forked from Minki/linux
KVM: MMU: audit: check whether have unsync sps after root sync
After root synced, all unsync sps are synced, this patch add a check to make sure it's no unsync sps in VCPU's page table Signed-off-by: Xiao Guangrong <xiaoguangrong@cn.fujitsu.com> Signed-off-by: Avi Kivity <avi@redhat.com>
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@ -53,14 +53,18 @@ enum {
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AUDIT_PRE_PAGE_FAULT,
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AUDIT_POST_PAGE_FAULT,
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AUDIT_PRE_PTE_WRITE,
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AUDIT_POST_PTE_WRITE
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AUDIT_POST_PTE_WRITE,
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AUDIT_PRE_SYNC,
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AUDIT_POST_SYNC
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};
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char *audit_point_name[] = {
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"pre page fault",
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"post page fault",
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"pre pte write",
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"post pte write"
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"post pte write",
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"pre sync",
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"post sync"
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};
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#undef MMU_DEBUG
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@ -2516,6 +2520,8 @@ static void mmu_sync_roots(struct kvm_vcpu *vcpu)
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if (!VALID_PAGE(vcpu->arch.mmu.root_hpa))
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return;
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trace_kvm_mmu_audit(vcpu, AUDIT_PRE_SYNC);
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if (vcpu->arch.mmu.root_level == PT64_ROOT_LEVEL) {
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hpa_t root = vcpu->arch.mmu.root_hpa;
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sp = page_header(root);
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@ -2531,6 +2537,7 @@ static void mmu_sync_roots(struct kvm_vcpu *vcpu)
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mmu_sync_children(vcpu, sp);
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}
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}
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trace_kvm_mmu_audit(vcpu, AUDIT_POST_SYNC);
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}
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void kvm_mmu_sync_roots(struct kvm_vcpu *vcpu)
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@ -164,6 +164,14 @@ static void audit_sptes_have_rmaps(struct kvm_vcpu *vcpu, u64 *sptep, int level)
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inspect_spte_has_rmap(vcpu->kvm, sptep);
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}
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static void audit_spte_after_sync(struct kvm_vcpu *vcpu, u64 *sptep, int level)
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{
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struct kvm_mmu_page *sp = page_header(__pa(sptep));
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if (audit_point == AUDIT_POST_SYNC && sp->unsync)
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audit_printk("meet unsync sp(%p) after sync root.\n", sp);
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}
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static void check_mappings_rmap(struct kvm *kvm, struct kvm_mmu_page *sp)
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{
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int i;
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@ -179,7 +187,7 @@ static void check_mappings_rmap(struct kvm *kvm, struct kvm_mmu_page *sp)
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}
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}
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void audit_write_protection(struct kvm *kvm, struct kvm_mmu_page *sp)
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static void audit_write_protection(struct kvm *kvm, struct kvm_mmu_page *sp)
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{
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struct kvm_memory_slot *slot;
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unsigned long *rmapp;
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@ -215,6 +223,7 @@ static void audit_spte(struct kvm_vcpu *vcpu, u64 *sptep, int level)
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{
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audit_sptes_have_rmaps(vcpu, sptep, level);
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audit_mappings(vcpu, sptep, level);
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audit_spte_after_sync(vcpu, sptep, level);
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}
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static void audit_vcpu_spte(struct kvm_vcpu *vcpu)
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