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>
46 #include <asm/ftrace.h>
48 #include <asm/ppc-opcode.h>
49 #include <asm/asm-prototypes.h>
50 #include <asm/archrandom.h>
51 #include <asm/debug.h>
52 #include <asm/disassemble.h>
53 #include <asm/cputable.h>
54 #include <asm/cacheflush.h>
55 #include <linux/uaccess.h>
57 #include <asm/kvm_ppc.h>
58 #include <asm/kvm_book3s.h>
59 #include <asm/mmu_context.h>
60 #include <asm/lppaca.h>
62 #include <asm/processor.h>
63 #include <asm/cputhreads.h>
65 #include <asm/hvcall.h>
66 #include <asm/switch_to.h>
68 #include <asm/dbell.h>
70 #include <asm/pnv-pci.h>
75 #include <asm/hw_breakpoint.h>
79 #define CREATE_TRACE_POINTS
82 /* #define EXIT_DEBUG */
83 /* #define EXIT_DEBUG_SIMPLE */
84 /* #define EXIT_DEBUG_INT */
86 /* Used to indicate that a guest page fault needs to be handled */
87 #define RESUME_PAGE_FAULT (RESUME_GUEST | RESUME_FLAG_ARCH1)
88 /* Used to indicate that a guest passthrough interrupt needs to be handled */
89 #define RESUME_PASSTHROUGH (RESUME_GUEST | RESUME_FLAG_ARCH2)
91 /* Used as a "null" value for timebase values */
92 #define TB_NIL (~(u64)0)
94 static DECLARE_BITMAP(default_enabled_hcalls, MAX_HCALL_OPCODE/4 + 1);
96 static int dynamic_mt_modes = 6;
97 module_param(dynamic_mt_modes, int, 0644);
98 MODULE_PARM_DESC(dynamic_mt_modes, "Set of allowed dynamic micro-threading modes: 0 (= none), 2, 4, or 6 (= 2 or 4)");
99 static int target_smt_mode;
100 module_param(target_smt_mode, int, 0644);
101 MODULE_PARM_DESC(target_smt_mode, "Target threads per core (0 = max)");
103 static bool indep_threads_mode = true;
104 module_param(indep_threads_mode, bool, S_IRUGO | S_IWUSR);
105 MODULE_PARM_DESC(indep_threads_mode, "Independent-threads mode (only on POWER9)");
107 static bool one_vm_per_core;
108 module_param(one_vm_per_core, bool, S_IRUGO | S_IWUSR);
109 MODULE_PARM_DESC(one_vm_per_core, "Only run vCPUs from the same VM on a core (requires indep_threads_mode=N)");
111 #ifdef CONFIG_KVM_XICS
112 static struct kernel_param_ops module_param_ops = {
113 .set = param_set_int,
114 .get = param_get_int,
117 module_param_cb(kvm_irq_bypass, &module_param_ops, &kvm_irq_bypass, 0644);
118 MODULE_PARM_DESC(kvm_irq_bypass, "Bypass passthrough interrupt optimization");
120 module_param_cb(h_ipi_redirect, &module_param_ops, &h_ipi_redirect, 0644);
121 MODULE_PARM_DESC(h_ipi_redirect, "Redirect H_IPI wakeup to a free host core");
124 /* If set, guests are allowed to create and control nested guests */
125 static bool nested = true;
126 module_param(nested, bool, S_IRUGO | S_IWUSR);
127 MODULE_PARM_DESC(nested, "Enable nested virtualization (only on POWER9)");
129 static inline bool nesting_enabled(struct kvm *kvm)
131 return kvm->arch.nested_enable && kvm_is_radix(kvm);
134 /* If set, the threads on each CPU core have to be in the same MMU mode */
135 static bool no_mixing_hpt_and_radix;
137 static void kvmppc_end_cede(struct kvm_vcpu *vcpu);
138 static int kvmppc_hv_setup_htab_rma(struct kvm_vcpu *vcpu);
141 * RWMR values for POWER8. These control the rate at which PURR
142 * and SPURR count and should be set according to the number of
143 * online threads in the vcore being run.
145 #define RWMR_RPA_P8_1THREAD 0x164520C62609AECAUL
146 #define RWMR_RPA_P8_2THREAD 0x7FFF2908450D8DA9UL
147 #define RWMR_RPA_P8_3THREAD 0x164520C62609AECAUL
148 #define RWMR_RPA_P8_4THREAD 0x199A421245058DA9UL
149 #define RWMR_RPA_P8_5THREAD 0x164520C62609AECAUL
150 #define RWMR_RPA_P8_6THREAD 0x164520C62609AECAUL
151 #define RWMR_RPA_P8_7THREAD 0x164520C62609AECAUL
152 #define RWMR_RPA_P8_8THREAD 0x164520C62609AECAUL
154 static unsigned long p8_rwmr_values[MAX_SMT_THREADS + 1] = {
166 static inline struct kvm_vcpu *next_runnable_thread(struct kvmppc_vcore *vc,
170 struct kvm_vcpu *vcpu;
172 while (++i < MAX_SMT_THREADS) {
173 vcpu = READ_ONCE(vc->runnable_threads[i]);
182 /* Used to traverse the list of runnable threads for a given vcore */
183 #define for_each_runnable_thread(i, vcpu, vc) \
184 for (i = -1; (vcpu = next_runnable_thread(vc, &i)); )
186 static bool kvmppc_ipi_thread(int cpu)
188 unsigned long msg = PPC_DBELL_TYPE(PPC_DBELL_SERVER);
190 /* If we're a nested hypervisor, fall back to ordinary IPIs for now */
191 if (kvmhv_on_pseries())
194 /* On POWER9 we can use msgsnd to IPI any cpu */
195 if (cpu_has_feature(CPU_FTR_ARCH_300)) {
196 msg |= get_hard_smp_processor_id(cpu);
198 __asm__ __volatile__ (PPC_MSGSND(%0) : : "r" (msg));
202 /* On POWER8 for IPIs to threads in the same core, use msgsnd */
203 if (cpu_has_feature(CPU_FTR_ARCH_207S)) {
205 if (cpu_first_thread_sibling(cpu) ==
206 cpu_first_thread_sibling(smp_processor_id())) {
207 msg |= cpu_thread_in_core(cpu);
209 __asm__ __volatile__ (PPC_MSGSND(%0) : : "r" (msg));
216 #if defined(CONFIG_PPC_ICP_NATIVE) && defined(CONFIG_SMP)
217 if (cpu >= 0 && cpu < nr_cpu_ids) {
218 if (paca_ptrs[cpu]->kvm_hstate.xics_phys) {
222 opal_int_set_mfrr(get_hard_smp_processor_id(cpu), IPI_PRIORITY);
230 static void kvmppc_fast_vcpu_kick_hv(struct kvm_vcpu *vcpu)
233 struct swait_queue_head *wqp;
235 wqp = kvm_arch_vcpu_wq(vcpu);
236 if (swq_has_sleeper(wqp)) {
238 ++vcpu->stat.halt_wakeup;
241 cpu = READ_ONCE(vcpu->arch.thread_cpu);
242 if (cpu >= 0 && kvmppc_ipi_thread(cpu))
245 /* CPU points to the first thread of the core */
247 if (cpu >= 0 && cpu < nr_cpu_ids && cpu_online(cpu))
248 smp_send_reschedule(cpu);
252 * We use the vcpu_load/put functions to measure stolen time.
253 * Stolen time is counted as time when either the vcpu is able to
254 * run as part of a virtual core, but the task running the vcore
255 * is preempted or sleeping, or when the vcpu needs something done
256 * in the kernel by the task running the vcpu, but that task is
257 * preempted or sleeping. Those two things have to be counted
258 * separately, since one of the vcpu tasks will take on the job
259 * of running the core, and the other vcpu tasks in the vcore will
260 * sleep waiting for it to do that, but that sleep shouldn't count
263 * Hence we accumulate stolen time when the vcpu can run as part of
264 * a vcore using vc->stolen_tb, and the stolen time when the vcpu
265 * needs its task to do other things in the kernel (for example,
266 * service a page fault) in busy_stolen. We don't accumulate
267 * stolen time for a vcore when it is inactive, or for a vcpu
268 * when it is in state RUNNING or NOTREADY. NOTREADY is a bit of
269 * a misnomer; it means that the vcpu task is not executing in
270 * the KVM_VCPU_RUN ioctl, i.e. it is in userspace or elsewhere in
271 * the kernel. We don't have any way of dividing up that time
272 * between time that the vcpu is genuinely stopped, time that
273 * the task is actively working on behalf of the vcpu, and time
274 * that the task is preempted, so we don't count any of it as
277 * Updates to busy_stolen are protected by arch.tbacct_lock;
278 * updates to vc->stolen_tb are protected by the vcore->stoltb_lock
279 * lock. The stolen times are measured in units of timebase ticks.
280 * (Note that the != TB_NIL checks below are purely defensive;
281 * they should never fail.)
284 static void kvmppc_core_start_stolen(struct kvmppc_vcore *vc)
288 spin_lock_irqsave(&vc->stoltb_lock, flags);
289 vc->preempt_tb = mftb();
290 spin_unlock_irqrestore(&vc->stoltb_lock, flags);
293 static void kvmppc_core_end_stolen(struct kvmppc_vcore *vc)
297 spin_lock_irqsave(&vc->stoltb_lock, flags);
298 if (vc->preempt_tb != TB_NIL) {
299 vc->stolen_tb += mftb() - vc->preempt_tb;
300 vc->preempt_tb = TB_NIL;
302 spin_unlock_irqrestore(&vc->stoltb_lock, flags);
305 static void kvmppc_core_vcpu_load_hv(struct kvm_vcpu *vcpu, int cpu)
307 struct kvmppc_vcore *vc = vcpu->arch.vcore;
311 * We can test vc->runner without taking the vcore lock,
312 * because only this task ever sets vc->runner to this
313 * vcpu, and once it is set to this vcpu, only this task
314 * ever sets it to NULL.
316 if (vc->runner == vcpu && vc->vcore_state >= VCORE_SLEEPING)
317 kvmppc_core_end_stolen(vc);
319 spin_lock_irqsave(&vcpu->arch.tbacct_lock, flags);
320 if (vcpu->arch.state == KVMPPC_VCPU_BUSY_IN_HOST &&
321 vcpu->arch.busy_preempt != TB_NIL) {
322 vcpu->arch.busy_stolen += mftb() - vcpu->arch.busy_preempt;
323 vcpu->arch.busy_preempt = TB_NIL;
325 spin_unlock_irqrestore(&vcpu->arch.tbacct_lock, flags);
328 static void kvmppc_core_vcpu_put_hv(struct kvm_vcpu *vcpu)
330 struct kvmppc_vcore *vc = vcpu->arch.vcore;
333 if (vc->runner == vcpu && vc->vcore_state >= VCORE_SLEEPING)
334 kvmppc_core_start_stolen(vc);
336 spin_lock_irqsave(&vcpu->arch.tbacct_lock, flags);
337 if (vcpu->arch.state == KVMPPC_VCPU_BUSY_IN_HOST)
338 vcpu->arch.busy_preempt = mftb();
339 spin_unlock_irqrestore(&vcpu->arch.tbacct_lock, flags);
342 static void kvmppc_set_msr_hv(struct kvm_vcpu *vcpu, u64 msr)
345 * Check for illegal transactional state bit combination
346 * and if we find it, force the TS field to a safe state.
348 if ((msr & MSR_TS_MASK) == MSR_TS_MASK)
350 vcpu->arch.shregs.msr = msr;
351 kvmppc_end_cede(vcpu);
354 static void kvmppc_set_pvr_hv(struct kvm_vcpu *vcpu, u32 pvr)
356 vcpu->arch.pvr = pvr;
359 /* Dummy value used in computing PCR value below */
360 #define PCR_ARCH_300 (PCR_ARCH_207 << 1)
362 static int kvmppc_set_arch_compat(struct kvm_vcpu *vcpu, u32 arch_compat)
364 unsigned long host_pcr_bit = 0, guest_pcr_bit = 0;
365 struct kvmppc_vcore *vc = vcpu->arch.vcore;
367 /* We can (emulate) our own architecture version and anything older */
368 if (cpu_has_feature(CPU_FTR_ARCH_300))
369 host_pcr_bit = PCR_ARCH_300;
370 else if (cpu_has_feature(CPU_FTR_ARCH_207S))
371 host_pcr_bit = PCR_ARCH_207;
372 else if (cpu_has_feature(CPU_FTR_ARCH_206))
373 host_pcr_bit = PCR_ARCH_206;
375 host_pcr_bit = PCR_ARCH_205;
377 /* Determine lowest PCR bit needed to run guest in given PVR level */
378 guest_pcr_bit = host_pcr_bit;
380 switch (arch_compat) {
382 guest_pcr_bit = PCR_ARCH_205;
386 guest_pcr_bit = PCR_ARCH_206;
389 guest_pcr_bit = PCR_ARCH_207;
392 guest_pcr_bit = PCR_ARCH_300;
399 /* Check requested PCR bits don't exceed our capabilities */
400 if (guest_pcr_bit > host_pcr_bit)
403 spin_lock(&vc->lock);
404 vc->arch_compat = arch_compat;
406 * Set all PCR bits for which guest_pcr_bit <= bit < host_pcr_bit
407 * Also set all reserved PCR bits
409 vc->pcr = (host_pcr_bit - guest_pcr_bit) | PCR_MASK;
410 spin_unlock(&vc->lock);
415 static void kvmppc_dump_regs(struct kvm_vcpu *vcpu)
419 pr_err("vcpu %p (%d):\n", vcpu, vcpu->vcpu_id);
420 pr_err("pc = %.16lx msr = %.16llx trap = %x\n",
421 vcpu->arch.regs.nip, vcpu->arch.shregs.msr, vcpu->arch.trap);
422 for (r = 0; r < 16; ++r)
423 pr_err("r%2d = %.16lx r%d = %.16lx\n",
424 r, kvmppc_get_gpr(vcpu, r),
425 r+16, kvmppc_get_gpr(vcpu, r+16));
426 pr_err("ctr = %.16lx lr = %.16lx\n",
427 vcpu->arch.regs.ctr, vcpu->arch.regs.link);
428 pr_err("srr0 = %.16llx srr1 = %.16llx\n",
429 vcpu->arch.shregs.srr0, vcpu->arch.shregs.srr1);
430 pr_err("sprg0 = %.16llx sprg1 = %.16llx\n",
431 vcpu->arch.shregs.sprg0, vcpu->arch.shregs.sprg1);
432 pr_err("sprg2 = %.16llx sprg3 = %.16llx\n",
433 vcpu->arch.shregs.sprg2, vcpu->arch.shregs.sprg3);
434 pr_err("cr = %.8lx xer = %.16lx dsisr = %.8x\n",
435 vcpu->arch.regs.ccr, vcpu->arch.regs.xer, vcpu->arch.shregs.dsisr);
436 pr_err("dar = %.16llx\n", vcpu->arch.shregs.dar);
437 pr_err("fault dar = %.16lx dsisr = %.8x\n",
438 vcpu->arch.fault_dar, vcpu->arch.fault_dsisr);
439 pr_err("SLB (%d entries):\n", vcpu->arch.slb_max);
440 for (r = 0; r < vcpu->arch.slb_max; ++r)
441 pr_err(" ESID = %.16llx VSID = %.16llx\n",
442 vcpu->arch.slb[r].orige, vcpu->arch.slb[r].origv);
443 pr_err("lpcr = %.16lx sdr1 = %.16lx last_inst = %.8x\n",
444 vcpu->arch.vcore->lpcr, vcpu->kvm->arch.sdr1,
445 vcpu->arch.last_inst);
448 static struct kvm_vcpu *kvmppc_find_vcpu(struct kvm *kvm, int id)
450 return kvm_get_vcpu_by_id(kvm, id);
453 static void init_vpa(struct kvm_vcpu *vcpu, struct lppaca *vpa)
455 vpa->__old_status |= LPPACA_OLD_SHARED_PROC;
456 vpa->yield_count = cpu_to_be32(1);
459 static int set_vpa(struct kvm_vcpu *vcpu, struct kvmppc_vpa *v,
460 unsigned long addr, unsigned long len)
462 /* check address is cacheline aligned */
463 if (addr & (L1_CACHE_BYTES - 1))
465 spin_lock(&vcpu->arch.vpa_update_lock);
466 if (v->next_gpa != addr || v->len != len) {
468 v->len = addr ? len : 0;
469 v->update_pending = 1;
471 spin_unlock(&vcpu->arch.vpa_update_lock);
475 /* Length for a per-processor buffer is passed in at offset 4 in the buffer */
484 static int vpa_is_registered(struct kvmppc_vpa *vpap)
486 if (vpap->update_pending)
487 return vpap->next_gpa != 0;
488 return vpap->pinned_addr != NULL;
491 static unsigned long do_h_register_vpa(struct kvm_vcpu *vcpu,
493 unsigned long vcpuid, unsigned long vpa)
495 struct kvm *kvm = vcpu->kvm;
496 unsigned long len, nb;
498 struct kvm_vcpu *tvcpu;
501 struct kvmppc_vpa *vpap;
503 tvcpu = kvmppc_find_vcpu(kvm, vcpuid);
507 subfunc = (flags >> H_VPA_FUNC_SHIFT) & H_VPA_FUNC_MASK;
508 if (subfunc == H_VPA_REG_VPA || subfunc == H_VPA_REG_DTL ||
509 subfunc == H_VPA_REG_SLB) {
510 /* Registering new area - address must be cache-line aligned */
511 if ((vpa & (L1_CACHE_BYTES - 1)) || !vpa)
514 /* convert logical addr to kernel addr and read length */
515 va = kvmppc_pin_guest_page(kvm, vpa, &nb);
518 if (subfunc == H_VPA_REG_VPA)
519 len = be16_to_cpu(((struct reg_vpa *)va)->length.hword);
521 len = be32_to_cpu(((struct reg_vpa *)va)->length.word);
522 kvmppc_unpin_guest_page(kvm, va, vpa, false);
525 if (len > nb || len < sizeof(struct reg_vpa))
534 spin_lock(&tvcpu->arch.vpa_update_lock);
537 case H_VPA_REG_VPA: /* register VPA */
539 * The size of our lppaca is 1kB because of the way we align
540 * it for the guest to avoid crossing a 4kB boundary. We only
541 * use 640 bytes of the structure though, so we should accept
542 * clients that set a size of 640.
544 BUILD_BUG_ON(sizeof(struct lppaca) != 640);
545 if (len < sizeof(struct lppaca))
547 vpap = &tvcpu->arch.vpa;
551 case H_VPA_REG_DTL: /* register DTL */
552 if (len < sizeof(struct dtl_entry))
554 len -= len % sizeof(struct dtl_entry);
556 /* Check that they have previously registered a VPA */
558 if (!vpa_is_registered(&tvcpu->arch.vpa))
561 vpap = &tvcpu->arch.dtl;
565 case H_VPA_REG_SLB: /* register SLB shadow buffer */
566 /* Check that they have previously registered a VPA */
568 if (!vpa_is_registered(&tvcpu->arch.vpa))
571 vpap = &tvcpu->arch.slb_shadow;
575 case H_VPA_DEREG_VPA: /* deregister VPA */
576 /* Check they don't still have a DTL or SLB buf registered */
578 if (vpa_is_registered(&tvcpu->arch.dtl) ||
579 vpa_is_registered(&tvcpu->arch.slb_shadow))
582 vpap = &tvcpu->arch.vpa;
586 case H_VPA_DEREG_DTL: /* deregister DTL */
587 vpap = &tvcpu->arch.dtl;
591 case H_VPA_DEREG_SLB: /* deregister SLB shadow buffer */
592 vpap = &tvcpu->arch.slb_shadow;
598 vpap->next_gpa = vpa;
600 vpap->update_pending = 1;
603 spin_unlock(&tvcpu->arch.vpa_update_lock);
608 static void kvmppc_update_vpa(struct kvm_vcpu *vcpu, struct kvmppc_vpa *vpap)
610 struct kvm *kvm = vcpu->kvm;
616 * We need to pin the page pointed to by vpap->next_gpa,
617 * but we can't call kvmppc_pin_guest_page under the lock
618 * as it does get_user_pages() and down_read(). So we
619 * have to drop the lock, pin the page, then get the lock
620 * again and check that a new area didn't get registered
624 gpa = vpap->next_gpa;
625 spin_unlock(&vcpu->arch.vpa_update_lock);
629 va = kvmppc_pin_guest_page(kvm, gpa, &nb);
630 spin_lock(&vcpu->arch.vpa_update_lock);
631 if (gpa == vpap->next_gpa)
633 /* sigh... unpin that one and try again */
635 kvmppc_unpin_guest_page(kvm, va, gpa, false);
638 vpap->update_pending = 0;
639 if (va && nb < vpap->len) {
641 * If it's now too short, it must be that userspace
642 * has changed the mappings underlying guest memory,
643 * so unregister the region.
645 kvmppc_unpin_guest_page(kvm, va, gpa, false);
648 if (vpap->pinned_addr)
649 kvmppc_unpin_guest_page(kvm, vpap->pinned_addr, vpap->gpa,
652 vpap->pinned_addr = va;
655 vpap->pinned_end = va + vpap->len;
658 static void kvmppc_update_vpas(struct kvm_vcpu *vcpu)
660 if (!(vcpu->arch.vpa.update_pending ||
661 vcpu->arch.slb_shadow.update_pending ||
662 vcpu->arch.dtl.update_pending))
665 spin_lock(&vcpu->arch.vpa_update_lock);
666 if (vcpu->arch.vpa.update_pending) {
667 kvmppc_update_vpa(vcpu, &vcpu->arch.vpa);
668 if (vcpu->arch.vpa.pinned_addr)
669 init_vpa(vcpu, vcpu->arch.vpa.pinned_addr);
671 if (vcpu->arch.dtl.update_pending) {
672 kvmppc_update_vpa(vcpu, &vcpu->arch.dtl);
673 vcpu->arch.dtl_ptr = vcpu->arch.dtl.pinned_addr;
674 vcpu->arch.dtl_index = 0;
676 if (vcpu->arch.slb_shadow.update_pending)
677 kvmppc_update_vpa(vcpu, &vcpu->arch.slb_shadow);
678 spin_unlock(&vcpu->arch.vpa_update_lock);
682 * Return the accumulated stolen time for the vcore up until `now'.
683 * The caller should hold the vcore lock.
685 static u64 vcore_stolen_time(struct kvmppc_vcore *vc, u64 now)
690 spin_lock_irqsave(&vc->stoltb_lock, flags);
692 if (vc->vcore_state != VCORE_INACTIVE &&
693 vc->preempt_tb != TB_NIL)
694 p += now - vc->preempt_tb;
695 spin_unlock_irqrestore(&vc->stoltb_lock, flags);
699 static void kvmppc_create_dtl_entry(struct kvm_vcpu *vcpu,
700 struct kvmppc_vcore *vc)
702 struct dtl_entry *dt;
704 unsigned long stolen;
705 unsigned long core_stolen;
709 dt = vcpu->arch.dtl_ptr;
710 vpa = vcpu->arch.vpa.pinned_addr;
712 core_stolen = vcore_stolen_time(vc, now);
713 stolen = core_stolen - vcpu->arch.stolen_logged;
714 vcpu->arch.stolen_logged = core_stolen;
715 spin_lock_irqsave(&vcpu->arch.tbacct_lock, flags);
716 stolen += vcpu->arch.busy_stolen;
717 vcpu->arch.busy_stolen = 0;
718 spin_unlock_irqrestore(&vcpu->arch.tbacct_lock, flags);
721 memset(dt, 0, sizeof(struct dtl_entry));
722 dt->dispatch_reason = 7;
723 dt->processor_id = cpu_to_be16(vc->pcpu + vcpu->arch.ptid);
724 dt->timebase = cpu_to_be64(now + vc->tb_offset);
725 dt->enqueue_to_dispatch_time = cpu_to_be32(stolen);
726 dt->srr0 = cpu_to_be64(kvmppc_get_pc(vcpu));
727 dt->srr1 = cpu_to_be64(vcpu->arch.shregs.msr);
729 if (dt == vcpu->arch.dtl.pinned_end)
730 dt = vcpu->arch.dtl.pinned_addr;
731 vcpu->arch.dtl_ptr = dt;
732 /* order writing *dt vs. writing vpa->dtl_idx */
734 vpa->dtl_idx = cpu_to_be64(++vcpu->arch.dtl_index);
735 vcpu->arch.dtl.dirty = true;
738 /* See if there is a doorbell interrupt pending for a vcpu */
739 static bool kvmppc_doorbell_pending(struct kvm_vcpu *vcpu)
742 struct kvmppc_vcore *vc;
744 if (vcpu->arch.doorbell_request)
747 * Ensure that the read of vcore->dpdes comes after the read
748 * of vcpu->doorbell_request. This barrier matches the
749 * smp_wmb() in kvmppc_guest_entry_inject().
752 vc = vcpu->arch.vcore;
753 thr = vcpu->vcpu_id - vc->first_vcpuid;
754 return !!(vc->dpdes & (1 << thr));
757 static bool kvmppc_power8_compatible(struct kvm_vcpu *vcpu)
759 if (vcpu->arch.vcore->arch_compat >= PVR_ARCH_207)
761 if ((!vcpu->arch.vcore->arch_compat) &&
762 cpu_has_feature(CPU_FTR_ARCH_207S))
767 static int kvmppc_h_set_mode(struct kvm_vcpu *vcpu, unsigned long mflags,
768 unsigned long resource, unsigned long value1,
769 unsigned long value2)
772 case H_SET_MODE_RESOURCE_SET_CIABR:
773 if (!kvmppc_power8_compatible(vcpu))
778 return H_UNSUPPORTED_FLAG_START;
779 /* Guests can't breakpoint the hypervisor */
780 if ((value1 & CIABR_PRIV) == CIABR_PRIV_HYPER)
782 vcpu->arch.ciabr = value1;
784 case H_SET_MODE_RESOURCE_SET_DAWR:
785 if (!kvmppc_power8_compatible(vcpu))
787 if (!ppc_breakpoint_available())
790 return H_UNSUPPORTED_FLAG_START;
791 if (value2 & DABRX_HYP)
793 vcpu->arch.dawr = value1;
794 vcpu->arch.dawrx = value2;
801 /* Copy guest memory in place - must reside within a single memslot */
802 static int kvmppc_copy_guest(struct kvm *kvm, gpa_t to, gpa_t from,
805 struct kvm_memory_slot *to_memslot = NULL;
806 struct kvm_memory_slot *from_memslot = NULL;
807 unsigned long to_addr, from_addr;
810 /* Get HPA for from address */
811 from_memslot = gfn_to_memslot(kvm, from >> PAGE_SHIFT);
814 if ((from + len) >= ((from_memslot->base_gfn + from_memslot->npages)
817 from_addr = gfn_to_hva_memslot(from_memslot, from >> PAGE_SHIFT);
818 if (kvm_is_error_hva(from_addr))
820 from_addr |= (from & (PAGE_SIZE - 1));
822 /* Get HPA for to address */
823 to_memslot = gfn_to_memslot(kvm, to >> PAGE_SHIFT);
826 if ((to + len) >= ((to_memslot->base_gfn + to_memslot->npages)
829 to_addr = gfn_to_hva_memslot(to_memslot, to >> PAGE_SHIFT);
830 if (kvm_is_error_hva(to_addr))
832 to_addr |= (to & (PAGE_SIZE - 1));
835 r = raw_copy_in_user((void __user *)to_addr, (void __user *)from_addr,
839 mark_page_dirty(kvm, to >> PAGE_SHIFT);
843 static long kvmppc_h_page_init(struct kvm_vcpu *vcpu, unsigned long flags,
844 unsigned long dest, unsigned long src)
846 u64 pg_sz = SZ_4K; /* 4K page size */
847 u64 pg_mask = SZ_4K - 1;
850 /* Check for invalid flags (H_PAGE_SET_LOANED covers all CMO flags) */
851 if (flags & ~(H_ICACHE_INVALIDATE | H_ICACHE_SYNCHRONIZE |
852 H_ZERO_PAGE | H_COPY_PAGE | H_PAGE_SET_LOANED))
855 /* dest (and src if copy_page flag set) must be page aligned */
856 if ((dest & pg_mask) || ((flags & H_COPY_PAGE) && (src & pg_mask)))
859 /* zero and/or copy the page as determined by the flags */
860 if (flags & H_COPY_PAGE) {
861 ret = kvmppc_copy_guest(vcpu->kvm, dest, src, pg_sz);
864 } else if (flags & H_ZERO_PAGE) {
865 ret = kvm_clear_guest(vcpu->kvm, dest, pg_sz);
870 /* We can ignore the remaining flags */
875 static int kvm_arch_vcpu_yield_to(struct kvm_vcpu *target)
877 struct kvmppc_vcore *vcore = target->arch.vcore;
880 * We expect to have been called by the real mode handler
881 * (kvmppc_rm_h_confer()) which would have directly returned
882 * H_SUCCESS if the source vcore wasn't idle (e.g. if it may
883 * have useful work to do and should not confer) so we don't
887 spin_lock(&vcore->lock);
888 if (target->arch.state == KVMPPC_VCPU_RUNNABLE &&
889 vcore->vcore_state != VCORE_INACTIVE &&
891 target = vcore->runner;
892 spin_unlock(&vcore->lock);
894 return kvm_vcpu_yield_to(target);
897 static int kvmppc_get_yield_count(struct kvm_vcpu *vcpu)
900 struct lppaca *lppaca;
902 spin_lock(&vcpu->arch.vpa_update_lock);
903 lppaca = (struct lppaca *)vcpu->arch.vpa.pinned_addr;
905 yield_count = be32_to_cpu(lppaca->yield_count);
906 spin_unlock(&vcpu->arch.vpa_update_lock);
910 int kvmppc_pseries_do_hcall(struct kvm_vcpu *vcpu)
912 unsigned long req = kvmppc_get_gpr(vcpu, 3);
913 unsigned long target, ret = H_SUCCESS;
915 struct kvm_vcpu *tvcpu;
918 if (req <= MAX_HCALL_OPCODE &&
919 !test_bit(req/4, vcpu->kvm->arch.enabled_hcalls))
926 target = kvmppc_get_gpr(vcpu, 4);
927 tvcpu = kvmppc_find_vcpu(vcpu->kvm, target);
932 tvcpu->arch.prodded = 1;
934 if (tvcpu->arch.ceded)
935 kvmppc_fast_vcpu_kick_hv(tvcpu);
938 target = kvmppc_get_gpr(vcpu, 4);
941 tvcpu = kvmppc_find_vcpu(vcpu->kvm, target);
946 yield_count = kvmppc_get_gpr(vcpu, 5);
947 if (kvmppc_get_yield_count(tvcpu) != yield_count)
949 kvm_arch_vcpu_yield_to(tvcpu);
952 ret = do_h_register_vpa(vcpu, kvmppc_get_gpr(vcpu, 4),
953 kvmppc_get_gpr(vcpu, 5),
954 kvmppc_get_gpr(vcpu, 6));
957 if (list_empty(&vcpu->kvm->arch.rtas_tokens))
960 idx = srcu_read_lock(&vcpu->kvm->srcu);
961 rc = kvmppc_rtas_hcall(vcpu);
962 srcu_read_unlock(&vcpu->kvm->srcu, idx);
969 /* Send the error out to userspace via KVM_RUN */
971 case H_LOGICAL_CI_LOAD:
972 ret = kvmppc_h_logical_ci_load(vcpu);
973 if (ret == H_TOO_HARD)
976 case H_LOGICAL_CI_STORE:
977 ret = kvmppc_h_logical_ci_store(vcpu);
978 if (ret == H_TOO_HARD)
982 ret = kvmppc_h_set_mode(vcpu, kvmppc_get_gpr(vcpu, 4),
983 kvmppc_get_gpr(vcpu, 5),
984 kvmppc_get_gpr(vcpu, 6),
985 kvmppc_get_gpr(vcpu, 7));
986 if (ret == H_TOO_HARD)
995 if (kvmppc_xics_enabled(vcpu)) {
996 if (xics_on_xive()) {
997 ret = H_NOT_AVAILABLE;
1000 ret = kvmppc_xics_hcall(vcpu, req);
1005 ret = kvmppc_h_set_dabr(vcpu, kvmppc_get_gpr(vcpu, 4));
1008 ret = kvmppc_h_set_xdabr(vcpu, kvmppc_get_gpr(vcpu, 4),
1009 kvmppc_get_gpr(vcpu, 5));
1011 #ifdef CONFIG_SPAPR_TCE_IOMMU
1013 ret = kvmppc_h_get_tce(vcpu, kvmppc_get_gpr(vcpu, 4),
1014 kvmppc_get_gpr(vcpu, 5));
1015 if (ret == H_TOO_HARD)
1019 ret = kvmppc_h_put_tce(vcpu, kvmppc_get_gpr(vcpu, 4),
1020 kvmppc_get_gpr(vcpu, 5),
1021 kvmppc_get_gpr(vcpu, 6));
1022 if (ret == H_TOO_HARD)
1025 case H_PUT_TCE_INDIRECT:
1026 ret = kvmppc_h_put_tce_indirect(vcpu, kvmppc_get_gpr(vcpu, 4),
1027 kvmppc_get_gpr(vcpu, 5),
1028 kvmppc_get_gpr(vcpu, 6),
1029 kvmppc_get_gpr(vcpu, 7));
1030 if (ret == H_TOO_HARD)
1034 ret = kvmppc_h_stuff_tce(vcpu, kvmppc_get_gpr(vcpu, 4),
1035 kvmppc_get_gpr(vcpu, 5),
1036 kvmppc_get_gpr(vcpu, 6),
1037 kvmppc_get_gpr(vcpu, 7));
1038 if (ret == H_TOO_HARD)
1043 if (!powernv_get_random_long(&vcpu->arch.regs.gpr[4]))
1047 case H_SET_PARTITION_TABLE:
1049 if (nesting_enabled(vcpu->kvm))
1050 ret = kvmhv_set_partition_table(vcpu);
1052 case H_ENTER_NESTED:
1054 if (!nesting_enabled(vcpu->kvm))
1056 ret = kvmhv_enter_nested_guest(vcpu);
1057 if (ret == H_INTERRUPT) {
1058 kvmppc_set_gpr(vcpu, 3, 0);
1059 vcpu->arch.hcall_needed = 0;
1061 } else if (ret == H_TOO_HARD) {
1062 kvmppc_set_gpr(vcpu, 3, 0);
1063 vcpu->arch.hcall_needed = 0;
1067 case H_TLB_INVALIDATE:
1069 if (nesting_enabled(vcpu->kvm))
1070 ret = kvmhv_do_nested_tlbie(vcpu);
1072 case H_COPY_TOFROM_GUEST:
1074 if (nesting_enabled(vcpu->kvm))
1075 ret = kvmhv_copy_tofrom_guest_nested(vcpu);
1078 ret = kvmppc_h_page_init(vcpu, kvmppc_get_gpr(vcpu, 4),
1079 kvmppc_get_gpr(vcpu, 5),
1080 kvmppc_get_gpr(vcpu, 6));
1085 kvmppc_set_gpr(vcpu, 3, ret);
1086 vcpu->arch.hcall_needed = 0;
1087 return RESUME_GUEST;
1091 * Handle H_CEDE in the nested virtualization case where we haven't
1092 * called the real-mode hcall handlers in book3s_hv_rmhandlers.S.
1093 * This has to be done early, not in kvmppc_pseries_do_hcall(), so
1094 * that the cede logic in kvmppc_run_single_vcpu() works properly.
1096 static void kvmppc_nested_cede(struct kvm_vcpu *vcpu)
1098 vcpu->arch.shregs.msr |= MSR_EE;
1099 vcpu->arch.ceded = 1;
1101 if (vcpu->arch.prodded) {
1102 vcpu->arch.prodded = 0;
1104 vcpu->arch.ceded = 0;
1108 static int kvmppc_hcall_impl_hv(unsigned long cmd)
1114 case H_REGISTER_VPA:
1116 case H_LOGICAL_CI_LOAD:
1117 case H_LOGICAL_CI_STORE:
1118 #ifdef CONFIG_KVM_XICS
1130 /* See if it's in the real-mode table */
1131 return kvmppc_hcall_impl_hv_realmode(cmd);
1134 static int kvmppc_emulate_debug_inst(struct kvm_run *run,
1135 struct kvm_vcpu *vcpu)
1139 if (kvmppc_get_last_inst(vcpu, INST_GENERIC, &last_inst) !=
1142 * Fetch failed, so return to guest and
1143 * try executing it again.
1145 return RESUME_GUEST;
1148 if (last_inst == KVMPPC_INST_SW_BREAKPOINT) {
1149 run->exit_reason = KVM_EXIT_DEBUG;
1150 run->debug.arch.address = kvmppc_get_pc(vcpu);
1153 kvmppc_core_queue_program(vcpu, SRR1_PROGILL);
1154 return RESUME_GUEST;
1158 static void do_nothing(void *x)
1162 static unsigned long kvmppc_read_dpdes(struct kvm_vcpu *vcpu)
1164 int thr, cpu, pcpu, nthreads;
1166 unsigned long dpdes;
1168 nthreads = vcpu->kvm->arch.emul_smt_mode;
1170 cpu = vcpu->vcpu_id & ~(nthreads - 1);
1171 for (thr = 0; thr < nthreads; ++thr, ++cpu) {
1172 v = kvmppc_find_vcpu(vcpu->kvm, cpu);
1176 * If the vcpu is currently running on a physical cpu thread,
1177 * interrupt it in order to pull it out of the guest briefly,
1178 * which will update its vcore->dpdes value.
1180 pcpu = READ_ONCE(v->cpu);
1182 smp_call_function_single(pcpu, do_nothing, NULL, 1);
1183 if (kvmppc_doorbell_pending(v))
1190 * On POWER9, emulate doorbell-related instructions in order to
1191 * give the guest the illusion of running on a multi-threaded core.
1192 * The instructions emulated are msgsndp, msgclrp, mfspr TIR,
1195 static int kvmppc_emulate_doorbell_instr(struct kvm_vcpu *vcpu)
1199 struct kvm *kvm = vcpu->kvm;
1200 struct kvm_vcpu *tvcpu;
1202 if (kvmppc_get_last_inst(vcpu, INST_GENERIC, &inst) != EMULATE_DONE)
1203 return RESUME_GUEST;
1204 if (get_op(inst) != 31)
1205 return EMULATE_FAIL;
1207 thr = vcpu->vcpu_id & (kvm->arch.emul_smt_mode - 1);
1208 switch (get_xop(inst)) {
1209 case OP_31_XOP_MSGSNDP:
1210 arg = kvmppc_get_gpr(vcpu, rb);
1211 if (((arg >> 27) & 0xf) != PPC_DBELL_SERVER)
1214 if (arg >= kvm->arch.emul_smt_mode)
1216 tvcpu = kvmppc_find_vcpu(kvm, vcpu->vcpu_id - thr + arg);
1219 if (!tvcpu->arch.doorbell_request) {
1220 tvcpu->arch.doorbell_request = 1;
1221 kvmppc_fast_vcpu_kick_hv(tvcpu);
1224 case OP_31_XOP_MSGCLRP:
1225 arg = kvmppc_get_gpr(vcpu, rb);
1226 if (((arg >> 27) & 0xf) != PPC_DBELL_SERVER)
1228 vcpu->arch.vcore->dpdes = 0;
1229 vcpu->arch.doorbell_request = 0;
1231 case OP_31_XOP_MFSPR:
1232 switch (get_sprn(inst)) {
1237 arg = kvmppc_read_dpdes(vcpu);
1240 return EMULATE_FAIL;
1242 kvmppc_set_gpr(vcpu, get_rt(inst), arg);
1245 return EMULATE_FAIL;
1247 kvmppc_set_pc(vcpu, kvmppc_get_pc(vcpu) + 4);
1248 return RESUME_GUEST;
1251 static int kvmppc_handle_exit_hv(struct kvm_run *run, struct kvm_vcpu *vcpu,
1252 struct task_struct *tsk)
1254 int r = RESUME_HOST;
1256 vcpu->stat.sum_exits++;
1259 * This can happen if an interrupt occurs in the last stages
1260 * of guest entry or the first stages of guest exit (i.e. after
1261 * setting paca->kvm_hstate.in_guest to KVM_GUEST_MODE_GUEST_HV
1262 * and before setting it to KVM_GUEST_MODE_HOST_HV).
1263 * That can happen due to a bug, or due to a machine check
1264 * occurring at just the wrong time.
1266 if (vcpu->arch.shregs.msr & MSR_HV) {
1267 printk(KERN_EMERG "KVM trap in HV mode!\n");
1268 printk(KERN_EMERG "trap=0x%x | pc=0x%lx | msr=0x%llx\n",
1269 vcpu->arch.trap, kvmppc_get_pc(vcpu),
1270 vcpu->arch.shregs.msr);
1271 kvmppc_dump_regs(vcpu);
1272 run->exit_reason = KVM_EXIT_INTERNAL_ERROR;
1273 run->hw.hardware_exit_reason = vcpu->arch.trap;
1276 run->exit_reason = KVM_EXIT_UNKNOWN;
1277 run->ready_for_interrupt_injection = 1;
1278 switch (vcpu->arch.trap) {
1279 /* We're good on these - the host merely wanted to get our attention */
1280 case BOOK3S_INTERRUPT_HV_DECREMENTER:
1281 vcpu->stat.dec_exits++;
1284 case BOOK3S_INTERRUPT_EXTERNAL:
1285 case BOOK3S_INTERRUPT_H_DOORBELL:
1286 case BOOK3S_INTERRUPT_H_VIRT:
1287 vcpu->stat.ext_intr_exits++;
1290 /* SR/HMI/PMI are HV interrupts that host has handled. Resume guest.*/
1291 case BOOK3S_INTERRUPT_HMI:
1292 case BOOK3S_INTERRUPT_PERFMON:
1293 case BOOK3S_INTERRUPT_SYSTEM_RESET:
1296 case BOOK3S_INTERRUPT_MACHINE_CHECK:
1297 /* Print the MCE event to host console. */
1298 machine_check_print_event_info(&vcpu->arch.mce_evt, false, true);
1301 * If the guest can do FWNMI, exit to userspace so it can
1302 * deliver a FWNMI to the guest.
1303 * Otherwise we synthesize a machine check for the guest
1304 * so that it knows that the machine check occurred.
1306 if (!vcpu->kvm->arch.fwnmi_enabled) {
1307 ulong flags = vcpu->arch.shregs.msr & 0x083c0000;
1308 kvmppc_core_queue_machine_check(vcpu, flags);
1313 /* Exit to guest with KVM_EXIT_NMI as exit reason */
1314 run->exit_reason = KVM_EXIT_NMI;
1315 run->hw.hardware_exit_reason = vcpu->arch.trap;
1316 /* Clear out the old NMI status from run->flags */
1317 run->flags &= ~KVM_RUN_PPC_NMI_DISP_MASK;
1318 /* Now set the NMI status */
1319 if (vcpu->arch.mce_evt.disposition == MCE_DISPOSITION_RECOVERED)
1320 run->flags |= KVM_RUN_PPC_NMI_DISP_FULLY_RECOV;
1322 run->flags |= KVM_RUN_PPC_NMI_DISP_NOT_RECOV;
1326 case BOOK3S_INTERRUPT_PROGRAM:
1330 * Normally program interrupts are delivered directly
1331 * to the guest by the hardware, but we can get here
1332 * as a result of a hypervisor emulation interrupt
1333 * (e40) getting turned into a 700 by BML RTAS.
1335 flags = vcpu->arch.shregs.msr & 0x1f0000ull;
1336 kvmppc_core_queue_program(vcpu, flags);
1340 case BOOK3S_INTERRUPT_SYSCALL:
1342 /* hcall - punt to userspace */
1345 /* hypercall with MSR_PR has already been handled in rmode,
1346 * and never reaches here.
1349 run->papr_hcall.nr = kvmppc_get_gpr(vcpu, 3);
1350 for (i = 0; i < 9; ++i)
1351 run->papr_hcall.args[i] = kvmppc_get_gpr(vcpu, 4 + i);
1352 run->exit_reason = KVM_EXIT_PAPR_HCALL;
1353 vcpu->arch.hcall_needed = 1;
1358 * We get these next two if the guest accesses a page which it thinks
1359 * it has mapped but which is not actually present, either because
1360 * it is for an emulated I/O device or because the corresonding
1361 * host page has been paged out. Any other HDSI/HISI interrupts
1362 * have been handled already.
1364 case BOOK3S_INTERRUPT_H_DATA_STORAGE:
1365 r = RESUME_PAGE_FAULT;
1367 case BOOK3S_INTERRUPT_H_INST_STORAGE:
1368 vcpu->arch.fault_dar = kvmppc_get_pc(vcpu);
1369 vcpu->arch.fault_dsisr = vcpu->arch.shregs.msr &
1370 DSISR_SRR1_MATCH_64S;
1371 if (vcpu->arch.shregs.msr & HSRR1_HISI_WRITE)
1372 vcpu->arch.fault_dsisr |= DSISR_ISSTORE;
1373 r = RESUME_PAGE_FAULT;
1376 * This occurs if the guest executes an illegal instruction.
1377 * If the guest debug is disabled, generate a program interrupt
1378 * to the guest. If guest debug is enabled, we need to check
1379 * whether the instruction is a software breakpoint instruction.
1380 * Accordingly return to Guest or Host.
1382 case BOOK3S_INTERRUPT_H_EMUL_ASSIST:
1383 if (vcpu->arch.emul_inst != KVM_INST_FETCH_FAILED)
1384 vcpu->arch.last_inst = kvmppc_need_byteswap(vcpu) ?
1385 swab32(vcpu->arch.emul_inst) :
1386 vcpu->arch.emul_inst;
1387 if (vcpu->guest_debug & KVM_GUESTDBG_USE_SW_BP) {
1388 r = kvmppc_emulate_debug_inst(run, vcpu);
1390 kvmppc_core_queue_program(vcpu, SRR1_PROGILL);
1395 * This occurs if the guest (kernel or userspace), does something that
1396 * is prohibited by HFSCR.
1397 * On POWER9, this could be a doorbell instruction that we need
1399 * Otherwise, we just generate a program interrupt to the guest.
1401 case BOOK3S_INTERRUPT_H_FAC_UNAVAIL:
1403 if (((vcpu->arch.hfscr >> 56) == FSCR_MSGP_LG) &&
1404 cpu_has_feature(CPU_FTR_ARCH_300))
1405 r = kvmppc_emulate_doorbell_instr(vcpu);
1406 if (r == EMULATE_FAIL) {
1407 kvmppc_core_queue_program(vcpu, SRR1_PROGILL);
1412 #ifdef CONFIG_PPC_TRANSACTIONAL_MEM
1413 case BOOK3S_INTERRUPT_HV_SOFTPATCH:
1415 * This occurs for various TM-related instructions that
1416 * we need to emulate on POWER9 DD2.2. We have already
1417 * handled the cases where the guest was in real-suspend
1418 * mode and was transitioning to transactional state.
1420 r = kvmhv_p9_tm_emulation(vcpu);
1424 case BOOK3S_INTERRUPT_HV_RM_HARD:
1425 r = RESUME_PASSTHROUGH;
1428 kvmppc_dump_regs(vcpu);
1429 printk(KERN_EMERG "trap=0x%x | pc=0x%lx | msr=0x%llx\n",
1430 vcpu->arch.trap, kvmppc_get_pc(vcpu),
1431 vcpu->arch.shregs.msr);
1432 run->hw.hardware_exit_reason = vcpu->arch.trap;
1440 static int kvmppc_handle_nested_exit(struct kvm_run *run, struct kvm_vcpu *vcpu)
1445 vcpu->stat.sum_exits++;
1448 * This can happen if an interrupt occurs in the last stages
1449 * of guest entry or the first stages of guest exit (i.e. after
1450 * setting paca->kvm_hstate.in_guest to KVM_GUEST_MODE_GUEST_HV
1451 * and before setting it to KVM_GUEST_MODE_HOST_HV).
1452 * That can happen due to a bug, or due to a machine check
1453 * occurring at just the wrong time.
1455 if (vcpu->arch.shregs.msr & MSR_HV) {
1456 pr_emerg("KVM trap in HV mode while nested!\n");
1457 pr_emerg("trap=0x%x | pc=0x%lx | msr=0x%llx\n",
1458 vcpu->arch.trap, kvmppc_get_pc(vcpu),
1459 vcpu->arch.shregs.msr);
1460 kvmppc_dump_regs(vcpu);
1463 switch (vcpu->arch.trap) {
1464 /* We're good on these - the host merely wanted to get our attention */
1465 case BOOK3S_INTERRUPT_HV_DECREMENTER:
1466 vcpu->stat.dec_exits++;
1469 case BOOK3S_INTERRUPT_EXTERNAL:
1470 vcpu->stat.ext_intr_exits++;
1473 case BOOK3S_INTERRUPT_H_DOORBELL:
1474 case BOOK3S_INTERRUPT_H_VIRT:
1475 vcpu->stat.ext_intr_exits++;
1478 /* SR/HMI/PMI are HV interrupts that host has handled. Resume guest.*/
1479 case BOOK3S_INTERRUPT_HMI:
1480 case BOOK3S_INTERRUPT_PERFMON:
1481 case BOOK3S_INTERRUPT_SYSTEM_RESET:
1484 case BOOK3S_INTERRUPT_MACHINE_CHECK:
1485 /* Pass the machine check to the L1 guest */
1487 /* Print the MCE event to host console. */
1488 machine_check_print_event_info(&vcpu->arch.mce_evt, false, true);
1491 * We get these next two if the guest accesses a page which it thinks
1492 * it has mapped but which is not actually present, either because
1493 * it is for an emulated I/O device or because the corresonding
1494 * host page has been paged out.
1496 case BOOK3S_INTERRUPT_H_DATA_STORAGE:
1497 srcu_idx = srcu_read_lock(&vcpu->kvm->srcu);
1498 r = kvmhv_nested_page_fault(run, vcpu);
1499 srcu_read_unlock(&vcpu->kvm->srcu, srcu_idx);
1501 case BOOK3S_INTERRUPT_H_INST_STORAGE:
1502 vcpu->arch.fault_dar = kvmppc_get_pc(vcpu);
1503 vcpu->arch.fault_dsisr = kvmppc_get_msr(vcpu) &
1504 DSISR_SRR1_MATCH_64S;
1505 if (vcpu->arch.shregs.msr & HSRR1_HISI_WRITE)
1506 vcpu->arch.fault_dsisr |= DSISR_ISSTORE;
1507 srcu_idx = srcu_read_lock(&vcpu->kvm->srcu);
1508 r = kvmhv_nested_page_fault(run, vcpu);
1509 srcu_read_unlock(&vcpu->kvm->srcu, srcu_idx);
1512 #ifdef CONFIG_PPC_TRANSACTIONAL_MEM
1513 case BOOK3S_INTERRUPT_HV_SOFTPATCH:
1515 * This occurs for various TM-related instructions that
1516 * we need to emulate on POWER9 DD2.2. We have already
1517 * handled the cases where the guest was in real-suspend
1518 * mode and was transitioning to transactional state.
1520 r = kvmhv_p9_tm_emulation(vcpu);
1524 case BOOK3S_INTERRUPT_HV_RM_HARD:
1525 vcpu->arch.trap = 0;
1527 if (!xics_on_xive())
1528 kvmppc_xics_rm_complete(vcpu, 0);
1538 static int kvm_arch_vcpu_ioctl_get_sregs_hv(struct kvm_vcpu *vcpu,
1539 struct kvm_sregs *sregs)
1543 memset(sregs, 0, sizeof(struct kvm_sregs));
1544 sregs->pvr = vcpu->arch.pvr;
1545 for (i = 0; i < vcpu->arch.slb_max; i++) {
1546 sregs->u.s.ppc64.slb[i].slbe = vcpu->arch.slb[i].orige;
1547 sregs->u.s.ppc64.slb[i].slbv = vcpu->arch.slb[i].origv;
1553 static int kvm_arch_vcpu_ioctl_set_sregs_hv(struct kvm_vcpu *vcpu,
1554 struct kvm_sregs *sregs)
1558 /* Only accept the same PVR as the host's, since we can't spoof it */
1559 if (sregs->pvr != vcpu->arch.pvr)
1563 for (i = 0; i < vcpu->arch.slb_nr; i++) {
1564 if (sregs->u.s.ppc64.slb[i].slbe & SLB_ESID_V) {
1565 vcpu->arch.slb[j].orige = sregs->u.s.ppc64.slb[i].slbe;
1566 vcpu->arch.slb[j].origv = sregs->u.s.ppc64.slb[i].slbv;
1570 vcpu->arch.slb_max = j;
1575 static void kvmppc_set_lpcr(struct kvm_vcpu *vcpu, u64 new_lpcr,
1576 bool preserve_top32)
1578 struct kvm *kvm = vcpu->kvm;
1579 struct kvmppc_vcore *vc = vcpu->arch.vcore;
1582 spin_lock(&vc->lock);
1584 * If ILE (interrupt little-endian) has changed, update the
1585 * MSR_LE bit in the intr_msr for each vcpu in this vcore.
1587 if ((new_lpcr & LPCR_ILE) != (vc->lpcr & LPCR_ILE)) {
1588 struct kvm_vcpu *vcpu;
1591 kvm_for_each_vcpu(i, vcpu, kvm) {
1592 if (vcpu->arch.vcore != vc)
1594 if (new_lpcr & LPCR_ILE)
1595 vcpu->arch.intr_msr |= MSR_LE;
1597 vcpu->arch.intr_msr &= ~MSR_LE;
1602 * Userspace can only modify DPFD (default prefetch depth),
1603 * ILE (interrupt little-endian) and TC (translation control).
1604 * On POWER8 and POWER9 userspace can also modify AIL (alt. interrupt loc.).
1606 mask = LPCR_DPFD | LPCR_ILE | LPCR_TC;
1607 if (cpu_has_feature(CPU_FTR_ARCH_207S))
1610 * On POWER9, allow userspace to enable large decrementer for the
1611 * guest, whether or not the host has it enabled.
1613 if (cpu_has_feature(CPU_FTR_ARCH_300))
1616 /* Broken 32-bit version of LPCR must not clear top bits */
1619 vc->lpcr = (vc->lpcr & ~mask) | (new_lpcr & mask);
1620 spin_unlock(&vc->lock);
1623 static int kvmppc_get_one_reg_hv(struct kvm_vcpu *vcpu, u64 id,
1624 union kvmppc_one_reg *val)
1630 case KVM_REG_PPC_DEBUG_INST:
1631 *val = get_reg_val(id, KVMPPC_INST_SW_BREAKPOINT);
1633 case KVM_REG_PPC_HIOR:
1634 *val = get_reg_val(id, 0);
1636 case KVM_REG_PPC_DABR:
1637 *val = get_reg_val(id, vcpu->arch.dabr);
1639 case KVM_REG_PPC_DABRX:
1640 *val = get_reg_val(id, vcpu->arch.dabrx);
1642 case KVM_REG_PPC_DSCR:
1643 *val = get_reg_val(id, vcpu->arch.dscr);
1645 case KVM_REG_PPC_PURR:
1646 *val = get_reg_val(id, vcpu->arch.purr);
1648 case KVM_REG_PPC_SPURR:
1649 *val = get_reg_val(id, vcpu->arch.spurr);
1651 case KVM_REG_PPC_AMR:
1652 *val = get_reg_val(id, vcpu->arch.amr);
1654 case KVM_REG_PPC_UAMOR:
1655 *val = get_reg_val(id, vcpu->arch.uamor);
1657 case KVM_REG_PPC_MMCR0 ... KVM_REG_PPC_MMCRS:
1658 i = id - KVM_REG_PPC_MMCR0;
1659 *val = get_reg_val(id, vcpu->arch.mmcr[i]);
1661 case KVM_REG_PPC_PMC1 ... KVM_REG_PPC_PMC8:
1662 i = id - KVM_REG_PPC_PMC1;
1663 *val = get_reg_val(id, vcpu->arch.pmc[i]);
1665 case KVM_REG_PPC_SPMC1 ... KVM_REG_PPC_SPMC2:
1666 i = id - KVM_REG_PPC_SPMC1;
1667 *val = get_reg_val(id, vcpu->arch.spmc[i]);
1669 case KVM_REG_PPC_SIAR:
1670 *val = get_reg_val(id, vcpu->arch.siar);
1672 case KVM_REG_PPC_SDAR:
1673 *val = get_reg_val(id, vcpu->arch.sdar);
1675 case KVM_REG_PPC_SIER:
1676 *val = get_reg_val(id, vcpu->arch.sier);
1678 case KVM_REG_PPC_IAMR:
1679 *val = get_reg_val(id, vcpu->arch.iamr);
1681 case KVM_REG_PPC_PSPB:
1682 *val = get_reg_val(id, vcpu->arch.pspb);
1684 case KVM_REG_PPC_DPDES:
1686 * On POWER9, where we are emulating msgsndp etc.,
1687 * we return 1 bit for each vcpu, which can come from
1688 * either vcore->dpdes or doorbell_request.
1689 * On POWER8, doorbell_request is 0.
1691 *val = get_reg_val(id, vcpu->arch.vcore->dpdes |
1692 vcpu->arch.doorbell_request);
1694 case KVM_REG_PPC_VTB:
1695 *val = get_reg_val(id, vcpu->arch.vcore->vtb);
1697 case KVM_REG_PPC_DAWR:
1698 *val = get_reg_val(id, vcpu->arch.dawr);
1700 case KVM_REG_PPC_DAWRX:
1701 *val = get_reg_val(id, vcpu->arch.dawrx);
1703 case KVM_REG_PPC_CIABR:
1704 *val = get_reg_val(id, vcpu->arch.ciabr);
1706 case KVM_REG_PPC_CSIGR:
1707 *val = get_reg_val(id, vcpu->arch.csigr);
1709 case KVM_REG_PPC_TACR:
1710 *val = get_reg_val(id, vcpu->arch.tacr);
1712 case KVM_REG_PPC_TCSCR:
1713 *val = get_reg_val(id, vcpu->arch.tcscr);
1715 case KVM_REG_PPC_PID:
1716 *val = get_reg_val(id, vcpu->arch.pid);
1718 case KVM_REG_PPC_ACOP:
1719 *val = get_reg_val(id, vcpu->arch.acop);
1721 case KVM_REG_PPC_WORT:
1722 *val = get_reg_val(id, vcpu->arch.wort);
1724 case KVM_REG_PPC_TIDR:
1725 *val = get_reg_val(id, vcpu->arch.tid);
1727 case KVM_REG_PPC_PSSCR:
1728 *val = get_reg_val(id, vcpu->arch.psscr);
1730 case KVM_REG_PPC_VPA_ADDR:
1731 spin_lock(&vcpu->arch.vpa_update_lock);
1732 *val = get_reg_val(id, vcpu->arch.vpa.next_gpa);
1733 spin_unlock(&vcpu->arch.vpa_update_lock);
1735 case KVM_REG_PPC_VPA_SLB:
1736 spin_lock(&vcpu->arch.vpa_update_lock);
1737 val->vpaval.addr = vcpu->arch.slb_shadow.next_gpa;
1738 val->vpaval.length = vcpu->arch.slb_shadow.len;
1739 spin_unlock(&vcpu->arch.vpa_update_lock);
1741 case KVM_REG_PPC_VPA_DTL:
1742 spin_lock(&vcpu->arch.vpa_update_lock);
1743 val->vpaval.addr = vcpu->arch.dtl.next_gpa;
1744 val->vpaval.length = vcpu->arch.dtl.len;
1745 spin_unlock(&vcpu->arch.vpa_update_lock);
1747 case KVM_REG_PPC_TB_OFFSET:
1748 *val = get_reg_val(id, vcpu->arch.vcore->tb_offset);
1750 case KVM_REG_PPC_LPCR:
1751 case KVM_REG_PPC_LPCR_64:
1752 *val = get_reg_val(id, vcpu->arch.vcore->lpcr);
1754 case KVM_REG_PPC_PPR:
1755 *val = get_reg_val(id, vcpu->arch.ppr);
1757 #ifdef CONFIG_PPC_TRANSACTIONAL_MEM
1758 case KVM_REG_PPC_TFHAR:
1759 *val = get_reg_val(id, vcpu->arch.tfhar);
1761 case KVM_REG_PPC_TFIAR:
1762 *val = get_reg_val(id, vcpu->arch.tfiar);
1764 case KVM_REG_PPC_TEXASR:
1765 *val = get_reg_val(id, vcpu->arch.texasr);
1767 case KVM_REG_PPC_TM_GPR0 ... KVM_REG_PPC_TM_GPR31:
1768 i = id - KVM_REG_PPC_TM_GPR0;
1769 *val = get_reg_val(id, vcpu->arch.gpr_tm[i]);
1771 case KVM_REG_PPC_TM_VSR0 ... KVM_REG_PPC_TM_VSR63:
1774 i = id - KVM_REG_PPC_TM_VSR0;
1776 for (j = 0; j < TS_FPRWIDTH; j++)
1777 val->vsxval[j] = vcpu->arch.fp_tm.fpr[i][j];
1779 if (cpu_has_feature(CPU_FTR_ALTIVEC))
1780 val->vval = vcpu->arch.vr_tm.vr[i-32];
1786 case KVM_REG_PPC_TM_CR:
1787 *val = get_reg_val(id, vcpu->arch.cr_tm);
1789 case KVM_REG_PPC_TM_XER:
1790 *val = get_reg_val(id, vcpu->arch.xer_tm);
1792 case KVM_REG_PPC_TM_LR:
1793 *val = get_reg_val(id, vcpu->arch.lr_tm);
1795 case KVM_REG_PPC_TM_CTR:
1796 *val = get_reg_val(id, vcpu->arch.ctr_tm);
1798 case KVM_REG_PPC_TM_FPSCR:
1799 *val = get_reg_val(id, vcpu->arch.fp_tm.fpscr);
1801 case KVM_REG_PPC_TM_AMR:
1802 *val = get_reg_val(id, vcpu->arch.amr_tm);
1804 case KVM_REG_PPC_TM_PPR:
1805 *val = get_reg_val(id, vcpu->arch.ppr_tm);
1807 case KVM_REG_PPC_TM_VRSAVE:
1808 *val = get_reg_val(id, vcpu->arch.vrsave_tm);
1810 case KVM_REG_PPC_TM_VSCR:
1811 if (cpu_has_feature(CPU_FTR_ALTIVEC))
1812 *val = get_reg_val(id, vcpu->arch.vr_tm.vscr.u[3]);
1816 case KVM_REG_PPC_TM_DSCR:
1817 *val = get_reg_val(id, vcpu->arch.dscr_tm);
1819 case KVM_REG_PPC_TM_TAR:
1820 *val = get_reg_val(id, vcpu->arch.tar_tm);
1823 case KVM_REG_PPC_ARCH_COMPAT:
1824 *val = get_reg_val(id, vcpu->arch.vcore->arch_compat);
1826 case KVM_REG_PPC_DEC_EXPIRY:
1827 *val = get_reg_val(id, vcpu->arch.dec_expires +
1828 vcpu->arch.vcore->tb_offset);
1830 case KVM_REG_PPC_ONLINE:
1831 *val = get_reg_val(id, vcpu->arch.online);
1833 case KVM_REG_PPC_PTCR:
1834 *val = get_reg_val(id, vcpu->kvm->arch.l1_ptcr);
1844 static int kvmppc_set_one_reg_hv(struct kvm_vcpu *vcpu, u64 id,
1845 union kvmppc_one_reg *val)
1849 unsigned long addr, len;
1852 case KVM_REG_PPC_HIOR:
1853 /* Only allow this to be set to zero */
1854 if (set_reg_val(id, *val))
1857 case KVM_REG_PPC_DABR:
1858 vcpu->arch.dabr = set_reg_val(id, *val);
1860 case KVM_REG_PPC_DABRX:
1861 vcpu->arch.dabrx = set_reg_val(id, *val) & ~DABRX_HYP;
1863 case KVM_REG_PPC_DSCR:
1864 vcpu->arch.dscr = set_reg_val(id, *val);
1866 case KVM_REG_PPC_PURR:
1867 vcpu->arch.purr = set_reg_val(id, *val);
1869 case KVM_REG_PPC_SPURR:
1870 vcpu->arch.spurr = set_reg_val(id, *val);
1872 case KVM_REG_PPC_AMR:
1873 vcpu->arch.amr = set_reg_val(id, *val);
1875 case KVM_REG_PPC_UAMOR:
1876 vcpu->arch.uamor = set_reg_val(id, *val);
1878 case KVM_REG_PPC_MMCR0 ... KVM_REG_PPC_MMCRS:
1879 i = id - KVM_REG_PPC_MMCR0;
1880 vcpu->arch.mmcr[i] = set_reg_val(id, *val);
1882 case KVM_REG_PPC_PMC1 ... KVM_REG_PPC_PMC8:
1883 i = id - KVM_REG_PPC_PMC1;
1884 vcpu->arch.pmc[i] = set_reg_val(id, *val);
1886 case KVM_REG_PPC_SPMC1 ... KVM_REG_PPC_SPMC2:
1887 i = id - KVM_REG_PPC_SPMC1;
1888 vcpu->arch.spmc[i] = set_reg_val(id, *val);
1890 case KVM_REG_PPC_SIAR:
1891 vcpu->arch.siar = set_reg_val(id, *val);
1893 case KVM_REG_PPC_SDAR:
1894 vcpu->arch.sdar = set_reg_val(id, *val);
1896 case KVM_REG_PPC_SIER:
1897 vcpu->arch.sier = set_reg_val(id, *val);
1899 case KVM_REG_PPC_IAMR:
1900 vcpu->arch.iamr = set_reg_val(id, *val);
1902 case KVM_REG_PPC_PSPB:
1903 vcpu->arch.pspb = set_reg_val(id, *val);
1905 case KVM_REG_PPC_DPDES:
1906 vcpu->arch.vcore->dpdes = set_reg_val(id, *val);
1908 case KVM_REG_PPC_VTB:
1909 vcpu->arch.vcore->vtb = set_reg_val(id, *val);
1911 case KVM_REG_PPC_DAWR:
1912 vcpu->arch.dawr = set_reg_val(id, *val);
1914 case KVM_REG_PPC_DAWRX:
1915 vcpu->arch.dawrx = set_reg_val(id, *val) & ~DAWRX_HYP;
1917 case KVM_REG_PPC_CIABR:
1918 vcpu->arch.ciabr = set_reg_val(id, *val);
1919 /* Don't allow setting breakpoints in hypervisor code */
1920 if ((vcpu->arch.ciabr & CIABR_PRIV) == CIABR_PRIV_HYPER)
1921 vcpu->arch.ciabr &= ~CIABR_PRIV; /* disable */
1923 case KVM_REG_PPC_CSIGR:
1924 vcpu->arch.csigr = set_reg_val(id, *val);
1926 case KVM_REG_PPC_TACR:
1927 vcpu->arch.tacr = set_reg_val(id, *val);
1929 case KVM_REG_PPC_TCSCR:
1930 vcpu->arch.tcscr = set_reg_val(id, *val);
1932 case KVM_REG_PPC_PID:
1933 vcpu->arch.pid = set_reg_val(id, *val);
1935 case KVM_REG_PPC_ACOP:
1936 vcpu->arch.acop = set_reg_val(id, *val);
1938 case KVM_REG_PPC_WORT:
1939 vcpu->arch.wort = set_reg_val(id, *val);
1941 case KVM_REG_PPC_TIDR:
1942 vcpu->arch.tid = set_reg_val(id, *val);
1944 case KVM_REG_PPC_PSSCR:
1945 vcpu->arch.psscr = set_reg_val(id, *val) & PSSCR_GUEST_VIS;
1947 case KVM_REG_PPC_VPA_ADDR:
1948 addr = set_reg_val(id, *val);
1950 if (!addr && (vcpu->arch.slb_shadow.next_gpa ||
1951 vcpu->arch.dtl.next_gpa))
1953 r = set_vpa(vcpu, &vcpu->arch.vpa, addr, sizeof(struct lppaca));
1955 case KVM_REG_PPC_VPA_SLB:
1956 addr = val->vpaval.addr;
1957 len = val->vpaval.length;
1959 if (addr && !vcpu->arch.vpa.next_gpa)
1961 r = set_vpa(vcpu, &vcpu->arch.slb_shadow, addr, len);
1963 case KVM_REG_PPC_VPA_DTL:
1964 addr = val->vpaval.addr;
1965 len = val->vpaval.length;
1967 if (addr && (len < sizeof(struct dtl_entry) ||
1968 !vcpu->arch.vpa.next_gpa))
1970 len -= len % sizeof(struct dtl_entry);
1971 r = set_vpa(vcpu, &vcpu->arch.dtl, addr, len);
1973 case KVM_REG_PPC_TB_OFFSET:
1974 /* round up to multiple of 2^24 */
1975 vcpu->arch.vcore->tb_offset =
1976 ALIGN(set_reg_val(id, *val), 1UL << 24);
1978 case KVM_REG_PPC_LPCR:
1979 kvmppc_set_lpcr(vcpu, set_reg_val(id, *val), true);
1981 case KVM_REG_PPC_LPCR_64:
1982 kvmppc_set_lpcr(vcpu, set_reg_val(id, *val), false);
1984 case KVM_REG_PPC_PPR:
1985 vcpu->arch.ppr = set_reg_val(id, *val);
1987 #ifdef CONFIG_PPC_TRANSACTIONAL_MEM
1988 case KVM_REG_PPC_TFHAR:
1989 vcpu->arch.tfhar = set_reg_val(id, *val);
1991 case KVM_REG_PPC_TFIAR:
1992 vcpu->arch.tfiar = set_reg_val(id, *val);
1994 case KVM_REG_PPC_TEXASR:
1995 vcpu->arch.texasr = set_reg_val(id, *val);
1997 case KVM_REG_PPC_TM_GPR0 ... KVM_REG_PPC_TM_GPR31:
1998 i = id - KVM_REG_PPC_TM_GPR0;
1999 vcpu->arch.gpr_tm[i] = set_reg_val(id, *val);
2001 case KVM_REG_PPC_TM_VSR0 ... KVM_REG_PPC_TM_VSR63:
2004 i = id - KVM_REG_PPC_TM_VSR0;
2006 for (j = 0; j < TS_FPRWIDTH; j++)
2007 vcpu->arch.fp_tm.fpr[i][j] = val->vsxval[j];
2009 if (cpu_has_feature(CPU_FTR_ALTIVEC))
2010 vcpu->arch.vr_tm.vr[i-32] = val->vval;
2015 case KVM_REG_PPC_TM_CR:
2016 vcpu->arch.cr_tm = set_reg_val(id, *val);
2018 case KVM_REG_PPC_TM_XER:
2019 vcpu->arch.xer_tm = set_reg_val(id, *val);
2021 case KVM_REG_PPC_TM_LR:
2022 vcpu->arch.lr_tm = set_reg_val(id, *val);
2024 case KVM_REG_PPC_TM_CTR:
2025 vcpu->arch.ctr_tm = set_reg_val(id, *val);
2027 case KVM_REG_PPC_TM_FPSCR:
2028 vcpu->arch.fp_tm.fpscr = set_reg_val(id, *val);
2030 case KVM_REG_PPC_TM_AMR:
2031 vcpu->arch.amr_tm = set_reg_val(id, *val);
2033 case KVM_REG_PPC_TM_PPR:
2034 vcpu->arch.ppr_tm = set_reg_val(id, *val);
2036 case KVM_REG_PPC_TM_VRSAVE:
2037 vcpu->arch.vrsave_tm = set_reg_val(id, *val);
2039 case KVM_REG_PPC_TM_VSCR:
2040 if (cpu_has_feature(CPU_FTR_ALTIVEC))
2041 vcpu->arch.vr.vscr.u[3] = set_reg_val(id, *val);
2045 case KVM_REG_PPC_TM_DSCR:
2046 vcpu->arch.dscr_tm = set_reg_val(id, *val);
2048 case KVM_REG_PPC_TM_TAR:
2049 vcpu->arch.tar_tm = set_reg_val(id, *val);
2052 case KVM_REG_PPC_ARCH_COMPAT:
2053 r = kvmppc_set_arch_compat(vcpu, set_reg_val(id, *val));
2055 case KVM_REG_PPC_DEC_EXPIRY:
2056 vcpu->arch.dec_expires = set_reg_val(id, *val) -
2057 vcpu->arch.vcore->tb_offset;
2059 case KVM_REG_PPC_ONLINE:
2060 i = set_reg_val(id, *val);
2061 if (i && !vcpu->arch.online)
2062 atomic_inc(&vcpu->arch.vcore->online_count);
2063 else if (!i && vcpu->arch.online)
2064 atomic_dec(&vcpu->arch.vcore->online_count);
2065 vcpu->arch.online = i;
2067 case KVM_REG_PPC_PTCR:
2068 vcpu->kvm->arch.l1_ptcr = set_reg_val(id, *val);
2079 * On POWER9, threads are independent and can be in different partitions.
2080 * Therefore we consider each thread to be a subcore.
2081 * There is a restriction that all threads have to be in the same
2082 * MMU mode (radix or HPT), unfortunately, but since we only support
2083 * HPT guests on a HPT host so far, that isn't an impediment yet.
2085 static int threads_per_vcore(struct kvm *kvm)
2087 if (kvm->arch.threads_indep)
2089 return threads_per_subcore;
2092 static struct kvmppc_vcore *kvmppc_vcore_create(struct kvm *kvm, int id)
2094 struct kvmppc_vcore *vcore;
2096 vcore = kzalloc(sizeof(struct kvmppc_vcore), GFP_KERNEL);
2101 spin_lock_init(&vcore->lock);
2102 spin_lock_init(&vcore->stoltb_lock);
2103 init_swait_queue_head(&vcore->wq);
2104 vcore->preempt_tb = TB_NIL;
2105 vcore->lpcr = kvm->arch.lpcr;
2106 vcore->first_vcpuid = id;
2108 INIT_LIST_HEAD(&vcore->preempt_list);
2113 #ifdef CONFIG_KVM_BOOK3S_HV_EXIT_TIMING
2114 static struct debugfs_timings_element {
2118 {"rm_entry", offsetof(struct kvm_vcpu, arch.rm_entry)},
2119 {"rm_intr", offsetof(struct kvm_vcpu, arch.rm_intr)},
2120 {"rm_exit", offsetof(struct kvm_vcpu, arch.rm_exit)},
2121 {"guest", offsetof(struct kvm_vcpu, arch.guest_time)},
2122 {"cede", offsetof(struct kvm_vcpu, arch.cede_time)},
2125 #define N_TIMINGS (ARRAY_SIZE(timings))
2127 struct debugfs_timings_state {
2128 struct kvm_vcpu *vcpu;
2129 unsigned int buflen;
2130 char buf[N_TIMINGS * 100];
2133 static int debugfs_timings_open(struct inode *inode, struct file *file)
2135 struct kvm_vcpu *vcpu = inode->i_private;
2136 struct debugfs_timings_state *p;
2138 p = kzalloc(sizeof(*p), GFP_KERNEL);
2142 kvm_get_kvm(vcpu->kvm);
2144 file->private_data = p;
2146 return nonseekable_open(inode, file);
2149 static int debugfs_timings_release(struct inode *inode, struct file *file)
2151 struct debugfs_timings_state *p = file->private_data;
2153 kvm_put_kvm(p->vcpu->kvm);
2158 static ssize_t debugfs_timings_read(struct file *file, char __user *buf,
2159 size_t len, loff_t *ppos)
2161 struct debugfs_timings_state *p = file->private_data;
2162 struct kvm_vcpu *vcpu = p->vcpu;
2164 struct kvmhv_tb_accumulator tb;
2173 buf_end = s + sizeof(p->buf);
2174 for (i = 0; i < N_TIMINGS; ++i) {
2175 struct kvmhv_tb_accumulator *acc;
2177 acc = (struct kvmhv_tb_accumulator *)
2178 ((unsigned long)vcpu + timings[i].offset);
2180 for (loops = 0; loops < 1000; ++loops) {
2181 count = acc->seqcount;
2186 if (count == acc->seqcount) {
2194 snprintf(s, buf_end - s, "%s: stuck\n",
2197 snprintf(s, buf_end - s,
2198 "%s: %llu %llu %llu %llu\n",
2199 timings[i].name, count / 2,
2200 tb_to_ns(tb.tb_total),
2201 tb_to_ns(tb.tb_min),
2202 tb_to_ns(tb.tb_max));
2205 p->buflen = s - p->buf;
2209 if (pos >= p->buflen)
2211 if (len > p->buflen - pos)
2212 len = p->buflen - pos;
2213 n = copy_to_user(buf, p->buf + pos, len);
2223 static ssize_t debugfs_timings_write(struct file *file, const char __user *buf,
2224 size_t len, loff_t *ppos)
2229 static const struct file_operations debugfs_timings_ops = {
2230 .owner = THIS_MODULE,
2231 .open = debugfs_timings_open,
2232 .release = debugfs_timings_release,
2233 .read = debugfs_timings_read,
2234 .write = debugfs_timings_write,
2235 .llseek = generic_file_llseek,
2238 /* Create a debugfs directory for the vcpu */
2239 static void debugfs_vcpu_init(struct kvm_vcpu *vcpu, unsigned int id)
2242 struct kvm *kvm = vcpu->kvm;
2244 snprintf(buf, sizeof(buf), "vcpu%u", id);
2245 if (IS_ERR_OR_NULL(kvm->arch.debugfs_dir))
2247 vcpu->arch.debugfs_dir = debugfs_create_dir(buf, kvm->arch.debugfs_dir);
2248 if (IS_ERR_OR_NULL(vcpu->arch.debugfs_dir))
2250 vcpu->arch.debugfs_timings =
2251 debugfs_create_file("timings", 0444, vcpu->arch.debugfs_dir,
2252 vcpu, &debugfs_timings_ops);
2255 #else /* CONFIG_KVM_BOOK3S_HV_EXIT_TIMING */
2256 static void debugfs_vcpu_init(struct kvm_vcpu *vcpu, unsigned int id)
2259 #endif /* CONFIG_KVM_BOOK3S_HV_EXIT_TIMING */
2261 static struct kvm_vcpu *kvmppc_core_vcpu_create_hv(struct kvm *kvm,
2264 struct kvm_vcpu *vcpu;
2267 struct kvmppc_vcore *vcore;
2270 vcpu = kmem_cache_zalloc(kvm_vcpu_cache, GFP_KERNEL);
2274 err = kvm_vcpu_init(vcpu, kvm, id);
2278 vcpu->arch.shared = &vcpu->arch.shregs;
2279 #ifdef CONFIG_KVM_BOOK3S_PR_POSSIBLE
2281 * The shared struct is never shared on HV,
2282 * so we can always use host endianness
2284 #ifdef __BIG_ENDIAN__
2285 vcpu->arch.shared_big_endian = true;
2287 vcpu->arch.shared_big_endian = false;
2290 vcpu->arch.mmcr[0] = MMCR0_FC;
2291 vcpu->arch.ctrl = CTRL_RUNLATCH;
2292 /* default to host PVR, since we can't spoof it */
2293 kvmppc_set_pvr_hv(vcpu, mfspr(SPRN_PVR));
2294 spin_lock_init(&vcpu->arch.vpa_update_lock);
2295 spin_lock_init(&vcpu->arch.tbacct_lock);
2296 vcpu->arch.busy_preempt = TB_NIL;
2297 vcpu->arch.intr_msr = MSR_SF | MSR_ME;
2300 * Set the default HFSCR for the guest from the host value.
2301 * This value is only used on POWER9.
2302 * On POWER9, we want to virtualize the doorbell facility, so we
2303 * don't set the HFSCR_MSGP bit, and that causes those instructions
2304 * to trap and then we emulate them.
2306 vcpu->arch.hfscr = HFSCR_TAR | HFSCR_EBB | HFSCR_PM | HFSCR_BHRB |
2307 HFSCR_DSCR | HFSCR_VECVSX | HFSCR_FP;
2308 if (cpu_has_feature(CPU_FTR_HVMODE)) {
2309 vcpu->arch.hfscr &= mfspr(SPRN_HFSCR);
2310 #ifdef CONFIG_PPC_TRANSACTIONAL_MEM
2311 if (cpu_has_feature(CPU_FTR_P9_TM_HV_ASSIST))
2312 vcpu->arch.hfscr |= HFSCR_TM;
2315 if (cpu_has_feature(CPU_FTR_TM_COMP))
2316 vcpu->arch.hfscr |= HFSCR_TM;
2318 kvmppc_mmu_book3s_hv_init(vcpu);
2320 vcpu->arch.state = KVMPPC_VCPU_NOTREADY;
2322 init_waitqueue_head(&vcpu->arch.cpu_run);
2324 mutex_lock(&kvm->lock);
2327 if (cpu_has_feature(CPU_FTR_ARCH_300)) {
2328 if (id >= (KVM_MAX_VCPUS * kvm->arch.emul_smt_mode)) {
2329 pr_devel("KVM: VCPU ID too high\n");
2330 core = KVM_MAX_VCORES;
2332 BUG_ON(kvm->arch.smt_mode != 1);
2333 core = kvmppc_pack_vcpu_id(kvm, id);
2336 core = id / kvm->arch.smt_mode;
2338 if (core < KVM_MAX_VCORES) {
2339 vcore = kvm->arch.vcores[core];
2340 if (vcore && cpu_has_feature(CPU_FTR_ARCH_300)) {
2341 pr_devel("KVM: collision on id %u", id);
2343 } else if (!vcore) {
2345 * Take mmu_setup_lock for mutual exclusion
2346 * with kvmppc_update_lpcr().
2349 vcore = kvmppc_vcore_create(kvm,
2350 id & ~(kvm->arch.smt_mode - 1));
2351 mutex_lock(&kvm->arch.mmu_setup_lock);
2352 kvm->arch.vcores[core] = vcore;
2353 kvm->arch.online_vcores++;
2354 mutex_unlock(&kvm->arch.mmu_setup_lock);
2357 mutex_unlock(&kvm->lock);
2362 spin_lock(&vcore->lock);
2363 ++vcore->num_threads;
2364 spin_unlock(&vcore->lock);
2365 vcpu->arch.vcore = vcore;
2366 vcpu->arch.ptid = vcpu->vcpu_id - vcore->first_vcpuid;
2367 vcpu->arch.thread_cpu = -1;
2368 vcpu->arch.prev_cpu = -1;
2370 vcpu->arch.cpu_type = KVM_CPU_3S_64;
2371 kvmppc_sanity_check(vcpu);
2373 debugfs_vcpu_init(vcpu, id);
2378 kvm_vcpu_uninit(vcpu);
2380 kmem_cache_free(kvm_vcpu_cache, vcpu);
2382 return ERR_PTR(err);
2385 static int kvmhv_set_smt_mode(struct kvm *kvm, unsigned long smt_mode,
2386 unsigned long flags)
2393 if (smt_mode > MAX_SMT_THREADS || !is_power_of_2(smt_mode))
2395 if (!cpu_has_feature(CPU_FTR_ARCH_300)) {
2397 * On POWER8 (or POWER7), the threading mode is "strict",
2398 * so we pack smt_mode vcpus per vcore.
2400 if (smt_mode > threads_per_subcore)
2404 * On POWER9, the threading mode is "loose",
2405 * so each vcpu gets its own vcore.
2410 mutex_lock(&kvm->lock);
2412 if (!kvm->arch.online_vcores) {
2413 kvm->arch.smt_mode = smt_mode;
2414 kvm->arch.emul_smt_mode = esmt;
2417 mutex_unlock(&kvm->lock);
2422 static void unpin_vpa(struct kvm *kvm, struct kvmppc_vpa *vpa)
2424 if (vpa->pinned_addr)
2425 kvmppc_unpin_guest_page(kvm, vpa->pinned_addr, vpa->gpa,
2429 static void kvmppc_core_vcpu_free_hv(struct kvm_vcpu *vcpu)
2431 spin_lock(&vcpu->arch.vpa_update_lock);
2432 unpin_vpa(vcpu->kvm, &vcpu->arch.dtl);
2433 unpin_vpa(vcpu->kvm, &vcpu->arch.slb_shadow);
2434 unpin_vpa(vcpu->kvm, &vcpu->arch.vpa);
2435 spin_unlock(&vcpu->arch.vpa_update_lock);
2436 kvm_vcpu_uninit(vcpu);
2437 kmem_cache_free(kvm_vcpu_cache, vcpu);
2440 static int kvmppc_core_check_requests_hv(struct kvm_vcpu *vcpu)
2442 /* Indicate we want to get back into the guest */
2446 static void kvmppc_set_timer(struct kvm_vcpu *vcpu)
2448 unsigned long dec_nsec, now;
2451 if (now > vcpu->arch.dec_expires) {
2452 /* decrementer has already gone negative */
2453 kvmppc_core_queue_dec(vcpu);
2454 kvmppc_core_prepare_to_enter(vcpu);
2457 dec_nsec = tb_to_ns(vcpu->arch.dec_expires - now);
2458 hrtimer_start(&vcpu->arch.dec_timer, dec_nsec, HRTIMER_MODE_REL);
2459 vcpu->arch.timer_running = 1;
2462 static void kvmppc_end_cede(struct kvm_vcpu *vcpu)
2464 vcpu->arch.ceded = 0;
2465 if (vcpu->arch.timer_running) {
2466 hrtimer_try_to_cancel(&vcpu->arch.dec_timer);
2467 vcpu->arch.timer_running = 0;
2471 extern int __kvmppc_vcore_entry(void);
2473 static void kvmppc_remove_runnable(struct kvmppc_vcore *vc,
2474 struct kvm_vcpu *vcpu)
2478 if (vcpu->arch.state != KVMPPC_VCPU_RUNNABLE)
2480 spin_lock_irq(&vcpu->arch.tbacct_lock);
2482 vcpu->arch.busy_stolen += vcore_stolen_time(vc, now) -
2483 vcpu->arch.stolen_logged;
2484 vcpu->arch.busy_preempt = now;
2485 vcpu->arch.state = KVMPPC_VCPU_BUSY_IN_HOST;
2486 spin_unlock_irq(&vcpu->arch.tbacct_lock);
2488 WRITE_ONCE(vc->runnable_threads[vcpu->arch.ptid], NULL);
2491 static int kvmppc_grab_hwthread(int cpu)
2493 struct paca_struct *tpaca;
2494 long timeout = 10000;
2496 tpaca = paca_ptrs[cpu];
2498 /* Ensure the thread won't go into the kernel if it wakes */
2499 tpaca->kvm_hstate.kvm_vcpu = NULL;
2500 tpaca->kvm_hstate.kvm_vcore = NULL;
2501 tpaca->kvm_hstate.napping = 0;
2503 tpaca->kvm_hstate.hwthread_req = 1;
2506 * If the thread is already executing in the kernel (e.g. handling
2507 * a stray interrupt), wait for it to get back to nap mode.
2508 * The smp_mb() is to ensure that our setting of hwthread_req
2509 * is visible before we look at hwthread_state, so if this
2510 * races with the code at system_reset_pSeries and the thread
2511 * misses our setting of hwthread_req, we are sure to see its
2512 * setting of hwthread_state, and vice versa.
2515 while (tpaca->kvm_hstate.hwthread_state == KVM_HWTHREAD_IN_KERNEL) {
2516 if (--timeout <= 0) {
2517 pr_err("KVM: couldn't grab cpu %d\n", cpu);
2525 static void kvmppc_release_hwthread(int cpu)
2527 struct paca_struct *tpaca;
2529 tpaca = paca_ptrs[cpu];
2530 tpaca->kvm_hstate.hwthread_req = 0;
2531 tpaca->kvm_hstate.kvm_vcpu = NULL;
2532 tpaca->kvm_hstate.kvm_vcore = NULL;
2533 tpaca->kvm_hstate.kvm_split_mode = NULL;
2536 static void radix_flush_cpu(struct kvm *kvm, int cpu, struct kvm_vcpu *vcpu)
2538 struct kvm_nested_guest *nested = vcpu->arch.nested;
2539 cpumask_t *cpu_in_guest;
2542 cpu = cpu_first_tlb_thread_sibling(cpu);
2544 cpumask_set_cpu(cpu, &nested->need_tlb_flush);
2545 cpu_in_guest = &nested->cpu_in_guest;
2547 cpumask_set_cpu(cpu, &kvm->arch.need_tlb_flush);
2548 cpu_in_guest = &kvm->arch.cpu_in_guest;
2551 * Make sure setting of bit in need_tlb_flush precedes
2552 * testing of cpu_in_guest bits. The matching barrier on
2553 * the other side is the first smp_mb() in kvmppc_run_core().
2556 for (i = cpu; i <= cpu_last_tlb_thread_sibling(cpu);
2557 i += cpu_tlb_thread_sibling_step())
2558 if (cpumask_test_cpu(i, cpu_in_guest))
2559 smp_call_function_single(i, do_nothing, NULL, 1);
2562 static void kvmppc_prepare_radix_vcpu(struct kvm_vcpu *vcpu, int pcpu)
2564 struct kvm_nested_guest *nested = vcpu->arch.nested;
2565 struct kvm *kvm = vcpu->kvm;
2568 if (!cpu_has_feature(CPU_FTR_HVMODE))
2572 prev_cpu = nested->prev_cpu[vcpu->arch.nested_vcpu_id];
2574 prev_cpu = vcpu->arch.prev_cpu;
2577 * With radix, the guest can do TLB invalidations itself,
2578 * and it could choose to use the local form (tlbiel) if
2579 * it is invalidating a translation that has only ever been
2580 * used on one vcpu. However, that doesn't mean it has
2581 * only ever been used on one physical cpu, since vcpus
2582 * can move around between pcpus. To cope with this, when
2583 * a vcpu moves from one pcpu to another, we need to tell
2584 * any vcpus running on the same core as this vcpu previously
2585 * ran to flush the TLB. The TLB is shared between threads,
2586 * so we use a single bit in .need_tlb_flush for all 4 threads.
2588 if (prev_cpu != pcpu) {
2589 if (prev_cpu >= 0 &&
2590 cpu_first_tlb_thread_sibling(prev_cpu) !=
2591 cpu_first_tlb_thread_sibling(pcpu))
2592 radix_flush_cpu(kvm, prev_cpu, vcpu);
2594 nested->prev_cpu[vcpu->arch.nested_vcpu_id] = pcpu;
2596 vcpu->arch.prev_cpu = pcpu;
2600 static void kvmppc_start_thread(struct kvm_vcpu *vcpu, struct kvmppc_vcore *vc)
2603 struct paca_struct *tpaca;
2604 struct kvm *kvm = vc->kvm;
2608 if (vcpu->arch.timer_running) {
2609 hrtimer_try_to_cancel(&vcpu->arch.dec_timer);
2610 vcpu->arch.timer_running = 0;
2612 cpu += vcpu->arch.ptid;
2613 vcpu->cpu = vc->pcpu;
2614 vcpu->arch.thread_cpu = cpu;
2615 cpumask_set_cpu(cpu, &kvm->arch.cpu_in_guest);
2617 tpaca = paca_ptrs[cpu];
2618 tpaca->kvm_hstate.kvm_vcpu = vcpu;
2619 tpaca->kvm_hstate.ptid = cpu - vc->pcpu;
2620 tpaca->kvm_hstate.fake_suspend = 0;
2621 /* Order stores to hstate.kvm_vcpu etc. before store to kvm_vcore */
2623 tpaca->kvm_hstate.kvm_vcore = vc;
2624 if (cpu != smp_processor_id())
2625 kvmppc_ipi_thread(cpu);
2628 static void kvmppc_wait_for_nap(int n_threads)
2630 int cpu = smp_processor_id();
2635 for (loops = 0; loops < 1000000; ++loops) {
2637 * Check if all threads are finished.
2638 * We set the vcore pointer when starting a thread
2639 * and the thread clears it when finished, so we look
2640 * for any threads that still have a non-NULL vcore ptr.
2642 for (i = 1; i < n_threads; ++i)
2643 if (paca_ptrs[cpu + i]->kvm_hstate.kvm_vcore)
2645 if (i == n_threads) {
2652 for (i = 1; i < n_threads; ++i)
2653 if (paca_ptrs[cpu + i]->kvm_hstate.kvm_vcore)
2654 pr_err("KVM: CPU %d seems to be stuck\n", cpu + i);
2658 * Check that we are on thread 0 and that any other threads in
2659 * this core are off-line. Then grab the threads so they can't
2662 static int on_primary_thread(void)
2664 int cpu = smp_processor_id();
2667 /* Are we on a primary subcore? */
2668 if (cpu_thread_in_subcore(cpu))
2672 while (++thr < threads_per_subcore)
2673 if (cpu_online(cpu + thr))
2676 /* Grab all hw threads so they can't go into the kernel */
2677 for (thr = 1; thr < threads_per_subcore; ++thr) {
2678 if (kvmppc_grab_hwthread(cpu + thr)) {
2679 /* Couldn't grab one; let the others go */
2681 kvmppc_release_hwthread(cpu + thr);
2682 } while (--thr > 0);
2690 * A list of virtual cores for each physical CPU.
2691 * These are vcores that could run but their runner VCPU tasks are
2692 * (or may be) preempted.
2694 struct preempted_vcore_list {
2695 struct list_head list;
2699 static DEFINE_PER_CPU(struct preempted_vcore_list, preempted_vcores);
2701 static void init_vcore_lists(void)
2705 for_each_possible_cpu(cpu) {
2706 struct preempted_vcore_list *lp = &per_cpu(preempted_vcores, cpu);
2707 spin_lock_init(&lp->lock);
2708 INIT_LIST_HEAD(&lp->list);
2712 static void kvmppc_vcore_preempt(struct kvmppc_vcore *vc)
2714 struct preempted_vcore_list *lp = this_cpu_ptr(&preempted_vcores);
2716 vc->vcore_state = VCORE_PREEMPT;
2717 vc->pcpu = smp_processor_id();
2718 if (vc->num_threads < threads_per_vcore(vc->kvm)) {
2719 spin_lock(&lp->lock);
2720 list_add_tail(&vc->preempt_list, &lp->list);
2721 spin_unlock(&lp->lock);
2724 /* Start accumulating stolen time */
2725 kvmppc_core_start_stolen(vc);
2728 static void kvmppc_vcore_end_preempt(struct kvmppc_vcore *vc)
2730 struct preempted_vcore_list *lp;
2732 kvmppc_core_end_stolen(vc);
2733 if (!list_empty(&vc->preempt_list)) {
2734 lp = &per_cpu(preempted_vcores, vc->pcpu);
2735 spin_lock(&lp->lock);
2736 list_del_init(&vc->preempt_list);
2737 spin_unlock(&lp->lock);
2739 vc->vcore_state = VCORE_INACTIVE;
2743 * This stores information about the virtual cores currently
2744 * assigned to a physical core.
2748 int max_subcore_threads;
2750 int subcore_threads[MAX_SUBCORES];
2751 struct kvmppc_vcore *vc[MAX_SUBCORES];
2755 * This mapping means subcores 0 and 1 can use threads 0-3 and 4-7
2756 * respectively in 2-way micro-threading (split-core) mode on POWER8.
2758 static int subcore_thread_map[MAX_SUBCORES] = { 0, 4, 2, 6 };
2760 static void init_core_info(struct core_info *cip, struct kvmppc_vcore *vc)
2762 memset(cip, 0, sizeof(*cip));
2763 cip->n_subcores = 1;
2764 cip->max_subcore_threads = vc->num_threads;
2765 cip->total_threads = vc->num_threads;
2766 cip->subcore_threads[0] = vc->num_threads;
2770 static bool subcore_config_ok(int n_subcores, int n_threads)
2773 * POWER9 "SMT4" cores are permanently in what is effectively a 4-way
2774 * split-core mode, with one thread per subcore.
2776 if (cpu_has_feature(CPU_FTR_ARCH_300))
2777 return n_subcores <= 4 && n_threads == 1;
2779 /* On POWER8, can only dynamically split if unsplit to begin with */
2780 if (n_subcores > 1 && threads_per_subcore < MAX_SMT_THREADS)
2782 if (n_subcores > MAX_SUBCORES)
2784 if (n_subcores > 1) {
2785 if (!(dynamic_mt_modes & 2))
2787 if (n_subcores > 2 && !(dynamic_mt_modes & 4))
2791 return n_subcores * roundup_pow_of_two(n_threads) <= MAX_SMT_THREADS;
2794 static void init_vcore_to_run(struct kvmppc_vcore *vc)
2796 vc->entry_exit_map = 0;
2798 vc->napping_threads = 0;
2799 vc->conferring_threads = 0;
2800 vc->tb_offset_applied = 0;
2803 static bool can_dynamic_split(struct kvmppc_vcore *vc, struct core_info *cip)
2805 int n_threads = vc->num_threads;
2808 if (!cpu_has_feature(CPU_FTR_ARCH_207S))
2811 /* In one_vm_per_core mode, require all vcores to be from the same vm */
2812 if (one_vm_per_core && vc->kvm != cip->vc[0]->kvm)
2815 /* Some POWER9 chips require all threads to be in the same MMU mode */
2816 if (no_mixing_hpt_and_radix &&
2817 kvm_is_radix(vc->kvm) != kvm_is_radix(cip->vc[0]->kvm))
2820 if (n_threads < cip->max_subcore_threads)
2821 n_threads = cip->max_subcore_threads;
2822 if (!subcore_config_ok(cip->n_subcores + 1, n_threads))
2824 cip->max_subcore_threads = n_threads;
2826 sub = cip->n_subcores;
2828 cip->total_threads += vc->num_threads;
2829 cip->subcore_threads[sub] = vc->num_threads;
2831 init_vcore_to_run(vc);
2832 list_del_init(&vc->preempt_list);
2838 * Work out whether it is possible to piggyback the execution of
2839 * vcore *pvc onto the execution of the other vcores described in *cip.
2841 static bool can_piggyback(struct kvmppc_vcore *pvc, struct core_info *cip,
2844 if (cip->total_threads + pvc->num_threads > target_threads)
2847 return can_dynamic_split(pvc, cip);
2850 static void prepare_threads(struct kvmppc_vcore *vc)
2853 struct kvm_vcpu *vcpu;
2855 for_each_runnable_thread(i, vcpu, vc) {
2856 if (signal_pending(vcpu->arch.run_task))
2857 vcpu->arch.ret = -EINTR;
2858 else if (vcpu->arch.vpa.update_pending ||
2859 vcpu->arch.slb_shadow.update_pending ||
2860 vcpu->arch.dtl.update_pending)
2861 vcpu->arch.ret = RESUME_GUEST;
2864 kvmppc_remove_runnable(vc, vcpu);
2865 wake_up(&vcpu->arch.cpu_run);
2869 static void collect_piggybacks(struct core_info *cip, int target_threads)
2871 struct preempted_vcore_list *lp = this_cpu_ptr(&preempted_vcores);
2872 struct kvmppc_vcore *pvc, *vcnext;
2874 spin_lock(&lp->lock);
2875 list_for_each_entry_safe(pvc, vcnext, &lp->list, preempt_list) {
2876 if (!spin_trylock(&pvc->lock))
2878 prepare_threads(pvc);
2879 if (!pvc->n_runnable || !pvc->kvm->arch.mmu_ready) {
2880 list_del_init(&pvc->preempt_list);
2881 if (pvc->runner == NULL) {
2882 pvc->vcore_state = VCORE_INACTIVE;
2883 kvmppc_core_end_stolen(pvc);
2885 spin_unlock(&pvc->lock);
2888 if (!can_piggyback(pvc, cip, target_threads)) {
2889 spin_unlock(&pvc->lock);
2892 kvmppc_core_end_stolen(pvc);
2893 pvc->vcore_state = VCORE_PIGGYBACK;
2894 if (cip->total_threads >= target_threads)
2897 spin_unlock(&lp->lock);
2900 static bool recheck_signals_and_mmu(struct core_info *cip)
2903 struct kvm_vcpu *vcpu;
2904 struct kvmppc_vcore *vc;
2906 for (sub = 0; sub < cip->n_subcores; ++sub) {
2908 if (!vc->kvm->arch.mmu_ready)
2910 for_each_runnable_thread(i, vcpu, vc)
2911 if (signal_pending(vcpu->arch.run_task))
2917 static void post_guest_process(struct kvmppc_vcore *vc, bool is_master)
2919 int still_running = 0, i;
2922 struct kvm_vcpu *vcpu;
2924 spin_lock(&vc->lock);
2926 for_each_runnable_thread(i, vcpu, vc) {
2928 * It's safe to unlock the vcore in the loop here, because
2929 * for_each_runnable_thread() is safe against removal of
2930 * the vcpu, and the vcore state is VCORE_EXITING here,
2931 * so any vcpus becoming runnable will have their arch.trap
2932 * set to zero and can't actually run in the guest.
2934 spin_unlock(&vc->lock);
2935 /* cancel pending dec exception if dec is positive */
2936 if (now < vcpu->arch.dec_expires &&
2937 kvmppc_core_pending_dec(vcpu))
2938 kvmppc_core_dequeue_dec(vcpu);
2940 trace_kvm_guest_exit(vcpu);
2943 if (vcpu->arch.trap)
2944 ret = kvmppc_handle_exit_hv(vcpu->arch.kvm_run, vcpu,
2945 vcpu->arch.run_task);
2947 vcpu->arch.ret = ret;
2948 vcpu->arch.trap = 0;
2950 spin_lock(&vc->lock);
2951 if (is_kvmppc_resume_guest(vcpu->arch.ret)) {
2952 if (vcpu->arch.pending_exceptions)
2953 kvmppc_core_prepare_to_enter(vcpu);
2954 if (vcpu->arch.ceded)
2955 kvmppc_set_timer(vcpu);
2959 kvmppc_remove_runnable(vc, vcpu);
2960 wake_up(&vcpu->arch.cpu_run);
2964 if (still_running > 0) {
2965 kvmppc_vcore_preempt(vc);
2966 } else if (vc->runner) {
2967 vc->vcore_state = VCORE_PREEMPT;
2968 kvmppc_core_start_stolen(vc);
2970 vc->vcore_state = VCORE_INACTIVE;
2972 if (vc->n_runnable > 0 && vc->runner == NULL) {
2973 /* make sure there's a candidate runner awake */
2975 vcpu = next_runnable_thread(vc, &i);
2976 wake_up(&vcpu->arch.cpu_run);
2979 spin_unlock(&vc->lock);
2983 * Clear core from the list of active host cores as we are about to
2984 * enter the guest. Only do this if it is the primary thread of the
2985 * core (not if a subcore) that is entering the guest.
2987 static inline int kvmppc_clear_host_core(unsigned int cpu)
2991 if (!kvmppc_host_rm_ops_hv || cpu_thread_in_core(cpu))
2994 * Memory barrier can be omitted here as we will do a smp_wmb()
2995 * later in kvmppc_start_thread and we need ensure that state is
2996 * visible to other CPUs only after we enter guest.
2998 core = cpu >> threads_shift;
2999 kvmppc_host_rm_ops_hv->rm_core[core].rm_state.in_host = 0;
3004 * Advertise this core as an active host core since we exited the guest
3005 * Only need to do this if it is the primary thread of the core that is
3008 static inline int kvmppc_set_host_core(unsigned int cpu)
3012 if (!kvmppc_host_rm_ops_hv || cpu_thread_in_core(cpu))
3016 * Memory barrier can be omitted here because we do a spin_unlock
3017 * immediately after this which provides the memory barrier.
3019 core = cpu >> threads_shift;
3020 kvmppc_host_rm_ops_hv->rm_core[core].rm_state.in_host = 1;
3024 static void set_irq_happened(int trap)
3027 case BOOK3S_INTERRUPT_EXTERNAL:
3028 local_paca->irq_happened |= PACA_IRQ_EE;
3030 case BOOK3S_INTERRUPT_H_DOORBELL:
3031 local_paca->irq_happened |= PACA_IRQ_DBELL;
3033 case BOOK3S_INTERRUPT_HMI:
3034 local_paca->irq_happened |= PACA_IRQ_HMI;
3036 case BOOK3S_INTERRUPT_SYSTEM_RESET:
3037 replay_system_reset();
3043 * Run a set of guest threads on a physical core.
3044 * Called with vc->lock held.
3046 static noinline void kvmppc_run_core(struct kvmppc_vcore *vc)
3048 struct kvm_vcpu *vcpu;
3051 struct core_info core_info;
3052 struct kvmppc_vcore *pvc;
3053 struct kvm_split_mode split_info, *sip;
3054 int split, subcore_size, active;
3057 unsigned long cmd_bit, stat_bit;
3060 int controlled_threads;
3066 * Remove from the list any threads that have a signal pending
3067 * or need a VPA update done
3069 prepare_threads(vc);
3071 /* if the runner is no longer runnable, let the caller pick a new one */
3072 if (vc->runner->arch.state != KVMPPC_VCPU_RUNNABLE)
3078 init_vcore_to_run(vc);
3079 vc->preempt_tb = TB_NIL;
3082 * Number of threads that we will be controlling: the same as
3083 * the number of threads per subcore, except on POWER9,
3084 * where it's 1 because the threads are (mostly) independent.
3086 controlled_threads = threads_per_vcore(vc->kvm);
3089 * Make sure we are running on primary threads, and that secondary
3090 * threads are offline. Also check if the number of threads in this
3091 * guest are greater than the current system threads per guest.
3092 * On POWER9, we need to be not in independent-threads mode if
3093 * this is a HPT guest on a radix host machine where the
3094 * CPU threads may not be in different MMU modes.
3096 hpt_on_radix = no_mixing_hpt_and_radix && radix_enabled() &&
3097 !kvm_is_radix(vc->kvm);
3098 if (((controlled_threads > 1) &&
3099 ((vc->num_threads > threads_per_subcore) || !on_primary_thread())) ||
3100 (hpt_on_radix && vc->kvm->arch.threads_indep)) {
3101 for_each_runnable_thread(i, vcpu, vc) {
3102 vcpu->arch.ret = -EBUSY;
3103 kvmppc_remove_runnable(vc, vcpu);
3104 wake_up(&vcpu->arch.cpu_run);
3110 * See if we could run any other vcores on the physical core
3111 * along with this one.
3113 init_core_info(&core_info, vc);
3114 pcpu = smp_processor_id();
3115 target_threads = controlled_threads;
3116 if (target_smt_mode && target_smt_mode < target_threads)
3117 target_threads = target_smt_mode;
3118 if (vc->num_threads < target_threads)
3119 collect_piggybacks(&core_info, target_threads);
3122 * On radix, arrange for TLB flushing if necessary.
3123 * This has to be done before disabling interrupts since
3124 * it uses smp_call_function().
3126 pcpu = smp_processor_id();
3127 if (kvm_is_radix(vc->kvm)) {
3128 for (sub = 0; sub < core_info.n_subcores; ++sub)
3129 for_each_runnable_thread(i, vcpu, core_info.vc[sub])
3130 kvmppc_prepare_radix_vcpu(vcpu, pcpu);
3134 * Hard-disable interrupts, and check resched flag and signals.
3135 * If we need to reschedule or deliver a signal, clean up
3136 * and return without going into the guest(s).
3137 * If the mmu_ready flag has been cleared, don't go into the
3138 * guest because that means a HPT resize operation is in progress.
3140 local_irq_disable();
3142 if (lazy_irq_pending() || need_resched() ||
3143 recheck_signals_and_mmu(&core_info)) {
3145 vc->vcore_state = VCORE_INACTIVE;
3146 /* Unlock all except the primary vcore */
3147 for (sub = 1; sub < core_info.n_subcores; ++sub) {
3148 pvc = core_info.vc[sub];
3149 /* Put back on to the preempted vcores list */
3150 kvmppc_vcore_preempt(pvc);
3151 spin_unlock(&pvc->lock);
3153 for (i = 0; i < controlled_threads; ++i)
3154 kvmppc_release_hwthread(pcpu + i);
3158 kvmppc_clear_host_core(pcpu);
3160 /* Decide on micro-threading (split-core) mode */
3161 subcore_size = threads_per_subcore;
3162 cmd_bit = stat_bit = 0;
3163 split = core_info.n_subcores;
3165 is_power8 = cpu_has_feature(CPU_FTR_ARCH_207S)
3166 && !cpu_has_feature(CPU_FTR_ARCH_300);
3168 if (split > 1 || hpt_on_radix) {
3170 memset(&split_info, 0, sizeof(split_info));
3171 for (sub = 0; sub < core_info.n_subcores; ++sub)
3172 split_info.vc[sub] = core_info.vc[sub];
3175 if (split == 2 && (dynamic_mt_modes & 2)) {
3176 cmd_bit = HID0_POWER8_1TO2LPAR;
3177 stat_bit = HID0_POWER8_2LPARMODE;
3180 cmd_bit = HID0_POWER8_1TO4LPAR;
3181 stat_bit = HID0_POWER8_4LPARMODE;
3183 subcore_size = MAX_SMT_THREADS / split;
3184 split_info.rpr = mfspr(SPRN_RPR);
3185 split_info.pmmar = mfspr(SPRN_PMMAR);
3186 split_info.ldbar = mfspr(SPRN_LDBAR);
3187 split_info.subcore_size = subcore_size;
3189 split_info.subcore_size = 1;
3191 /* Use the split_info for LPCR/LPIDR changes */
3192 split_info.lpcr_req = vc->lpcr;
3193 split_info.lpidr_req = vc->kvm->arch.lpid;
3194 split_info.host_lpcr = vc->kvm->arch.host_lpcr;
3195 split_info.do_set = 1;
3199 /* order writes to split_info before kvm_split_mode pointer */
3203 for (thr = 0; thr < controlled_threads; ++thr) {
3204 struct paca_struct *paca = paca_ptrs[pcpu + thr];
3206 paca->kvm_hstate.tid = thr;
3207 paca->kvm_hstate.napping = 0;
3208 paca->kvm_hstate.kvm_split_mode = sip;
3211 /* Initiate micro-threading (split-core) on POWER8 if required */
3213 unsigned long hid0 = mfspr(SPRN_HID0);
3215 hid0 |= cmd_bit | HID0_POWER8_DYNLPARDIS;
3217 mtspr(SPRN_HID0, hid0);
3220 hid0 = mfspr(SPRN_HID0);
3221 if (hid0 & stat_bit)
3228 * On POWER8, set RWMR register.
3229 * Since it only affects PURR and SPURR, it doesn't affect
3230 * the host, so we don't save/restore the host value.
3233 unsigned long rwmr_val = RWMR_RPA_P8_8THREAD;
3234 int n_online = atomic_read(&vc->online_count);
3237 * Use the 8-thread value if we're doing split-core
3238 * or if the vcore's online count looks bogus.
3240 if (split == 1 && threads_per_subcore == MAX_SMT_THREADS &&
3241 n_online >= 1 && n_online <= MAX_SMT_THREADS)
3242 rwmr_val = p8_rwmr_values[n_online];
3243 mtspr(SPRN_RWMR, rwmr_val);
3246 /* Start all the threads */
3248 for (sub = 0; sub < core_info.n_subcores; ++sub) {
3249 thr = is_power8 ? subcore_thread_map[sub] : sub;
3252 pvc = core_info.vc[sub];
3253 pvc->pcpu = pcpu + thr;
3254 for_each_runnable_thread(i, vcpu, pvc) {
3255 kvmppc_start_thread(vcpu, pvc);
3256 kvmppc_create_dtl_entry(vcpu, pvc);
3257 trace_kvm_guest_enter(vcpu);
3258 if (!vcpu->arch.ptid)
3260 active |= 1 << (thr + vcpu->arch.ptid);
3263 * We need to start the first thread of each subcore
3264 * even if it doesn't have a vcpu.
3267 kvmppc_start_thread(NULL, pvc);
3271 * Ensure that split_info.do_nap is set after setting
3272 * the vcore pointer in the PACA of the secondaries.
3277 * When doing micro-threading, poke the inactive threads as well.
3278 * This gets them to the nap instruction after kvm_do_nap,
3279 * which reduces the time taken to unsplit later.
3280 * For POWER9 HPT guest on radix host, we need all the secondary
3281 * threads woken up so they can do the LPCR/LPIDR change.
3283 if (cmd_bit || hpt_on_radix) {
3284 split_info.do_nap = 1; /* ask secondaries to nap when done */
3285 for (thr = 1; thr < threads_per_subcore; ++thr)
3286 if (!(active & (1 << thr)))
3287 kvmppc_ipi_thread(pcpu + thr);
3290 vc->vcore_state = VCORE_RUNNING;
3293 trace_kvmppc_run_core(vc, 0);
3295 for (sub = 0; sub < core_info.n_subcores; ++sub)
3296 spin_unlock(&core_info.vc[sub]->lock);
3298 guest_enter_irqoff();
3300 srcu_idx = srcu_read_lock(&vc->kvm->srcu);
3302 this_cpu_disable_ftrace();
3305 * Interrupts will be enabled once we get into the guest,
3306 * so tell lockdep that we're about to enable interrupts.
3308 trace_hardirqs_on();
3310 trap = __kvmppc_vcore_entry();
3312 trace_hardirqs_off();
3314 this_cpu_enable_ftrace();
3316 srcu_read_unlock(&vc->kvm->srcu, srcu_idx);
3318 set_irq_happened(trap);
3320 spin_lock(&vc->lock);
3321 /* prevent other vcpu threads from doing kvmppc_start_thread() now */
3322 vc->vcore_state = VCORE_EXITING;
3324 /* wait for secondary threads to finish writing their state to memory */
3325 kvmppc_wait_for_nap(controlled_threads);
3327 /* Return to whole-core mode if we split the core earlier */
3329 unsigned long hid0 = mfspr(SPRN_HID0);
3330 unsigned long loops = 0;
3332 hid0 &= ~HID0_POWER8_DYNLPARDIS;
3333 stat_bit = HID0_POWER8_2LPARMODE | HID0_POWER8_4LPARMODE;
3335 mtspr(SPRN_HID0, hid0);
3338 hid0 = mfspr(SPRN_HID0);
3339 if (!(hid0 & stat_bit))
3344 } else if (hpt_on_radix) {
3345 /* Wait for all threads to have seen final sync */
3346 for (thr = 1; thr < controlled_threads; ++thr) {
3347 struct paca_struct *paca = paca_ptrs[pcpu + thr];
3349 while (paca->kvm_hstate.kvm_split_mode) {
3356 split_info.do_nap = 0;
3358 kvmppc_set_host_core(pcpu);
3363 /* Let secondaries go back to the offline loop */
3364 for (i = 0; i < controlled_threads; ++i) {
3365 kvmppc_release_hwthread(pcpu + i);
3366 if (sip && sip->napped[i])
3367 kvmppc_ipi_thread(pcpu + i);
3368 cpumask_clear_cpu(pcpu + i, &vc->kvm->arch.cpu_in_guest);
3371 spin_unlock(&vc->lock);
3373 /* make sure updates to secondary vcpu structs are visible now */
3378 for (sub = 0; sub < core_info.n_subcores; ++sub) {
3379 pvc = core_info.vc[sub];
3380 post_guest_process(pvc, pvc == vc);
3383 spin_lock(&vc->lock);
3386 vc->vcore_state = VCORE_INACTIVE;
3387 trace_kvmppc_run_core(vc, 1);
3391 * Load up hypervisor-mode registers on P9.
3393 static int kvmhv_load_hv_regs_and_go(struct kvm_vcpu *vcpu, u64 time_limit,
3396 struct kvmppc_vcore *vc = vcpu->arch.vcore;
3398 u64 tb, purr, spurr;
3400 unsigned long host_hfscr = mfspr(SPRN_HFSCR);
3401 unsigned long host_ciabr = mfspr(SPRN_CIABR);
3402 unsigned long host_dawr = mfspr(SPRN_DAWR);
3403 unsigned long host_dawrx = mfspr(SPRN_DAWRX);
3404 unsigned long host_psscr = mfspr(SPRN_PSSCR);
3405 unsigned long host_pidr = mfspr(SPRN_PID);
3407 hdec = time_limit - mftb();
3409 return BOOK3S_INTERRUPT_HV_DECREMENTER;
3410 mtspr(SPRN_HDEC, hdec);
3412 if (vc->tb_offset) {
3413 u64 new_tb = mftb() + vc->tb_offset;
3414 mtspr(SPRN_TBU40, new_tb);
3416 if ((tb & 0xffffff) < (new_tb & 0xffffff))
3417 mtspr(SPRN_TBU40, new_tb + 0x1000000);
3418 vc->tb_offset_applied = vc->tb_offset;
3422 mtspr(SPRN_PCR, vc->pcr | PCR_MASK);
3423 mtspr(SPRN_DPDES, vc->dpdes);
3424 mtspr(SPRN_VTB, vc->vtb);
3426 local_paca->kvm_hstate.host_purr = mfspr(SPRN_PURR);
3427 local_paca->kvm_hstate.host_spurr = mfspr(SPRN_SPURR);
3428 mtspr(SPRN_PURR, vcpu->arch.purr);
3429 mtspr(SPRN_SPURR, vcpu->arch.spurr);
3431 if (dawr_enabled()) {
3432 mtspr(SPRN_DAWR, vcpu->arch.dawr);
3433 mtspr(SPRN_DAWRX, vcpu->arch.dawrx);
3435 mtspr(SPRN_CIABR, vcpu->arch.ciabr);
3436 mtspr(SPRN_IC, vcpu->arch.ic);
3437 mtspr(SPRN_PID, vcpu->arch.pid);
3439 mtspr(SPRN_PSSCR, vcpu->arch.psscr | PSSCR_EC |
3440 (local_paca->kvm_hstate.fake_suspend << PSSCR_FAKE_SUSPEND_LG));
3442 mtspr(SPRN_HFSCR, vcpu->arch.hfscr);
3444 mtspr(SPRN_SPRG0, vcpu->arch.shregs.sprg0);
3445 mtspr(SPRN_SPRG1, vcpu->arch.shregs.sprg1);
3446 mtspr(SPRN_SPRG2, vcpu->arch.shregs.sprg2);
3447 mtspr(SPRN_SPRG3, vcpu->arch.shregs.sprg3);
3449 mtspr(SPRN_AMOR, ~0UL);
3451 mtspr(SPRN_LPCR, lpcr);
3454 kvmppc_xive_push_vcpu(vcpu);
3456 mtspr(SPRN_SRR0, vcpu->arch.shregs.srr0);
3457 mtspr(SPRN_SRR1, vcpu->arch.shregs.srr1);
3459 trap = __kvmhv_vcpu_entry_p9(vcpu);
3461 /* Advance host PURR/SPURR by the amount used by guest */
3462 purr = mfspr(SPRN_PURR);
3463 spurr = mfspr(SPRN_SPURR);
3464 mtspr(SPRN_PURR, local_paca->kvm_hstate.host_purr +
3465 purr - vcpu->arch.purr);
3466 mtspr(SPRN_SPURR, local_paca->kvm_hstate.host_spurr +
3467 spurr - vcpu->arch.spurr);
3468 vcpu->arch.purr = purr;
3469 vcpu->arch.spurr = spurr;
3471 vcpu->arch.ic = mfspr(SPRN_IC);
3472 vcpu->arch.pid = mfspr(SPRN_PID);
3473 vcpu->arch.psscr = mfspr(SPRN_PSSCR) & PSSCR_GUEST_VIS;
3475 vcpu->arch.shregs.sprg0 = mfspr(SPRN_SPRG0);
3476 vcpu->arch.shregs.sprg1 = mfspr(SPRN_SPRG1);
3477 vcpu->arch.shregs.sprg2 = mfspr(SPRN_SPRG2);
3478 vcpu->arch.shregs.sprg3 = mfspr(SPRN_SPRG3);
3480 /* Preserve PSSCR[FAKE_SUSPEND] until we've called kvmppc_save_tm_hv */
3481 mtspr(SPRN_PSSCR, host_psscr |
3482 (local_paca->kvm_hstate.fake_suspend << PSSCR_FAKE_SUSPEND_LG));
3483 mtspr(SPRN_HFSCR, host_hfscr);
3484 mtspr(SPRN_CIABR, host_ciabr);
3485 mtspr(SPRN_DAWR, host_dawr);
3486 mtspr(SPRN_DAWRX, host_dawrx);
3487 mtspr(SPRN_PID, host_pidr);
3490 * Since this is radix, do a eieio; tlbsync; ptesync sequence in
3491 * case we interrupted the guest between a tlbie and a ptesync.
3493 asm volatile("eieio; tlbsync; ptesync");
3495 mtspr(SPRN_LPID, vcpu->kvm->arch.host_lpid); /* restore host LPID */
3498 vc->dpdes = mfspr(SPRN_DPDES);
3499 vc->vtb = mfspr(SPRN_VTB);
3500 mtspr(SPRN_DPDES, 0);
3502 mtspr(SPRN_PCR, PCR_MASK);
3504 if (vc->tb_offset_applied) {
3505 u64 new_tb = mftb() - vc->tb_offset_applied;
3506 mtspr(SPRN_TBU40, new_tb);
3508 if ((tb & 0xffffff) < (new_tb & 0xffffff))
3509 mtspr(SPRN_TBU40, new_tb + 0x1000000);
3510 vc->tb_offset_applied = 0;
3513 mtspr(SPRN_HDEC, 0x7fffffff);
3514 mtspr(SPRN_LPCR, vcpu->kvm->arch.host_lpcr);
3520 * Virtual-mode guest entry for POWER9 and later when the host and
3521 * guest are both using the radix MMU. The LPIDR has already been set.
3523 int kvmhv_p9_guest_entry(struct kvm_vcpu *vcpu, u64 time_limit,
3526 struct kvmppc_vcore *vc = vcpu->arch.vcore;
3527 unsigned long host_dscr = mfspr(SPRN_DSCR);
3528 unsigned long host_tidr = mfspr(SPRN_TIDR);
3529 unsigned long host_iamr = mfspr(SPRN_IAMR);
3530 unsigned long host_amr = mfspr(SPRN_AMR);
3535 dec = mfspr(SPRN_DEC);
3538 return BOOK3S_INTERRUPT_HV_DECREMENTER;
3539 local_paca->kvm_hstate.dec_expires = dec + tb;
3540 if (local_paca->kvm_hstate.dec_expires < time_limit)
3541 time_limit = local_paca->kvm_hstate.dec_expires;
3543 vcpu->arch.ceded = 0;
3545 kvmhv_save_host_pmu(); /* saves it to PACA kvm_hstate */
3547 kvmppc_subcore_enter_guest();
3549 vc->entry_exit_map = 1;
3552 if (vcpu->arch.vpa.pinned_addr) {
3553 struct lppaca *lp = vcpu->arch.vpa.pinned_addr;
3554 u32 yield_count = be32_to_cpu(lp->yield_count) + 1;
3555 lp->yield_count = cpu_to_be32(yield_count);
3556 vcpu->arch.vpa.dirty = 1;
3559 if (cpu_has_feature(CPU_FTR_TM) ||
3560 cpu_has_feature(CPU_FTR_P9_TM_HV_ASSIST))
3561 kvmppc_restore_tm_hv(vcpu, vcpu->arch.shregs.msr, true);
3563 #ifdef CONFIG_PPC_PSERIES
3564 if (kvmhv_on_pseries()) {
3566 if (vcpu->arch.vpa.pinned_addr) {
3567 struct lppaca *lp = vcpu->arch.vpa.pinned_addr;
3568 get_lppaca()->pmcregs_in_use = lp->pmcregs_in_use;
3570 get_lppaca()->pmcregs_in_use = 1;
3575 kvmhv_load_guest_pmu(vcpu);
3577 msr_check_and_set(MSR_FP | MSR_VEC | MSR_VSX);
3578 load_fp_state(&vcpu->arch.fp);
3579 #ifdef CONFIG_ALTIVEC
3580 load_vr_state(&vcpu->arch.vr);
3582 mtspr(SPRN_VRSAVE, vcpu->arch.vrsave);
3584 mtspr(SPRN_DSCR, vcpu->arch.dscr);
3585 mtspr(SPRN_IAMR, vcpu->arch.iamr);
3586 mtspr(SPRN_PSPB, vcpu->arch.pspb);
3587 mtspr(SPRN_FSCR, vcpu->arch.fscr);
3588 mtspr(SPRN_TAR, vcpu->arch.tar);
3589 mtspr(SPRN_EBBHR, vcpu->arch.ebbhr);
3590 mtspr(SPRN_EBBRR, vcpu->arch.ebbrr);
3591 mtspr(SPRN_BESCR, vcpu->arch.bescr);
3592 mtspr(SPRN_WORT, vcpu->arch.wort);
3593 mtspr(SPRN_TIDR, vcpu->arch.tid);
3594 mtspr(SPRN_DAR, vcpu->arch.shregs.dar);
3595 mtspr(SPRN_DSISR, vcpu->arch.shregs.dsisr);
3596 mtspr(SPRN_AMR, vcpu->arch.amr);
3597 mtspr(SPRN_UAMOR, vcpu->arch.uamor);
3599 if (!(vcpu->arch.ctrl & 1))
3600 mtspr(SPRN_CTRLT, mfspr(SPRN_CTRLF) & ~1);
3602 mtspr(SPRN_DEC, vcpu->arch.dec_expires - mftb());
3604 if (kvmhv_on_pseries()) {
3606 * We need to save and restore the guest visible part of the
3607 * psscr (i.e. using SPRN_PSSCR_PR) since the hypervisor
3608 * doesn't do this for us. Note only required if pseries since
3609 * this is done in kvmhv_load_hv_regs_and_go() below otherwise.
3611 unsigned long host_psscr;
3612 /* call our hypervisor to load up HV regs and go */
3613 struct hv_guest_state hvregs;
3615 host_psscr = mfspr(SPRN_PSSCR_PR);
3616 mtspr(SPRN_PSSCR_PR, vcpu->arch.psscr);
3617 kvmhv_save_hv_regs(vcpu, &hvregs);
3619 vcpu->arch.regs.msr = vcpu->arch.shregs.msr;
3620 hvregs.version = HV_GUEST_STATE_VERSION;
3621 if (vcpu->arch.nested) {
3622 hvregs.lpid = vcpu->arch.nested->shadow_lpid;
3623 hvregs.vcpu_token = vcpu->arch.nested_vcpu_id;
3625 hvregs.lpid = vcpu->kvm->arch.lpid;
3626 hvregs.vcpu_token = vcpu->vcpu_id;
3628 hvregs.hdec_expiry = time_limit;
3629 trap = plpar_hcall_norets(H_ENTER_NESTED, __pa(&hvregs),
3630 __pa(&vcpu->arch.regs));
3631 kvmhv_restore_hv_return_state(vcpu, &hvregs);
3632 vcpu->arch.shregs.msr = vcpu->arch.regs.msr;
3633 vcpu->arch.shregs.dar = mfspr(SPRN_DAR);
3634 vcpu->arch.shregs.dsisr = mfspr(SPRN_DSISR);
3635 vcpu->arch.psscr = mfspr(SPRN_PSSCR_PR);
3636 mtspr(SPRN_PSSCR_PR, host_psscr);
3638 /* H_CEDE has to be handled now, not later */
3639 if (trap == BOOK3S_INTERRUPT_SYSCALL && !vcpu->arch.nested &&
3640 kvmppc_get_gpr(vcpu, 3) == H_CEDE) {
3641 kvmppc_nested_cede(vcpu);
3642 kvmppc_set_gpr(vcpu, 3, 0);
3646 trap = kvmhv_load_hv_regs_and_go(vcpu, time_limit, lpcr);
3649 vcpu->arch.slb_max = 0;
3650 dec = mfspr(SPRN_DEC);
3651 if (!(lpcr & LPCR_LD)) /* Sign extend if not using large decrementer */
3654 vcpu->arch.dec_expires = dec + tb;
3656 vcpu->arch.thread_cpu = -1;
3657 /* Save guest CTRL register, set runlatch to 1 */
3658 vcpu->arch.ctrl = mfspr(SPRN_CTRLF);
3659 if (!(vcpu->arch.ctrl & 1))
3660 mtspr(SPRN_CTRLT, vcpu->arch.ctrl | 1);
3662 vcpu->arch.iamr = mfspr(SPRN_IAMR);
3663 vcpu->arch.pspb = mfspr(SPRN_PSPB);
3664 vcpu->arch.fscr = mfspr(SPRN_FSCR);
3665 vcpu->arch.tar = mfspr(SPRN_TAR);
3666 vcpu->arch.ebbhr = mfspr(SPRN_EBBHR);
3667 vcpu->arch.ebbrr = mfspr(SPRN_EBBRR);
3668 vcpu->arch.bescr = mfspr(SPRN_BESCR);
3669 vcpu->arch.wort = mfspr(SPRN_WORT);
3670 vcpu->arch.tid = mfspr(SPRN_TIDR);
3671 vcpu->arch.amr = mfspr(SPRN_AMR);
3672 vcpu->arch.uamor = mfspr(SPRN_UAMOR);
3673 vcpu->arch.dscr = mfspr(SPRN_DSCR);
3675 mtspr(SPRN_PSPB, 0);
3676 mtspr(SPRN_WORT, 0);
3677 mtspr(SPRN_UAMOR, 0);
3678 mtspr(SPRN_DSCR, host_dscr);
3679 mtspr(SPRN_TIDR, host_tidr);
3680 mtspr(SPRN_IAMR, host_iamr);
3681 mtspr(SPRN_PSPB, 0);
3683 if (host_amr != vcpu->arch.amr)
3684 mtspr(SPRN_AMR, host_amr);
3686 msr_check_and_set(MSR_FP | MSR_VEC | MSR_VSX);
3687 store_fp_state(&vcpu->arch.fp);
3688 #ifdef CONFIG_ALTIVEC
3689 store_vr_state(&vcpu->arch.vr);
3691 vcpu->arch.vrsave = mfspr(SPRN_VRSAVE);
3693 if (cpu_has_feature(CPU_FTR_TM) ||
3694 cpu_has_feature(CPU_FTR_P9_TM_HV_ASSIST))
3695 kvmppc_save_tm_hv(vcpu, vcpu->arch.shregs.msr, true);
3698 if (vcpu->arch.vpa.pinned_addr) {
3699 struct lppaca *lp = vcpu->arch.vpa.pinned_addr;
3700 u32 yield_count = be32_to_cpu(lp->yield_count) + 1;
3701 lp->yield_count = cpu_to_be32(yield_count);
3702 vcpu->arch.vpa.dirty = 1;
3703 save_pmu = lp->pmcregs_in_use;
3705 /* Must save pmu if this guest is capable of running nested guests */
3706 save_pmu |= nesting_enabled(vcpu->kvm);
3708 kvmhv_save_guest_pmu(vcpu, save_pmu);
3709 #ifdef CONFIG_PPC_PSERIES
3710 if (kvmhv_on_pseries()) {
3712 get_lppaca()->pmcregs_in_use = ppc_get_pmu_inuse();
3717 vc->entry_exit_map = 0x101;
3720 mtspr(SPRN_DEC, local_paca->kvm_hstate.dec_expires - mftb());
3721 mtspr(SPRN_SPRG_VDSO_WRITE, local_paca->sprg_vdso);
3723 kvmhv_load_host_pmu();
3725 kvmppc_subcore_exit_guest();
3731 * Wait for some other vcpu thread to execute us, and
3732 * wake us up when we need to handle something in the host.
3734 static void kvmppc_wait_for_exec(struct kvmppc_vcore *vc,
3735 struct kvm_vcpu *vcpu, int wait_state)
3739 prepare_to_wait(&vcpu->arch.cpu_run, &wait, wait_state);
3740 if (vcpu->arch.state == KVMPPC_VCPU_RUNNABLE) {
3741 spin_unlock(&vc->lock);
3743 spin_lock(&vc->lock);
3745 finish_wait(&vcpu->arch.cpu_run, &wait);
3748 static void grow_halt_poll_ns(struct kvmppc_vcore *vc)
3750 if (!halt_poll_ns_grow)
3753 vc->halt_poll_ns *= halt_poll_ns_grow;
3754 if (vc->halt_poll_ns < halt_poll_ns_grow_start)
3755 vc->halt_poll_ns = halt_poll_ns_grow_start;
3758 static void shrink_halt_poll_ns(struct kvmppc_vcore *vc)
3760 if (halt_poll_ns_shrink == 0)
3761 vc->halt_poll_ns = 0;
3763 vc->halt_poll_ns /= halt_poll_ns_shrink;
3766 #ifdef CONFIG_KVM_XICS
3767 static inline bool xive_interrupt_pending(struct kvm_vcpu *vcpu)
3769 if (!xics_on_xive())
3771 return vcpu->arch.irq_pending || vcpu->arch.xive_saved_state.pipr <
3772 vcpu->arch.xive_saved_state.cppr;
3775 static inline bool xive_interrupt_pending(struct kvm_vcpu *vcpu)
3779 #endif /* CONFIG_KVM_XICS */
3781 static bool kvmppc_vcpu_woken(struct kvm_vcpu *vcpu)
3783 if (vcpu->arch.pending_exceptions || vcpu->arch.prodded ||
3784 kvmppc_doorbell_pending(vcpu) || xive_interrupt_pending(vcpu))
3791 * Check to see if any of the runnable vcpus on the vcore have pending
3792 * exceptions or are no longer ceded
3794 static int kvmppc_vcore_check_block(struct kvmppc_vcore *vc)
3796 struct kvm_vcpu *vcpu;
3799 for_each_runnable_thread(i, vcpu, vc) {
3800 if (!vcpu->arch.ceded || kvmppc_vcpu_woken(vcpu))
3808 * All the vcpus in this vcore are idle, so wait for a decrementer
3809 * or external interrupt to one of the vcpus. vc->lock is held.
3811 static void kvmppc_vcore_blocked(struct kvmppc_vcore *vc)
3813 ktime_t cur, start_poll, start_wait;
3816 DECLARE_SWAITQUEUE(wait);
3818 /* Poll for pending exceptions and ceded state */
3819 cur = start_poll = ktime_get();
3820 if (vc->halt_poll_ns) {
3821 ktime_t stop = ktime_add_ns(start_poll, vc->halt_poll_ns);
3822 ++vc->runner->stat.halt_attempted_poll;
3824 vc->vcore_state = VCORE_POLLING;
3825 spin_unlock(&vc->lock);
3828 if (kvmppc_vcore_check_block(vc)) {
3833 } while (single_task_running() && ktime_before(cur, stop));
3835 spin_lock(&vc->lock);
3836 vc->vcore_state = VCORE_INACTIVE;
3839 ++vc->runner->stat.halt_successful_poll;
3844 prepare_to_swait_exclusive(&vc->wq, &wait, TASK_INTERRUPTIBLE);
3846 if (kvmppc_vcore_check_block(vc)) {
3847 finish_swait(&vc->wq, &wait);
3849 /* If we polled, count this as a successful poll */
3850 if (vc->halt_poll_ns)
3851 ++vc->runner->stat.halt_successful_poll;
3855 start_wait = ktime_get();
3857 vc->vcore_state = VCORE_SLEEPING;
3858 trace_kvmppc_vcore_blocked(vc, 0);
3859 spin_unlock(&vc->lock);
3861 finish_swait(&vc->wq, &wait);
3862 spin_lock(&vc->lock);
3863 vc->vcore_state = VCORE_INACTIVE;
3864 trace_kvmppc_vcore_blocked(vc, 1);
3865 ++vc->runner->stat.halt_successful_wait;
3870 block_ns = ktime_to_ns(cur) - ktime_to_ns(start_poll);
3872 /* Attribute wait time */
3874 vc->runner->stat.halt_wait_ns +=
3875 ktime_to_ns(cur) - ktime_to_ns(start_wait);
3876 /* Attribute failed poll time */
3877 if (vc->halt_poll_ns)
3878 vc->runner->stat.halt_poll_fail_ns +=
3879 ktime_to_ns(start_wait) -
3880 ktime_to_ns(start_poll);
3882 /* Attribute successful poll time */
3883 if (vc->halt_poll_ns)
3884 vc->runner->stat.halt_poll_success_ns +=
3886 ktime_to_ns(start_poll);
3889 /* Adjust poll time */
3891 if (block_ns <= vc->halt_poll_ns)
3893 /* We slept and blocked for longer than the max halt time */
3894 else if (vc->halt_poll_ns && block_ns > halt_poll_ns)
3895 shrink_halt_poll_ns(vc);
3896 /* We slept and our poll time is too small */
3897 else if (vc->halt_poll_ns < halt_poll_ns &&
3898 block_ns < halt_poll_ns)
3899 grow_halt_poll_ns(vc);
3900 if (vc->halt_poll_ns > halt_poll_ns)
3901 vc->halt_poll_ns = halt_poll_ns;
3903 vc->halt_poll_ns = 0;
3905 trace_kvmppc_vcore_wakeup(do_sleep, block_ns);
3909 * This never fails for a radix guest, as none of the operations it does
3910 * for a radix guest can fail or have a way to report failure.
3911 * kvmhv_run_single_vcpu() relies on this fact.
3913 static int kvmhv_setup_mmu(struct kvm_vcpu *vcpu)
3916 struct kvm *kvm = vcpu->kvm;
3918 mutex_lock(&kvm->arch.mmu_setup_lock);
3919 if (!kvm->arch.mmu_ready) {
3920 if (!kvm_is_radix(kvm))
3921 r = kvmppc_hv_setup_htab_rma(vcpu);
3923 if (cpu_has_feature(CPU_FTR_ARCH_300))
3924 kvmppc_setup_partition_table(kvm);
3925 kvm->arch.mmu_ready = 1;
3928 mutex_unlock(&kvm->arch.mmu_setup_lock);
3932 static int kvmppc_run_vcpu(struct kvm_run *kvm_run, struct kvm_vcpu *vcpu)
3935 struct kvmppc_vcore *vc;
3938 trace_kvmppc_run_vcpu_enter(vcpu);
3940 kvm_run->exit_reason = 0;
3941 vcpu->arch.ret = RESUME_GUEST;
3942 vcpu->arch.trap = 0;
3943 kvmppc_update_vpas(vcpu);
3946 * Synchronize with other threads in this virtual core
3948 vc = vcpu->arch.vcore;
3949 spin_lock(&vc->lock);
3950 vcpu->arch.ceded = 0;
3951 vcpu->arch.run_task = current;
3952 vcpu->arch.kvm_run = kvm_run;
3953 vcpu->arch.stolen_logged = vcore_stolen_time(vc, mftb());
3954 vcpu->arch.state = KVMPPC_VCPU_RUNNABLE;
3955 vcpu->arch.busy_preempt = TB_NIL;
3956 WRITE_ONCE(vc->runnable_threads[vcpu->arch.ptid], vcpu);
3960 * This happens the first time this is called for a vcpu.
3961 * If the vcore is already running, we may be able to start
3962 * this thread straight away and have it join in.
3964 if (!signal_pending(current)) {
3965 if ((vc->vcore_state == VCORE_PIGGYBACK ||
3966 vc->vcore_state == VCORE_RUNNING) &&
3967 !VCORE_IS_EXITING(vc)) {
3968 kvmppc_create_dtl_entry(vcpu, vc);
3969 kvmppc_start_thread(vcpu, vc);
3970 trace_kvm_guest_enter(vcpu);
3971 } else if (vc->vcore_state == VCORE_SLEEPING) {
3972 swake_up_one(&vc->wq);
3977 while (vcpu->arch.state == KVMPPC_VCPU_RUNNABLE &&
3978 !signal_pending(current)) {
3979 /* See if the MMU is ready to go */
3980 if (!vcpu->kvm->arch.mmu_ready) {
3981 spin_unlock(&vc->lock);
3982 r = kvmhv_setup_mmu(vcpu);
3983 spin_lock(&vc->lock);
3985 kvm_run->exit_reason = KVM_EXIT_FAIL_ENTRY;
3986 kvm_run->fail_entry.
3987 hardware_entry_failure_reason = 0;
3993 if (vc->vcore_state == VCORE_PREEMPT && vc->runner == NULL)
3994 kvmppc_vcore_end_preempt(vc);
3996 if (vc->vcore_state != VCORE_INACTIVE) {
3997 kvmppc_wait_for_exec(vc, vcpu, TASK_INTERRUPTIBLE);
4000 for_each_runnable_thread(i, v, vc) {
4001 kvmppc_core_prepare_to_enter(v);
4002 if (signal_pending(v->arch.run_task)) {
4003 kvmppc_remove_runnable(vc, v);
4004 v->stat.signal_exits++;
4005 v->arch.kvm_run->exit_reason = KVM_EXIT_INTR;
4006 v->arch.ret = -EINTR;
4007 wake_up(&v->arch.cpu_run);
4010 if (!vc->n_runnable || vcpu->arch.state != KVMPPC_VCPU_RUNNABLE)
4013 for_each_runnable_thread(i, v, vc) {
4014 if (!kvmppc_vcpu_woken(v))
4015 n_ceded += v->arch.ceded;
4020 if (n_ceded == vc->n_runnable) {
4021 kvmppc_vcore_blocked(vc);
4022 } else if (need_resched()) {
4023 kvmppc_vcore_preempt(vc);
4024 /* Let something else run */
4025 cond_resched_lock(&vc->lock);
4026 if (vc->vcore_state == VCORE_PREEMPT)
4027 kvmppc_vcore_end_preempt(vc);
4029 kvmppc_run_core(vc);
4034 while (vcpu->arch.state == KVMPPC_VCPU_RUNNABLE &&
4035 (vc->vcore_state == VCORE_RUNNING ||
4036 vc->vcore_state == VCORE_EXITING ||
4037 vc->vcore_state == VCORE_PIGGYBACK))
4038 kvmppc_wait_for_exec(vc, vcpu, TASK_UNINTERRUPTIBLE);
4040 if (vc->vcore_state == VCORE_PREEMPT && vc->runner == NULL)
4041 kvmppc_vcore_end_preempt(vc);
4043 if (vcpu->arch.state == KVMPPC_VCPU_RUNNABLE) {
4044 kvmppc_remove_runnable(vc, vcpu);
4045 vcpu->stat.signal_exits++;
4046 kvm_run->exit_reason = KVM_EXIT_INTR;
4047 vcpu->arch.ret = -EINTR;
4050 if (vc->n_runnable && vc->vcore_state == VCORE_INACTIVE) {
4051 /* Wake up some vcpu to run the core */
4053 v = next_runnable_thread(vc, &i);
4054 wake_up(&v->arch.cpu_run);
4057 trace_kvmppc_run_vcpu_exit(vcpu, kvm_run);
4058 spin_unlock(&vc->lock);
4059 return vcpu->arch.ret;
4062 int kvmhv_run_single_vcpu(struct kvm_run *kvm_run,
4063 struct kvm_vcpu *vcpu, u64 time_limit,
4068 struct kvmppc_vcore *vc;
4069 struct kvm *kvm = vcpu->kvm;
4070 struct kvm_nested_guest *nested = vcpu->arch.nested;
4072 trace_kvmppc_run_vcpu_enter(vcpu);
4074 kvm_run->exit_reason = 0;
4075 vcpu->arch.ret = RESUME_GUEST;
4076 vcpu->arch.trap = 0;
4078 vc = vcpu->arch.vcore;
4079 vcpu->arch.ceded = 0;
4080 vcpu->arch.run_task = current;
4081 vcpu->arch.kvm_run = kvm_run;
4082 vcpu->arch.stolen_logged = vcore_stolen_time(vc, mftb());
4083 vcpu->arch.state = KVMPPC_VCPU_RUNNABLE;
4084 vcpu->arch.busy_preempt = TB_NIL;
4085 vcpu->arch.last_inst = KVM_INST_FETCH_FAILED;
4086 vc->runnable_threads[0] = vcpu;
4090 /* See if the MMU is ready to go */
4091 if (!kvm->arch.mmu_ready)
4092 kvmhv_setup_mmu(vcpu);
4097 kvmppc_update_vpas(vcpu);
4099 init_vcore_to_run(vc);
4100 vc->preempt_tb = TB_NIL;
4103 pcpu = smp_processor_id();
4105 kvmppc_prepare_radix_vcpu(vcpu, pcpu);
4107 local_irq_disable();
4109 if (signal_pending(current))
4111 if (lazy_irq_pending() || need_resched() || !kvm->arch.mmu_ready)
4115 kvmppc_core_prepare_to_enter(vcpu);
4116 if (vcpu->arch.doorbell_request) {
4119 vcpu->arch.doorbell_request = 0;
4121 if (test_bit(BOOK3S_IRQPRIO_EXTERNAL,
4122 &vcpu->arch.pending_exceptions))
4124 } else if (vcpu->arch.pending_exceptions ||
4125 vcpu->arch.doorbell_request ||
4126 xive_interrupt_pending(vcpu)) {
4127 vcpu->arch.ret = RESUME_HOST;
4131 kvmppc_clear_host_core(pcpu);
4133 local_paca->kvm_hstate.tid = 0;
4134 local_paca->kvm_hstate.napping = 0;
4135 local_paca->kvm_hstate.kvm_split_mode = NULL;
4136 kvmppc_start_thread(vcpu, vc);
4137 kvmppc_create_dtl_entry(vcpu, vc);
4138 trace_kvm_guest_enter(vcpu);
4140 vc->vcore_state = VCORE_RUNNING;
4141 trace_kvmppc_run_core(vc, 0);
4143 if (cpu_has_feature(CPU_FTR_HVMODE)) {
4144 lpid = nested ? nested->shadow_lpid : kvm->arch.lpid;
4145 mtspr(SPRN_LPID, lpid);
4147 kvmppc_check_need_tlb_flush(kvm, pcpu, nested);
4150 guest_enter_irqoff();
4152 srcu_idx = srcu_read_lock(&kvm->srcu);
4154 this_cpu_disable_ftrace();
4156 /* Tell lockdep that we're about to enable interrupts */
4157 trace_hardirqs_on();
4159 trap = kvmhv_p9_guest_entry(vcpu, time_limit, lpcr);
4160 vcpu->arch.trap = trap;
4162 trace_hardirqs_off();
4164 this_cpu_enable_ftrace();
4166 srcu_read_unlock(&kvm->srcu, srcu_idx);
4168 if (cpu_has_feature(CPU_FTR_HVMODE)) {
4169 mtspr(SPRN_LPID, kvm->arch.host_lpid);
4173 set_irq_happened(trap);
4175 kvmppc_set_host_core(pcpu);
4180 cpumask_clear_cpu(pcpu, &kvm->arch.cpu_in_guest);
4185 * cancel pending decrementer exception if DEC is now positive, or if
4186 * entering a nested guest in which case the decrementer is now owned
4187 * by L2 and the L1 decrementer is provided in hdec_expires
4189 if (kvmppc_core_pending_dec(vcpu) &&
4190 ((get_tb() < vcpu->arch.dec_expires) ||
4191 (trap == BOOK3S_INTERRUPT_SYSCALL &&
4192 kvmppc_get_gpr(vcpu, 3) == H_ENTER_NESTED)))
4193 kvmppc_core_dequeue_dec(vcpu);
4195 trace_kvm_guest_exit(vcpu);
4199 r = kvmppc_handle_exit_hv(kvm_run, vcpu, current);
4201 r = kvmppc_handle_nested_exit(kvm_run, vcpu);
4205 if (is_kvmppc_resume_guest(r) && vcpu->arch.ceded &&
4206 !kvmppc_vcpu_woken(vcpu)) {
4207 kvmppc_set_timer(vcpu);
4208 while (vcpu->arch.ceded && !kvmppc_vcpu_woken(vcpu)) {
4209 if (signal_pending(current)) {
4210 vcpu->stat.signal_exits++;
4211 kvm_run->exit_reason = KVM_EXIT_INTR;
4212 vcpu->arch.ret = -EINTR;
4215 spin_lock(&vc->lock);
4216 kvmppc_vcore_blocked(vc);
4217 spin_unlock(&vc->lock);
4220 vcpu->arch.ceded = 0;
4222 vc->vcore_state = VCORE_INACTIVE;
4223 trace_kvmppc_run_core(vc, 1);
4226 kvmppc_remove_runnable(vc, vcpu);
4227 trace_kvmppc_run_vcpu_exit(vcpu, kvm_run);
4229 return vcpu->arch.ret;
4232 vcpu->stat.signal_exits++;
4233 kvm_run->exit_reason = KVM_EXIT_INTR;
4234 vcpu->arch.ret = -EINTR;
4241 static int kvmppc_vcpu_run_hv(struct kvm_run *run, struct kvm_vcpu *vcpu)
4245 unsigned long ebb_regs[3] = {}; /* shut up GCC */
4246 unsigned long user_tar = 0;
4247 unsigned int user_vrsave;
4250 if (!vcpu->arch.sane) {
4251 run->exit_reason = KVM_EXIT_INTERNAL_ERROR;
4256 * Don't allow entry with a suspended transaction, because
4257 * the guest entry/exit code will lose it.
4258 * If the guest has TM enabled, save away their TM-related SPRs
4259 * (they will get restored by the TM unavailable interrupt).
4261 #ifdef CONFIG_PPC_TRANSACTIONAL_MEM
4262 if (cpu_has_feature(CPU_FTR_TM) && current->thread.regs &&
4263 (current->thread.regs->msr & MSR_TM)) {
4264 if (MSR_TM_ACTIVE(current->thread.regs->msr)) {
4265 run->exit_reason = KVM_EXIT_FAIL_ENTRY;
4266 run->fail_entry.hardware_entry_failure_reason = 0;
4269 /* Enable TM so we can read the TM SPRs */
4270 mtmsr(mfmsr() | MSR_TM);
4271 current->thread.tm_tfhar = mfspr(SPRN_TFHAR);
4272 current->thread.tm_tfiar = mfspr(SPRN_TFIAR);
4273 current->thread.tm_texasr = mfspr(SPRN_TEXASR);
4274 current->thread.regs->msr &= ~MSR_TM;
4279 * Force online to 1 for the sake of old userspace which doesn't
4282 if (!vcpu->arch.online) {
4283 atomic_inc(&vcpu->arch.vcore->online_count);
4284 vcpu->arch.online = 1;
4287 kvmppc_core_prepare_to_enter(vcpu);
4289 /* No need to go into the guest when all we'll do is come back out */
4290 if (signal_pending(current)) {
4291 run->exit_reason = KVM_EXIT_INTR;
4296 atomic_inc(&kvm->arch.vcpus_running);
4297 /* Order vcpus_running vs. mmu_ready, see kvmppc_alloc_reset_hpt */
4300 flush_all_to_thread(current);
4302 /* Save userspace EBB and other register values */
4303 if (cpu_has_feature(CPU_FTR_ARCH_207S)) {
4304 ebb_regs[0] = mfspr(SPRN_EBBHR);
4305 ebb_regs[1] = mfspr(SPRN_EBBRR);
4306 ebb_regs[2] = mfspr(SPRN_BESCR);
4307 user_tar = mfspr(SPRN_TAR);
4309 user_vrsave = mfspr(SPRN_VRSAVE);
4311 vcpu->arch.wqp = &vcpu->arch.vcore->wq;
4312 vcpu->arch.pgdir = current->mm->pgd;
4313 vcpu->arch.state = KVMPPC_VCPU_BUSY_IN_HOST;
4317 * The early POWER9 chips that can't mix radix and HPT threads
4318 * on the same core also need the workaround for the problem
4319 * where the TLB would prefetch entries in the guest exit path
4320 * for radix guests using the guest PIDR value and LPID 0.
4321 * The workaround is in the old path (kvmppc_run_vcpu())
4322 * but not the new path (kvmhv_run_single_vcpu()).
4324 if (kvm->arch.threads_indep && kvm_is_radix(kvm) &&
4325 !no_mixing_hpt_and_radix)
4326 r = kvmhv_run_single_vcpu(run, vcpu, ~(u64)0,
4327 vcpu->arch.vcore->lpcr);
4329 r = kvmppc_run_vcpu(run, vcpu);
4331 if (run->exit_reason == KVM_EXIT_PAPR_HCALL &&
4332 !(vcpu->arch.shregs.msr & MSR_PR)) {
4333 trace_kvm_hcall_enter(vcpu);
4334 r = kvmppc_pseries_do_hcall(vcpu);
4335 trace_kvm_hcall_exit(vcpu, r);
4336 kvmppc_core_prepare_to_enter(vcpu);
4337 } else if (r == RESUME_PAGE_FAULT) {
4338 srcu_idx = srcu_read_lock(&kvm->srcu);
4339 r = kvmppc_book3s_hv_page_fault(run, vcpu,
4340 vcpu->arch.fault_dar, vcpu->arch.fault_dsisr);
4341 srcu_read_unlock(&kvm->srcu, srcu_idx);
4342 } else if (r == RESUME_PASSTHROUGH) {
4343 if (WARN_ON(xics_on_xive()))
4346 r = kvmppc_xics_rm_complete(vcpu, 0);
4348 } while (is_kvmppc_resume_guest(r));
4350 /* Restore userspace EBB and other register values */
4351 if (cpu_has_feature(CPU_FTR_ARCH_207S)) {
4352 mtspr(SPRN_EBBHR, ebb_regs[0]);
4353 mtspr(SPRN_EBBRR, ebb_regs[1]);
4354 mtspr(SPRN_BESCR, ebb_regs[2]);
4355 mtspr(SPRN_TAR, user_tar);
4356 mtspr(SPRN_FSCR, current->thread.fscr);
4358 mtspr(SPRN_VRSAVE, user_vrsave);
4360 vcpu->arch.state = KVMPPC_VCPU_NOTREADY;
4361 atomic_dec(&kvm->arch.vcpus_running);
4365 static void kvmppc_add_seg_page_size(struct kvm_ppc_one_seg_page_size **sps,
4366 int shift, int sllp)
4368 (*sps)->page_shift = shift;
4369 (*sps)->slb_enc = sllp;
4370 (*sps)->enc[0].page_shift = shift;
4371 (*sps)->enc[0].pte_enc = kvmppc_pgsize_lp_encoding(shift, shift);
4373 * Add 16MB MPSS support (may get filtered out by userspace)
4376 int penc = kvmppc_pgsize_lp_encoding(shift, 24);
4378 (*sps)->enc[1].page_shift = 24;
4379 (*sps)->enc[1].pte_enc = penc;
4385 static int kvm_vm_ioctl_get_smmu_info_hv(struct kvm *kvm,
4386 struct kvm_ppc_smmu_info *info)
4388 struct kvm_ppc_one_seg_page_size *sps;
4391 * POWER7, POWER8 and POWER9 all support 32 storage keys for data.
4392 * POWER7 doesn't support keys for instruction accesses,
4393 * POWER8 and POWER9 do.
4395 info->data_keys = 32;
4396 info->instr_keys = cpu_has_feature(CPU_FTR_ARCH_207S) ? 32 : 0;
4398 /* POWER7, 8 and 9 all have 1T segments and 32-entry SLB */
4399 info->flags = KVM_PPC_PAGE_SIZES_REAL | KVM_PPC_1T_SEGMENTS;
4400 info->slb_size = 32;
4402 /* We only support these sizes for now, and no muti-size segments */
4403 sps = &info->sps[0];
4404 kvmppc_add_seg_page_size(&sps, 12, 0);
4405 kvmppc_add_seg_page_size(&sps, 16, SLB_VSID_L | SLB_VSID_LP_01);
4406 kvmppc_add_seg_page_size(&sps, 24, SLB_VSID_L);
4408 /* If running as a nested hypervisor, we don't support HPT guests */
4409 if (kvmhv_on_pseries())
4410 info->flags |= KVM_PPC_NO_HASH;
4416 * Get (and clear) the dirty memory log for a memory slot.
4418 static int kvm_vm_ioctl_get_dirty_log_hv(struct kvm *kvm,
4419 struct kvm_dirty_log *log)
4421 struct kvm_memslots *slots;
4422 struct kvm_memory_slot *memslot;
4425 unsigned long *buf, *p;
4426 struct kvm_vcpu *vcpu;
4428 mutex_lock(&kvm->slots_lock);
4431 if (log->slot >= KVM_USER_MEM_SLOTS)
4434 slots = kvm_memslots(kvm);
4435 memslot = id_to_memslot(slots, log->slot);
4437 if (!memslot->dirty_bitmap)
4441 * Use second half of bitmap area because both HPT and radix
4442 * accumulate bits in the first half.
4444 n = kvm_dirty_bitmap_bytes(memslot);
4445 buf = memslot->dirty_bitmap + n / sizeof(long);
4448 if (kvm_is_radix(kvm))
4449 r = kvmppc_hv_get_dirty_log_radix(kvm, memslot, buf);
4451 r = kvmppc_hv_get_dirty_log_hpt(kvm, memslot, buf);
4456 * We accumulate dirty bits in the first half of the
4457 * memslot's dirty_bitmap area, for when pages are paged
4458 * out or modified by the host directly. Pick up these
4459 * bits and add them to the map.
4461 p = memslot->dirty_bitmap;
4462 for (i = 0; i < n / sizeof(long); ++i)
4463 buf[i] |= xchg(&p[i], 0);
4465 /* Harvest dirty bits from VPA and DTL updates */
4466 /* Note: we never modify the SLB shadow buffer areas */
4467 kvm_for_each_vcpu(i, vcpu, kvm) {
4468 spin_lock(&vcpu->arch.vpa_update_lock);
4469 kvmppc_harvest_vpa_dirty(&vcpu->arch.vpa, memslot, buf);
4470 kvmppc_harvest_vpa_dirty(&vcpu->arch.dtl, memslot, buf);
4471 spin_unlock(&vcpu->arch.vpa_update_lock);
4475 if (copy_to_user(log->dirty_bitmap, buf, n))
4480 mutex_unlock(&kvm->slots_lock);
4484 static void kvmppc_core_free_memslot_hv(struct kvm_memory_slot *free,
4485 struct kvm_memory_slot *dont)
4487 if (!dont || free->arch.rmap != dont->arch.rmap) {
4488 vfree(free->arch.rmap);
4489 free->arch.rmap = NULL;
4493 static int kvmppc_core_create_memslot_hv(struct kvm_memory_slot *slot,
4494 unsigned long npages)
4496 slot->arch.rmap = vzalloc(array_size(npages, sizeof(*slot->arch.rmap)));
4497 if (!slot->arch.rmap)
4503 static int kvmppc_core_prepare_memory_region_hv(struct kvm *kvm,
4504 struct kvm_memory_slot *memslot,
4505 const struct kvm_userspace_memory_region *mem)
4510 static void kvmppc_core_commit_memory_region_hv(struct kvm *kvm,
4511 const struct kvm_userspace_memory_region *mem,
4512 const struct kvm_memory_slot *old,
4513 const struct kvm_memory_slot *new,
4514 enum kvm_mr_change change)
4516 unsigned long npages = mem->memory_size >> PAGE_SHIFT;
4519 * If we are making a new memslot, it might make
4520 * some address that was previously cached as emulated
4521 * MMIO be no longer emulated MMIO, so invalidate
4522 * all the caches of emulated MMIO translations.
4525 atomic64_inc(&kvm->arch.mmio_update);
4528 * For change == KVM_MR_MOVE or KVM_MR_DELETE, higher levels
4529 * have already called kvm_arch_flush_shadow_memslot() to
4530 * flush shadow mappings. For KVM_MR_CREATE we have no
4531 * previous mappings. So the only case to handle is
4532 * KVM_MR_FLAGS_ONLY when the KVM_MEM_LOG_DIRTY_PAGES bit
4534 * For radix guests, we flush on setting KVM_MEM_LOG_DIRTY_PAGES
4535 * to get rid of any THP PTEs in the partition-scoped page tables
4536 * so we can track dirtiness at the page level; we flush when
4537 * clearing KVM_MEM_LOG_DIRTY_PAGES so that we can go back to
4540 if (change == KVM_MR_FLAGS_ONLY && kvm_is_radix(kvm) &&
4541 ((new->flags ^ old->flags) & KVM_MEM_LOG_DIRTY_PAGES))
4542 kvmppc_radix_flush_memslot(kvm, old);
4546 * Update LPCR values in kvm->arch and in vcores.
4547 * Caller must hold kvm->arch.mmu_setup_lock (for mutual exclusion
4548 * of kvm->arch.lpcr update).
4550 void kvmppc_update_lpcr(struct kvm *kvm, unsigned long lpcr, unsigned long mask)
4555 if ((kvm->arch.lpcr & mask) == lpcr)
4558 kvm->arch.lpcr = (kvm->arch.lpcr & ~mask) | lpcr;
4560 for (i = 0; i < KVM_MAX_VCORES; ++i) {
4561 struct kvmppc_vcore *vc = kvm->arch.vcores[i];
4564 spin_lock(&vc->lock);
4565 vc->lpcr = (vc->lpcr & ~mask) | lpcr;
4566 spin_unlock(&vc->lock);
4567 if (++cores_done >= kvm->arch.online_vcores)
4572 static void kvmppc_mmu_destroy_hv(struct kvm_vcpu *vcpu)
4577 void kvmppc_setup_partition_table(struct kvm *kvm)
4579 unsigned long dw0, dw1;
4581 if (!kvm_is_radix(kvm)) {
4582 /* PS field - page size for VRMA */
4583 dw0 = ((kvm->arch.vrma_slb_v & SLB_VSID_L) >> 1) |
4584 ((kvm->arch.vrma_slb_v & SLB_VSID_LP) << 1);
4585 /* HTABSIZE and HTABORG fields */
4586 dw0 |= kvm->arch.sdr1;
4588 /* Second dword as set by userspace */
4589 dw1 = kvm->arch.process_table;
4591 dw0 = PATB_HR | radix__get_tree_size() |
4592 __pa(kvm->arch.pgtable) | RADIX_PGD_INDEX_SIZE;
4593 dw1 = PATB_GR | kvm->arch.process_table;
4595 kvmhv_set_ptbl_entry(kvm->arch.lpid, dw0, dw1);
4599 * Set up HPT (hashed page table) and RMA (real-mode area).
4600 * Must be called with kvm->arch.mmu_setup_lock held.
4602 static int kvmppc_hv_setup_htab_rma(struct kvm_vcpu *vcpu)
4605 struct kvm *kvm = vcpu->kvm;
4607 struct kvm_memory_slot *memslot;
4608 struct vm_area_struct *vma;
4609 unsigned long lpcr = 0, senc;
4610 unsigned long psize, porder;
4613 /* Allocate hashed page table (if not done already) and reset it */
4614 if (!kvm->arch.hpt.virt) {
4615 int order = KVM_DEFAULT_HPT_ORDER;
4616 struct kvm_hpt_info info;
4618 err = kvmppc_allocate_hpt(&info, order);
4619 /* If we get here, it means userspace didn't specify a
4620 * size explicitly. So, try successively smaller
4621 * sizes if the default failed. */
4622 while ((err == -ENOMEM) && --order >= PPC_MIN_HPT_ORDER)
4623 err = kvmppc_allocate_hpt(&info, order);
4626 pr_err("KVM: Couldn't alloc HPT\n");
4630 kvmppc_set_hpt(kvm, &info);
4633 /* Look up the memslot for guest physical address 0 */
4634 srcu_idx = srcu_read_lock(&kvm->srcu);
4635 memslot = gfn_to_memslot(kvm, 0);
4637 /* We must have some memory at 0 by now */
4639 if (!memslot || (memslot->flags & KVM_MEMSLOT_INVALID))
4642 /* Look up the VMA for the start of this memory slot */
4643 hva = memslot->userspace_addr;
4644 down_read(¤t->mm->mmap_sem);
4645 vma = find_vma(current->mm, hva);
4646 if (!vma || vma->vm_start > hva || (vma->vm_flags & VM_IO))
4649 psize = vma_kernel_pagesize(vma);
4651 up_read(¤t->mm->mmap_sem);
4653 /* We can handle 4k, 64k or 16M pages in the VRMA */
4654 if (psize >= 0x1000000)
4656 else if (psize >= 0x10000)
4660 porder = __ilog2(psize);
4662 senc = slb_pgsize_encoding(psize);
4663 kvm->arch.vrma_slb_v = senc | SLB_VSID_B_1T |
4664 (VRMA_VSID << SLB_VSID_SHIFT_1T);
4665 /* Create HPTEs in the hash page table for the VRMA */
4666 kvmppc_map_vrma(vcpu, memslot, porder);
4668 /* Update VRMASD field in the LPCR */
4669 if (!cpu_has_feature(CPU_FTR_ARCH_300)) {
4670 /* the -4 is to account for senc values starting at 0x10 */
4671 lpcr = senc << (LPCR_VRMASD_SH - 4);
4672 kvmppc_update_lpcr(kvm, lpcr, LPCR_VRMASD);
4675 /* Order updates to kvm->arch.lpcr etc. vs. mmu_ready */
4679 srcu_read_unlock(&kvm->srcu, srcu_idx);
4684 up_read(¤t->mm->mmap_sem);
4689 * Must be called with kvm->arch.mmu_setup_lock held and
4690 * mmu_ready = 0 and no vcpus running.
4692 int kvmppc_switch_mmu_to_hpt(struct kvm *kvm)
4694 if (nesting_enabled(kvm))
4695 kvmhv_release_all_nested(kvm);
4696 kvmppc_rmap_reset(kvm);
4697 kvm->arch.process_table = 0;
4698 /* Mutual exclusion with kvm_unmap_hva_range etc. */
4699 spin_lock(&kvm->mmu_lock);
4700 kvm->arch.radix = 0;
4701 spin_unlock(&kvm->mmu_lock);
4702 kvmppc_free_radix(kvm);
4703 kvmppc_update_lpcr(kvm, LPCR_VPM1,
4704 LPCR_VPM1 | LPCR_UPRT | LPCR_GTSE | LPCR_HR);
4709 * Must be called with kvm->arch.mmu_setup_lock held and
4710 * mmu_ready = 0 and no vcpus running.
4712 int kvmppc_switch_mmu_to_radix(struct kvm *kvm)
4716 err = kvmppc_init_vm_radix(kvm);
4719 kvmppc_rmap_reset(kvm);
4720 /* Mutual exclusion with kvm_unmap_hva_range etc. */
4721 spin_lock(&kvm->mmu_lock);
4722 kvm->arch.radix = 1;
4723 spin_unlock(&kvm->mmu_lock);
4724 kvmppc_free_hpt(&kvm->arch.hpt);
4725 kvmppc_update_lpcr(kvm, LPCR_UPRT | LPCR_GTSE | LPCR_HR,
4726 LPCR_VPM1 | LPCR_UPRT | LPCR_GTSE | LPCR_HR);
4730 #ifdef CONFIG_KVM_XICS
4732 * Allocate a per-core structure for managing state about which cores are
4733 * running in the host versus the guest and for exchanging data between
4734 * real mode KVM and CPU running in the host.
4735 * This is only done for the first VM.
4736 * The allocated structure stays even if all VMs have stopped.
4737 * It is only freed when the kvm-hv module is unloaded.
4738 * It's OK for this routine to fail, we just don't support host
4739 * core operations like redirecting H_IPI wakeups.
4741 void kvmppc_alloc_host_rm_ops(void)
4743 struct kvmppc_host_rm_ops *ops;
4744 unsigned long l_ops;
4748 /* Not the first time here ? */
4749 if (kvmppc_host_rm_ops_hv != NULL)
4752 ops = kzalloc(sizeof(struct kvmppc_host_rm_ops), GFP_KERNEL);
4756 size = cpu_nr_cores() * sizeof(struct kvmppc_host_rm_core);
4757 ops->rm_core = kzalloc(size, GFP_KERNEL);
4759 if (!ops->rm_core) {
4766 for (cpu = 0; cpu < nr_cpu_ids; cpu += threads_per_core) {
4767 if (!cpu_online(cpu))
4770 core = cpu >> threads_shift;
4771 ops->rm_core[core].rm_state.in_host = 1;
4774 ops->vcpu_kick = kvmppc_fast_vcpu_kick_hv;
4777 * Make the contents of the kvmppc_host_rm_ops structure visible
4778 * to other CPUs before we assign it to the global variable.
4779 * Do an atomic assignment (no locks used here), but if someone
4780 * beats us to it, just free our copy and return.
4783 l_ops = (unsigned long) ops;
4785 if (cmpxchg64((unsigned long *)&kvmppc_host_rm_ops_hv, 0, l_ops)) {
4787 kfree(ops->rm_core);
4792 cpuhp_setup_state_nocalls_cpuslocked(CPUHP_KVM_PPC_BOOK3S_PREPARE,
4793 "ppc/kvm_book3s:prepare",
4794 kvmppc_set_host_core,
4795 kvmppc_clear_host_core);
4799 void kvmppc_free_host_rm_ops(void)
4801 if (kvmppc_host_rm_ops_hv) {
4802 cpuhp_remove_state_nocalls(CPUHP_KVM_PPC_BOOK3S_PREPARE);
4803 kfree(kvmppc_host_rm_ops_hv->rm_core);
4804 kfree(kvmppc_host_rm_ops_hv);
4805 kvmppc_host_rm_ops_hv = NULL;
4810 static int kvmppc_core_init_vm_hv(struct kvm *kvm)
4812 unsigned long lpcr, lpid;
4816 mutex_init(&kvm->arch.mmu_setup_lock);
4818 /* Allocate the guest's logical partition ID */
4820 lpid = kvmppc_alloc_lpid();
4823 kvm->arch.lpid = lpid;
4825 kvmppc_alloc_host_rm_ops();
4827 kvmhv_vm_nested_init(kvm);
4830 * Since we don't flush the TLB when tearing down a VM,
4831 * and this lpid might have previously been used,
4832 * make sure we flush on each core before running the new VM.
4833 * On POWER9, the tlbie in mmu_partition_table_set_entry()
4834 * does this flush for us.
4836 if (!cpu_has_feature(CPU_FTR_ARCH_300))
4837 cpumask_setall(&kvm->arch.need_tlb_flush);
4839 /* Start out with the default set of hcalls enabled */
4840 memcpy(kvm->arch.enabled_hcalls, default_enabled_hcalls,
4841 sizeof(kvm->arch.enabled_hcalls));
4843 if (!cpu_has_feature(CPU_FTR_ARCH_300))
4844 kvm->arch.host_sdr1 = mfspr(SPRN_SDR1);
4846 /* Init LPCR for virtual RMA mode */
4847 if (cpu_has_feature(CPU_FTR_HVMODE)) {
4848 kvm->arch.host_lpid = mfspr(SPRN_LPID);
4849 kvm->arch.host_lpcr = lpcr = mfspr(SPRN_LPCR);
4850 lpcr &= LPCR_PECE | LPCR_LPES;
4854 lpcr |= (4UL << LPCR_DPFD_SH) | LPCR_HDICE |
4855 LPCR_VPM0 | LPCR_VPM1;
4856 kvm->arch.vrma_slb_v = SLB_VSID_B_1T |
4857 (VRMA_VSID << SLB_VSID_SHIFT_1T);
4858 /* On POWER8 turn on online bit to enable PURR/SPURR */
4859 if (cpu_has_feature(CPU_FTR_ARCH_207S))
4862 * On POWER9, VPM0 bit is reserved (VPM0=1 behaviour is assumed)
4863 * Set HVICE bit to enable hypervisor virtualization interrupts.
4864 * Set HEIC to prevent OS interrupts to go to hypervisor (should
4865 * be unnecessary but better safe than sorry in case we re-enable
4866 * EE in HV mode with this LPCR still set)
4868 if (cpu_has_feature(CPU_FTR_ARCH_300)) {
4870 lpcr |= LPCR_HVICE | LPCR_HEIC;
4873 * If xive is enabled, we route 0x500 interrupts directly
4881 * If the host uses radix, the guest starts out as radix.
4883 if (radix_enabled()) {
4884 kvm->arch.radix = 1;
4885 kvm->arch.mmu_ready = 1;
4887 lpcr |= LPCR_UPRT | LPCR_GTSE | LPCR_HR;
4888 ret = kvmppc_init_vm_radix(kvm);
4890 kvmppc_free_lpid(kvm->arch.lpid);
4893 kvmppc_setup_partition_table(kvm);
4896 kvm->arch.lpcr = lpcr;
4898 /* Initialization for future HPT resizes */
4899 kvm->arch.resize_hpt = NULL;
4902 * Work out how many sets the TLB has, for the use of
4903 * the TLB invalidation loop in book3s_hv_rmhandlers.S.
4905 if (radix_enabled())
4906 kvm->arch.tlb_sets = POWER9_TLB_SETS_RADIX; /* 128 */
4907 else if (cpu_has_feature(CPU_FTR_ARCH_300))
4908 kvm->arch.tlb_sets = POWER9_TLB_SETS_HASH; /* 256 */
4909 else if (cpu_has_feature(CPU_FTR_ARCH_207S))
4910 kvm->arch.tlb_sets = POWER8_TLB_SETS; /* 512 */
4912 kvm->arch.tlb_sets = POWER7_TLB_SETS; /* 128 */
4915 * Track that we now have a HV mode VM active. This blocks secondary
4916 * CPU threads from coming online.
4917 * On POWER9, we only need to do this if the "indep_threads_mode"
4918 * module parameter has been set to N.
4920 if (cpu_has_feature(CPU_FTR_ARCH_300)) {
4921 if (!indep_threads_mode && !cpu_has_feature(CPU_FTR_HVMODE)) {
4922 pr_warn("KVM: Ignoring indep_threads_mode=N in nested hypervisor\n");
4923 kvm->arch.threads_indep = true;
4925 kvm->arch.threads_indep = indep_threads_mode;
4928 if (!kvm->arch.threads_indep)
4929 kvm_hv_vm_activated();
4932 * Initialize smt_mode depending on processor.
4933 * POWER8 and earlier have to use "strict" threading, where
4934 * all vCPUs in a vcore have to run on the same (sub)core,
4935 * whereas on POWER9 the threads can each run a different
4938 if (!cpu_has_feature(CPU_FTR_ARCH_300))
4939 kvm->arch.smt_mode = threads_per_subcore;
4941 kvm->arch.smt_mode = 1;
4942 kvm->arch.emul_smt_mode = 1;
4945 * Create a debugfs directory for the VM
4947 snprintf(buf, sizeof(buf), "vm%d", current->pid);
4948 kvm->arch.debugfs_dir = debugfs_create_dir(buf, kvm_debugfs_dir);
4949 kvmppc_mmu_debugfs_init(kvm);
4950 if (radix_enabled())
4951 kvmhv_radix_debugfs_init(kvm);
4956 static void kvmppc_free_vcores(struct kvm *kvm)
4960 for (i = 0; i < KVM_MAX_VCORES; ++i)
4961 kfree(kvm->arch.vcores[i]);
4962 kvm->arch.online_vcores = 0;
4965 static void kvmppc_core_destroy_vm_hv(struct kvm *kvm)
4967 debugfs_remove_recursive(kvm->arch.debugfs_dir);
4969 if (!kvm->arch.threads_indep)
4970 kvm_hv_vm_deactivated();
4972 kvmppc_free_vcores(kvm);
4975 if (kvm_is_radix(kvm))
4976 kvmppc_free_radix(kvm);
4978 kvmppc_free_hpt(&kvm->arch.hpt);
4980 /* Perform global invalidation and return lpid to the pool */
4981 if (cpu_has_feature(CPU_FTR_ARCH_300)) {
4982 if (nesting_enabled(kvm))
4983 kvmhv_release_all_nested(kvm);
4984 kvm->arch.process_table = 0;
4985 kvmhv_set_ptbl_entry(kvm->arch.lpid, 0, 0);
4987 kvmppc_free_lpid(kvm->arch.lpid);
4989 kvmppc_free_pimap(kvm);
4992 /* We don't need to emulate any privileged instructions or dcbz */
4993 static int kvmppc_core_emulate_op_hv(struct kvm_run *run, struct kvm_vcpu *vcpu,
4994 unsigned int inst, int *advance)
4996 return EMULATE_FAIL;
4999 static int kvmppc_core_emulate_mtspr_hv(struct kvm_vcpu *vcpu, int sprn,
5002 return EMULATE_FAIL;
5005 static int kvmppc_core_emulate_mfspr_hv(struct kvm_vcpu *vcpu, int sprn,
5008 return EMULATE_FAIL;
5011 static int kvmppc_core_check_processor_compat_hv(void)
5013 if (cpu_has_feature(CPU_FTR_HVMODE) &&
5014 cpu_has_feature(CPU_FTR_ARCH_206))
5017 /* POWER9 in radix mode is capable of being a nested hypervisor. */
5018 if (cpu_has_feature(CPU_FTR_ARCH_300) && radix_enabled())
5024 #ifdef CONFIG_KVM_XICS
5026 void kvmppc_free_pimap(struct kvm *kvm)
5028 kfree(kvm->arch.pimap);
5031 static struct kvmppc_passthru_irqmap *kvmppc_alloc_pimap(void)
5033 return kzalloc(sizeof(struct kvmppc_passthru_irqmap), GFP_KERNEL);
5036 static int kvmppc_set_passthru_irq(struct kvm *kvm, int host_irq, int guest_gsi)
5038 struct irq_desc *desc;
5039 struct kvmppc_irq_map *irq_map;
5040 struct kvmppc_passthru_irqmap *pimap;
5041 struct irq_chip *chip;
5044 if (!kvm_irq_bypass)
5047 desc = irq_to_desc(host_irq);
5051 mutex_lock(&kvm->lock);
5053 pimap = kvm->arch.pimap;
5054 if (pimap == NULL) {
5055 /* First call, allocate structure to hold IRQ map */
5056 pimap = kvmppc_alloc_pimap();
5057 if (pimap == NULL) {
5058 mutex_unlock(&kvm->lock);
5061 kvm->arch.pimap = pimap;
5065 * For now, we only support interrupts for which the EOI operation
5066 * is an OPAL call followed by a write to XIRR, since that's
5067 * what our real-mode EOI code does, or a XIVE interrupt
5069 chip = irq_data_get_irq_chip(&desc->irq_data);
5070 if (!chip || !(is_pnv_opal_msi(chip) || is_xive_irq(chip))) {
5071 pr_warn("kvmppc_set_passthru_irq_hv: Could not assign IRQ map for (%d,%d)\n",
5072 host_irq, guest_gsi);
5073 mutex_unlock(&kvm->lock);
5078 * See if we already have an entry for this guest IRQ number.
5079 * If it's mapped to a hardware IRQ number, that's an error,
5080 * otherwise re-use this entry.
5082 for (i = 0; i < pimap->n_mapped; i++) {
5083 if (guest_gsi == pimap->mapped[i].v_hwirq) {
5084 if (pimap->mapped[i].r_hwirq) {
5085 mutex_unlock(&kvm->lock);
5092 if (i == KVMPPC_PIRQ_MAPPED) {
5093 mutex_unlock(&kvm->lock);
5094 return -EAGAIN; /* table is full */
5097 irq_map = &pimap->mapped[i];
5099 irq_map->v_hwirq = guest_gsi;
5100 irq_map->desc = desc;
5103 * Order the above two stores before the next to serialize with
5104 * the KVM real mode handler.
5107 irq_map->r_hwirq = desc->irq_data.hwirq;
5109 if (i == pimap->n_mapped)
5113 rc = kvmppc_xive_set_mapped(kvm, guest_gsi, desc);
5115 kvmppc_xics_set_mapped(kvm, guest_gsi, desc->irq_data.hwirq);
5117 irq_map->r_hwirq = 0;
5119 mutex_unlock(&kvm->lock);
5124 static int kvmppc_clr_passthru_irq(struct kvm *kvm, int host_irq, int guest_gsi)
5126 struct irq_desc *desc;
5127 struct kvmppc_passthru_irqmap *pimap;
5130 if (!kvm_irq_bypass)
5133 desc = irq_to_desc(host_irq);
5137 mutex_lock(&kvm->lock);
5138 if (!kvm->arch.pimap)
5141 pimap = kvm->arch.pimap;
5143 for (i = 0; i < pimap->n_mapped; i++) {
5144 if (guest_gsi == pimap->mapped[i].v_hwirq)
5148 if (i == pimap->n_mapped) {
5149 mutex_unlock(&kvm->lock);
5154 rc = kvmppc_xive_clr_mapped(kvm, guest_gsi, pimap->mapped[i].desc);
5156 kvmppc_xics_clr_mapped(kvm, guest_gsi, pimap->mapped[i].r_hwirq);
5158 /* invalidate the entry (what do do on error from the above ?) */
5159 pimap->mapped[i].r_hwirq = 0;
5162 * We don't free this structure even when the count goes to
5163 * zero. The structure is freed when we destroy the VM.
5166 mutex_unlock(&kvm->lock);
5170 static int kvmppc_irq_bypass_add_producer_hv(struct irq_bypass_consumer *cons,
5171 struct irq_bypass_producer *prod)
5174 struct kvm_kernel_irqfd *irqfd =
5175 container_of(cons, struct kvm_kernel_irqfd, consumer);
5177 irqfd->producer = prod;
5179 ret = kvmppc_set_passthru_irq(irqfd->kvm, prod->irq, irqfd->gsi);
5181 pr_info("kvmppc_set_passthru_irq (irq %d, gsi %d) fails: %d\n",
5182 prod->irq, irqfd->gsi, ret);
5187 static void kvmppc_irq_bypass_del_producer_hv(struct irq_bypass_consumer *cons,
5188 struct irq_bypass_producer *prod)
5191 struct kvm_kernel_irqfd *irqfd =
5192 container_of(cons, struct kvm_kernel_irqfd, consumer);
5194 irqfd->producer = NULL;
5197 * When producer of consumer is unregistered, we change back to
5198 * default external interrupt handling mode - KVM real mode
5199 * will switch back to host.
5201 ret = kvmppc_clr_passthru_irq(irqfd->kvm, prod->irq, irqfd->gsi);
5203 pr_warn("kvmppc_clr_passthru_irq (irq %d, gsi %d) fails: %d\n",
5204 prod->irq, irqfd->gsi, ret);
5208 static long kvm_arch_vm_ioctl_hv(struct file *filp,
5209 unsigned int ioctl, unsigned long arg)
5211 struct kvm *kvm __maybe_unused = filp->private_data;
5212 void __user *argp = (void __user *)arg;
5217 case KVM_PPC_ALLOCATE_HTAB: {
5220 /* If we're a nested hypervisor, we currently only support radix */
5221 if (kvmhv_on_pseries()) {
5227 if (get_user(htab_order, (u32 __user *)argp))
5229 r = kvmppc_alloc_reset_hpt(kvm, htab_order);
5236 case KVM_PPC_GET_HTAB_FD: {
5237 struct kvm_get_htab_fd ghf;
5240 if (copy_from_user(&ghf, argp, sizeof(ghf)))
5242 r = kvm_vm_ioctl_get_htab_fd(kvm, &ghf);
5246 case KVM_PPC_RESIZE_HPT_PREPARE: {
5247 struct kvm_ppc_resize_hpt rhpt;
5250 if (copy_from_user(&rhpt, argp, sizeof(rhpt)))
5253 r = kvm_vm_ioctl_resize_hpt_prepare(kvm, &rhpt);
5257 case KVM_PPC_RESIZE_HPT_COMMIT: {
5258 struct kvm_ppc_resize_hpt rhpt;
5261 if (copy_from_user(&rhpt, argp, sizeof(rhpt)))
5264 r = kvm_vm_ioctl_resize_hpt_commit(kvm, &rhpt);
5276 * List of hcall numbers to enable by default.
5277 * For compatibility with old userspace, we enable by default
5278 * all hcalls that were implemented before the hcall-enabling
5279 * facility was added. Note this list should not include H_RTAS.
5281 static unsigned int default_hcall_list[] = {
5295 #ifdef CONFIG_KVM_XICS
5306 static void init_default_hcalls(void)
5311 for (i = 0; default_hcall_list[i]; ++i) {
5312 hcall = default_hcall_list[i];
5313 WARN_ON(!kvmppc_hcall_impl_hv(hcall));
5314 __set_bit(hcall / 4, default_enabled_hcalls);
5318 static int kvmhv_configure_mmu(struct kvm *kvm, struct kvm_ppc_mmuv3_cfg *cfg)
5324 /* If not on a POWER9, reject it */
5325 if (!cpu_has_feature(CPU_FTR_ARCH_300))
5328 /* If any unknown flags set, reject it */
5329 if (cfg->flags & ~(KVM_PPC_MMUV3_RADIX | KVM_PPC_MMUV3_GTSE))
5332 /* GR (guest radix) bit in process_table field must match */
5333 radix = !!(cfg->flags & KVM_PPC_MMUV3_RADIX);
5334 if (!!(cfg->process_table & PATB_GR) != radix)
5337 /* Process table size field must be reasonable, i.e. <= 24 */
5338 if ((cfg->process_table & PRTS_MASK) > 24)
5341 /* We can change a guest to/from radix now, if the host is radix */
5342 if (radix && !radix_enabled())
5345 /* If we're a nested hypervisor, we currently only support radix */
5346 if (kvmhv_on_pseries() && !radix)
5349 mutex_lock(&kvm->arch.mmu_setup_lock);
5350 if (radix != kvm_is_radix(kvm)) {
5351 if (kvm->arch.mmu_ready) {
5352 kvm->arch.mmu_ready = 0;
5353 /* order mmu_ready vs. vcpus_running */
5355 if (atomic_read(&kvm->arch.vcpus_running)) {
5356 kvm->arch.mmu_ready = 1;
5362 err = kvmppc_switch_mmu_to_radix(kvm);
5364 err = kvmppc_switch_mmu_to_hpt(kvm);
5369 kvm->arch.process_table = cfg->process_table;
5370 kvmppc_setup_partition_table(kvm);
5372 lpcr = (cfg->flags & KVM_PPC_MMUV3_GTSE) ? LPCR_GTSE : 0;
5373 kvmppc_update_lpcr(kvm, lpcr, LPCR_GTSE);
5377 mutex_unlock(&kvm->arch.mmu_setup_lock);
5381 static int kvmhv_enable_nested(struct kvm *kvm)
5385 if (!cpu_has_feature(CPU_FTR_ARCH_300) || no_mixing_hpt_and_radix)
5388 /* kvm == NULL means the caller is testing if the capability exists */
5390 kvm->arch.nested_enable = true;
5394 static int kvmhv_load_from_eaddr(struct kvm_vcpu *vcpu, ulong *eaddr, void *ptr,
5399 if (kvmhv_vcpu_is_radix(vcpu)) {
5400 rc = kvmhv_copy_from_guest_radix(vcpu, *eaddr, ptr, size);
5406 /* For now quadrants are the only way to access nested guest memory */
5407 if (rc && vcpu->arch.nested)
5413 static int kvmhv_store_to_eaddr(struct kvm_vcpu *vcpu, ulong *eaddr, void *ptr,
5418 if (kvmhv_vcpu_is_radix(vcpu)) {
5419 rc = kvmhv_copy_to_guest_radix(vcpu, *eaddr, ptr, size);
5425 /* For now quadrants are the only way to access nested guest memory */
5426 if (rc && vcpu->arch.nested)
5432 static struct kvmppc_ops kvm_ops_hv = {
5433 .get_sregs = kvm_arch_vcpu_ioctl_get_sregs_hv,
5434 .set_sregs = kvm_arch_vcpu_ioctl_set_sregs_hv,
5435 .get_one_reg = kvmppc_get_one_reg_hv,
5436 .set_one_reg = kvmppc_set_one_reg_hv,
5437 .vcpu_load = kvmppc_core_vcpu_load_hv,
5438 .vcpu_put = kvmppc_core_vcpu_put_hv,
5439 .set_msr = kvmppc_set_msr_hv,
5440 .vcpu_run = kvmppc_vcpu_run_hv,
5441 .vcpu_create = kvmppc_core_vcpu_create_hv,
5442 .vcpu_free = kvmppc_core_vcpu_free_hv,
5443 .check_requests = kvmppc_core_check_requests_hv,
5444 .get_dirty_log = kvm_vm_ioctl_get_dirty_log_hv,
5445 .flush_memslot = kvmppc_core_flush_memslot_hv,
5446 .prepare_memory_region = kvmppc_core_prepare_memory_region_hv,
5447 .commit_memory_region = kvmppc_core_commit_memory_region_hv,
5448 .unmap_hva_range = kvm_unmap_hva_range_hv,
5449 .age_hva = kvm_age_hva_hv,
5450 .test_age_hva = kvm_test_age_hva_hv,
5451 .set_spte_hva = kvm_set_spte_hva_hv,
5452 .mmu_destroy = kvmppc_mmu_destroy_hv,
5453 .free_memslot = kvmppc_core_free_memslot_hv,
5454 .create_memslot = kvmppc_core_create_memslot_hv,
5455 .init_vm = kvmppc_core_init_vm_hv,
5456 .destroy_vm = kvmppc_core_destroy_vm_hv,
5457 .get_smmu_info = kvm_vm_ioctl_get_smmu_info_hv,
5458 .emulate_op = kvmppc_core_emulate_op_hv,
5459 .emulate_mtspr = kvmppc_core_emulate_mtspr_hv,
5460 .emulate_mfspr = kvmppc_core_emulate_mfspr_hv,
5461 .fast_vcpu_kick = kvmppc_fast_vcpu_kick_hv,
5462 .arch_vm_ioctl = kvm_arch_vm_ioctl_hv,
5463 .hcall_implemented = kvmppc_hcall_impl_hv,
5464 #ifdef CONFIG_KVM_XICS
5465 .irq_bypass_add_producer = kvmppc_irq_bypass_add_producer_hv,
5466 .irq_bypass_del_producer = kvmppc_irq_bypass_del_producer_hv,
5468 .configure_mmu = kvmhv_configure_mmu,
5469 .get_rmmu_info = kvmhv_get_rmmu_info,
5470 .set_smt_mode = kvmhv_set_smt_mode,
5471 .enable_nested = kvmhv_enable_nested,
5472 .load_from_eaddr = kvmhv_load_from_eaddr,
5473 .store_to_eaddr = kvmhv_store_to_eaddr,
5476 static int kvm_init_subcore_bitmap(void)
5479 int nr_cores = cpu_nr_cores();
5480 struct sibling_subcore_state *sibling_subcore_state;
5482 for (i = 0; i < nr_cores; i++) {
5483 int first_cpu = i * threads_per_core;
5484 int node = cpu_to_node(first_cpu);
5486 /* Ignore if it is already allocated. */
5487 if (paca_ptrs[first_cpu]->sibling_subcore_state)
5490 sibling_subcore_state =
5491 kzalloc_node(sizeof(struct sibling_subcore_state),
5493 if (!sibling_subcore_state)
5497 for (j = 0; j < threads_per_core; j++) {
5498 int cpu = first_cpu + j;
5500 paca_ptrs[cpu]->sibling_subcore_state =
5501 sibling_subcore_state;
5507 static int kvmppc_radix_possible(void)
5509 return cpu_has_feature(CPU_FTR_ARCH_300) && radix_enabled();
5512 static int kvmppc_book3s_init_hv(void)
5516 if (!tlbie_capable) {
5517 pr_err("KVM-HV: Host does not support TLBIE\n");
5522 * FIXME!! Do we need to check on all cpus ?
5524 r = kvmppc_core_check_processor_compat_hv();
5528 r = kvmhv_nested_init();
5532 r = kvm_init_subcore_bitmap();
5537 * We need a way of accessing the XICS interrupt controller,
5538 * either directly, via paca_ptrs[cpu]->kvm_hstate.xics_phys, or
5539 * indirectly, via OPAL.
5542 if (!xics_on_xive() && !kvmhv_on_pseries() &&
5543 !local_paca->kvm_hstate.xics_phys) {
5544 struct device_node *np;
5546 np = of_find_compatible_node(NULL, NULL, "ibm,opal-intc");
5548 pr_err("KVM-HV: Cannot determine method for accessing XICS\n");
5551 /* presence of intc confirmed - node can be dropped again */
5556 kvm_ops_hv.owner = THIS_MODULE;
5557 kvmppc_hv_ops = &kvm_ops_hv;
5559 init_default_hcalls();
5563 r = kvmppc_mmu_hv_init();
5567 if (kvmppc_radix_possible())
5568 r = kvmppc_radix_init();
5571 * POWER9 chips before version 2.02 can't have some threads in
5572 * HPT mode and some in radix mode on the same core.
5574 if (cpu_has_feature(CPU_FTR_ARCH_300)) {
5575 unsigned int pvr = mfspr(SPRN_PVR);
5576 if ((pvr >> 16) == PVR_POWER9 &&
5577 (((pvr & 0xe000) == 0 && (pvr & 0xfff) < 0x202) ||
5578 ((pvr & 0xe000) == 0x2000 && (pvr & 0xfff) < 0x101)))
5579 no_mixing_hpt_and_radix = true;
5585 static void kvmppc_book3s_exit_hv(void)
5587 kvmppc_free_host_rm_ops();
5588 if (kvmppc_radix_possible())
5589 kvmppc_radix_exit();
5590 kvmppc_hv_ops = NULL;
5591 kvmhv_nested_exit();
5594 module_init(kvmppc_book3s_init_hv);
5595 module_exit(kvmppc_book3s_exit_hv);
5596 MODULE_LICENSE("GPL");
5597 MODULE_ALIAS_MISCDEV(KVM_MINOR);
5598 MODULE_ALIAS("devname:kvm");