diff options
| author | Gleb Natapov <gleb@redhat.com> | 2012-08-12 16:12:29 +0300 |
|---|---|---|
| committer | Marcelo Tosatti <mtosatti@redhat.com> | 2012-08-13 19:07:58 -0300 |
| commit | 2a7921b7a033d5cfc176690d6297c82846c582b2 (patch) | |
| tree | afa0d8381230b60492dc0a8f27ebc01f0eb0f0a8 | |
| parent | 6024f1a4dd066d54213cc17f821e19e3062298ca (diff) | |
KVM: VMX: restore MSR_IA32_DEBUGCTLMSR after VMEXIT
MSR_IA32_DEBUGCTLMSR is zeroed on VMEXIT. Restore it to the correct
value.
Signed-off-by: Gleb Natapov <gleb@redhat.com>
Signed-off-by: Marcelo Tosatti <mtosatti@redhat.com>
| -rw-r--r-- | arch/x86/kvm/vmx.c | 6 |
1 files changed, 6 insertions, 0 deletions
diff --git a/arch/x86/kvm/vmx.c b/arch/x86/kvm/vmx.c index cc8ad9836927..d0f4bec9fc62 100644 --- a/arch/x86/kvm/vmx.c +++ b/arch/x86/kvm/vmx.c @@ -6222,6 +6222,7 @@ static void atomic_switch_perf_msrs(struct vcpu_vmx *vmx) static void __noclone vmx_vcpu_run(struct kvm_vcpu *vcpu) { struct vcpu_vmx *vmx = to_vmx(vcpu); + unsigned long debugctlmsr; if (is_guest_mode(vcpu) && !vmx->nested.nested_run_pending) { struct vmcs12 *vmcs12 = get_vmcs12(vcpu); @@ -6261,6 +6262,7 @@ static void __noclone vmx_vcpu_run(struct kvm_vcpu *vcpu) vmx_set_interrupt_shadow(vcpu, 0); atomic_switch_perf_msrs(vmx); + debugctlmsr = get_debugctlmsr(); vmx->__launched = vmx->loaded_vmcs->launched; asm( @@ -6362,6 +6364,10 @@ static void __noclone vmx_vcpu_run(struct kvm_vcpu *vcpu) #endif ); + /* MSR_IA32_DEBUGCTLMSR is zeroed on vmexit. Restore it if needed */ + if (debugctlmsr) + update_debugctlmsr(debugctlmsr); + #ifndef CONFIG_X86_64 /* * The sysexit path does not restore ds/es, so we must set them to |