diff options
Diffstat (limited to 'arch/x86/kvm/mmu.c')
| -rw-r--r-- | arch/x86/kvm/mmu.c | 62 |
1 files changed, 44 insertions, 18 deletions
diff --git a/arch/x86/kvm/mmu.c b/arch/x86/kvm/mmu.c index 7e7c3969f7a..b0e4ddca6c1 100644 --- a/arch/x86/kvm/mmu.c +++ b/arch/x86/kvm/mmu.c @@ -66,7 +66,8 @@ static void kvm_mmu_audit(struct kvm_vcpu *vcpu, const char *msg) {} #endif #if defined(MMU_DEBUG) || defined(AUDIT) -static int dbg = 1; +static int dbg = 0; +module_param(dbg, bool, 0644); #endif #ifndef MMU_DEBUG @@ -776,6 +777,15 @@ static void mmu_page_remove_parent_pte(struct kvm_mmu_page *sp, BUG(); } +static void nonpaging_prefetch_page(struct kvm_vcpu *vcpu, + struct kvm_mmu_page *sp) +{ + int i; + + for (i = 0; i < PT64_ENT_PER_PAGE; ++i) + sp->spt[i] = shadow_trap_nonpresent_pte; +} + static struct kvm_mmu_page *kvm_mmu_lookup_page(struct kvm *kvm, gfn_t gfn) { unsigned index; @@ -841,7 +851,10 @@ static struct kvm_mmu_page *kvm_mmu_get_page(struct kvm_vcpu *vcpu, hlist_add_head(&sp->hash_link, bucket); if (!metaphysical) rmap_write_protect(vcpu->kvm, gfn); - vcpu->arch.mmu.prefetch_page(vcpu, sp); + if (shadow_trap_nonpresent_pte != shadow_notrap_nonpresent_pte) + vcpu->arch.mmu.prefetch_page(vcpu, sp); + else + nonpaging_prefetch_page(vcpu, sp); return sp; } @@ -917,14 +930,17 @@ static void kvm_mmu_zap_page(struct kvm *kvm, struct kvm_mmu_page *sp) } kvm_mmu_page_unlink_children(kvm, sp); if (!sp->root_count) { - if (!sp->role.metaphysical) + if (!sp->role.metaphysical && !sp->role.invalid) unaccount_shadowed(kvm, sp->gfn); hlist_del(&sp->hash_link); kvm_mmu_free_page(kvm, sp); } else { + int invalid = sp->role.invalid; list_move(&sp->link, &kvm->arch.active_mmu_pages); sp->role.invalid = 1; kvm_reload_remote_mmus(kvm); + if (!sp->role.metaphysical && !invalid) + unaccount_shadowed(kvm, sp->gfn); } kvm_mmu_reset_last_pte_updated(kvm); } @@ -1103,7 +1119,7 @@ static void mmu_set_spte(struct kvm_vcpu *vcpu, u64 *shadow_pte, mark_page_dirty(vcpu->kvm, gfn); pgprintk("%s: setting spte %llx\n", __func__, spte); - pgprintk("instantiating %s PTE (%s) at %d (%llx) addr %llx\n", + pgprintk("instantiating %s PTE (%s) at %ld (%llx) addr %p\n", (spte&PT_PAGE_SIZE_MASK)? "2MB" : "4kB", (spte&PT_WRITABLE_MASK)?"RW":"R", gfn, spte, shadow_pte); set_shadow_pte(shadow_pte, spte); @@ -1122,8 +1138,10 @@ static void mmu_set_spte(struct kvm_vcpu *vcpu, u64 *shadow_pte, else kvm_release_pfn_clean(pfn); } - if (!ptwrite || !*ptwrite) + if (speculative) { vcpu->arch.last_pte_updated = shadow_pte; + vcpu->arch.last_pte_gfn = gfn; + } } static void nonpaging_new_cr3(struct kvm_vcpu *vcpu) @@ -1171,9 +1189,10 @@ static int __direct_map(struct kvm_vcpu *vcpu, gpa_t v, int write, return -ENOMEM; } - table[index] = __pa(new_table->spt) - | PT_PRESENT_MASK | PT_WRITABLE_MASK - | shadow_user_mask | shadow_x_mask; + set_shadow_pte(&table[index], + __pa(new_table->spt) + | PT_PRESENT_MASK | PT_WRITABLE_MASK + | shadow_user_mask | shadow_x_mask); } table_addr = table[index] & PT64_BASE_ADDR_MASK; } @@ -1211,15 +1230,6 @@ static int nonpaging_map(struct kvm_vcpu *vcpu, gva_t v, int write, gfn_t gfn) } -static void nonpaging_prefetch_page(struct kvm_vcpu *vcpu, - struct kvm_mmu_page *sp) -{ - int i; - - for (i = 0; i < PT64_ENT_PER_PAGE; ++i) - sp->spt[i] = shadow_trap_nonpresent_pte; -} - static void mmu_free_roots(struct kvm_vcpu *vcpu) { int i; @@ -1671,6 +1681,18 @@ static void mmu_guess_page_from_pte_write(struct kvm_vcpu *vcpu, gpa_t gpa, vcpu->arch.update_pte.pfn = pfn; } +static void kvm_mmu_access_page(struct kvm_vcpu *vcpu, gfn_t gfn) +{ + u64 *spte = vcpu->arch.last_pte_updated; + + if (spte + && vcpu->arch.last_pte_gfn == gfn + && shadow_accessed_mask + && !(*spte & shadow_accessed_mask) + && is_shadow_present_pte(*spte)) + set_bit(PT_ACCESSED_SHIFT, (unsigned long *)spte); +} + void kvm_mmu_pte_write(struct kvm_vcpu *vcpu, gpa_t gpa, const u8 *new, int bytes) { @@ -1694,6 +1716,7 @@ void kvm_mmu_pte_write(struct kvm_vcpu *vcpu, gpa_t gpa, pgprintk("%s: gpa %llx bytes %d\n", __func__, gpa, bytes); mmu_guess_page_from_pte_write(vcpu, gpa, new, bytes); spin_lock(&vcpu->kvm->mmu_lock); + kvm_mmu_access_page(vcpu, gfn); kvm_mmu_free_some_pages(vcpu); ++vcpu->kvm->stat.mmu_pte_write; kvm_mmu_audit(vcpu, "pre pte write"); @@ -1948,7 +1971,7 @@ void kvm_mmu_zap_all(struct kvm *kvm) kvm_flush_remote_tlbs(kvm); } -void kvm_mmu_remove_one_alloc_mmu_page(struct kvm *kvm) +static void kvm_mmu_remove_one_alloc_mmu_page(struct kvm *kvm) { struct kvm_mmu_page *page; @@ -1968,6 +1991,8 @@ static int mmu_shrink(int nr_to_scan, gfp_t gfp_mask) list_for_each_entry(kvm, &vm_list, vm_list) { int npages; + if (!down_read_trylock(&kvm->slots_lock)) + continue; spin_lock(&kvm->mmu_lock); npages = kvm->arch.n_alloc_mmu_pages - kvm->arch.n_free_mmu_pages; @@ -1980,6 +2005,7 @@ static int mmu_shrink(int nr_to_scan, gfp_t gfp_mask) nr_to_scan--; spin_unlock(&kvm->mmu_lock); + up_read(&kvm->slots_lock); } if (kvm_freed) list_move_tail(&kvm_freed->vm_list, &vm_list); |