KVM: nSVM: do not mark all VMCB01 fields dirty on nested vmexit

Since L1 and L2 now use different VMCBs, most of the fields remain
the same from one L1 run to the next.  svm_set_cr0 and other functions
called by nested_svm_vmexit already take care of clearing the
corresponding clean bits; only the TSC offset is special.

Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>

diff --git a/arch/x86/kvm/svm/nested.c b/arch/x86/kvm/svm/nested.c
index f88d0614d9b85f9a0a9ac29a0e9143f02cbdf174..4fc742ba1f1f1fa7557799b33e3cc9383165f1c1 100644 (file)
--- a/arch/x86/kvm/svm/nested.c
+++ b/arch/x86/kvm/svm/nested.c
@@ -698,8 +698,11 @@ int nested_svm_vmexit(struct vcpu_svm *svm)
        svm_set_gif(svm, false);
        svm->vmcb->control.exit_int_info = 0;
 
-       svm->vmcb->control.tsc_offset = svm->vcpu.arch.tsc_offset =
-               svm->vcpu.arch.l1_tsc_offset;
+       svm->vcpu.arch.tsc_offset = svm->vcpu.arch.l1_tsc_offset;
+       if (svm->vmcb->control.tsc_offset != svm->vcpu.arch.tsc_offset) {
+               svm->vmcb->control.tsc_offset = svm->vcpu.arch.tsc_offset;
+               vmcb_mark_dirty(svm->vmcb, VMCB_INTERCEPTS);
+       }
 
        svm->nested.ctl.nested_cr3 = 0;
 
@@ -717,8 +720,6 @@ int nested_svm_vmexit(struct vcpu_svm *svm)
        svm->vcpu.arch.dr7 = DR7_FIXED_1;
        kvm_update_dr7(&svm->vcpu);
 
-       vmcb_mark_all_dirty(svm->vmcb);
-
        trace_kvm_nested_vmexit_inject(vmcb12->control.exit_code,
                                       vmcb12->control.exit_info_1,
                                       vmcb12->control.exit_info_2,