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

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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>
This commit is contained in:
Paolo Bonzini
2020-11-16 06:38:19 -05:00
parent 7c3ecfcd31
commit 7ca62d1322
1 changed files with 5 additions and 4 deletions
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9
arch/x86/kvm/svm/nested.c
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@@ -700,8 +700,11 @@ 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;
@@ -719,8 +722,6 @@ 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,