KVM: nVMX: Update vmcs12 for MSR_IA32_DEBUGCTLMSR when it's written

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KVM unconditionally intercepts WRMSR to MSR_IA32_DEBUGCTLMSR.  In the
unlikely event that L1 allows L2 to write L1's MSR_IA32_DEBUGCTLMSR, but
but saves L2's value on VM-Exit, update vmcs12 during L2's WRMSR so as
to eliminate the need to VMREAD the value from vmcs02 on nested VM-Exit.

Signed-off-by: Sean Christopherson <sean.j.christopherson@intel.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>

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Sean Christopherson 2019-05-07 09:06:37 -07:00 • committed by Paolo Bonzini

parent de70d27970

commit 699a1ac214

2 changed files with 9 additions and 3 deletions

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4

arch/x86/kvm/vmx/nested.c

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8

arch/x86/kvm/vmx/vmx.c

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