diff --git a/arch/x86/kvm/mmu.c b/arch/x86/kvm/mmu.c index 25d3bb2543e22e..ba119dae890ebf 100644 --- a/arch/x86/kvm/mmu.c +++ b/arch/x86/kvm/mmu.c @@ -1170,26 +1170,6 @@ static int mmu_unsync_walk(struct kvm_mmu_page *sp, return __mmu_unsync_walk(sp, pvec); } -static struct kvm_mmu_page *kvm_mmu_lookup_page(struct kvm *kvm, gfn_t gfn) -{ - unsigned index; - struct hlist_head *bucket; - struct kvm_mmu_page *sp; - struct hlist_node *node; - - pgprintk("%s: looking for gfn %lx\n", __func__, gfn); - index = kvm_page_table_hashfn(gfn); - bucket = &kvm->arch.mmu_page_hash[index]; - hlist_for_each_entry(sp, node, bucket, hash_link) - if (sp->gfn == gfn && !sp->role.direct - && !sp->role.invalid) { - pgprintk("%s: found role %x\n", - __func__, sp->role.word); - return sp; - } - return NULL; -} - static void kvm_unlink_unsync_page(struct kvm *kvm, struct kvm_mmu_page *sp) { WARN_ON(!sp->unsync); @@ -1759,47 +1739,61 @@ u8 kvm_get_guest_memory_type(struct kvm_vcpu *vcpu, gfn_t gfn) } EXPORT_SYMBOL_GPL(kvm_get_guest_memory_type); -static int kvm_unsync_page(struct kvm_vcpu *vcpu, struct kvm_mmu_page *sp) +static void __kvm_unsync_page(struct kvm_vcpu *vcpu, struct kvm_mmu_page *sp) +{ + trace_kvm_mmu_unsync_page(sp); + ++vcpu->kvm->stat.mmu_unsync; + sp->unsync = 1; + + kvm_mmu_mark_parents_unsync(sp); + mmu_convert_notrap(sp); +} + +static void kvm_unsync_pages(struct kvm_vcpu *vcpu, gfn_t gfn) { - unsigned index; struct hlist_head *bucket; struct kvm_mmu_page *s; struct hlist_node *node, *n; + unsigned index; - index = kvm_page_table_hashfn(sp->gfn); + index = kvm_page_table_hashfn(gfn); bucket = &vcpu->kvm->arch.mmu_page_hash[index]; - /* don't unsync if pagetable is shadowed with multiple roles */ + hlist_for_each_entry_safe(s, node, n, bucket, hash_link) { - if (s->gfn != sp->gfn || s->role.direct) + if (s->gfn != gfn || s->role.direct || s->unsync || + s->role.invalid) continue; - if (s->role.word != sp->role.word) - return 1; + WARN_ON(s->role.level != PT_PAGE_TABLE_LEVEL); + __kvm_unsync_page(vcpu, s); } - trace_kvm_mmu_unsync_page(sp); - ++vcpu->kvm->stat.mmu_unsync; - sp->unsync = 1; - - kvm_mmu_mark_parents_unsync(sp); - - mmu_convert_notrap(sp); - return 0; } static int mmu_need_write_protect(struct kvm_vcpu *vcpu, gfn_t gfn, bool can_unsync) { - struct kvm_mmu_page *shadow; + unsigned index; + struct hlist_head *bucket; + struct kvm_mmu_page *s; + struct hlist_node *node, *n; + bool need_unsync = false; + + index = kvm_page_table_hashfn(gfn); + bucket = &vcpu->kvm->arch.mmu_page_hash[index]; + hlist_for_each_entry_safe(s, node, n, bucket, hash_link) { + if (s->gfn != gfn || s->role.direct || s->role.invalid) + continue; - shadow = kvm_mmu_lookup_page(vcpu->kvm, gfn); - if (shadow) { - if (shadow->role.level != PT_PAGE_TABLE_LEVEL) + if (s->role.level != PT_PAGE_TABLE_LEVEL) return 1; - if (shadow->unsync) - return 0; - if (can_unsync && oos_shadow) - return kvm_unsync_page(vcpu, shadow); - return 1; + + if (!need_unsync && !s->unsync) { + if (!can_unsync || !oos_shadow) + return 1; + need_unsync = true; + } } + if (need_unsync) + kvm_unsync_pages(vcpu, gfn); return 0; }