2 * This program is free software; you can redistribute it and/or modify
3 * it under the terms of the GNU General Public License, version 2, as
4 * published by the Free Software Foundation.
6 * This program is distributed in the hope that it will be useful,
7 * but WITHOUT ANY WARRANTY; without even the implied warranty of
8 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
9 * GNU General Public License for more details.
11 * You should have received a copy of the GNU General Public License
12 * along with this program; if not, write to the Free Software
13 * Foundation, 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
15 * Copyright 2010 Paul Mackerras, IBM Corp. <paulus@au1.ibm.com>
18 #include <linux/types.h>
19 #include <linux/string.h>
20 #include <linux/kvm.h>
21 #include <linux/kvm_host.h>
22 #include <linux/highmem.h>
23 #include <linux/gfp.h>
24 #include <linux/slab.h>
25 #include <linux/hugetlb.h>
26 #include <linux/vmalloc.h>
27 #include <linux/srcu.h>
28 #include <linux/anon_inodes.h>
29 #include <linux/file.h>
30 #include <linux/debugfs.h>
32 #include <asm/tlbflush.h>
33 #include <asm/kvm_ppc.h>
34 #include <asm/kvm_book3s.h>
35 #include <asm/book3s/64/mmu-hash.h>
36 #include <asm/hvcall.h>
37 #include <asm/synch.h>
38 #include <asm/ppc-opcode.h>
39 #include <asm/cputable.h>
40 #include <asm/pte-walk.h>
44 //#define DEBUG_RESIZE_HPT 1
46 #ifdef DEBUG_RESIZE_HPT
47 #define resize_hpt_debug(resize, ...) \
49 printk(KERN_DEBUG "RESIZE HPT %p: ", resize); \
50 printk(__VA_ARGS__); \
53 #define resize_hpt_debug(resize, ...) \
57 static long kvmppc_virtmode_do_h_enter(struct kvm *kvm, unsigned long flags,
58 long pte_index, unsigned long pteh,
59 unsigned long ptel, unsigned long *pte_idx_ret);
61 struct kvm_resize_hpt {
62 /* These fields read-only after init */
64 struct work_struct work;
67 /* These fields protected by kvm->lock */
69 /* Possible values and their usage:
70 * <0 an error occurred during allocation,
71 * -EBUSY allocation is in the progress,
72 * 0 allocation made successfuly.
76 /* Private to the work thread, until error != -EBUSY,
77 * then protected by kvm->lock.
79 struct kvm_hpt_info hpt;
82 static void kvmppc_rmap_reset(struct kvm *kvm);
84 int kvmppc_allocate_hpt(struct kvm_hpt_info *info, u32 order)
86 unsigned long hpt = 0;
88 struct page *page = NULL;
89 struct revmap_entry *rev;
92 if ((order < PPC_MIN_HPT_ORDER) || (order > PPC_MAX_HPT_ORDER))
95 page = kvm_alloc_hpt_cma(1ul << (order - PAGE_SHIFT));
97 hpt = (unsigned long)pfn_to_kaddr(page_to_pfn(page));
98 memset((void *)hpt, 0, (1ul << order));
103 hpt = __get_free_pages(GFP_KERNEL|__GFP_ZERO|__GFP_RETRY_MAYFAIL
104 |__GFP_NOWARN, order - PAGE_SHIFT);
109 /* HPTEs are 2**4 bytes long */
110 npte = 1ul << (order - 4);
112 /* Allocate reverse map array */
113 rev = vmalloc(sizeof(struct revmap_entry) * npte);
115 pr_err("kvmppc_allocate_hpt: Couldn't alloc reverse map array\n");
117 kvm_free_hpt_cma(page, 1 << (order - PAGE_SHIFT));
119 free_pages(hpt, order - PAGE_SHIFT);
131 void kvmppc_set_hpt(struct kvm *kvm, struct kvm_hpt_info *info)
133 atomic64_set(&kvm->arch.mmio_update, 0);
134 kvm->arch.hpt = *info;
135 kvm->arch.sdr1 = __pa(info->virt) | (info->order - 18);
137 pr_debug("KVM guest htab at %lx (order %ld), LPID %x\n",
138 info->virt, (long)info->order, kvm->arch.lpid);
141 long kvmppc_alloc_reset_hpt(struct kvm *kvm, int order)
144 struct kvm_hpt_info info;
146 if (kvm_is_radix(kvm))
149 mutex_lock(&kvm->lock);
150 if (kvm->arch.hpte_setup_done) {
151 kvm->arch.hpte_setup_done = 0;
152 /* order hpte_setup_done vs. vcpus_running */
154 if (atomic_read(&kvm->arch.vcpus_running)) {
155 kvm->arch.hpte_setup_done = 1;
159 if (kvm->arch.hpt.order == order) {
160 /* We already have a suitable HPT */
162 /* Set the entire HPT to 0, i.e. invalid HPTEs */
163 memset((void *)kvm->arch.hpt.virt, 0, 1ul << order);
165 * Reset all the reverse-mapping chains for all memslots
167 kvmppc_rmap_reset(kvm);
172 if (kvm->arch.hpt.virt) {
173 kvmppc_free_hpt(&kvm->arch.hpt);
174 kvmppc_rmap_reset(kvm);
177 err = kvmppc_allocate_hpt(&info, order);
180 kvmppc_set_hpt(kvm, &info);
184 /* Ensure that each vcpu will flush its TLB on next entry. */
185 cpumask_setall(&kvm->arch.need_tlb_flush);
187 mutex_unlock(&kvm->lock);
191 void kvmppc_free_hpt(struct kvm_hpt_info *info)
195 kvm_free_hpt_cma(virt_to_page(info->virt),
196 1 << (info->order - PAGE_SHIFT));
198 free_pages(info->virt, info->order - PAGE_SHIFT);
203 /* Bits in first HPTE dword for pagesize 4k, 64k or 16M */
204 static inline unsigned long hpte0_pgsize_encoding(unsigned long pgsize)
206 return (pgsize > 0x1000) ? HPTE_V_LARGE : 0;
209 /* Bits in second HPTE dword for pagesize 4k, 64k or 16M */
210 static inline unsigned long hpte1_pgsize_encoding(unsigned long pgsize)
212 return (pgsize == 0x10000) ? 0x1000 : 0;
215 void kvmppc_map_vrma(struct kvm_vcpu *vcpu, struct kvm_memory_slot *memslot,
216 unsigned long porder)
219 unsigned long npages;
220 unsigned long hp_v, hp_r;
221 unsigned long addr, hash;
223 unsigned long hp0, hp1;
224 unsigned long idx_ret;
226 struct kvm *kvm = vcpu->kvm;
228 psize = 1ul << porder;
229 npages = memslot->npages >> (porder - PAGE_SHIFT);
231 /* VRMA can't be > 1TB */
232 if (npages > 1ul << (40 - porder))
233 npages = 1ul << (40 - porder);
234 /* Can't use more than 1 HPTE per HPTEG */
235 if (npages > kvmppc_hpt_mask(&kvm->arch.hpt) + 1)
236 npages = kvmppc_hpt_mask(&kvm->arch.hpt) + 1;
238 hp0 = HPTE_V_1TB_SEG | (VRMA_VSID << (40 - 16)) |
239 HPTE_V_BOLTED | hpte0_pgsize_encoding(psize);
240 hp1 = hpte1_pgsize_encoding(psize) |
241 HPTE_R_R | HPTE_R_C | HPTE_R_M | PP_RWXX;
243 for (i = 0; i < npages; ++i) {
245 /* can't use hpt_hash since va > 64 bits */
246 hash = (i ^ (VRMA_VSID ^ (VRMA_VSID << 25)))
247 & kvmppc_hpt_mask(&kvm->arch.hpt);
249 * We assume that the hash table is empty and no
250 * vcpus are using it at this stage. Since we create
251 * at most one HPTE per HPTEG, we just assume entry 7
252 * is available and use it.
254 hash = (hash << 3) + 7;
255 hp_v = hp0 | ((addr >> 16) & ~0x7fUL);
257 ret = kvmppc_virtmode_do_h_enter(kvm, H_EXACT, hash, hp_v, hp_r,
259 if (ret != H_SUCCESS) {
260 pr_err("KVM: map_vrma at %lx failed, ret=%ld\n",
267 int kvmppc_mmu_hv_init(void)
269 unsigned long host_lpid, rsvd_lpid;
271 if (!cpu_has_feature(CPU_FTR_HVMODE))
274 /* POWER7 has 10-bit LPIDs (12-bit in POWER8) */
275 host_lpid = mfspr(SPRN_LPID);
276 rsvd_lpid = LPID_RSVD;
278 kvmppc_init_lpid(rsvd_lpid + 1);
280 kvmppc_claim_lpid(host_lpid);
281 /* rsvd_lpid is reserved for use in partition switching */
282 kvmppc_claim_lpid(rsvd_lpid);
287 static void kvmppc_mmu_book3s_64_hv_reset_msr(struct kvm_vcpu *vcpu)
289 unsigned long msr = vcpu->arch.intr_msr;
291 /* If transactional, change to suspend mode on IRQ delivery */
292 if (MSR_TM_TRANSACTIONAL(vcpu->arch.shregs.msr))
295 msr |= vcpu->arch.shregs.msr & MSR_TS_MASK;
296 kvmppc_set_msr(vcpu, msr);
299 static long kvmppc_virtmode_do_h_enter(struct kvm *kvm, unsigned long flags,
300 long pte_index, unsigned long pteh,
301 unsigned long ptel, unsigned long *pte_idx_ret)
305 /* Protect linux PTE lookup from page table destruction */
306 rcu_read_lock_sched(); /* this disables preemption too */
307 ret = kvmppc_do_h_enter(kvm, flags, pte_index, pteh, ptel,
308 current->mm->pgd, false, pte_idx_ret);
309 rcu_read_unlock_sched();
310 if (ret == H_TOO_HARD) {
311 /* this can't happen */
312 pr_err("KVM: Oops, kvmppc_h_enter returned too hard!\n");
313 ret = H_RESOURCE; /* or something */
319 static struct kvmppc_slb *kvmppc_mmu_book3s_hv_find_slbe(struct kvm_vcpu *vcpu,
325 for (i = 0; i < vcpu->arch.slb_nr; i++) {
326 if (!(vcpu->arch.slb[i].orige & SLB_ESID_V))
329 if (vcpu->arch.slb[i].origv & SLB_VSID_B_1T)
334 if (((vcpu->arch.slb[i].orige ^ eaddr) & mask) == 0)
335 return &vcpu->arch.slb[i];
340 static unsigned long kvmppc_mmu_get_real_addr(unsigned long v, unsigned long r,
343 unsigned long ra_mask;
345 ra_mask = hpte_page_size(v, r) - 1;
346 return (r & HPTE_R_RPN & ~ra_mask) | (ea & ra_mask);
349 static int kvmppc_mmu_book3s_64_hv_xlate(struct kvm_vcpu *vcpu, gva_t eaddr,
350 struct kvmppc_pte *gpte, bool data, bool iswrite)
352 struct kvm *kvm = vcpu->kvm;
353 struct kvmppc_slb *slbe;
355 unsigned long pp, key;
356 unsigned long v, orig_v, gr;
359 int virtmode = vcpu->arch.shregs.msr & (data ? MSR_DR : MSR_IR);
363 slbe = kvmppc_mmu_book3s_hv_find_slbe(vcpu, eaddr);
368 /* real mode access */
369 slb_v = vcpu->kvm->arch.vrma_slb_v;
373 /* Find the HPTE in the hash table */
374 index = kvmppc_hv_find_lock_hpte(kvm, eaddr, slb_v,
375 HPTE_V_VALID | HPTE_V_ABSENT);
380 hptep = (__be64 *)(kvm->arch.hpt.virt + (index << 4));
381 v = orig_v = be64_to_cpu(hptep[0]) & ~HPTE_V_HVLOCK;
382 if (cpu_has_feature(CPU_FTR_ARCH_300))
383 v = hpte_new_to_old_v(v, be64_to_cpu(hptep[1]));
384 gr = kvm->arch.hpt.rev[index].guest_rpte;
386 unlock_hpte(hptep, orig_v);
390 gpte->vpage = ((v & HPTE_V_AVPN) << 4) | ((eaddr >> 12) & 0xfff);
392 /* Get PP bits and key for permission check */
393 pp = gr & (HPTE_R_PP0 | HPTE_R_PP);
394 key = (vcpu->arch.shregs.msr & MSR_PR) ? SLB_VSID_KP : SLB_VSID_KS;
397 /* Calculate permissions */
398 gpte->may_read = hpte_read_permission(pp, key);
399 gpte->may_write = hpte_write_permission(pp, key);
400 gpte->may_execute = gpte->may_read && !(gr & (HPTE_R_N | HPTE_R_G));
402 /* Storage key permission check for POWER7 */
403 if (data && virtmode) {
404 int amrfield = hpte_get_skey_perm(gr, vcpu->arch.amr);
411 /* Get the guest physical address */
412 gpte->raddr = kvmppc_mmu_get_real_addr(v, gr, eaddr);
417 * Quick test for whether an instruction is a load or a store.
418 * If the instruction is a load or a store, then this will indicate
419 * which it is, at least on server processors. (Embedded processors
420 * have some external PID instructions that don't follow the rule
421 * embodied here.) If the instruction isn't a load or store, then
422 * this doesn't return anything useful.
424 static int instruction_is_store(unsigned int instr)
429 if ((instr & 0xfc000000) == 0x7c000000)
430 mask = 0x100; /* major opcode 31 */
431 return (instr & mask) != 0;
434 int kvmppc_hv_emulate_mmio(struct kvm_run *run, struct kvm_vcpu *vcpu,
435 unsigned long gpa, gva_t ea, int is_store)
440 * If we fail, we just return to the guest and try executing it again.
442 if (kvmppc_get_last_inst(vcpu, INST_GENERIC, &last_inst) !=
447 * WARNING: We do not know for sure whether the instruction we just
448 * read from memory is the same that caused the fault in the first
449 * place. If the instruction we read is neither an load or a store,
450 * then it can't access memory, so we don't need to worry about
451 * enforcing access permissions. So, assuming it is a load or
452 * store, we just check that its direction (load or store) is
453 * consistent with the original fault, since that's what we
454 * checked the access permissions against. If there is a mismatch
455 * we just return and retry the instruction.
458 if (instruction_is_store(last_inst) != !!is_store)
462 * Emulated accesses are emulated by looking at the hash for
463 * translation once, then performing the access later. The
464 * translation could be invalidated in the meantime in which
465 * point performing the subsequent memory access on the old
466 * physical address could possibly be a security hole for the
467 * guest (but not the host).
469 * This is less of an issue for MMIO stores since they aren't
470 * globally visible. It could be an issue for MMIO loads to
471 * a certain extent but we'll ignore it for now.
474 vcpu->arch.paddr_accessed = gpa;
475 vcpu->arch.vaddr_accessed = ea;
476 return kvmppc_emulate_mmio(run, vcpu);
479 int kvmppc_book3s_hv_page_fault(struct kvm_run *run, struct kvm_vcpu *vcpu,
480 unsigned long ea, unsigned long dsisr)
482 struct kvm *kvm = vcpu->kvm;
483 unsigned long hpte[3], r;
484 unsigned long hnow_v, hnow_r;
486 unsigned long mmu_seq, psize, pte_size;
487 unsigned long gpa_base, gfn_base;
488 unsigned long gpa, gfn, hva, pfn;
489 struct kvm_memory_slot *memslot;
491 struct revmap_entry *rev;
492 struct page *page, *pages[1];
493 long index, ret, npages;
495 unsigned int writing, write_ok;
496 struct vm_area_struct *vma;
497 unsigned long rcbits;
500 if (kvm_is_radix(kvm))
501 return kvmppc_book3s_radix_page_fault(run, vcpu, ea, dsisr);
504 * Real-mode code has already searched the HPT and found the
505 * entry we're interested in. Lock the entry and check that
506 * it hasn't changed. If it has, just return and re-execute the
509 if (ea != vcpu->arch.pgfault_addr)
512 if (vcpu->arch.pgfault_cache) {
513 mmio_update = atomic64_read(&kvm->arch.mmio_update);
514 if (mmio_update == vcpu->arch.pgfault_cache->mmio_update) {
515 r = vcpu->arch.pgfault_cache->rpte;
516 psize = hpte_page_size(vcpu->arch.pgfault_hpte[0], r);
517 gpa_base = r & HPTE_R_RPN & ~(psize - 1);
518 gfn_base = gpa_base >> PAGE_SHIFT;
519 gpa = gpa_base | (ea & (psize - 1));
520 return kvmppc_hv_emulate_mmio(run, vcpu, gpa, ea,
521 dsisr & DSISR_ISSTORE);
524 index = vcpu->arch.pgfault_index;
525 hptep = (__be64 *)(kvm->arch.hpt.virt + (index << 4));
526 rev = &kvm->arch.hpt.rev[index];
528 while (!try_lock_hpte(hptep, HPTE_V_HVLOCK))
530 hpte[0] = be64_to_cpu(hptep[0]) & ~HPTE_V_HVLOCK;
531 hpte[1] = be64_to_cpu(hptep[1]);
532 hpte[2] = r = rev->guest_rpte;
533 unlock_hpte(hptep, hpte[0]);
536 if (cpu_has_feature(CPU_FTR_ARCH_300)) {
537 hpte[0] = hpte_new_to_old_v(hpte[0], hpte[1]);
538 hpte[1] = hpte_new_to_old_r(hpte[1]);
540 if (hpte[0] != vcpu->arch.pgfault_hpte[0] ||
541 hpte[1] != vcpu->arch.pgfault_hpte[1])
544 /* Translate the logical address and get the page */
545 psize = hpte_page_size(hpte[0], r);
546 gpa_base = r & HPTE_R_RPN & ~(psize - 1);
547 gfn_base = gpa_base >> PAGE_SHIFT;
548 gpa = gpa_base | (ea & (psize - 1));
549 gfn = gpa >> PAGE_SHIFT;
550 memslot = gfn_to_memslot(kvm, gfn);
552 trace_kvm_page_fault_enter(vcpu, hpte, memslot, ea, dsisr);
554 /* No memslot means it's an emulated MMIO region */
555 if (!memslot || (memslot->flags & KVM_MEMSLOT_INVALID))
556 return kvmppc_hv_emulate_mmio(run, vcpu, gpa, ea,
557 dsisr & DSISR_ISSTORE);
560 * This should never happen, because of the slot_is_aligned()
561 * check in kvmppc_do_h_enter().
563 if (gfn_base < memslot->base_gfn)
566 /* used to check for invalidations in progress */
567 mmu_seq = kvm->mmu_notifier_seq;
574 pte_size = PAGE_SIZE;
575 writing = (dsisr & DSISR_ISSTORE) != 0;
576 /* If writing != 0, then the HPTE must allow writing, if we get here */
578 hva = gfn_to_hva_memslot(memslot, gfn);
579 npages = get_user_pages_fast(hva, 1, writing, pages);
581 /* Check if it's an I/O mapping */
582 down_read(¤t->mm->mmap_sem);
583 vma = find_vma(current->mm, hva);
584 if (vma && vma->vm_start <= hva && hva + psize <= vma->vm_end &&
585 (vma->vm_flags & VM_PFNMAP)) {
586 pfn = vma->vm_pgoff +
587 ((hva - vma->vm_start) >> PAGE_SHIFT);
589 is_ci = pte_ci(__pte((pgprot_val(vma->vm_page_prot))));
590 write_ok = vma->vm_flags & VM_WRITE;
592 up_read(¤t->mm->mmap_sem);
597 pfn = page_to_pfn(page);
598 if (PageHuge(page)) {
599 page = compound_head(page);
600 pte_size <<= compound_order(page);
602 /* if the guest wants write access, see if that is OK */
603 if (!writing && hpte_is_writable(r)) {
607 * We need to protect against page table destruction
608 * hugepage split and collapse.
610 local_irq_save(flags);
611 ptep = find_current_mm_pte(current->mm->pgd,
614 pte = kvmppc_read_update_linux_pte(ptep, 1);
615 if (__pte_write(pte))
618 local_irq_restore(flags);
622 if (psize > pte_size)
625 /* Check WIMG vs. the actual page we're accessing */
626 if (!hpte_cache_flags_ok(r, is_ci)) {
630 * Allow guest to map emulated device memory as
631 * uncacheable, but actually make it cacheable.
633 r = (r & ~(HPTE_R_W|HPTE_R_I|HPTE_R_G)) | HPTE_R_M;
637 * Set the HPTE to point to pfn.
638 * Since the pfn is at PAGE_SIZE granularity, make sure we
639 * don't mask out lower-order bits if psize < PAGE_SIZE.
641 if (psize < PAGE_SIZE)
643 r = (r & HPTE_R_KEY_HI) | (r & ~(HPTE_R_PP0 - psize)) |
644 ((pfn << PAGE_SHIFT) & ~(psize - 1));
645 if (hpte_is_writable(r) && !write_ok)
646 r = hpte_make_readonly(r);
649 while (!try_lock_hpte(hptep, HPTE_V_HVLOCK))
651 hnow_v = be64_to_cpu(hptep[0]);
652 hnow_r = be64_to_cpu(hptep[1]);
653 if (cpu_has_feature(CPU_FTR_ARCH_300)) {
654 hnow_v = hpte_new_to_old_v(hnow_v, hnow_r);
655 hnow_r = hpte_new_to_old_r(hnow_r);
659 * If the HPT is being resized, don't update the HPTE,
660 * instead let the guest retry after the resize operation is complete.
661 * The synchronization for hpte_setup_done test vs. set is provided
664 if (!kvm->arch.hpte_setup_done)
667 if ((hnow_v & ~HPTE_V_HVLOCK) != hpte[0] || hnow_r != hpte[1] ||
668 rev->guest_rpte != hpte[2])
669 /* HPTE has been changed under us; let the guest retry */
671 hpte[0] = (hpte[0] & ~HPTE_V_ABSENT) | HPTE_V_VALID;
673 /* Always put the HPTE in the rmap chain for the page base address */
674 rmap = &memslot->arch.rmap[gfn_base - memslot->base_gfn];
677 /* Check if we might have been invalidated; let the guest retry if so */
679 if (mmu_notifier_retry(vcpu->kvm, mmu_seq)) {
684 /* Only set R/C in real HPTE if set in both *rmap and guest_rpte */
685 rcbits = *rmap >> KVMPPC_RMAP_RC_SHIFT;
686 r &= rcbits | ~(HPTE_R_R | HPTE_R_C);
688 if (be64_to_cpu(hptep[0]) & HPTE_V_VALID) {
689 /* HPTE was previously valid, so we need to invalidate it */
691 hptep[0] |= cpu_to_be64(HPTE_V_ABSENT);
692 kvmppc_invalidate_hpte(kvm, hptep, index);
693 /* don't lose previous R and C bits */
694 r |= be64_to_cpu(hptep[1]) & (HPTE_R_R | HPTE_R_C);
696 kvmppc_add_revmap_chain(kvm, rev, rmap, index, 0);
699 if (cpu_has_feature(CPU_FTR_ARCH_300)) {
700 r = hpte_old_to_new_r(hpte[0], r);
701 hpte[0] = hpte_old_to_new_v(hpte[0]);
703 hptep[1] = cpu_to_be64(r);
705 __unlock_hpte(hptep, hpte[0]);
706 asm volatile("ptesync" : : : "memory");
708 if (page && hpte_is_writable(r))
712 trace_kvm_page_fault_exit(vcpu, hpte, ret);
716 * We drop pages[0] here, not page because page might
717 * have been set to the head page of a compound, but
718 * we have to drop the reference on the correct tail
719 * page to match the get inside gup()
726 __unlock_hpte(hptep, be64_to_cpu(hptep[0]));
731 static void kvmppc_rmap_reset(struct kvm *kvm)
733 struct kvm_memslots *slots;
734 struct kvm_memory_slot *memslot;
737 srcu_idx = srcu_read_lock(&kvm->srcu);
738 slots = kvm_memslots(kvm);
739 kvm_for_each_memslot(memslot, slots) {
741 * This assumes it is acceptable to lose reference and
742 * change bits across a reset.
744 memset(memslot->arch.rmap, 0,
745 memslot->npages * sizeof(*memslot->arch.rmap));
747 srcu_read_unlock(&kvm->srcu, srcu_idx);
750 typedef int (*hva_handler_fn)(struct kvm *kvm, struct kvm_memory_slot *memslot,
753 static int kvm_handle_hva_range(struct kvm *kvm,
756 hva_handler_fn handler)
760 struct kvm_memslots *slots;
761 struct kvm_memory_slot *memslot;
763 slots = kvm_memslots(kvm);
764 kvm_for_each_memslot(memslot, slots) {
765 unsigned long hva_start, hva_end;
768 hva_start = max(start, memslot->userspace_addr);
769 hva_end = min(end, memslot->userspace_addr +
770 (memslot->npages << PAGE_SHIFT));
771 if (hva_start >= hva_end)
774 * {gfn(page) | page intersects with [hva_start, hva_end)} =
775 * {gfn, gfn+1, ..., gfn_end-1}.
777 gfn = hva_to_gfn_memslot(hva_start, memslot);
778 gfn_end = hva_to_gfn_memslot(hva_end + PAGE_SIZE - 1, memslot);
780 for (; gfn < gfn_end; ++gfn) {
781 ret = handler(kvm, memslot, gfn);
789 static int kvm_handle_hva(struct kvm *kvm, unsigned long hva,
790 hva_handler_fn handler)
792 return kvm_handle_hva_range(kvm, hva, hva + 1, handler);
795 /* Must be called with both HPTE and rmap locked */
796 static void kvmppc_unmap_hpte(struct kvm *kvm, unsigned long i,
797 unsigned long *rmapp, unsigned long gfn)
799 __be64 *hptep = (__be64 *) (kvm->arch.hpt.virt + (i << 4));
800 struct revmap_entry *rev = kvm->arch.hpt.rev;
802 unsigned long ptel, psize, rcbits;
806 /* chain is now empty */
807 *rmapp &= ~(KVMPPC_RMAP_PRESENT | KVMPPC_RMAP_INDEX);
809 /* remove i from chain */
813 rev[i].forw = rev[i].back = i;
814 *rmapp = (*rmapp & ~KVMPPC_RMAP_INDEX) | j;
817 /* Now check and modify the HPTE */
818 ptel = rev[i].guest_rpte;
819 psize = hpte_page_size(be64_to_cpu(hptep[0]), ptel);
820 if ((be64_to_cpu(hptep[0]) & HPTE_V_VALID) &&
821 hpte_rpn(ptel, psize) == gfn) {
822 hptep[0] |= cpu_to_be64(HPTE_V_ABSENT);
823 kvmppc_invalidate_hpte(kvm, hptep, i);
824 hptep[1] &= ~cpu_to_be64(HPTE_R_KEY_HI | HPTE_R_KEY_LO);
825 /* Harvest R and C */
826 rcbits = be64_to_cpu(hptep[1]) & (HPTE_R_R | HPTE_R_C);
827 *rmapp |= rcbits << KVMPPC_RMAP_RC_SHIFT;
828 if (rcbits & HPTE_R_C)
829 kvmppc_update_rmap_change(rmapp, psize);
830 if (rcbits & ~rev[i].guest_rpte) {
831 rev[i].guest_rpte = ptel | rcbits;
832 note_hpte_modification(kvm, &rev[i]);
837 static int kvm_unmap_rmapp(struct kvm *kvm, struct kvm_memory_slot *memslot,
842 unsigned long *rmapp;
844 rmapp = &memslot->arch.rmap[gfn - memslot->base_gfn];
847 if (!(*rmapp & KVMPPC_RMAP_PRESENT)) {
853 * To avoid an ABBA deadlock with the HPTE lock bit,
854 * we can't spin on the HPTE lock while holding the
857 i = *rmapp & KVMPPC_RMAP_INDEX;
858 hptep = (__be64 *) (kvm->arch.hpt.virt + (i << 4));
859 if (!try_lock_hpte(hptep, HPTE_V_HVLOCK)) {
860 /* unlock rmap before spinning on the HPTE lock */
862 while (be64_to_cpu(hptep[0]) & HPTE_V_HVLOCK)
867 kvmppc_unmap_hpte(kvm, i, rmapp, gfn);
869 __unlock_hpte(hptep, be64_to_cpu(hptep[0]));
874 int kvm_unmap_hva_hv(struct kvm *kvm, unsigned long hva)
876 hva_handler_fn handler;
878 handler = kvm_is_radix(kvm) ? kvm_unmap_radix : kvm_unmap_rmapp;
879 kvm_handle_hva(kvm, hva, handler);
883 int kvm_unmap_hva_range_hv(struct kvm *kvm, unsigned long start, unsigned long end)
885 hva_handler_fn handler;
887 handler = kvm_is_radix(kvm) ? kvm_unmap_radix : kvm_unmap_rmapp;
888 kvm_handle_hva_range(kvm, start, end, handler);
892 void kvmppc_core_flush_memslot_hv(struct kvm *kvm,
893 struct kvm_memory_slot *memslot)
897 unsigned long *rmapp;
899 gfn = memslot->base_gfn;
900 rmapp = memslot->arch.rmap;
901 for (n = memslot->npages; n; --n, ++gfn) {
902 if (kvm_is_radix(kvm)) {
903 kvm_unmap_radix(kvm, memslot, gfn);
907 * Testing the present bit without locking is OK because
908 * the memslot has been marked invalid already, and hence
909 * no new HPTEs referencing this page can be created,
910 * thus the present bit can't go from 0 to 1.
912 if (*rmapp & KVMPPC_RMAP_PRESENT)
913 kvm_unmap_rmapp(kvm, memslot, gfn);
918 static int kvm_age_rmapp(struct kvm *kvm, struct kvm_memory_slot *memslot,
921 struct revmap_entry *rev = kvm->arch.hpt.rev;
922 unsigned long head, i, j;
925 unsigned long *rmapp;
927 rmapp = &memslot->arch.rmap[gfn - memslot->base_gfn];
930 if (*rmapp & KVMPPC_RMAP_REFERENCED) {
931 *rmapp &= ~KVMPPC_RMAP_REFERENCED;
934 if (!(*rmapp & KVMPPC_RMAP_PRESENT)) {
939 i = head = *rmapp & KVMPPC_RMAP_INDEX;
941 hptep = (__be64 *) (kvm->arch.hpt.virt + (i << 4));
944 /* If this HPTE isn't referenced, ignore it */
945 if (!(be64_to_cpu(hptep[1]) & HPTE_R_R))
948 if (!try_lock_hpte(hptep, HPTE_V_HVLOCK)) {
949 /* unlock rmap before spinning on the HPTE lock */
951 while (be64_to_cpu(hptep[0]) & HPTE_V_HVLOCK)
956 /* Now check and modify the HPTE */
957 if ((be64_to_cpu(hptep[0]) & HPTE_V_VALID) &&
958 (be64_to_cpu(hptep[1]) & HPTE_R_R)) {
959 kvmppc_clear_ref_hpte(kvm, hptep, i);
960 if (!(rev[i].guest_rpte & HPTE_R_R)) {
961 rev[i].guest_rpte |= HPTE_R_R;
962 note_hpte_modification(kvm, &rev[i]);
966 __unlock_hpte(hptep, be64_to_cpu(hptep[0]));
967 } while ((i = j) != head);
973 int kvm_age_hva_hv(struct kvm *kvm, unsigned long start, unsigned long end)
975 hva_handler_fn handler;
977 handler = kvm_is_radix(kvm) ? kvm_age_radix : kvm_age_rmapp;
978 return kvm_handle_hva_range(kvm, start, end, handler);
981 static int kvm_test_age_rmapp(struct kvm *kvm, struct kvm_memory_slot *memslot,
984 struct revmap_entry *rev = kvm->arch.hpt.rev;
985 unsigned long head, i, j;
988 unsigned long *rmapp;
990 rmapp = &memslot->arch.rmap[gfn - memslot->base_gfn];
991 if (*rmapp & KVMPPC_RMAP_REFERENCED)
995 if (*rmapp & KVMPPC_RMAP_REFERENCED)
998 if (*rmapp & KVMPPC_RMAP_PRESENT) {
999 i = head = *rmapp & KVMPPC_RMAP_INDEX;
1001 hp = (unsigned long *)(kvm->arch.hpt.virt + (i << 4));
1003 if (be64_to_cpu(hp[1]) & HPTE_R_R)
1005 } while ((i = j) != head);
1014 int kvm_test_age_hva_hv(struct kvm *kvm, unsigned long hva)
1016 hva_handler_fn handler;
1018 handler = kvm_is_radix(kvm) ? kvm_test_age_radix : kvm_test_age_rmapp;
1019 return kvm_handle_hva(kvm, hva, handler);
1022 void kvm_set_spte_hva_hv(struct kvm *kvm, unsigned long hva, pte_t pte)
1024 hva_handler_fn handler;
1026 handler = kvm_is_radix(kvm) ? kvm_unmap_radix : kvm_unmap_rmapp;
1027 kvm_handle_hva(kvm, hva, handler);
1030 static int vcpus_running(struct kvm *kvm)
1032 return atomic_read(&kvm->arch.vcpus_running) != 0;
1036 * Returns the number of system pages that are dirty.
1037 * This can be more than 1 if we find a huge-page HPTE.
1039 static int kvm_test_clear_dirty_npages(struct kvm *kvm, unsigned long *rmapp)
1041 struct revmap_entry *rev = kvm->arch.hpt.rev;
1042 unsigned long head, i, j;
1046 int npages_dirty = 0;
1050 if (*rmapp & KVMPPC_RMAP_CHANGED) {
1051 long change_order = (*rmapp & KVMPPC_RMAP_CHG_ORDER)
1052 >> KVMPPC_RMAP_CHG_SHIFT;
1053 *rmapp &= ~(KVMPPC_RMAP_CHANGED | KVMPPC_RMAP_CHG_ORDER);
1055 if (change_order > PAGE_SHIFT)
1056 npages_dirty = 1ul << (change_order - PAGE_SHIFT);
1058 if (!(*rmapp & KVMPPC_RMAP_PRESENT)) {
1060 return npages_dirty;
1063 i = head = *rmapp & KVMPPC_RMAP_INDEX;
1065 unsigned long hptep1;
1066 hptep = (__be64 *) (kvm->arch.hpt.virt + (i << 4));
1070 * Checking the C (changed) bit here is racy since there
1071 * is no guarantee about when the hardware writes it back.
1072 * If the HPTE is not writable then it is stable since the
1073 * page can't be written to, and we would have done a tlbie
1074 * (which forces the hardware to complete any writeback)
1075 * when making the HPTE read-only.
1076 * If vcpus are running then this call is racy anyway
1077 * since the page could get dirtied subsequently, so we
1078 * expect there to be a further call which would pick up
1079 * any delayed C bit writeback.
1080 * Otherwise we need to do the tlbie even if C==0 in
1081 * order to pick up any delayed writeback of C.
1083 hptep1 = be64_to_cpu(hptep[1]);
1084 if (!(hptep1 & HPTE_R_C) &&
1085 (!hpte_is_writable(hptep1) || vcpus_running(kvm)))
1088 if (!try_lock_hpte(hptep, HPTE_V_HVLOCK)) {
1089 /* unlock rmap before spinning on the HPTE lock */
1091 while (hptep[0] & cpu_to_be64(HPTE_V_HVLOCK))
1096 /* Now check and modify the HPTE */
1097 if (!(hptep[0] & cpu_to_be64(HPTE_V_VALID))) {
1098 __unlock_hpte(hptep, be64_to_cpu(hptep[0]));
1102 /* need to make it temporarily absent so C is stable */
1103 hptep[0] |= cpu_to_be64(HPTE_V_ABSENT);
1104 kvmppc_invalidate_hpte(kvm, hptep, i);
1105 v = be64_to_cpu(hptep[0]);
1106 r = be64_to_cpu(hptep[1]);
1108 hptep[1] = cpu_to_be64(r & ~HPTE_R_C);
1109 if (!(rev[i].guest_rpte & HPTE_R_C)) {
1110 rev[i].guest_rpte |= HPTE_R_C;
1111 note_hpte_modification(kvm, &rev[i]);
1113 n = hpte_page_size(v, r);
1114 n = (n + PAGE_SIZE - 1) >> PAGE_SHIFT;
1115 if (n > npages_dirty)
1119 v &= ~HPTE_V_ABSENT;
1121 __unlock_hpte(hptep, v);
1122 } while ((i = j) != head);
1125 return npages_dirty;
1128 void kvmppc_harvest_vpa_dirty(struct kvmppc_vpa *vpa,
1129 struct kvm_memory_slot *memslot,
1134 if (!vpa->dirty || !vpa->pinned_addr)
1136 gfn = vpa->gpa >> PAGE_SHIFT;
1137 if (gfn < memslot->base_gfn ||
1138 gfn >= memslot->base_gfn + memslot->npages)
1143 __set_bit_le(gfn - memslot->base_gfn, map);
1146 long kvmppc_hv_get_dirty_log_hpt(struct kvm *kvm,
1147 struct kvm_memory_slot *memslot, unsigned long *map)
1150 unsigned long *rmapp;
1153 rmapp = memslot->arch.rmap;
1154 for (i = 0; i < memslot->npages; ++i) {
1155 int npages = kvm_test_clear_dirty_npages(kvm, rmapp);
1157 * Note that if npages > 0 then i must be a multiple of npages,
1158 * since we always put huge-page HPTEs in the rmap chain
1159 * corresponding to their page base address.
1162 for (j = i; npages; ++j, --npages)
1163 __set_bit_le(j, map);
1170 void *kvmppc_pin_guest_page(struct kvm *kvm, unsigned long gpa,
1171 unsigned long *nb_ret)
1173 struct kvm_memory_slot *memslot;
1174 unsigned long gfn = gpa >> PAGE_SHIFT;
1175 struct page *page, *pages[1];
1177 unsigned long hva, offset;
1180 srcu_idx = srcu_read_lock(&kvm->srcu);
1181 memslot = gfn_to_memslot(kvm, gfn);
1182 if (!memslot || (memslot->flags & KVM_MEMSLOT_INVALID))
1184 hva = gfn_to_hva_memslot(memslot, gfn);
1185 npages = get_user_pages_fast(hva, 1, 1, pages);
1189 srcu_read_unlock(&kvm->srcu, srcu_idx);
1191 offset = gpa & (PAGE_SIZE - 1);
1193 *nb_ret = PAGE_SIZE - offset;
1194 return page_address(page) + offset;
1197 srcu_read_unlock(&kvm->srcu, srcu_idx);
1201 void kvmppc_unpin_guest_page(struct kvm *kvm, void *va, unsigned long gpa,
1204 struct page *page = virt_to_page(va);
1205 struct kvm_memory_slot *memslot;
1207 unsigned long *rmap;
1215 /* We need to mark this page dirty in the rmap chain */
1216 gfn = gpa >> PAGE_SHIFT;
1217 srcu_idx = srcu_read_lock(&kvm->srcu);
1218 memslot = gfn_to_memslot(kvm, gfn);
1220 if (!kvm_is_radix(kvm)) {
1221 rmap = &memslot->arch.rmap[gfn - memslot->base_gfn];
1223 *rmap |= KVMPPC_RMAP_CHANGED;
1225 } else if (memslot->dirty_bitmap) {
1226 mark_page_dirty(kvm, gfn);
1229 srcu_read_unlock(&kvm->srcu, srcu_idx);
1235 static int resize_hpt_allocate(struct kvm_resize_hpt *resize)
1239 rc = kvmppc_allocate_hpt(&resize->hpt, resize->order);
1243 resize_hpt_debug(resize, "resize_hpt_allocate(): HPT @ 0x%lx\n",
1249 static unsigned long resize_hpt_rehash_hpte(struct kvm_resize_hpt *resize,
1252 struct kvm *kvm = resize->kvm;
1253 struct kvm_hpt_info *old = &kvm->arch.hpt;
1254 struct kvm_hpt_info *new = &resize->hpt;
1255 unsigned long old_hash_mask = (1ULL << (old->order - 7)) - 1;
1256 unsigned long new_hash_mask = (1ULL << (new->order - 7)) - 1;
1257 __be64 *hptep, *new_hptep;
1258 unsigned long vpte, rpte, guest_rpte;
1260 struct revmap_entry *rev;
1261 unsigned long apsize, psize, avpn, pteg, hash;
1262 unsigned long new_idx, new_pteg, replace_vpte;
1264 hptep = (__be64 *)(old->virt + (idx << 4));
1266 /* Guest is stopped, so new HPTEs can't be added or faulted
1267 * in, only unmapped or altered by host actions. So, it's
1268 * safe to check this before we take the HPTE lock */
1269 vpte = be64_to_cpu(hptep[0]);
1270 if (!(vpte & HPTE_V_VALID) && !(vpte & HPTE_V_ABSENT))
1271 return 0; /* nothing to do */
1273 while (!try_lock_hpte(hptep, HPTE_V_HVLOCK))
1276 vpte = be64_to_cpu(hptep[0]);
1279 if (!(vpte & HPTE_V_VALID) && !(vpte & HPTE_V_ABSENT))
1284 rev = &old->rev[idx];
1285 guest_rpte = rev->guest_rpte;
1288 apsize = hpte_page_size(vpte, guest_rpte);
1292 if (vpte & HPTE_V_VALID) {
1293 unsigned long gfn = hpte_rpn(guest_rpte, apsize);
1294 int srcu_idx = srcu_read_lock(&kvm->srcu);
1295 struct kvm_memory_slot *memslot =
1296 __gfn_to_memslot(kvm_memslots(kvm), gfn);
1299 unsigned long *rmapp;
1300 rmapp = &memslot->arch.rmap[gfn - memslot->base_gfn];
1303 kvmppc_unmap_hpte(kvm, idx, rmapp, gfn);
1307 srcu_read_unlock(&kvm->srcu, srcu_idx);
1310 /* Reload PTE after unmap */
1311 vpte = be64_to_cpu(hptep[0]);
1313 BUG_ON(vpte & HPTE_V_VALID);
1314 BUG_ON(!(vpte & HPTE_V_ABSENT));
1317 if (!(vpte & HPTE_V_BOLTED))
1320 rpte = be64_to_cpu(hptep[1]);
1321 psize = hpte_base_page_size(vpte, rpte);
1322 avpn = HPTE_V_AVPN_VAL(vpte) & ~((psize - 1) >> 23);
1323 pteg = idx / HPTES_PER_GROUP;
1324 if (vpte & HPTE_V_SECONDARY)
1327 if (!(vpte & HPTE_V_1TB_SEG)) {
1328 unsigned long offset, vsid;
1330 /* We only have 28 - 23 bits of offset in avpn */
1331 offset = (avpn & 0x1f) << 23;
1333 /* We can find more bits from the pteg value */
1334 if (psize < (1ULL << 23))
1335 offset |= ((vsid ^ pteg) & old_hash_mask) * psize;
1337 hash = vsid ^ (offset / psize);
1339 unsigned long offset, vsid;
1341 /* We only have 40 - 23 bits of seg_off in avpn */
1342 offset = (avpn & 0x1ffff) << 23;
1344 if (psize < (1ULL << 23))
1345 offset |= ((vsid ^ (vsid << 25) ^ pteg) & old_hash_mask) * psize;
1347 hash = vsid ^ (vsid << 25) ^ (offset / psize);
1350 new_pteg = hash & new_hash_mask;
1351 if (vpte & HPTE_V_SECONDARY)
1352 new_pteg = ~hash & new_hash_mask;
1354 new_idx = new_pteg * HPTES_PER_GROUP + (idx % HPTES_PER_GROUP);
1355 new_hptep = (__be64 *)(new->virt + (new_idx << 4));
1357 replace_vpte = be64_to_cpu(new_hptep[0]);
1359 if (replace_vpte & (HPTE_V_VALID | HPTE_V_ABSENT)) {
1360 BUG_ON(new->order >= old->order);
1362 if (replace_vpte & HPTE_V_BOLTED) {
1363 if (vpte & HPTE_V_BOLTED)
1364 /* Bolted collision, nothing we can do */
1366 /* Discard the new HPTE */
1370 /* Discard the previous HPTE */
1373 new_hptep[1] = cpu_to_be64(rpte);
1374 new->rev[new_idx].guest_rpte = guest_rpte;
1375 /* No need for a barrier, since new HPT isn't active */
1376 new_hptep[0] = cpu_to_be64(vpte);
1377 unlock_hpte(new_hptep, vpte);
1380 unlock_hpte(hptep, vpte);
1384 static int resize_hpt_rehash(struct kvm_resize_hpt *resize)
1386 struct kvm *kvm = resize->kvm;
1391 * resize_hpt_rehash_hpte() doesn't handle the new-format HPTEs
1392 * that POWER9 uses, and could well hit a BUG_ON on POWER9.
1394 if (cpu_has_feature(CPU_FTR_ARCH_300))
1396 for (i = 0; i < kvmppc_hpt_npte(&kvm->arch.hpt); i++) {
1397 rc = resize_hpt_rehash_hpte(resize, i);
1405 static void resize_hpt_pivot(struct kvm_resize_hpt *resize)
1407 struct kvm *kvm = resize->kvm;
1408 struct kvm_hpt_info hpt_tmp;
1410 /* Exchange the pending tables in the resize structure with
1411 * the active tables */
1413 resize_hpt_debug(resize, "resize_hpt_pivot()\n");
1415 spin_lock(&kvm->mmu_lock);
1416 asm volatile("ptesync" : : : "memory");
1418 hpt_tmp = kvm->arch.hpt;
1419 kvmppc_set_hpt(kvm, &resize->hpt);
1420 resize->hpt = hpt_tmp;
1422 spin_unlock(&kvm->mmu_lock);
1424 synchronize_srcu_expedited(&kvm->srcu);
1426 resize_hpt_debug(resize, "resize_hpt_pivot() done\n");
1429 static void resize_hpt_release(struct kvm *kvm, struct kvm_resize_hpt *resize)
1431 if (WARN_ON(!mutex_is_locked(&kvm->lock)))
1437 if (resize->error != -EBUSY) {
1438 if (resize->hpt.virt)
1439 kvmppc_free_hpt(&resize->hpt);
1443 if (kvm->arch.resize_hpt == resize)
1444 kvm->arch.resize_hpt = NULL;
1447 static void resize_hpt_prepare_work(struct work_struct *work)
1449 struct kvm_resize_hpt *resize = container_of(work,
1450 struct kvm_resize_hpt,
1452 struct kvm *kvm = resize->kvm;
1455 if (WARN_ON(resize->error != -EBUSY))
1458 mutex_lock(&kvm->lock);
1460 /* Request is still current? */
1461 if (kvm->arch.resize_hpt == resize) {
1462 /* We may request large allocations here:
1463 * do not sleep with kvm->lock held for a while.
1465 mutex_unlock(&kvm->lock);
1467 resize_hpt_debug(resize, "resize_hpt_prepare_work(): order = %d\n",
1470 err = resize_hpt_allocate(resize);
1472 /* We have strict assumption about -EBUSY
1473 * when preparing for HPT resize.
1475 if (WARN_ON(err == -EBUSY))
1478 mutex_lock(&kvm->lock);
1479 /* It is possible that kvm->arch.resize_hpt != resize
1480 * after we grab kvm->lock again.
1484 resize->error = err;
1486 if (kvm->arch.resize_hpt != resize)
1487 resize_hpt_release(kvm, resize);
1489 mutex_unlock(&kvm->lock);
1492 long kvm_vm_ioctl_resize_hpt_prepare(struct kvm *kvm,
1493 struct kvm_ppc_resize_hpt *rhpt)
1495 unsigned long flags = rhpt->flags;
1496 unsigned long shift = rhpt->shift;
1497 struct kvm_resize_hpt *resize;
1503 if (shift && ((shift < 18) || (shift > 46)))
1506 mutex_lock(&kvm->lock);
1508 resize = kvm->arch.resize_hpt;
1511 if (resize->order == shift) {
1512 /* Suitable resize in progress? */
1513 ret = resize->error;
1515 ret = 100; /* estimated time in ms */
1517 resize_hpt_release(kvm, resize);
1522 /* not suitable, cancel it */
1523 resize_hpt_release(kvm, resize);
1528 goto out; /* nothing to do */
1530 /* start new resize */
1532 resize = kzalloc(sizeof(*resize), GFP_KERNEL);
1538 resize->error = -EBUSY;
1539 resize->order = shift;
1541 INIT_WORK(&resize->work, resize_hpt_prepare_work);
1542 kvm->arch.resize_hpt = resize;
1544 schedule_work(&resize->work);
1546 ret = 100; /* estimated time in ms */
1549 mutex_unlock(&kvm->lock);
1553 static void resize_hpt_boot_vcpu(void *opaque)
1555 /* Nothing to do, just force a KVM exit */
1558 long kvm_vm_ioctl_resize_hpt_commit(struct kvm *kvm,
1559 struct kvm_ppc_resize_hpt *rhpt)
1561 unsigned long flags = rhpt->flags;
1562 unsigned long shift = rhpt->shift;
1563 struct kvm_resize_hpt *resize;
1569 if (shift && ((shift < 18) || (shift > 46)))
1572 mutex_lock(&kvm->lock);
1574 resize = kvm->arch.resize_hpt;
1576 /* This shouldn't be possible */
1578 if (WARN_ON(!kvm->arch.hpte_setup_done))
1581 /* Stop VCPUs from running while we mess with the HPT */
1582 kvm->arch.hpte_setup_done = 0;
1585 /* Boot all CPUs out of the guest so they re-read
1586 * hpte_setup_done */
1587 on_each_cpu(resize_hpt_boot_vcpu, NULL, 1);
1590 if (!resize || (resize->order != shift))
1593 ret = resize->error;
1597 ret = resize_hpt_rehash(resize);
1601 resize_hpt_pivot(resize);
1604 /* Let VCPUs run again */
1605 kvm->arch.hpte_setup_done = 1;
1608 resize_hpt_release(kvm, resize);
1609 mutex_unlock(&kvm->lock);
1614 * Functions for reading and writing the hash table via reads and
1615 * writes on a file descriptor.
1617 * Reads return the guest view of the hash table, which has to be
1618 * pieced together from the real hash table and the guest_rpte
1619 * values in the revmap array.
1621 * On writes, each HPTE written is considered in turn, and if it
1622 * is valid, it is written to the HPT as if an H_ENTER with the
1623 * exact flag set was done. When the invalid count is non-zero
1624 * in the header written to the stream, the kernel will make
1625 * sure that that many HPTEs are invalid, and invalidate them
1629 struct kvm_htab_ctx {
1630 unsigned long index;
1631 unsigned long flags;
1636 #define HPTE_SIZE (2 * sizeof(unsigned long))
1639 * Returns 1 if this HPT entry has been modified or has pending
1642 static int hpte_dirty(struct revmap_entry *revp, __be64 *hptp)
1644 unsigned long rcbits_unset;
1646 if (revp->guest_rpte & HPTE_GR_MODIFIED)
1649 /* Also need to consider changes in reference and changed bits */
1650 rcbits_unset = ~revp->guest_rpte & (HPTE_R_R | HPTE_R_C);
1651 if ((be64_to_cpu(hptp[0]) & HPTE_V_VALID) &&
1652 (be64_to_cpu(hptp[1]) & rcbits_unset))
1658 static long record_hpte(unsigned long flags, __be64 *hptp,
1659 unsigned long *hpte, struct revmap_entry *revp,
1660 int want_valid, int first_pass)
1662 unsigned long v, r, hr;
1663 unsigned long rcbits_unset;
1667 /* Unmodified entries are uninteresting except on the first pass */
1668 dirty = hpte_dirty(revp, hptp);
1669 if (!first_pass && !dirty)
1673 if (be64_to_cpu(hptp[0]) & (HPTE_V_VALID | HPTE_V_ABSENT)) {
1675 if ((flags & KVM_GET_HTAB_BOLTED_ONLY) &&
1676 !(be64_to_cpu(hptp[0]) & HPTE_V_BOLTED))
1679 if (valid != want_valid)
1683 if (valid || dirty) {
1684 /* lock the HPTE so it's stable and read it */
1686 while (!try_lock_hpte(hptp, HPTE_V_HVLOCK))
1688 v = be64_to_cpu(hptp[0]);
1689 hr = be64_to_cpu(hptp[1]);
1690 if (cpu_has_feature(CPU_FTR_ARCH_300)) {
1691 v = hpte_new_to_old_v(v, hr);
1692 hr = hpte_new_to_old_r(hr);
1695 /* re-evaluate valid and dirty from synchronized HPTE value */
1696 valid = !!(v & HPTE_V_VALID);
1697 dirty = !!(revp->guest_rpte & HPTE_GR_MODIFIED);
1699 /* Harvest R and C into guest view if necessary */
1700 rcbits_unset = ~revp->guest_rpte & (HPTE_R_R | HPTE_R_C);
1701 if (valid && (rcbits_unset & hr)) {
1702 revp->guest_rpte |= (hr &
1703 (HPTE_R_R | HPTE_R_C)) | HPTE_GR_MODIFIED;
1707 if (v & HPTE_V_ABSENT) {
1708 v &= ~HPTE_V_ABSENT;
1712 if ((flags & KVM_GET_HTAB_BOLTED_ONLY) && !(v & HPTE_V_BOLTED))
1715 r = revp->guest_rpte;
1716 /* only clear modified if this is the right sort of entry */
1717 if (valid == want_valid && dirty) {
1718 r &= ~HPTE_GR_MODIFIED;
1719 revp->guest_rpte = r;
1721 unlock_hpte(hptp, be64_to_cpu(hptp[0]));
1723 if (!(valid == want_valid && (first_pass || dirty)))
1726 hpte[0] = cpu_to_be64(v);
1727 hpte[1] = cpu_to_be64(r);
1731 static ssize_t kvm_htab_read(struct file *file, char __user *buf,
1732 size_t count, loff_t *ppos)
1734 struct kvm_htab_ctx *ctx = file->private_data;
1735 struct kvm *kvm = ctx->kvm;
1736 struct kvm_get_htab_header hdr;
1738 struct revmap_entry *revp;
1739 unsigned long i, nb, nw;
1740 unsigned long __user *lbuf;
1741 struct kvm_get_htab_header __user *hptr;
1742 unsigned long flags;
1744 unsigned long hpte[2];
1746 if (!access_ok(VERIFY_WRITE, buf, count))
1749 first_pass = ctx->first_pass;
1753 hptp = (__be64 *)(kvm->arch.hpt.virt + (i * HPTE_SIZE));
1754 revp = kvm->arch.hpt.rev + i;
1755 lbuf = (unsigned long __user *)buf;
1758 while (nb + sizeof(hdr) + HPTE_SIZE < count) {
1759 /* Initialize header */
1760 hptr = (struct kvm_get_htab_header __user *)buf;
1765 lbuf = (unsigned long __user *)(buf + sizeof(hdr));
1767 /* Skip uninteresting entries, i.e. clean on not-first pass */
1769 while (i < kvmppc_hpt_npte(&kvm->arch.hpt) &&
1770 !hpte_dirty(revp, hptp)) {
1778 /* Grab a series of valid entries */
1779 while (i < kvmppc_hpt_npte(&kvm->arch.hpt) &&
1780 hdr.n_valid < 0xffff &&
1781 nb + HPTE_SIZE < count &&
1782 record_hpte(flags, hptp, hpte, revp, 1, first_pass)) {
1783 /* valid entry, write it out */
1785 if (__put_user(hpte[0], lbuf) ||
1786 __put_user(hpte[1], lbuf + 1))
1794 /* Now skip invalid entries while we can */
1795 while (i < kvmppc_hpt_npte(&kvm->arch.hpt) &&
1796 hdr.n_invalid < 0xffff &&
1797 record_hpte(flags, hptp, hpte, revp, 0, first_pass)) {
1798 /* found an invalid entry */
1805 if (hdr.n_valid || hdr.n_invalid) {
1806 /* write back the header */
1807 if (__copy_to_user(hptr, &hdr, sizeof(hdr)))
1810 buf = (char __user *)lbuf;
1815 /* Check if we've wrapped around the hash table */
1816 if (i >= kvmppc_hpt_npte(&kvm->arch.hpt)) {
1818 ctx->first_pass = 0;
1828 static ssize_t kvm_htab_write(struct file *file, const char __user *buf,
1829 size_t count, loff_t *ppos)
1831 struct kvm_htab_ctx *ctx = file->private_data;
1832 struct kvm *kvm = ctx->kvm;
1833 struct kvm_get_htab_header hdr;
1836 unsigned long __user *lbuf;
1838 unsigned long tmp[2];
1843 if (!access_ok(VERIFY_READ, buf, count))
1846 /* lock out vcpus from running while we're doing this */
1847 mutex_lock(&kvm->lock);
1848 hpte_setup = kvm->arch.hpte_setup_done;
1850 kvm->arch.hpte_setup_done = 0; /* temporarily */
1851 /* order hpte_setup_done vs. vcpus_running */
1853 if (atomic_read(&kvm->arch.vcpus_running)) {
1854 kvm->arch.hpte_setup_done = 1;
1855 mutex_unlock(&kvm->lock);
1861 for (nb = 0; nb + sizeof(hdr) <= count; ) {
1863 if (__copy_from_user(&hdr, buf, sizeof(hdr)))
1867 if (nb + hdr.n_valid * HPTE_SIZE > count)
1875 if (i >= kvmppc_hpt_npte(&kvm->arch.hpt) ||
1876 i + hdr.n_valid + hdr.n_invalid > kvmppc_hpt_npte(&kvm->arch.hpt))
1879 hptp = (__be64 *)(kvm->arch.hpt.virt + (i * HPTE_SIZE));
1880 lbuf = (unsigned long __user *)buf;
1881 for (j = 0; j < hdr.n_valid; ++j) {
1886 if (__get_user(hpte_v, lbuf) ||
1887 __get_user(hpte_r, lbuf + 1))
1889 v = be64_to_cpu(hpte_v);
1890 r = be64_to_cpu(hpte_r);
1892 if (!(v & HPTE_V_VALID))
1897 if (be64_to_cpu(hptp[0]) & (HPTE_V_VALID | HPTE_V_ABSENT))
1898 kvmppc_do_h_remove(kvm, 0, i, 0, tmp);
1900 ret = kvmppc_virtmode_do_h_enter(kvm, H_EXACT, i, v, r,
1902 if (ret != H_SUCCESS) {
1903 pr_err("kvm_htab_write ret %ld i=%ld v=%lx "
1904 "r=%lx\n", ret, i, v, r);
1907 if (!hpte_setup && is_vrma_hpte(v)) {
1908 unsigned long psize = hpte_base_page_size(v, r);
1909 unsigned long senc = slb_pgsize_encoding(psize);
1912 kvm->arch.vrma_slb_v = senc | SLB_VSID_B_1T |
1913 (VRMA_VSID << SLB_VSID_SHIFT_1T);
1914 lpcr = senc << (LPCR_VRMASD_SH - 4);
1915 kvmppc_update_lpcr(kvm, lpcr, LPCR_VRMASD);
1922 for (j = 0; j < hdr.n_invalid; ++j) {
1923 if (be64_to_cpu(hptp[0]) & (HPTE_V_VALID | HPTE_V_ABSENT))
1924 kvmppc_do_h_remove(kvm, 0, i, 0, tmp);
1932 /* Order HPTE updates vs. hpte_setup_done */
1934 kvm->arch.hpte_setup_done = hpte_setup;
1935 mutex_unlock(&kvm->lock);
1942 static int kvm_htab_release(struct inode *inode, struct file *filp)
1944 struct kvm_htab_ctx *ctx = filp->private_data;
1946 filp->private_data = NULL;
1947 if (!(ctx->flags & KVM_GET_HTAB_WRITE))
1948 atomic_dec(&ctx->kvm->arch.hpte_mod_interest);
1949 kvm_put_kvm(ctx->kvm);
1954 static const struct file_operations kvm_htab_fops = {
1955 .read = kvm_htab_read,
1956 .write = kvm_htab_write,
1957 .llseek = default_llseek,
1958 .release = kvm_htab_release,
1961 int kvm_vm_ioctl_get_htab_fd(struct kvm *kvm, struct kvm_get_htab_fd *ghf)
1964 struct kvm_htab_ctx *ctx;
1967 /* reject flags we don't recognize */
1968 if (ghf->flags & ~(KVM_GET_HTAB_BOLTED_ONLY | KVM_GET_HTAB_WRITE))
1970 ctx = kzalloc(sizeof(*ctx), GFP_KERNEL);
1975 ctx->index = ghf->start_index;
1976 ctx->flags = ghf->flags;
1977 ctx->first_pass = 1;
1979 rwflag = (ghf->flags & KVM_GET_HTAB_WRITE) ? O_WRONLY : O_RDONLY;
1980 ret = anon_inode_getfd("kvm-htab", &kvm_htab_fops, ctx, rwflag | O_CLOEXEC);
1987 if (rwflag == O_RDONLY) {
1988 mutex_lock(&kvm->slots_lock);
1989 atomic_inc(&kvm->arch.hpte_mod_interest);
1990 /* make sure kvmppc_do_h_enter etc. see the increment */
1991 synchronize_srcu_expedited(&kvm->srcu);
1992 mutex_unlock(&kvm->slots_lock);
1998 struct debugfs_htab_state {
2001 unsigned long hpt_index;
2007 static int debugfs_htab_open(struct inode *inode, struct file *file)
2009 struct kvm *kvm = inode->i_private;
2010 struct debugfs_htab_state *p;
2012 p = kzalloc(sizeof(*p), GFP_KERNEL);
2018 mutex_init(&p->mutex);
2019 file->private_data = p;
2021 return nonseekable_open(inode, file);
2024 static int debugfs_htab_release(struct inode *inode, struct file *file)
2026 struct debugfs_htab_state *p = file->private_data;
2028 kvm_put_kvm(p->kvm);
2033 static ssize_t debugfs_htab_read(struct file *file, char __user *buf,
2034 size_t len, loff_t *ppos)
2036 struct debugfs_htab_state *p = file->private_data;
2039 unsigned long v, hr, gr;
2043 ret = mutex_lock_interruptible(&p->mutex);
2047 if (p->chars_left) {
2051 r = copy_to_user(buf, p->buf + p->buf_index, n);
2067 hptp = (__be64 *)(kvm->arch.hpt.virt + (i * HPTE_SIZE));
2068 for (; len != 0 && i < kvmppc_hpt_npte(&kvm->arch.hpt);
2070 if (!(be64_to_cpu(hptp[0]) & (HPTE_V_VALID | HPTE_V_ABSENT)))
2073 /* lock the HPTE so it's stable and read it */
2075 while (!try_lock_hpte(hptp, HPTE_V_HVLOCK))
2077 v = be64_to_cpu(hptp[0]) & ~HPTE_V_HVLOCK;
2078 hr = be64_to_cpu(hptp[1]);
2079 gr = kvm->arch.hpt.rev[i].guest_rpte;
2080 unlock_hpte(hptp, v);
2083 if (!(v & (HPTE_V_VALID | HPTE_V_ABSENT)))
2086 n = scnprintf(p->buf, sizeof(p->buf),
2087 "%6lx %.16lx %.16lx %.16lx\n",
2092 r = copy_to_user(buf, p->buf, n);
2108 mutex_unlock(&p->mutex);
2112 static ssize_t debugfs_htab_write(struct file *file, const char __user *buf,
2113 size_t len, loff_t *ppos)
2118 static const struct file_operations debugfs_htab_fops = {
2119 .owner = THIS_MODULE,
2120 .open = debugfs_htab_open,
2121 .release = debugfs_htab_release,
2122 .read = debugfs_htab_read,
2123 .write = debugfs_htab_write,
2124 .llseek = generic_file_llseek,
2127 void kvmppc_mmu_debugfs_init(struct kvm *kvm)
2129 kvm->arch.htab_dentry = debugfs_create_file("htab", 0400,
2130 kvm->arch.debugfs_dir, kvm,
2131 &debugfs_htab_fops);
2134 void kvmppc_mmu_book3s_hv_init(struct kvm_vcpu *vcpu)
2136 struct kvmppc_mmu *mmu = &vcpu->arch.mmu;
2138 vcpu->arch.slb_nr = 32; /* POWER7/POWER8 */
2140 if (kvm_is_radix(vcpu->kvm))
2141 mmu->xlate = kvmppc_mmu_radix_xlate;
2143 mmu->xlate = kvmppc_mmu_book3s_64_hv_xlate;
2144 mmu->reset_msr = kvmppc_mmu_book3s_64_hv_reset_msr;
2146 vcpu->arch.hflags |= BOOK3S_HFLAG_SLB;