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| author | Sean Christopherson <sean.j.christopherson@intel.com> | 2019-05-07 09:06:37 -0700 |
|---|---|---|
| committer | Paolo Bonzini <pbonzini@redhat.com> | 2019-06-18 11:47:37 +0200 |
| commit | 699a1ac214328569d203b9c6bfc22903d5642dee (patch) | |
| tree | 7c2cf3f091ffed8144290c7ec9809e014532cb7d /arch/x86/kvm | |
| parent | de70d279709efb7d0b0c0dce2eb398fc43c4b7f6 (diff) | |
| download | linux-699a1ac214328569d203b9c6bfc22903d5642dee.tar.gz linux-699a1ac214328569d203b9c6bfc22903d5642dee.tar.bz2 linux-699a1ac214328569d203b9c6bfc22903d5642dee.zip | |
KVM: nVMX: Update vmcs12 for MSR_IA32_DEBUGCTLMSR when it's written
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>
Diffstat (limited to 'arch/x86/kvm')
| -rw-r--r-- | arch/x86/kvm/vmx/nested.c | 4 | ||||
| -rw-r--r-- | arch/x86/kvm/vmx/vmx.c | 8 |
2 files changed, 9 insertions, 3 deletions
diff --git a/arch/x86/kvm/vmx/nested.c b/arch/x86/kvm/vmx/nested.c index c096e803e6f0..ba7f16b37719 100644 --- a/arch/x86/kvm/vmx/nested.c +++ b/arch/x86/kvm/vmx/nested.c @@ -3563,10 +3563,8 @@ static void sync_vmcs02_to_vmcs12(struct kvm_vcpu *vcpu, struct vmcs12 *vmcs12) (vmcs12->vm_entry_controls & ~VM_ENTRY_IA32E_MODE) | (vm_entry_controls_get(to_vmx(vcpu)) & VM_ENTRY_IA32E_MODE); - if (vmcs12->vm_exit_controls & VM_EXIT_SAVE_DEBUG_CONTROLS) { + if (vmcs12->vm_exit_controls & VM_EXIT_SAVE_DEBUG_CONTROLS) kvm_get_dr(vcpu, 7, (unsigned long *)&vmcs12->guest_dr7); - vmcs12->guest_ia32_debugctl = vmcs_read64(GUEST_IA32_DEBUGCTL); - } if (vmcs12->vm_exit_controls & VM_EXIT_SAVE_IA32_EFER) vmcs12->guest_ia32_efer = vcpu->arch.efer; diff --git a/arch/x86/kvm/vmx/vmx.c b/arch/x86/kvm/vmx/vmx.c index 248fca1f0c45..6e414d698130 100644 --- a/arch/x86/kvm/vmx/vmx.c +++ b/arch/x86/kvm/vmx/vmx.c @@ -1845,6 +1845,14 @@ static int vmx_set_msr(struct kvm_vcpu *vcpu, struct msr_data *msr_info) get_vmcs12(vcpu)->guest_sysenter_esp = data; vmcs_writel(GUEST_SYSENTER_ESP, data); break; + case MSR_IA32_DEBUGCTLMSR: + if (is_guest_mode(vcpu) && get_vmcs12(vcpu)->vm_exit_controls & + VM_EXIT_SAVE_DEBUG_CONTROLS) + get_vmcs12(vcpu)->guest_ia32_debugctl = data; + + ret = kvm_set_msr_common(vcpu, msr_info); + break; + case MSR_IA32_BNDCFGS: if (!kvm_mpx_supported() || (!msr_info->host_initiated && |