KVM: SVM: Add clean-bit for control registers

This patch implements the CRx clean-bit for the vmcb. This
bit covers cr0, cr3, cr4, and efer.

Signed-off-by: Joerg Roedel <joerg.roedel@amd.com>
Signed-off-by: Avi Kivity <avi@redhat.com>

1 files changed, 7 insertions, 0 deletions

diff --git a/arch/x86/kvm/svm.c b/arch/x86/kvm/svm.c
index 5038201d6f3d..0f55b8a69540 100644
--- a/arch/x86/kvm/svm.c
+++ b/arch/x86/kvm/svm.c
@@ -192,6 +192,7 @@ enum {
         VMCB_ASID,       /* ASID */
         VMCB_INTR,       /* int_ctl, int_vector */
         VMCB_NPT,        /* npt_en, nCR3, gPAT */
+        VMCB_CR,         /* CR0, CR3, CR4, EFER */
         VMCB_DIRTY_MAX,
 };
 
@@ -441,6 +442,7 @@ static void svm_set_efer(struct kvm_vcpu *vcpu, u64 efer)
                 efer &= ~EFER_LME;
 
         to_svm(vcpu)->vmcb->save.efer = efer | EFER_SVME;
+        mark_dirty(to_svm(vcpu)->vmcb, VMCB_CR);
 }
 
 static int is_external_interrupt(u32 info)
@@ -1338,6 +1340,7 @@ static void update_cr0_intercept(struct vcpu_svm *svm)
                 *hcr0 = (*hcr0 & ~SVM_CR0_SELECTIVE_MASK)
                         | (gcr0 & SVM_CR0_SELECTIVE_MASK);
 
+        mark_dirty(svm->vmcb, VMCB_CR);
 
         if (gcr0 == *hcr0 && svm->vcpu.fpu_active) {
                 clr_cr_intercept(svm, INTERCEPT_CR0_READ);
@@ -1404,6 +1407,7 @@ static void svm_set_cr0(struct kvm_vcpu *vcpu, unsigned long cr0)
          */
         cr0 &= ~(X86_CR0_CD | X86_CR0_NW);
         svm->vmcb->save.cr0 = cr0;
+        mark_dirty(svm->vmcb, VMCB_CR);
         update_cr0_intercept(svm);
 }
 
@@ -1420,6 +1424,7 @@ static void svm_set_cr4(struct kvm_vcpu *vcpu, unsigned long cr4)
                 cr4 |= X86_CR4_PAE;
         cr4 |= host_cr4_mce;
         to_svm(vcpu)->vmcb->save.cr4 = cr4;
+        mark_dirty(to_svm(vcpu)->vmcb, VMCB_CR);
 }
 
 static void svm_set_segment(struct kvm_vcpu *vcpu,
@@ -3549,6 +3554,7 @@ static void svm_set_cr3(struct kvm_vcpu *vcpu, unsigned long root)
         struct vcpu_svm *svm = to_svm(vcpu);
 
         svm->vmcb->save.cr3 = root;
+        mark_dirty(svm->vmcb, VMCB_CR);
         force_new_asid(vcpu);
 }
 
@@ -3561,6 +3567,7 @@ static void set_tdp_cr3(struct kvm_vcpu *vcpu, unsigned long root)
 
         /* Also sync guest cr3 here in case we live migrate */
         svm->vmcb->save.cr3 = vcpu->arch.cr3;
+        mark_dirty(svm->vmcb, VMCB_CR);
 
         force_new_asid(vcpu);
 }