@@ -113,6 +113,7 @@
#define VALID_PAGE(x) ((x) != INVALID_PAGE)
#define UNMAPPED_GVA (~(gpa_t)0)
+#define INVALID_GPA (~(gpa_t)0)
/* KVM Hugepage definitions for x86 */
#define KVM_MAX_HUGEPAGE_LEVEL PG_LEVEL_1G
@@ -872,6 +872,15 @@ void svm_free_nested(struct vcpu_svm *svm)
__free_page(virt_to_page(svm->nested.vmcb02.ptr));
svm->nested.vmcb02.ptr = NULL;
+ /*
+ * When last_vmcb12_gpa matches the current vmcb12 gpa,
+ * some vmcb12 fields are not loaded if they are marked clean
+ * in the vmcb12, since in this case they are up to date already.
+ *
+ * When the vmcb02 is freed, this optimization becomes invalid.
+ */
+ svm->nested.last_vmcb12_gpa = INVALID_GPA;
+
svm->nested.initialized = false;
}
@@ -884,6 +893,8 @@ void svm_leave_nested(struct vcpu_svm *svm)
if (is_guest_mode(vcpu)) {
svm->nested.nested_run_pending = 0;
+ svm->nested.vmcb12_gpa = INVALID_GPA;
+
leave_guest_mode(vcpu);
svm_switch_vmcb(svm, &svm->vmcb01);
@@ -1235,8 +1235,8 @@ static void init_vmcb(struct kvm_vcpu *vcpu)
svm->current_vmcb->asid_generation = 0;
svm->asid = 0;
- svm->nested.vmcb12_gpa = 0;
- svm->nested.last_vmcb12_gpa = 0;
+ svm->nested.vmcb12_gpa = INVALID_GPA;
+ svm->nested.last_vmcb12_gpa = INVALID_GPA;
vcpu->arch.hflags = 0;
if (!kvm_pause_in_guest(vcpu->kvm)) {
* Define and use an invalid GPA (all ones) for init value of last and current nested vmcb physical addresses. * Reset the current vmcb12 gpa to the invalid value when leaving the nested mode, similar to what is done on nested vmexit. * Reset the last seen vmcb12 address when disabling the nested SVM, as it relies on vmcb02 fields which are freed at that point. Fixes: 4995a3685f1b ("KVM: SVM: Use a separate vmcb for the nested L2 guest") Signed-off-by: Maxim Levitsky <mlevitsk@redhat.com> --- arch/x86/include/asm/kvm_host.h | 1 + arch/x86/kvm/svm/nested.c | 11 +++++++++++ arch/x86/kvm/svm/svm.c | 4 ++-- 3 files changed, 14 insertions(+), 2 deletions(-)