On 08/12/2012 04:12 PM, Gleb Natapov wrote:
> MSR_IA32_DEBUGCTLMSR is zeroed on VMEXIT. Restore it to the correct
> value.
>
> @@ -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();
How expensive is this? We may want a follow-on patch to cache it in a
per-cpu variable.
--
error compiling committee.c: too many arguments to function
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