Re: [PATCH v4 0/6] KVM: x86/vPMU: Efficiency optimization by reusing last created perf_event

[Paolo Bonzini]

On 12/11/19 07:08, Like Xu wrote:
> 
> For vPMU, please review two more patches as well:
> +
> https://lore.kernel.org/kvm/20191030164418.2957-1-like.xu@xxxxxxxxxxxxxxx/
> (kvm)

If I understand this patch correctly, you are patching the CPUID values
passed to the KVM_SET_CPUID2 ioctl if they are not valid for the host.
Generally we don't do that, if there is garbage in CPUID the behavior of
the guest will be unreliable.

Paolo