2016-08-15 15:00-0300, Eduardo Habkost:
> On Mon, Aug 15, 2016 at 07:50:59PM +0200, Radim Krčmář wrote:
> [...]
>> +static void kvm_clear_invalid_cpuid(struct kvm_vcpu *vcpu)
>> +{
>> + struct kvm *kvm = vcpu->kvm;
>> + struct kvm_cpuid_entry2 *best;
>> +
>> + if (!kvm->clear_invalid_cpuid)
>> + return;
>> +
>> + best = kvm_find_cpuid_entry(vcpu, 1, 0);
>> + if (best && !lapic_in_kernel(vcpu))
>> + best->ecx &= ~F(X2APIC);
>
> Isn't it possible to implement x2apic support in userspace APIC
> using the current KVM interfaces?
No, MSR accesses never get to userspace. We'll probably implement it in
the future as there already has been a proposal for unhandled MSRs.
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