASSIST)) &&
4847 (vcpu->arch.hfscr & HFSCR_TM))
4849 msr = msr_check_and_set(msr);
4851 kvmppc_save_user_regs();
4853 kvmppc_save_current_sprs();
4855 if (!cpu_has_feature(CPU_FTR_ARCH_300))
4856 vcpu->arch.waitp = &vcpu->arch.vcore->wait;
4857 vcpu->arch.pgdir = kvm->mm->pgd;
4858 vcpu->arch.state = KVMPPC_VCPU_BUSY_IN_HOST;
4861 accumulate_time(vcpu, &vcpu->arch.guest_entry);
4862 if (cpu_has_feature(CPU_FTR_ARCH_300))
4863 r = kvmhv_run_single_vcpu(vcpu, ~(u64)0,
4864 vcpu->arch.vcore->lpcr);
4866 r = kvmppc_run_vcpu(vcpu);
4868 if (run->exit_reason == KVM_EXIT_PAPR_HCALL) {
4869 accumulate_time(vcpu, &vcpu->arch.hcall);
4871 if (WARN_ON_ONCE(vcpu->arch.shregs.msr & MSR_PR)) {
4873 * These should have been caught reflected
4874 * into the guest by now. Final sanity check:
4875 * don't allow userspace to execute hcalls in
4881 trace_kvm_hcall_enter(vcpu);
4882 r = kvmppc_pseries_do_hcall(vcpu);
4883 trace_kvm_hcall_exit(vcpu, r);
4884 kvmppc_core_prepare_to_enter(vcpu);
4885 } else if (r == RESUME_PAGE_FAULT) {
4886 accumulate_time(vcpu, &vcpu->arch.pg_fault);
4887 srcu_idx = srcu_read_lock(&kvm->srcu);
4888 r = kvmppc_book3s_hv_page_fault(vcpu,
4889 vcpu->arch.fault_dar, vcpu->arch.fault_dsisr);
4890 srcu_read_unlock(&kvm->srcu, srcu_idx);
4891 } else if (r == RESUME_PASSTHROUGH) {
4892 if (WARN_ON(xics_on_xive()))
4895 r = kvmppc_xics_rm_complete(vcpu, 0);
4897 } while (is_kvmppc_resume_guest(r));
4898 accumulate_time(vcpu, &vcpu->arch.vcpu_exit);
4900 vcpu->arch.state = KVMPPC_VCPU_NOTREADY;
4901 atomic_dec(&kvm->arch.vcpus_running);
4903 srr_regs_clobbered();
4910 static void kvmppc_add_seg_page_size(struct kvm_ppc_one_seg_page_size **sps,
4911 int shift, int sllp)
4913 (*sps)->page_shift = shift;
4914 (*sps)->slb_enc = sllp;
4915 (*sps)->enc[0].page_shift = shift;
4916 (*sps)->enc[0].pte_enc = kvmppc_pgsize_lp_encoding(shift, shift);
4918 * Add 16MB MPSS support (may get filtered out by userspace)
4921 int penc = kvmppc_pgsize_lp_encoding(shift, 24);
4923 (*sps)->enc[1].page_shift = 24;
4924 (*sps)->enc[1].pte_enc = penc;
4930 static int kvm_vm_ioctl_get_smmu_info_hv(struct kvm *kvm,
4931 struct kvm_ppc_smmu_info *info)
4933 struct kvm_ppc_one_seg_page_size *sps;
4936 * POWER7, POWER8 and POWER9 all support 32 storage keys for data.
4937 * POWER7 doesn't support keys for instruction accesses,
4938 * POWER8 and POWER9 do.
4940 info->data_keys = 32;
4941 info->instr_keys = cpu_has_feature(CPU_FTR_ARCH_207S) ? 32 : 0;
4943 /* POWER7, 8 and 9 all have 1T segments and 32-entry SLB */
4944 info->flags = KVM_PPC_PAGE_SIZES_REAL | KVM_PPC_1T_SEGMENTS;
4945 info->slb_size = 32;
4947 /* We only support these sizes for now, and no muti-size segments */
4948 sps = &info->sps[0];
4949 kvmppc_add_seg_page_size(&sps, 12, 0);
4950 kvmppc_add_seg_page_size(&sps, 16, SLB_VSID_L | SLB_VSID_LP_01);
4951 kvmppc_add_seg_page_size(&sps, 24, SLB_VSID_L);
4953 /* If running as a nested hypervisor, we don't support HPT guests */
4954 if (kvmhv_on_pseries())
4955 info->flags |= KVM_PPC_NO_HASH;
4961 * Get (and clear) the dirty memory log for a memory slot.
4963 static int kvm_vm_ioctl_get_dirty_log_hv(struct kvm *kvm,
4964 struct kvm_dirty_log *log)
4966 struct kvm_memslots *slots;
4967 struct kvm_memory_slot *memslot;
4970 unsigned long *buf, *p;
4971 struct kvm_vcpu *vcpu;
4973 mutex_lock(&kvm->slots_lock);
4976 if (log->slot >= KVM_USER_MEM_SLOTS)
4979 slots = kvm_memslots(kvm);
4980 memslot = id_to_memslot(slots, log->slot);
4982 if (!memslot || !memslot->dirty_bitmap)
4986 * Use second half of bitmap area because both HPT and radix
4987 * accumulate bits in the first half.
4989 n = kvm_dirty_bitmap_bytes(memslot);
4990 buf = memslot->dirty_bitmap + n / sizeof(long);
4993 if (kvm_is_radix(kvm))
4994 r = kvmppc_hv_get_dirty_log_radix(kvm, memslot, buf);
4996 r = kvmppc_hv_get_dirty_log_hpt(kvm, memslot, buf);
5001 * We accumulate dirty bits in the first half of the
5002 * memslot's dirty_bitmap area, for when pages are paged
5003 * out or modified by the host directly. Pick up these
5004 * bits and add them to the map.
5006 p = memslot->dirty_bitmap;
5007 for (i = 0; i < n / sizeof(long); ++i)
5008 buf[i] |= xchg(&p[i], 0);
5010 /* Harvest dirty bits from VPA and DTL updates */
5011 /* Note: we never modify the SLB shadow buffer areas */
5012 kvm_for_each_vcpu(i, vcpu, kvm) {
5013 spin_lock(&vcpu->arch.vpa_update_lock);
5014 kvmppc_harvest_vpa_dirty(&vcpu->arch.vpa, memslot, buf);
5015 kvmppc_harvest_vpa_dirty(&vcpu->arch.dtl, memslot, buf);
5016 spin_unlock(&vcpu->arch.vpa_update_lock);
5020 if (copy_to_user(log->dirty_bitmap, buf, n))
5025 mutex_unlock(&kvm->slots_lock);
5029 static void kvmppc_core_free_memslot_hv(struct kvm_memory_slot *slot)
5031 vfree(slot->arch.rmap);
5032 slot->arch.rmap = NULL;
5035 static int kvmppc_core_prepare_memory_region_hv(struct kvm *kvm,
5036 const struct kvm_memory_slot *old,
5037 struct kvm_memory_slot *new,
5038 enum kvm_mr_change change)
5040 if (change == KVM_MR_CREATE) {
5041 unsigned long size = array_size(new->npages, sizeof(*new->arch.rmap));
5043 if ((size >> PAGE_SHIFT) > totalram_pages())
5046 new->arch.rmap = vzalloc(size);
5047 if (!new->arch.rmap)
5049 } else if (change != KVM_MR_DELETE) {
5050 new->arch.rmap = old->arch.rmap;
5056 static void kvmppc_core_commit_memory_region_hv(struct kvm *kvm,
5057 struct kvm_memory_slot *old,
5058 const struct kvm_memory_slot *new,
5059 enum kvm_mr_change change)
5062 * If we are creating or modifying a memslot, it might make
5063 * some address that was previously cached as emulated
5064 * MMIO be no longer emulated MMIO, so invalidate
5065 * all the caches of emulated MMIO translations.
5067 if (change != KVM_MR_DELETE)
5068 atomic64_inc(&kvm->arch.mmio_update);
5071 * For change == KVM_MR_MOVE or KVM_MR_DELETE, higher levels
5072 * have already called kvm_arch_flush_shadow_memslot() to
5073 * flush shadow mappings. For KVM_MR_CREATE we have no
5074 * previous mappings. So the only case to handle is
5075 * KVM_MR_FLAGS_ONLY when the KVM_MEM_LOG_DIRTY_PAGES bit
5077 * For radix guests, we flush on setting KVM_MEM_LOG_DIRTY_PAGES
5078 * to get rid of any THP PTEs in the partition-scoped page tables
5079 * so we can track dirtiness at the page level; we flush when
5080 * clearing KVM_MEM_LOG_DIRTY_PAGES so that we can go back to
5083 if (change == KVM_MR_FLAGS_ONLY && kvm_is_radix(kvm) &&
5084 ((new->flags ^ old->flags) & KVM_MEM_LOG_DIRTY_PAGES))
5085 kvmppc_radix_flush_memslot(kvm, old);
5087 * If UV hasn't yet called H_SVM_INIT_START, don't register memslots.
5089 if (!kvm->arch.secure_guest)
5095 * @TODO kvmppc_uvmem_memslot_create() can fail and
5096 * return error. Fix this.
5098 kvmppc_uvmem_memslot_create(kvm, new);
5101 kvmppc_uvmem_memslot_delete(kvm, old);
5104 /* TODO: Handle KVM_MR_MOVE */
5110 * Update LPCR values in kvm->arch and in vcores.
5111 * Caller must hold kvm->arch.mmu_setup_lock (for mutual exclusion
5112 * of kvm->arch.lpcr update).
5114 void kvmppc_update_lpcr(struct kvm *kvm, unsigned long lpcr, unsigned long mask)
5119 if ((kvm->arch.lpcr & mask) == lpcr)
5122 kvm->arch.lpcr = (kvm->arch.lpcr & ~mask) | lpcr;
5124 for (i = 0; i < KVM_MAX_VCORES; ++i) {
5125 struct kvmppc_vcore *vc = kvm->arch.vcores[i];
5129 spin_lock(&vc->lock);
5130 vc->lpcr = (vc->lpcr & ~mask) | lpcr;
5131 verify_lpcr(kvm, vc->lpcr);
5132 spin_unlock(&vc->lock);
5133 if (++cores_done >= kvm->arch.online_vcores)
5138 void kvmppc_setup_partition_table(struct kvm *kvm)
5140 unsigned long dw0, dw1;
5142 if (!kvm_is_radix(kvm)) {
5143 /* PS field - page size for VRMA */
5144 dw0 = ((kvm->arch.vrma_slb_v & SLB_VSID_L) >> 1) |
5145 ((kvm->arch.vrma_slb_v & SLB_VSID_LP) << 1);
5146 /* HTABSIZE and HTABORG fields */
5147 dw0 |= kvm->arch.sdr1;
5149 /* Second dword as set by userspace */
5150 dw1 = kvm->arch.process_table;
5152 dw0 = PATB_HR | radix__get_tree_size() |
5153 __pa(kvm->arch.pgtable) | RADIX_PGD_INDEX_SIZE;
5154 dw1 = PATB_GR | kvm->arch.process_table;
5156 kvmhv_set_ptbl_entry(kvm->arch.lpid, dw0, dw1);
5160 * Set up HPT (hashed page table) and RMA (real-mode area).
5161 * Must be called with kvm->arch.mmu_setup_lock held.
5163 static int kvmppc_hv_setup_htab_rma(struct kvm_vcpu *vcpu)
5166 struct kvm *kvm = vcpu->kvm;
5168 struct kvm_memory_slot *memslot;
5169 struct vm_area_struct *vma;
5170 unsigned long lpcr = 0, senc;
5171 unsigned long psize, porder;
5174 /* Allocate hashed page table (if not done already) and reset it */
5175 if (!kvm->arch.hpt.virt) {
5176 int order = KVM_DEFAULT_HPT_ORDER;
5177 struct kvm_hpt_info info;
5179 err = kvmppc_allocate_hpt(&info, order);
5180 /* If we get here, it means userspace didn't specify a
5181 * size explicitly. So, try successively smaller
5182 * sizes if the default failed. */
5183 while ((err == -ENOMEM) && --order >= PPC_MIN_HPT_ORDER)
5184 err = kvmppc_allocate_hpt(&info, order);
5187 pr_err("KVM: Couldn't alloc HPT\n");
5191 kvmppc_set_hpt(kvm, &info);
5194 /* Look up the memslot for guest physical address 0 */
5195 srcu_idx = srcu_read_lock(&kvm->srcu);
5196 memslot = gfn_to_memslot(kvm, 0);
5198 /* We must have some memory at 0 by now */
5200 if (!memslot || (memslot->flags & KVM_MEMSLOT_INVALID))
5203 /* Look up the VMA for the start of this memory slot */
5204 hva = memslot->userspace_addr;
5205 mmap_read_lock(kvm->mm);
5206 vma = vma_lookup(kvm->mm, hva);
5207 if (!vma || (vma->vm_flags & VM_IO))
5210 psize = vma_kernel_pagesize(vma);
5212 mmap_read_unlock(kvm->mm);
5214 /* We can handle 4k, 64k or 16M pages in the VRMA */
5215 if (psize >= 0x1000000)
5217 else if (psize >= 0x10000)
5221 porder = __ilog2(psize);
5223 senc = slb_pgsize_encoding(psize);
5224 kvm->arch.vrma_slb_v = senc | SLB_VSID_B_1T |
5225 (VRMA_VSID << SLB_VSID_SHIFT_1T);
5226 /* Create HPTEs in the hash page table for the VRMA */
5227 kvmppc_map_vrma(vcpu, memslot, porder);
5229 /* Update VRMASD field in the LPCR */
5230 if (!cpu_has_feature(CPU_FTR_ARCH_300)) {
5231 /* the -4 is to account for senc values starting at 0x10 */
5232 lpcr = senc << (LPCR_VRMASD_SH - 4);
5233 kvmppc_update_lpcr(kvm, lpcr, LPCR_VRMASD);
5236 /* Order updates to kvm->arch.lpcr etc. vs. mmu_ready */
5240 srcu_read_unlock(&kvm->srcu, srcu_idx);
5245 mmap_read_unlock(kvm->mm);
5250 * Must be called with kvm->arch.mmu_setup_lock held and
5251 * mmu_ready = 0 and no vcpus running.
5253 int kvmppc_switch_mmu_to_hpt(struct kvm *kvm)
5255 unsigned long lpcr, lpcr_mask;
5257 if (nesting_enabled(kvm))
5258 kvmhv_release_all_nested(kvm);
5259 kvmppc_rmap_reset(kvm);
5260 kvm->arch.process_table = 0;
5261 /* Mutual exclusion with kvm_unmap_gfn_range etc. */
5262 spin_lock(&kvm->mmu_lock);
5263 kvm->arch.radix = 0;
5264 spin_unlock(&kvm->mmu_lock);
5265 kvmppc_free_radix(kvm);
5268 lpcr_mask = LPCR_VPM1 | LPCR_UPRT | LPCR_GTSE | LPCR_HR;
5269 if (cpu_has_feature(CPU_FTR_ARCH_31))
5270 lpcr_mask |= LPCR_HAIL;
5271 kvmppc_update_lpcr(kvm, lpcr, lpcr_mask);
5277 * Must be called with kvm->arch.mmu_setup_lock held and
5278 * mmu_ready = 0 and no vcpus running.
5280 int kvmppc_switch_mmu_to_radix(struct kvm *kvm)
5282 unsigned long lpcr, lpcr_mask;
5285 err = kvmppc_init_vm_radix(kvm);
5288 kvmppc_rmap_reset(kvm);
5289 /* Mutual exclusion with kvm_unmap_gfn_range etc. */
5290 spin_lock(&kvm->mmu_lock);
5291 kvm->arch.radix = 1;
5292 spin_unlock(&kvm->mmu_lock);
5293 kvmppc_free_hpt(&kvm->arch.hpt);
5295 lpcr = LPCR_UPRT | LPCR_GTSE | LPCR_HR;
5296 lpcr_mask = LPCR_VPM1 | LPCR_UPRT | LPCR_GTSE | LPCR_HR;
5297 if (cpu_has_feature(CPU_FTR_ARCH_31)) {
5298 lpcr_mask |= LPCR_HAIL;
5299 if (cpu_has_feature(CPU_FTR_HVMODE) &&
5300 (kvm->arch.host_lpcr & LPCR_HAIL))
5303 kvmppc_update_lpcr(kvm, lpcr, lpcr_mask);
5308 #ifdef CONFIG_KVM_XICS
5310 * Allocate a per-core structure for managing state about which cores are
5311 * running in the host versus the guest and for exchanging data between
5312 * real mode KVM and CPU running in the host.
5313 * This is only done for the first VM.
5314 * The allocated structure stays even if all VMs have stopped.
5315 * It is only freed when the kvm-hv module is unloaded.
5316 * It's OK for this routine to fail, we just don't support host
5317 * core operations like redirecting H_IPI wakeups.
5319 void kvmppc_alloc_host_rm_ops(void)
5321 struct kvmppc_host_rm_ops *ops;
5322 unsigned long l_ops;
5326 if (cpu_has_feature(CPU_FTR_ARCH_300))
5329 /* Not the first time here ? */
5330 if (kvmppc_host_rm_ops_hv != NULL)
5333 ops = kzalloc(sizeof(struct kvmppc_host_rm_ops), GFP_KERNEL);
5337 size = cpu_nr_cores() * sizeof(struct kvmppc_host_rm_core);
5338 ops->rm_core = kzalloc(size, GFP_KERNEL);
5340 if (!ops->rm_core) {
5347 for (cpu = 0; cpu < nr_cpu_ids; cpu += threads_per_core) {
5348 if (!cpu_online(cpu))
5351 core = cpu >> threads_shift;
5352 ops->rm_core[core].rm_state.in_host = 1;
5355 ops->vcpu_kick = kvmppc_fast_vcpu_kick_hv;
5358 * Make the contents of the kvmppc_host_rm_ops structure visible
5359 * to other CPUs before we assign it to the global variable.
5360 * Do an atomic assignment (no locks used here), but if someone
5361 * beats us to it, just free our copy and return.
5364 l_ops = (unsigned long) ops;
5366 if (cmpxchg64((unsigned long *)&kvmppc_host_rm_ops_hv, 0, l_ops)) {
5368 kfree(ops->rm_core);
5373 cpuhp_setup_state_nocalls_cpuslocked(CPUHP_KVM_PPC_BOOK3S_PREPARE,
5374 "ppc/kvm_book3s:prepare",
5375 kvmppc_set_host_core,
5376 kvmppc_clear_host_core);
5380 void kvmppc_free_host_rm_ops(void)
5382 if (kvmppc_host_rm_ops_hv) {
5383 cpuhp_remove_state_nocalls(CPUHP_KVM_PPC_BOOK3S_PREPARE);
5384 kfree(kvmppc_host_rm_ops_hv->rm_core);
5385 kfree(kvmppc_host_rm_ops_hv);
5386 kvmppc_host_rm_ops_hv = NULL;
5391 static int kvmppc_core_init_vm_hv(struct kvm *kvm)
5393 unsigned long lpcr, lpid;
5396 mutex_init(&kvm->arch.uvmem_lock);
5397 INIT_LIST_HEAD(&kvm->arch.uvmem_pfns);
5398 mutex_init(&kvm->arch.mmu_setup_lock);
5400 /* Allocate the guest's logical partition ID */
5402 lpid = kvmppc_alloc_lpid();
5405 kvm->arch.lpid = lpid;
5407 kvmppc_alloc_host_rm_ops();
5409 kvmhv_vm_nested_init(kvm);
5412 * Since we don't flush the TLB when tearing down a VM,
5413 * and this lpid might have previously been used,
5414 * make sure we flush on each core before running the new VM.
5415 * On POWER9, the tlbie in mmu_partition_table_set_entry()
5416 * does this flush for us.
5418 if (!cpu_has_feature(CPU_FTR_ARCH_300))
5419 cpumask_setall(&kvm->arch.need_tlb_flush);
5421 /* Start out with the default set of hcalls enabled */
5422 memcpy(kvm->arch.enabled_hcalls, default_enabled_hcalls,
5423 sizeof(kvm->arch.enabled_hcalls));
5425 if (!cpu_has_feature(CPU_FTR_ARCH_300))
5426 kvm->arch.host_sdr1 = mfspr(SPRN_SDR1);
5428 /* Init LPCR for virtual RMA mode */
5429 if (cpu_has_feature(CPU_FTR_HVMODE)) {
5430 kvm->arch.host_lpid = mfspr(SPRN_LPID);
5431 kvm->arch.host_lpcr = lpcr = mfspr(SPRN_LPCR);
5432 lpcr &= LPCR_PECE | LPCR_LPES;
5435 * The L2 LPES mode will be set by the L0 according to whether
5436 * or not it needs to take external interrupts in HV mode.
5440 lpcr |= (4UL << LPCR_DPFD_SH) | LPCR_HDICE |
5441 LPCR_VPM0 | LPCR_VPM1;
5442 kvm->arch.vrma_slb_v = SLB_VSID_B_1T |
5443 (VRMA_VSID << SLB_VSID_SHIFT_1T);
5444 /* On POWER8 turn on online bit to enable PURR/SPURR */
5445 if (cpu_has_feature(CPU_FTR_ARCH_207S))
5448 * On POWER9, VPM0 bit is reserved (VPM0=1 behaviour is assumed)
5449 * Set HVICE bit to enable hypervisor virtualization interrupts.
5450 * Set HEIC to prevent OS interrupts to go to hypervisor (should
5451 * be unnecessary but better safe than sorry in case we re-enable
5452 * EE in HV mode with this LPCR still set)
5454 if (cpu_has_feature(CPU_FTR_ARCH_300)) {
5456 lpcr |= LPCR_HVICE | LPCR_HEIC;
5459 * If xive is enabled, we route 0x500 interrupts directly
5467 * If the host uses radix, the guest starts out as radix.
5469 if (radix_enabled()) {
5470 kvm->arch.radix = 1;
5471 kvm->arch.mmu_ready = 1;
5473 lpcr |= LPCR_UPRT | LPCR_GTSE | LPCR_HR;
5474 if (cpu_has_feature(CPU_FTR_HVMODE) &&
5475 cpu_has_feature(CPU_FTR_ARCH_31) &&
5476 (kvm->arch.host_lpcr & LPCR_HAIL))
5478 ret = kvmppc_init_vm_radix(kvm);
5480 kvmppc_free_lpid(kvm->arch.lpid);
5483 kvmppc_setup_partition_table(kvm);
5486 verify_lpcr(kvm, lpcr);
5487 kvm->arch.lpcr = lpcr;
5489 /* Initialization for future HPT resizes */
5490 kvm->arch.resize_hpt = NULL;
5493 * Work out how many sets the TLB has, for the use of
5494 * the TLB invalidation loop in book3s_hv_rmhandlers.S.
5496 if (cpu_has_feature(CPU_FTR_ARCH_31)) {
5498 * P10 will flush all the congruence class with a single tlbiel
5500 kvm->arch.tlb_sets = 1;
5501 } else if (radix_enabled())
5502 kvm->arch.tlb_sets = POWER9_TLB_SETS_RADIX; /* 128 */
5503 else if (cpu_has_feature(CPU_FTR_ARCH_300))
5504 kvm->arch.tlb_sets = POWER9_TLB_SETS_HASH; /* 256 */
5505 else if (cpu_has_feature(CPU_FTR_ARCH_207S))
5506 kvm->arch.tlb_sets = POWER8_TLB_SETS; /* 512 */
5508 kvm->arch.tlb_sets = POWER7_TLB_SETS; /* 128 */
5511 * Track that we now have a HV mode VM active. This blocks secondary
5512 * CPU threads from coming online.
5514 if (!cpu_has_feature(CPU_FTR_ARCH_300))
5515 kvm_hv_vm_activated();
5518 * Initialize smt_mode depending on processor.
5519 * POWER8 and earlier have to use "strict" threading, where
5520 * all vCPUs in a vcore have to run on the same (sub)core,
5521 * whereas on POWER9 the threads can each run a different
5524 if (!cpu_has_feature(CPU_FTR_ARCH_300))
5525 kvm->arch.smt_mode = threads_per_subcore;
5527 kvm->arch.smt_mode = 1;
5528 kvm->arch.emul_smt_mode = 1;
5533 static int kvmppc_arch_create_vm_debugfs_hv(struct kvm *kvm)
5535 kvmppc_mmu_debugfs_init(kvm);
5536 if (radix_enabled())
5537 kvmhv_radix_debugfs_init(kvm);
5541 static void kvmppc_free_vcores(struct kvm *kvm)
5545 for (i = 0; i < KVM_MAX_VCORES; ++i)
5546 kfree(kvm->arch.vcores[i]);
5547 kvm->arch.online_vcores = 0;
5550 static void kvmppc_core_destroy_vm_hv(struct kvm *kvm)
5552 if (!cpu_has_feature(CPU_FTR_ARCH_300))
5553 kvm_hv_vm_deactivated();
5555 kvmppc_free_vcores(kvm);
5558 if (kvm_is_radix(kvm))
5559 kvmppc_free_radix(kvm);
5561 kvmppc_free_hpt(&kvm->arch.hpt);
5563 /* Perform global invalidation and return lpid to the pool */
5564 if (cpu_has_feature(CPU_FTR_ARCH_300)) {
5565 if (nesting_enabled(kvm))
5566 kvmhv_release_all_nested(kvm);
5567 kvm->arch.process_table = 0;
5568 if (kvm->arch.secure_guest)
5569 uv_svm_terminate(kvm->arch.lpid);
5570 kvmhv_set_ptbl_entry(kvm->arch.lpid, 0, 0);
5573 kvmppc_free_lpid(kvm->arch.lpid);
5575 kvmppc_free_pimap(kvm);
5578 /* We don't need to emulate any privileged instructions or dcbz */
5579 static int kvmppc_core_emulate_op_hv(struct kvm_vcpu *vcpu,
5580 unsigned int inst, int *advance)
5582 return EMULATE_FAIL;
5585 static int kvmppc_core_emulate_mtspr_hv(struct kvm_vcpu *vcpu, int sprn,
5588 return EMULATE_FAIL;
5591 static int kvmppc_core_emulate_mfspr_hv(struct kvm_vcpu *vcpu, int sprn,
5594 return EMULATE_FAIL;
5597 static int kvmppc_core_check_processor_compat_hv(void)
5599 if (cpu_has_feature(CPU_FTR_HVMODE) &&
5600 cpu_has_feature(CPU_FTR_ARCH_206))
5603 /* POWER9 in radix mode is capable of being a nested hypervisor. */
5604 if (cpu_has_feature(CPU_FTR_ARCH_300) && radix_enabled())
5610 #ifdef CONFIG_KVM_XICS
5612 void kvmppc_free_pimap(struct kvm *kvm)
5614 kfree(kvm->arch.pimap);
5617 static struct kvmppc_passthru_irqmap *kvmppc_alloc_pimap(void)
5619 return kzalloc(sizeof(struct kvmppc_passthru_irqmap), GFP_KERNEL);
5622 static int kvmppc_set_passthru_irq(struct kvm *kvm, int host_irq, int guest_gsi)
5624 struct irq_desc *desc;
5625 struct kvmppc_irq_map *irq_map;
5626 struct kvmppc_passthru_irqmap *pimap;
5627 struct irq_chip *chip;
5629 struct irq_data *host_data;
5631 if (!kvm_irq_bypass)
5634 desc = irq_to_desc(host_irq);
5638 mutex_lock(&kvm->lock);
5640 pimap = kvm->arch.pimap;
5641 if (pimap == NULL) {
5642 /* First call, allocate structure to hold IRQ map */
5643 pimap = kvmppc_alloc_pimap();
5644 if (pimap == NULL) {
5645 mutex_unlock(&kvm->lock);
5648 kvm->arch.pimap = pimap;
5652 * For now, we only support interrupts for which the EOI operation
5653 * is an OPAL call followed by a write to XIRR, since that's
5654 * what our real-mode EOI code does, or a XIVE interrupt
5656 chip = irq_data_get_irq_chip(&desc->irq_data);
5657 if (!chip || !is_pnv_opal_msi(chip)) {
5658 pr_warn("kvmppc_set_passthru_irq_hv: Could not assign IRQ map for (%d,%d)\n",
5659 host_irq, guest_gsi);
5660 mutex_unlock(&kvm->lock);
5665 * See if we already have an entry for this guest IRQ number.
5666 * If it's mapped to a hardware IRQ number, that's an error,
5667 * otherwise re-use this entry.
5669 for (i = 0; i < pimap->n_mapped; i++) {
5670 if (guest_gsi == pimap->mapped[i].v_hwirq) {
5671 if (pimap->mapped[i].r_hwirq) {
5672 mutex_unlock(&kvm->lock);
5679 if (i == KVMPPC_PIRQ_MAPPED) {
5680 mutex_unlock(&kvm->lock);
5681 return -EAGAIN; /* table is full */
5684 irq_map = &pimap->mapped[i];
5686 irq_map->v_hwirq = guest_gsi;
5687 irq_map->desc = desc;
5690 * Order the above two stores before the next to serialize with
5691 * the KVM real mode handler.
5696 * The 'host_irq' number is mapped in the PCI-MSI domain but
5697 * the underlying calls, which will EOI the interrupt in real
5698 * mode, need an HW IRQ number mapped in the XICS IRQ domain.
5700 host_data = irq_domain_get_irq_data(irq_get_default_host(), host_irq);
5701 irq_map->r_hwirq = (unsigned int)irqd_to_hwirq(host_data);
5703 if (i == pimap->n_mapped)
5707 rc = kvmppc_xive_set_mapped(kvm, guest_gsi, host_irq);
5709 kvmppc_xics_set_mapped(kvm, guest_gsi, irq_map->r_hwirq);
5711 irq_map->r_hwirq = 0;
5713 mutex_unlock(&kvm->lock);
5718 static int kvmppc_clr_passthru_irq(struct kvm *kvm, int host_irq, int guest_gsi)
5720 struct irq_desc *desc;
5721 struct kvmppc_passthru_irqmap *pimap;
5724 if (!kvm_irq_bypass)
5727 desc = irq_to_desc(host_irq);
5731 mutex_lock(&kvm->lock);
5732 if (!kvm->arch.pimap)
5735 pimap = kvm->arch.pimap;
5737 for (i = 0; i < pimap->n_mapped; i++) {
5738 if (guest_gsi == pimap->mapped[i].v_hwirq)
5742 if (i == pimap->n_mapped) {
5743 mutex_unlock(&kvm->lock);
5748 rc = kvmppc_xive_clr_mapped(kvm, guest_gsi, host_irq);
5750 kvmppc_xics_clr_mapped(kvm, guest_gsi, pimap->mapped[i].r_hwirq);
5752 /* invalidate the entry (what to do on error from the above ?) */
5753 pimap->mapped[i].r_hwirq = 0;
5756 * We don't free this structure even when the count goes to
5757 * zero. The structure is freed when we destroy the VM.
5760 mutex_unlock(&kvm->lock);
5764 static int kvmppc_irq_bypass_add_producer_hv(struct irq_bypass_consumer *cons,
5765 struct irq_bypass_producer *prod)
5768 struct kvm_kernel_irqfd *irqfd =
5769 container_of(cons, struct kvm_kernel_irqfd, consumer);
5771 irqfd->producer = prod;
5773 ret = kvmppc_set_passthru_irq(irqfd->kvm, prod->irq, irqfd->gsi);
5775 pr_info("kvmppc_set_passthru_irq (irq %d, gsi %d) fails: %d\n",
5776 prod->irq, irqfd->gsi, ret);
5781 static void kvmppc_irq_bypass_del_producer_hv(struct irq_bypass_consumer *cons,
5782 struct irq_bypass_producer *prod)
5785 struct kvm_kernel_irqfd *irqfd =
5786 container_of(cons, struct kvm_kernel_irqfd, consumer);
5788 irqfd->producer = NULL;
5791 * When producer of consumer is unregistered, we change back to
5792 * default external interrupt handling mode - KVM real mode
5793 * will switch back to host.
5795 ret = kvmppc_clr_passthru_irq(irqfd->kvm, prod->irq, irqfd->gsi);
5797 pr_warn("kvmppc_clr_passthru_irq (irq %d, gsi %d) fails: %d\n",
5798 prod->irq, irqfd->gsi, ret);
5802 static int kvm_arch_vm_ioctl_hv(struct file *filp,
5803 unsigned int ioctl, unsigned long arg)
5805 struct kvm *kvm __maybe_unused = filp->private_data;
5806 void __user *argp = (void __user *)arg;
5811 case KVM_PPC_ALLOCATE_HTAB: {
5814 /* If we're a nested hypervisor, we currently only support radix */
5815 if (kvmhv_on_pseries()) {
5821 if (get_user(htab_order, (u32 __user *)argp))
5823 r = kvmppc_alloc_reset_hpt(kvm, htab_order);
5830 case KVM_PPC_GET_HTAB_FD: {
5831 struct kvm_get_htab_fd ghf;
5834 if (copy_from_user(&ghf, argp, sizeof(ghf)))
5836 r = kvm_vm_ioctl_get_htab_fd(kvm, &ghf);
5840 case KVM_PPC_RESIZE_HPT_PREPARE: {
5841 struct kvm_ppc_resize_hpt rhpt;
5844 if (copy_from_user(&rhpt, argp, sizeof(rhpt)))
5847 r = kvm_vm_ioctl_resize_hpt_prepare(kvm, &rhpt);
5851 case KVM_PPC_RESIZE_HPT_COMMIT: {
5852 struct kvm_ppc_resize_hpt rhpt;
5855 if (copy_from_user(&rhpt, argp, sizeof(rhpt)))
5858 r = kvm_vm_ioctl_resize_hpt_commit(kvm, &rhpt);
5870 * List of hcall numbers to enable by default.
5871 * For compatibility with old userspace, we enable by default
5872 * all hcalls that were implemented before the hcall-enabling
5873 * facility was added. Note this list should not include H_RTAS.
5875 static unsigned int default_hcall_list[] = {
5881 #ifdef CONFIG_SPAPR_TCE_IOMMU
5891 #ifdef CONFIG_KVM_XICS
5902 static void init_default_hcalls(void)
5907 for (i = 0; default_hcall_list[i]; ++i) {
5908 hcall = default_hcall_list[i];
5909 WARN_ON(!kvmppc_hcall_impl_hv(hcall));
5910 __set_bit(hcall / 4, default_enabled_hcalls);
5914 static int kvmhv_configure_mmu(struct kvm *kvm, struct kvm_ppc_mmuv3_cfg *cfg)
5920 /* If not on a POWER9, reject it */
5921 if (!cpu_has_feature(CPU_FTR_ARCH_300))
5924 /* If any unknown flags set, reject it */
5925 if (cfg->flags & ~(KVM_PPC_MMUV3_RADIX | KVM_PPC_MMUV3_GTSE))
5928 /* GR (guest radix) bit in process_table field must match */
5929 radix = !!(cfg->flags & KVM_PPC_MMUV3_RADIX);
5930 if (!!(cfg->process_table & PATB_GR) != radix)
5933 /* Process table size field must be reasonable, i.e. <= 24 */
5934 if ((cfg->process_table & PRTS_MASK) > 24)
5937 /* We can change a guest to/from radix now, if the host is radix */
5938 if (radix && !radix_enabled())
5941 /* If we're a nested hypervisor, we currently only support radix */
5942 if (kvmhv_on_pseries() && !radix)
5945 mutex_lock(&kvm->arch.mmu_setup_lock);
5946 if (radix != kvm_is_radix(kvm)) {
5947 if (kvm->arch.mmu_ready) {
5948 kvm->arch.mmu_ready = 0;
5949 /* order mmu_ready vs. vcpus_running */
5951 if (atomic_read(&kvm->arch.vcpus_running)) {
5952 kvm->arch.mmu_ready = 1;
5958 err = kvmppc_switch_mmu_to_radix(kvm);
5960 err = kvmppc_switch_mmu_to_hpt(kvm);
5965 kvm->arch.process_table = cfg->process_table;
5966 kvmppc_setup_partition_table(kvm);
5968 lpcr = (cfg->flags & KVM_PPC_MMUV3_GTSE) ? LPCR_GTSE : 0;
5969 kvmppc_update_lpcr(kvm, lpcr, LPCR_GTSE);
5973 mutex_unlock(&kvm->arch.mmu_setup_lock);
5977 static int kvmhv_enable_nested(struct kvm *kvm)
5981 if (!cpu_has_feature(CPU_FTR_ARCH_300))
5983 if (!radix_enabled())
5986 /* kvm == NULL means the caller is testing if the capability exists */
5988 kvm->arch.nested_enable = true;
5992 static int kvmhv_load_from_eaddr(struct kvm_vcpu *vcpu, ulong *eaddr, void *ptr,
5997 if (kvmhv_vcpu_is_radix(vcpu)) {
5998 rc = kvmhv_copy_from_guest_radix(vcpu, *eaddr, ptr, size);
6004 /* For now quadrants are the only way to access nested guest memory */
6005 if (rc && vcpu->arch.nested)
6011 static int kvmhv_store_to_eaddr(struct kvm_vcpu *vcpu, ulong *eaddr, void *ptr,
6016 if (kvmhv_vcpu_is_radix(vcpu)) {
6017 rc = kvmhv_copy_to_guest_radix(vcpu, *eaddr, ptr, size);
6023 /* For now quadrants are the only way to access nested guest memory */
6024 if (rc && vcpu->arch.nested)
6030 static void unpin_vpa_reset(struct kvm *kvm, struct kvmppc_vpa *vpa)
6032 unpin_vpa(kvm, vpa);
6034 vpa->pinned_addr = NULL;
6036 vpa->update_pending = 0;
6040 * Enable a guest to become a secure VM, or test whether
6041 * that could be enabled.
6042 * Called when the KVM_CAP_PPC_SECURE_GUEST capability is
6043 * tested (kvm == NULL) or enabled (kvm != NULL).
6045 static int kvmhv_enable_svm(struct kvm *kvm)
6047 if (!kvmppc_uvmem_available())
6050 kvm->arch.svm_enabled = 1;
6055 * IOCTL handler to turn off secure mode of guest
6057 * - Release all device pages
6058 * - Issue ucall to terminate the guest on the UV side
6059 * - Unpin the VPA pages.
6060 * - Reinit the partition scoped page tables
6062 static int kvmhv_svm_off(struct kvm *kvm)
6064 struct kvm_vcpu *vcpu;
6070 if (!(kvm->arch.secure_guest & KVMPPC_SECURE_INIT_START))
6073 mutex_lock(&kvm->arch.mmu_setup_lock);
6074 mmu_was_ready = kvm->arch.mmu_ready;
6075 if (kvm->arch.mmu_ready) {
6076 kvm->arch.mmu_ready = 0;
6077 /* order mmu_ready vs. vcpus_running */
6079 if (atomic_read(&kvm->arch.vcpus_running)) {
6080 kvm->arch.mmu_ready = 1;
6086 srcu_idx = srcu_read_lock(&kvm->srcu);
6087 for (i = 0; i < KVM_ADDRESS_SPACE_NUM; i++) {
6088 struct kvm_memory_slot *memslot;
6089 struct kvm_memslots *slots = __kvm_memslots(kvm, i);
6095 kvm_for_each_memslot(memslot, bkt, slots) {
6096 kvmppc_uvmem_drop_pages(memslot, kvm, true);
6097 uv_unregister_mem_slot(kvm->arch.lpid, memslot->id);
6100 srcu_read_unlock(&kvm->srcu, srcu_idx);
6102 ret = uv_svm_terminate(kvm->arch.lpid);
6103 if (ret != U_SUCCESS) {
6109 * When secure guest is reset, all the guest pages are sent
6110 * to UV via UV_PAGE_IN before the non-boot vcpus get a
6111 * chance to run and unpin their VPA pages. Unpinning of all
6112 * VPA pages is done here explicitly so that VPA pages
6113 * can be migrated to the secure side.
6115 * This is required to for the secure SMP guest to reboot
6118 kvm_for_each_vcpu(i, vcpu, kvm) {
6119 spin_lock(&vcpu->arch.vpa_update_lock);
6120 unpin_vpa_reset(kvm, &vcpu->arch.dtl);
6121 unpin_vpa_reset(kvm, &vcpu->arch.slb_shadow);
6122 unpin_vpa_reset(kvm, &vcpu->arch.vpa);
6123 spin_unlock(&vcpu->arch.vpa_update_lock);
6126 kvmppc_setup_partition_table(kvm);
6127 kvm->arch.secure_guest = 0;
6128 kvm->arch.mmu_ready = mmu_was_ready;
6130 mutex_unlock(&kvm->arch.mmu_setup_lock);
6134 static int kvmhv_enable_dawr1(struct kvm *kvm)
6136 if (!cpu_has_feature(CPU_FTR_DAWR1))
6139 /* kvm == NULL means the caller is testing if the capability exists */
6141 kvm->arch.dawr1_enabled = true;
6145 static bool kvmppc_hash_v3_possible(void)
6147 if (!cpu_has_feature(CPU_FTR_ARCH_300))
6150 if (!cpu_has_feature(CPU_FTR_HVMODE))
6154 * POWER9 chips before version 2.02 can't have some threads in
6155 * HPT mode and some in radix mode on the same core.
6157 if (radix_enabled()) {
6158 unsigned int pvr = mfspr(SPRN_PVR);
6159 if ((pvr >> 16) == PVR_POWER9 &&
6160 (((pvr & 0xe000) == 0 && (pvr & 0xfff) < 0x202) ||
6161 ((pvr & 0xe000) == 0x2000 && (pvr & 0xfff) < 0x101)))
6168 static struct kvmppc_ops kvm_ops_hv = {
6169 .get_sregs = kvm_arch_vcpu_ioctl_get_sregs_hv,
6170 .set_sregs = kvm_arch_vcpu_ioctl_set_sregs_hv,
6171 .get_one_reg = kvmppc_get_one_reg_hv,
6172 .set_one_reg = kvmppc_set_one_reg_hv,
6173 .vcpu_load = kvmppc_core_vcpu_load_hv,
6174 .vcpu_put = kvmppc_core_vcpu_put_hv,
6175 .inject_interrupt = kvmppc_inject_interrupt_hv,
6176 .set_msr = kvmppc_set_msr_hv,
6177 .vcpu_run = kvmppc_vcpu_run_hv,
6178 .vcpu_create = kvmppc_core_vcpu_create_hv,
6179 .vcpu_free = kvmppc_core_vcpu_free_hv,
6180 .check_requests = kvmppc_core_check_requests_hv,
6181 .get_dirty_log = kvm_vm_ioctl_get_dirty_log_hv,
6182 .flush_memslot = kvmppc_core_flush_memslot_hv,
6183 .prepare_memory_region = kvmppc_core_prepare_memory_region_hv,
6184 .commit_memory_region = kvmppc_core_commit_memory_region_hv,
6185 .unmap_gfn_range = kvm_unmap_gfn_range_hv,
6186 .age_gfn = kvm_age_gfn_hv,
6187 .test_age_gfn = kvm_test_age_gfn_hv,
6188 .set_spte_gfn = kvm_set_spte_gfn_hv,
6189 .free_memslot = kvmppc_core_free_memslot_hv,
6190 .init_vm = kvmppc_core_init_vm_hv,
6191 .destroy_vm = kvmppc_core_destroy_vm_hv,
6192 .get_smmu_info = kvm_vm_ioctl_get_smmu_info_hv,
6193 .emulate_op = kvmppc_core_emulate_op_hv,
6194 .emulate_mtspr = kvmppc_core_emulate_mtspr_hv,
6195 .emulate_mfspr = kvmppc_core_emulate_mfspr_hv,
6196 .fast_vcpu_kick = kvmppc_fast_vcpu_kick_hv,
6197 .arch_vm_ioctl = kvm_arch_vm_ioctl_hv,
6198 .hcall_implemented = kvmppc_hcall_impl_hv,
6199 #ifdef CONFIG_KVM_XICS
6200 .irq_bypass_add_producer = kvmppc_irq_bypass_add_producer_hv,
6201 .irq_bypass_del_producer = kvmppc_irq_bypass_del_producer_hv,
6203 .configure_mmu = kvmhv_configure_mmu,
6204 .get_rmmu_info = kvmhv_get_rmmu_info,
6205 .set_smt_mode = kvmhv_set_smt_mode,
6206 .enable_nested = kvmhv_enable_nested,
6207 .load_from_eaddr = kvmhv_load_from_eaddr,
6208 .store_to_eaddr = kvmhv_store_to_eaddr,
6209 .enable_svm = kvmhv_enable_svm,
6210 .svm_off = kvmhv_svm_off,
6211 .enable_dawr1 = kvmhv_enable_dawr1,
6212 .hash_v3_possible = kvmppc_hash_v3_possible,
6213 .create_vcpu_debugfs = kvmppc_arch_create_vcpu_debugfs_hv,
6214 .create_vm_debugfs = kvmppc_arch_create_vm_debugfs_hv,
6217 static int kvm_init_subcore_bitmap(void)
6220 int nr_cores = cpu_nr_cores();
6221 struct sibling_subcore_state *sibling_subcore_state;
6223 for (i = 0; i < nr_cores; i++) {
6224 int first_cpu = i * threads_per_core;
6225 int node = cpu_to_node(first_cpu);
6227 /* Ignore if it is already allocated. */
6228 if (paca_ptrs[first_cpu]->sibling_subcore_state)
6231 sibling_subcore_state =
6232 kzalloc_node(sizeof(struct sibling_subcore_state),
6234 if (!sibling_subcore_state)
6238 for (j = 0; j < threads_per_core; j++) {
6239 int cpu = first_cpu + j;
6241 paca_ptrs[cpu]->sibling_subcore_state =
6242 sibling_subcore_state;
6248 static int kvmppc_radix_possible(void)
6250 return cpu_has_feature(CPU_FTR_ARCH_300) && radix_enabled();
6253 static int kvmppc_book3s_init_hv(void)
6257 if (!tlbie_capable) {
6258 pr_err("KVM-HV: Host does not support TLBIE\n");
6263 * FIXME!! Do we need to check on all cpus ?
6265 r = kvmppc_core_check_processor_compat_hv();
6269 r = kvmhv_nested_init();
6273 if (!cpu_has_feature(CPU_FTR_ARCH_300)) {
6274 r = kvm_init_subcore_bitmap();
6280 * We need a way of accessing the XICS interrupt controller,
6281 * either directly, via paca_ptrs[cpu]->kvm_hstate.xics_phys, or
6282 * indirectly, via OPAL.
6285 if (!xics_on_xive() && !kvmhv_on_pseries() &&
6286 !local_paca->kvm_hstate.xics_phys) {
6287 struct device_node *np;
6289 np = of_find_compatible_node(NULL, NULL, "ibm,opal-intc");
6291 pr_err("KVM-HV: Cannot determine method for accessing XICS\n");
6295 /* presence of intc confirmed - node can be dropped again */
6300 init_default_hcalls();
6304 r = kvmppc_mmu_hv_init();
6308 if (kvmppc_radix_possible()) {
6309 r = kvmppc_radix_init();
6314 r = kvmppc_uvmem_init();
6316 pr_err("KVM-HV: kvmppc_uvmem_init failed %d\n", r);
6320 kvm_ops_hv.owner = THIS_MODULE;
6321 kvmppc_hv_ops = &kvm_ops_hv;
6326 kvmhv_nested_exit();
6327 kvmppc_radix_exit();
6332 static void kvmppc_book3s_exit_hv(void)
6334 kvmppc_uvmem_free();
6335 kvmppc_free_host_rm_ops();
6336 if (kvmppc_radix_possible())
6337 kvmppc_radix_exit();
6338 kvmppc_hv_ops = NULL;
6339 kvmhv_nested_exit();
6342 module_init(kvmppc_book3s_init_hv);
6343 module_exit(kvmppc_book3s_exit_hv);
6344 MODULE_LICENSE("GPL");
6345 MODULE_ALIAS_MISCDEV(KVM_MINOR);
6346 MODULE_ALIAS("devname:kvm");