diff options
Diffstat (limited to 'arch/powerpc/kvm/book3s_64_mmu_hv.c')
| -rw-r--r-- | arch/powerpc/kvm/book3s_64_mmu_hv.c | 635 |
1 files changed, 515 insertions, 120 deletions
diff --git a/arch/powerpc/kvm/book3s_64_mmu_hv.c b/arch/powerpc/kvm/book3s_64_mmu_hv.c index 9df3d940acec..f3158fb16de3 100644 --- a/arch/powerpc/kvm/book3s_64_mmu_hv.c +++ b/arch/powerpc/kvm/book3s_64_mmu_hv.c @@ -40,84 +40,101 @@ #include "trace_hv.h" -/* Power architecture requires HPT is at least 256kB */ -#define PPC_MIN_HPT_ORDER 18 +//#define DEBUG_RESIZE_HPT 1 + +#ifdef DEBUG_RESIZE_HPT +#define resize_hpt_debug(resize, ...) \ + do { \ + printk(KERN_DEBUG "RESIZE HPT %p: ", resize); \ + printk(__VA_ARGS__); \ + } while (0) +#else +#define resize_hpt_debug(resize, ...) \ + do { } while (0) +#endif static long kvmppc_virtmode_do_h_enter(struct kvm *kvm, unsigned long flags, long pte_index, unsigned long pteh, unsigned long ptel, unsigned long *pte_idx_ret); + +struct kvm_resize_hpt { + /* These fields read-only after init */ + struct kvm *kvm; + struct work_struct work; + u32 order; + + /* These fields protected by kvm->lock */ + int error; + bool prepare_done; + + /* Private to the work thread, until prepare_done is true, + * then protected by kvm->resize_hpt_sem */ + struct kvm_hpt_info hpt; +}; + static void kvmppc_rmap_reset(struct kvm *kvm); -long kvmppc_alloc_hpt(struct kvm *kvm, u32 *htab_orderp) +int kvmppc_allocate_hpt(struct kvm_hpt_info *info, u32 order) { unsigned long hpt = 0; - struct revmap_entry *rev; + int cma = 0; struct page *page = NULL; - long order = KVM_DEFAULT_HPT_ORDER; + struct revmap_entry *rev; + unsigned long npte; - if (htab_orderp) { - order = *htab_orderp; - if (order < PPC_MIN_HPT_ORDER) - order = PPC_MIN_HPT_ORDER; - } + if ((order < PPC_MIN_HPT_ORDER) || (order > PPC_MAX_HPT_ORDER)) + return -EINVAL; - kvm->arch.hpt_cma_alloc = 0; - page = kvm_alloc_hpt(1ul << (order - PAGE_SHIFT)); + page = kvm_alloc_hpt_cma(1ul << (order - PAGE_SHIFT)); if (page) { hpt = (unsigned long)pfn_to_kaddr(page_to_pfn(page)); memset((void *)hpt, 0, (1ul << order)); - kvm->arch.hpt_cma_alloc = 1; + cma = 1; } - /* Lastly try successively smaller sizes from the page allocator */ - /* Only do this if userspace didn't specify a size via ioctl */ - while (!hpt && order > PPC_MIN_HPT_ORDER && !htab_orderp) { - hpt = __get_free_pages(GFP_KERNEL|__GFP_ZERO|__GFP_REPEAT| - __GFP_NOWARN, order - PAGE_SHIFT); - if (!hpt) - --order; - } + if (!hpt) + hpt = __get_free_pages(GFP_KERNEL|__GFP_ZERO|__GFP_REPEAT + |__GFP_NOWARN, order - PAGE_SHIFT); if (!hpt) return -ENOMEM; - kvm->arch.hpt_virt = hpt; - kvm->arch.hpt_order = order; /* HPTEs are 2**4 bytes long */ - kvm->arch.hpt_npte = 1ul << (order - 4); - /* 128 (2**7) bytes in each HPTEG */ - kvm->arch.hpt_mask = (1ul << (order - 7)) - 1; - - atomic64_set(&kvm->arch.mmio_update, 0); + npte = 1ul << (order - 4); /* Allocate reverse map array */ - rev = vmalloc(sizeof(struct revmap_entry) * kvm->arch.hpt_npte); + rev = vmalloc(sizeof(struct revmap_entry) * npte); if (!rev) { - pr_err("kvmppc_alloc_hpt: Couldn't alloc reverse map array\n"); - goto out_freehpt; + pr_err("kvmppc_allocate_hpt: Couldn't alloc reverse map array\n"); + if (cma) + kvm_free_hpt_cma(page, 1 << (order - PAGE_SHIFT)); + else + free_pages(hpt, order - PAGE_SHIFT); + return -ENOMEM; } - kvm->arch.revmap = rev; - kvm->arch.sdr1 = __pa(hpt) | (order - 18); - pr_info("KVM guest htab at %lx (order %ld), LPID %x\n", - hpt, order, kvm->arch.lpid); + info->order = order; + info->virt = hpt; + info->cma = cma; + info->rev = rev; - if (htab_orderp) - *htab_orderp = order; return 0; +} - out_freehpt: - if (kvm->arch.hpt_cma_alloc) - kvm_release_hpt(page, 1 << (order - PAGE_SHIFT)); - else - free_pages(hpt, order - PAGE_SHIFT); - return -ENOMEM; +void kvmppc_set_hpt(struct kvm *kvm, struct kvm_hpt_info *info) +{ + atomic64_set(&kvm->arch.mmio_update, 0); + kvm->arch.hpt = *info; + kvm->arch.sdr1 = __pa(info->virt) | (info->order - 18); + + pr_debug("KVM guest htab at %lx (order %ld), LPID %x\n", + info->virt, (long)info->order, kvm->arch.lpid); } -long kvmppc_alloc_reset_hpt(struct kvm *kvm, u32 *htab_orderp) +long kvmppc_alloc_reset_hpt(struct kvm *kvm, int order) { long err = -EBUSY; - long order; + struct kvm_hpt_info info; if (kvm_is_radix(kvm)) return -EINVAL; @@ -132,36 +149,44 @@ long kvmppc_alloc_reset_hpt(struct kvm *kvm, u32 *htab_orderp) goto out; } } - if (kvm->arch.hpt_virt) { - order = kvm->arch.hpt_order; + if (kvm->arch.hpt.order == order) { + /* We already have a suitable HPT */ + /* Set the entire HPT to 0, i.e. invalid HPTEs */ - memset((void *)kvm->arch.hpt_virt, 0, 1ul << order); + memset((void *)kvm->arch.hpt.virt, 0, 1ul << order); /* * Reset all the reverse-mapping chains for all memslots */ kvmppc_rmap_reset(kvm); /* Ensure that each vcpu will flush its TLB on next entry. */ cpumask_setall(&kvm->arch.need_tlb_flush); - *htab_orderp = order; err = 0; - } else { - err = kvmppc_alloc_hpt(kvm, htab_orderp); - order = *htab_orderp; + goto out; } - out: + + if (kvm->arch.hpt.virt) + kvmppc_free_hpt(&kvm->arch.hpt); + + err = kvmppc_allocate_hpt(&info, order); + if (err < 0) + goto out; + kvmppc_set_hpt(kvm, &info); + +out: mutex_unlock(&kvm->lock); return err; } -void kvmppc_free_hpt(struct kvm *kvm) +void kvmppc_free_hpt(struct kvm_hpt_info *info) { - vfree(kvm->arch.revmap); - if (kvm->arch.hpt_cma_alloc) - kvm_release_hpt(virt_to_page(kvm->arch.hpt_virt), - 1 << (kvm->arch.hpt_order - PAGE_SHIFT)); - else if (kvm->arch.hpt_virt) - free_pages(kvm->arch.hpt_virt, - kvm->arch.hpt_order - PAGE_SHIFT); + vfree(info->rev); + if (info->cma) + kvm_free_hpt_cma(virt_to_page(info->virt), + 1 << (info->order - PAGE_SHIFT)); + else if (info->virt) + free_pages(info->virt, info->order - PAGE_SHIFT); + info->virt = 0; + info->order = 0; } /* Bits in first HPTE dword for pagesize 4k, 64k or 16M */ @@ -196,8 +221,8 @@ void kvmppc_map_vrma(struct kvm_vcpu *vcpu, struct kvm_memory_slot *memslot, if (npages > 1ul << (40 - porder)) npages = 1ul << (40 - porder); /* Can't use more than 1 HPTE per HPTEG */ - if (npages > kvm->arch.hpt_mask + 1) - npages = kvm->arch.hpt_mask + 1; + if (npages > kvmppc_hpt_mask(&kvm->arch.hpt) + 1) + npages = kvmppc_hpt_mask(&kvm->arch.hpt) + 1; hp0 = HPTE_V_1TB_SEG | (VRMA_VSID << (40 - 16)) | HPTE_V_BOLTED | hpte0_pgsize_encoding(psize); @@ -207,7 +232,8 @@ void kvmppc_map_vrma(struct kvm_vcpu *vcpu, struct kvm_memory_slot *memslot, for (i = 0; i < npages; ++i) { addr = i << porder; /* can't use hpt_hash since va > 64 bits */ - hash = (i ^ (VRMA_VSID ^ (VRMA_VSID << 25))) & kvm->arch.hpt_mask; + hash = (i ^ (VRMA_VSID ^ (VRMA_VSID << 25))) + & kvmppc_hpt_mask(&kvm->arch.hpt); /* * We assume that the hash table is empty and no * vcpus are using it at this stage. Since we create @@ -340,11 +366,11 @@ static int kvmppc_mmu_book3s_64_hv_xlate(struct kvm_vcpu *vcpu, gva_t eaddr, preempt_enable(); return -ENOENT; } - hptep = (__be64 *)(kvm->arch.hpt_virt + (index << 4)); + hptep = (__be64 *)(kvm->arch.hpt.virt + (index << 4)); v = orig_v = be64_to_cpu(hptep[0]) & ~HPTE_V_HVLOCK; if (cpu_has_feature(CPU_FTR_ARCH_300)) v = hpte_new_to_old_v(v, be64_to_cpu(hptep[1])); - gr = kvm->arch.revmap[index].guest_rpte; + gr = kvm->arch.hpt.rev[index].guest_rpte; unlock_hpte(hptep, orig_v); preempt_enable(); @@ -485,8 +511,8 @@ int kvmppc_book3s_hv_page_fault(struct kvm_run *run, struct kvm_vcpu *vcpu, } } index = vcpu->arch.pgfault_index; - hptep = (__be64 *)(kvm->arch.hpt_virt + (index << 4)); - rev = &kvm->arch.revmap[index]; + hptep = (__be64 *)(kvm->arch.hpt.virt + (index << 4)); + rev = &kvm->arch.hpt.rev[index]; preempt_disable(); while (!try_lock_hpte(hptep, HPTE_V_HVLOCK)) cpu_relax(); @@ -745,13 +771,53 @@ static int kvm_handle_hva(struct kvm *kvm, unsigned long hva, return kvm_handle_hva_range(kvm, hva, hva + 1, handler); } +/* Must be called with both HPTE and rmap locked */ +static void kvmppc_unmap_hpte(struct kvm *kvm, unsigned long i, + unsigned long *rmapp, unsigned long gfn) +{ + __be64 *hptep = (__be64 *) (kvm->arch.hpt.virt + (i << 4)); + struct revmap_entry *rev = kvm->arch.hpt.rev; + unsigned long j, h; + unsigned long ptel, psize, rcbits; + + j = rev[i].forw; + if (j == i) { + /* chain is now empty */ + *rmapp &= ~(KVMPPC_RMAP_PRESENT | KVMPPC_RMAP_INDEX); + } else { + /* remove i from chain */ + h = rev[i].back; + rev[h].forw = j; + rev[j].back = h; + rev[i].forw = rev[i].back = i; + *rmapp = (*rmapp & ~KVMPPC_RMAP_INDEX) | j; + } + + /* Now check and modify the HPTE */ + ptel = rev[i].guest_rpte; + psize = hpte_page_size(be64_to_cpu(hptep[0]), ptel); + if ((be64_to_cpu(hptep[0]) & HPTE_V_VALID) && + hpte_rpn(ptel, psize) == gfn) { + hptep[0] |= cpu_to_be64(HPTE_V_ABSENT); + kvmppc_invalidate_hpte(kvm, hptep, i); + hptep[1] &= ~cpu_to_be64(HPTE_R_KEY_HI | HPTE_R_KEY_LO); + /* Harvest R and C */ + rcbits = be64_to_cpu(hptep[1]) & (HPTE_R_R | HPTE_R_C); + *rmapp |= rcbits << KVMPPC_RMAP_RC_SHIFT; + if (rcbits & HPTE_R_C) + kvmppc_update_rmap_change(rmapp, psize); + if (rcbits & ~rev[i].guest_rpte) { + rev[i].guest_rpte = ptel | rcbits; + note_hpte_modification(kvm, &rev[i]); + } + } +} + static int kvm_unmap_rmapp(struct kvm *kvm, struct kvm_memory_slot *memslot, unsigned long gfn) { - struct revmap_entry *rev = kvm->arch.revmap; - unsigned long h, i, j; + unsigned long i; __be64 *hptep; - unsigned long ptel, psize, rcbits; unsigned long *rmapp; rmapp = &memslot->arch.rmap[gfn - memslot->base_gfn]; @@ -768,7 +834,7 @@ static int kvm_unmap_rmapp(struct kvm *kvm, struct kvm_memory_slot *memslot, * rmap chain lock. */ i = *rmapp & KVMPPC_RMAP_INDEX; - hptep = (__be64 *) (kvm->arch.hpt_virt + (i << 4)); + hptep = (__be64 *) (kvm->arch.hpt.virt + (i << 4)); if (!try_lock_hpte(hptep, HPTE_V_HVLOCK)) { /* unlock rmap before spinning on the HPTE lock */ unlock_rmap(rmapp); @@ -776,37 +842,8 @@ static int kvm_unmap_rmapp(struct kvm *kvm, struct kvm_memory_slot *memslot, cpu_relax(); continue; } - j = rev[i].forw; - if (j == i) { - /* chain is now empty */ - *rmapp &= ~(KVMPPC_RMAP_PRESENT | KVMPPC_RMAP_INDEX); - } else { - /* remove i from chain */ - h = rev[i].back; - rev[h].forw = j; - rev[j].back = h; - rev[i].forw = rev[i].back = i; - *rmapp = (*rmapp & ~KVMPPC_RMAP_INDEX) | j; - } - /* Now check and modify the HPTE */ - ptel = rev[i].guest_rpte; - psize = hpte_page_size(be64_to_cpu(hptep[0]), ptel); - if ((be64_to_cpu(hptep[0]) & HPTE_V_VALID) && - hpte_rpn(ptel, psize) == gfn) { - hptep[0] |= cpu_to_be64(HPTE_V_ABSENT); - kvmppc_invalidate_hpte(kvm, hptep, i); - hptep[1] &= ~cpu_to_be64(HPTE_R_KEY_HI | HPTE_R_KEY_LO); - /* Harvest R and C */ - rcbits = be64_to_cpu(hptep[1]) & (HPTE_R_R | HPTE_R_C); - *rmapp |= rcbits << KVMPPC_RMAP_RC_SHIFT; - if (rcbits & HPTE_R_C) - kvmppc_update_rmap_change(rmapp, psize); - if (rcbits & ~rev[i].guest_rpte) { - rev[i].guest_rpte = ptel | rcbits; - note_hpte_modification(kvm, &rev[i]); - } - } + kvmppc_unmap_hpte(kvm, i, rmapp, gfn); unlock_rmap(rmapp); __unlock_hpte(hptep, be64_to_cpu(hptep[0])); } @@ -860,7 +897,7 @@ void kvmppc_core_flush_memslot_hv(struct kvm *kvm, static int kvm_age_rmapp(struct kvm *kvm, struct kvm_memory_slot *memslot, unsigned long gfn) { - struct revmap_entry *rev = kvm->arch.revmap; + struct revmap_entry *rev = kvm->arch.hpt.rev; unsigned long head, i, j; __be64 *hptep; int ret = 0; @@ -880,7 +917,7 @@ static int kvm_age_rmapp(struct kvm *kvm, struct kvm_memory_slot *memslot, i = head = *rmapp & KVMPPC_RMAP_INDEX; do { - hptep = (__be64 *) (kvm->arch.hpt_virt + (i << 4)); + hptep = (__be64 *) (kvm->arch.hpt.virt + (i << 4)); j = rev[i].forw; /* If this HPTE isn't referenced, ignore it */ @@ -923,7 +960,7 @@ int kvm_age_hva_hv(struct kvm *kvm, unsigned long start, unsigned long end) static int kvm_test_age_rmapp(struct kvm *kvm, struct kvm_memory_slot *memslot, unsigned long gfn) { - struct revmap_entry *rev = kvm->arch.revmap; + struct revmap_entry *rev = kvm->arch.hpt.rev; unsigned long head, i, j; unsigned long *hp; int ret = 1; @@ -940,7 +977,7 @@ static int kvm_test_age_rmapp(struct kvm *kvm, struct kvm_memory_slot *memslot, if (*rmapp & KVMPPC_RMAP_PRESENT) { i = head = *rmapp & KVMPPC_RMAP_INDEX; do { - hp = (unsigned long *)(kvm->arch.hpt_virt + (i << 4)); + hp = (unsigned long *)(kvm->arch.hpt.virt + (i << 4)); j = rev[i].forw; if (be64_to_cpu(hp[1]) & HPTE_R_R) goto out; @@ -980,7 +1017,7 @@ static int vcpus_running(struct kvm *kvm) */ static int kvm_test_clear_dirty_npages(struct kvm *kvm, unsigned long *rmapp) { - struct revmap_entry *rev = kvm->arch.revmap; + struct revmap_entry *rev = kvm->arch.hpt.rev; unsigned long head, i, j; unsigned long n; unsigned long v, r; @@ -1005,7 +1042,7 @@ static int kvm_test_clear_dirty_npages(struct kvm *kvm, unsigned long *rmapp) i = head = *rmapp & KVMPPC_RMAP_INDEX; do { unsigned long hptep1; - hptep = (__be64 *) (kvm->arch.hpt_virt + (i << 4)); + hptep = (__be64 *) (kvm->arch.hpt.virt + (i << 4)); j = rev[i].forw; /* @@ -1172,6 +1209,363 @@ void kvmppc_unpin_guest_page(struct kvm *kvm, void *va, unsigned long gpa, } /* + * HPT resizing + */ +static int resize_hpt_allocate(struct kvm_resize_hpt *resize) +{ + int rc; + + rc = kvmppc_allocate_hpt(&resize->hpt, resize->order); + if (rc < 0) + return rc; + + resize_hpt_debug(resize, "resize_hpt_allocate(): HPT @ 0x%lx\n", + resize->hpt.virt); + + return 0; +} + +static unsigned long resize_hpt_rehash_hpte(struct kvm_resize_hpt *resize, + unsigned long idx) +{ + struct kvm *kvm = resize->kvm; + struct kvm_hpt_info *old = &kvm->arch.hpt; + struct kvm_hpt_info *new = &resize->hpt; + unsigned long old_hash_mask = (1ULL << (old->order - 7)) - 1; + unsigned long new_hash_mask = (1ULL << (new->order - 7)) - 1; + __be64 *hptep, *new_hptep; + unsigned long vpte, rpte, guest_rpte; + int ret; + struct revmap_entry *rev; + unsigned long apsize, psize, avpn, pteg, hash; + unsigned long new_idx, new_pteg, replace_vpte; + + hptep = (__be64 *)(old->virt + (idx << 4)); + + /* Guest is stopped, so new HPTEs can't be added or faulted + * in, only unmapped or altered by host actions. So, it's + * safe to check this before we take the HPTE lock */ + vpte = be64_to_cpu(hptep[0]); + if (!(vpte & HPTE_V_VALID) && !(vpte & HPTE_V_ABSENT)) + return 0; /* nothing to do */ + + while (!try_lock_hpte(hptep, HPTE_V_HVLOCK)) + cpu_relax(); + + vpte = be64_to_cpu(hptep[0]); + + ret = 0; + if (!(vpte & HPTE_V_VALID) && !(vpte & HPTE_V_ABSENT)) + /* Nothing to do */ + goto out; + + /* Unmap */ + rev = &old->rev[idx]; + guest_rpte = rev->guest_rpte; + + ret = -EIO; + apsize = hpte_page_size(vpte, guest_rpte); + if (!apsize) + goto out; + + if (vpte & HPTE_V_VALID) { + unsigned long gfn = hpte_rpn(guest_rpte, apsize); + int srcu_idx = srcu_read_lock(&kvm->srcu); + struct kvm_memory_slot *memslot = + __gfn_to_memslot(kvm_memslots(kvm), gfn); + + if (memslot) { + unsigned long *rmapp; + rmapp = &memslot->arch.rmap[gfn - memslot->base_gfn]; + + lock_rmap(rmapp); + kvmppc_unmap_hpte(kvm, idx, rmapp, gfn); + unlock_rmap(rmapp); + } + + srcu_read_unlock(&kvm->srcu, srcu_idx); + } + + /* Reload PTE after unmap */ + vpte = be64_to_cpu(hptep[0]); + + BUG_ON(vpte & HPTE_V_VALID); + BUG_ON(!(vpte & HPTE_V_ABSENT)); + + ret = 0; + if (!(vpte & HPTE_V_BOLTED)) + goto out; + + rpte = be64_to_cpu(hptep[1]); + psize = hpte_base_page_size(vpte, rpte); + avpn = HPTE_V_AVPN_VAL(vpte) & ~((psize - 1) >> 23); + pteg = idx / HPTES_PER_GROUP; + if (vpte & HPTE_V_SECONDARY) + pteg = ~pteg; + + if (!(vpte & HPTE_V_1TB_SEG)) { + unsigned long offset, vsid; + + /* We only have 28 - 23 bits of offset in avpn */ + offset = (avpn & 0x1f) << 23; + vsid = avpn >> 5; + /* We can find more bits from the pteg value */ + if (psize < (1ULL << 23)) + offset |= ((vsid ^ pteg) & old_hash_mask) * psize; + + hash = vsid ^ (offset / psize); + } else { + unsigned long offset, vsid; + + /* We only have 40 - 23 bits of seg_off in avpn */ + offset = (avpn & 0x1ffff) << 23; + vsid = avpn >> 17; + if (psize < (1ULL << 23)) + offset |= ((vsid ^ (vsid << 25) ^ pteg) & old_hash_mask) * psize; + + hash = vsid ^ (vsid << 25) ^ (offset / psize); + } + + new_pteg = hash & new_hash_mask; + if (vpte & HPTE_V_SECONDARY) { + BUG_ON(~pteg != (hash & old_hash_mask)); + new_pteg = ~new_pteg; + } else { + BUG_ON(pteg != (hash & old_hash_mask)); + } + + new_idx = new_pteg * HPTES_PER_GROUP + (idx % HPTES_PER_GROUP); + new_hptep = (__be64 *)(new->virt + (new_idx << 4)); + + replace_vpte = be64_to_cpu(new_hptep[0]); + + if (replace_vpte & (HPTE_V_VALID | HPTE_V_ABSENT)) { + BUG_ON(new->order >= old->order); + + if (replace_vpte & HPTE_V_BOLTED) { + if (vpte & HPTE_V_BOLTED) + /* Bolted collision, nothing we can do */ + ret = -ENOSPC; + /* Discard the new HPTE */ + goto out; + } + + /* Discard the previous HPTE */ + } + + new_hptep[1] = cpu_to_be64(rpte); + new->rev[new_idx].guest_rpte = guest_rpte; + /* No need for a barrier, since new HPT isn't active */ + new_hptep[0] = cpu_to_be64(vpte); + unlock_hpte(new_hptep, vpte); + +out: + unlock_hpte(hptep, vpte); + return ret; +} + +static int resize_hpt_rehash(struct kvm_resize_hpt *resize) +{ + struct kvm *kvm = resize->kvm; + unsigned long i; + int rc; + + /* + * resize_hpt_rehash_hpte() doesn't handle the new-format HPTEs + * that POWER9 uses, and could well hit a BUG_ON on POWER9. + */ + if (cpu_has_feature(CPU_FTR_ARCH_300)) + return -EIO; + for (i = 0; i < kvmppc_hpt_npte(&kvm->arch.hpt); i++) { + rc = resize_hpt_rehash_hpte(resize, i); + if (rc != 0) + return rc; + } + + return 0; +} + +static void resize_hpt_pivot(struct kvm_resize_hpt *resize) +{ + struct kvm *kvm = resize->kvm; + struct kvm_hpt_info hpt_tmp; + + /* Exchange the pending tables in the resize structure with + * the active tables */ + + resize_hpt_debug(resize, "resize_hpt_pivot()\n"); + + spin_lock(&kvm->mmu_lock); + asm volatile("ptesync" : : : "memory"); + + hpt_tmp = kvm->arch.hpt; + kvmppc_set_hpt(kvm, &resize->hpt); + resize->hpt = hpt_tmp; + + spin_unlock(&kvm->mmu_lock); + + synchronize_srcu_expedited(&kvm->srcu); + + resize_hpt_debug(resize, "resize_hpt_pivot() done\n"); +} + +static void resize_hpt_release(struct kvm *kvm, struct kvm_resize_hpt *resize) +{ + BUG_ON(kvm->arch.resize_hpt != resize); + + if (!resize) + return; + + if (resize->hpt.virt) + kvmppc_free_hpt(&resize->hpt); + + kvm->arch.resize_hpt = NULL; + kfree(resize); +} + +static void resize_hpt_prepare_work(struct work_struct *work) +{ + struct kvm_resize_hpt *resize = container_of(work, + struct kvm_resize_hpt, + work); + struct kvm *kvm = resize->kvm; + int err; + + resize_hpt_debug(resize, "resize_hpt_prepare_work(): order = %d\n", + resize->order); + + err = resize_hpt_allocate(resize); + + mutex_lock(&kvm->lock); + + resize->error = err; + resize->prepare_done = true; + + mutex_unlock(&kvm->lock); +} + +long kvm_vm_ioctl_resize_hpt_prepare(struct kvm *kvm, + struct kvm_ppc_resize_hpt *rhpt) +{ + unsigned long flags = rhpt->flags; + unsigned long shift = rhpt->shift; + struct kvm_resize_hpt *resize; + int ret; + + if (flags != 0) + return -EINVAL; + + if (shift && ((shift < 18) || (shift > 46))) + return -EINVAL; + + mutex_lock(&kvm->lock); + + resize = kvm->arch.resize_hpt; + + if (resize) { + if (resize->order == shift) { + /* Suitable resize in progress */ + if (resize->prepare_done) { + ret = resize->error; + if (ret != 0) + resize_hpt_release(kvm, resize); + } else { + ret = 100; /* estimated time in ms */ + } + + goto out; + } + + /* not suitable, cancel it */ + resize_hpt_release(kvm, resize); + } + + ret = 0; + if (!shift) + goto out; /* nothing to do */ + + /* start new resize */ + + resize = kzalloc(sizeof(*resize), GFP_KERNEL); + resize->order = shift; + resize->kvm = kvm; + INIT_WORK(&resize->work, resize_hpt_prepare_work); + kvm->arch.resize_hpt = resize; + + schedule_work(&resize->work); + + ret = 100; /* estimated time in ms */ + +out: + mutex_unlock(&kvm->lock); + return ret; +} + +static void resize_hpt_boot_vcpu(void *opaque) +{ + /* Nothing to do, just force a KVM exit */ +} + +long kvm_vm_ioctl_resize_hpt_commit(struct kvm *kvm, + struct kvm_ppc_resize_hpt *rhpt) +{ + unsigned long flags = rhpt->flags; + unsigned long shift = rhpt->shift; + struct kvm_resize_hpt *resize; + long ret; + + if (flags != 0) + return -EINVAL; + + if (shift && ((shift < 18) || (shift > 46))) + return -EINVAL; + + mutex_lock(&kvm->lock); + + resize = kvm->arch.resize_hpt; + + /* This shouldn't be possible */ + ret = -EIO; + if (WARN_ON(!kvm->arch.hpte_setup_done)) + goto out_no_hpt; + + /* Stop VCPUs from running while we mess with the HPT */ + kvm->arch.hpte_setup_done = 0; + smp_mb(); + + /* Boot all CPUs out of the guest so they re-read + * hpte_setup_done */ + on_each_cpu(resize_hpt_boot_vcpu, NULL, 1); + + ret = -ENXIO; + if (!resize || (resize->order != shift)) + goto out; + + ret = -EBUSY; + if (!resize->prepare_done) + goto out; + + ret = resize->error; + if (ret != 0) + goto out; + + ret = resize_hpt_rehash(resize); + if (ret != 0) + goto out; + + resize_hpt_pivot(resize); + +out: + /* Let VCPUs run again */ + kvm->arch.hpte_setup_done = 1; + smp_mb(); +out_no_hpt: + resize_hpt_release(kvm, resize); + mutex_unlock(&kvm->lock); + return ret; +} + +/* * Functions for reading and writing the hash table via reads and * writes on a file descriptor. * @@ -1311,8 +1705,8 @@ static ssize_t kvm_htab_read(struct file *file, char __user *buf, flags = ctx->flags; i = ctx->index; - hptp = (__be64 *)(kvm->arch.hpt_virt + (i * HPTE_SIZE)); - revp = kvm->arch.revmap + i; + hptp = (__be64 *)(kvm->arch.hpt.virt + (i * HPTE_SIZE)); + revp = kvm->arch.hpt.rev + i; lbuf = (unsigned long __user *)buf; nb = 0; @@ -1327,7 +1721,7 @@ static ssize_t kvm_htab_read(struct file *file, char __user *buf, /* Skip uninteresting entries, i.e. clean on not-first pass */ if (!first_pass) { - while (i < kvm->arch.hpt_npte && + while (i < kvmppc_hpt_npte(&kvm->arch.hpt) && !hpte_dirty(revp, hptp)) { ++i; hptp += 2; @@ -1337,7 +1731,7 @@ static ssize_t kvm_htab_read(struct file *file, char __user *buf, hdr.index = i; /* Grab a series of valid entries */ - while (i < kvm->arch.hpt_npte && + while (i < kvmppc_hpt_npte(&kvm->arch.hpt) && hdr.n_valid < 0xffff && nb + HPTE_SIZE < count && record_hpte(flags, hptp, hpte, revp, 1, first_pass)) { @@ -1353,7 +1747,7 @@ static ssize_t kvm_htab_read(struct file *file, char __user *buf, ++revp; } /* Now skip invalid entries while we can */ - while (i < kvm->arch.hpt_npte && + while (i < kvmppc_hpt_npte(&kvm->arch.hpt) && hdr.n_invalid < 0xffff && record_hpte(flags, hptp, hpte, revp, 0, first_pass)) { /* found an invalid entry */ @@ -1374,7 +1768,7 @@ static ssize_t kvm_htab_read(struct file *file, char __user *buf, } /* Check if we've wrapped around the hash table */ - if (i >= kvm->arch.hpt_npte) { + if (i >= kvmppc_hpt_npte(&kvm->arch.hpt)) { i = 0; ctx->first_pass = 0; break; @@ -1433,11 +1827,11 @@ static ssize_t kvm_htab_write(struct file *file, const char __user *buf, err = -EINVAL; i = hdr.index; - if (i >= kvm->arch.hpt_npte || - i + hdr.n_valid + hdr.n_invalid > kvm->arch.hpt_npte) + if (i >= kvmppc_hpt_npte(&kvm->arch.hpt) || + i + hdr.n_valid + hdr.n_invalid > kvmppc_hpt_npte(&kvm->arch.hpt)) break; - hptp = (__be64 *)(kvm->arch.hpt_virt + (i * HPTE_SIZE)); + hptp = (__be64 *)(kvm->arch.hpt.virt + (i * HPTE_SIZE)); lbuf = (unsigned long __user *)buf; for (j = 0; j < hdr.n_valid; ++j) { __be64 hpte_v; @@ -1624,8 +2018,9 @@ static ssize_t debugfs_htab_read(struct file *file, char __user *buf, kvm = p->kvm; i = p->hpt_index; - hptp = (__be64 *)(kvm->arch.hpt_virt + (i * HPTE_SIZE)); - for (; len != 0 && i < kvm->arch.hpt_npte; ++i, hptp += 2) { + hptp = (__be64 *)(kvm->arch.hpt.virt + (i * HPTE_SIZE)); + for (; len != 0 && i < kvmppc_hpt_npte(&kvm->arch.hpt); + ++i, hptp += 2) { if (!(be64_to_cpu(hptp[0]) & (HPTE_V_VALID | HPTE_V_ABSENT))) continue; @@ -1635,7 +2030,7 @@ static ssize_t debugfs_htab_read(struct file *file, char __user *buf, cpu_relax(); v = be64_to_cpu(hptp[0]) & ~HPTE_V_HVLOCK; hr = be64_to_cpu(hptp[1]); - gr = kvm->arch.revmap[i].guest_rpte; + gr = kvm->arch.hpt.rev[i].guest_rpte; unlock_hpte(hptp, v); preempt_enable(); |