KVM: MMU: audit: check whether have unsync sps after root sync

[cascardo/linux.git] / arch / x86 / kvm / mmu_audit.c

diff --git a/arch/x86/kvm/mmu_audit.c b/arch/x86/kvm/mmu_audit.c
index 66219af..4aee32c 100644 (file)
--- a/arch/x86/kvm/mmu_audit.c
+++ b/arch/x86/kvm/mmu_audit.c
@@ -164,6 +164,14 @@ static void audit_sptes_have_rmaps(struct kvm_vcpu *vcpu, u64 *sptep, int level)
                inspect_spte_has_rmap(vcpu->kvm, sptep);
 }
 
+static void audit_spte_after_sync(struct kvm_vcpu *vcpu, u64 *sptep, int level)
+{
+       struct kvm_mmu_page *sp = page_header(__pa(sptep));
+
+       if (audit_point == AUDIT_POST_SYNC && sp->unsync)
+               audit_printk("meet unsync sp(%p) after sync root.\n", sp);
+}
+
 static void check_mappings_rmap(struct kvm *kvm, struct kvm_mmu_page *sp)
 {
        int i;
@@ -179,7 +187,7 @@ static void check_mappings_rmap(struct kvm *kvm, struct kvm_mmu_page *sp)
        }
 }
 
-void audit_write_protection(struct kvm *kvm, struct kvm_mmu_page *sp)
+static void audit_write_protection(struct kvm *kvm, struct kvm_mmu_page *sp)
 {
        struct kvm_memory_slot *slot;
        unsigned long *rmapp;
@@ -215,6 +223,7 @@ static void audit_spte(struct kvm_vcpu *vcpu, u64 *sptep, int level)
 {
        audit_sptes_have_rmaps(vcpu, sptep, level);
        audit_mappings(vcpu, sptep, level);
+       audit_spte_after_sync(vcpu, sptep, level);
 }
 
 static void audit_vcpu_spte(struct kvm_vcpu *vcpu)