Re: [PATCH v5 1/3] KVM: x86: Provide per VM capability for disabling PMU virtualization

[Like Xu]

cc LKML and full list of KVM reviewers.

On 25/1/2022 2:39 am, Jim Mattson wrote:
> On Sun, Jan 23, 2022 at 10:45 AM David Dunn <daviddunn@xxxxxxxxxx> wrote:
> > KVM_CAP_PMU_DISABLE is used to disable PMU virtualization on individual
> > x86 VMs.  PMU configuration must be done prior to creating VCPUs.
> >
> > To enable future extension, KVM_CAP_PMU_CAPABILITY reports available
> > settings via bitmask when queried via check_extension.
> >
> > For VMs that have PMU virtualization disabled, usermode will need to
> > clear CPUID leaf 0xA to notify guests.
> >
> > Signed-off-by: David Dunn <daviddunn@xxxxxxxxxx>
>
> Nit: The two references to CPUID leaf 0xA should be qualified as
> applying only to Intel VMs.
>
> Reviewed-by: Jim Mattson <jmattson@xxxxxxxxxx>

Nit: It looks like we already have "#define KVM_CAP_SYS_ATTRIBUTES 209".

Hope it helps a little:

Reviewed-by: Like Xu <likexu@xxxxxxxxxxx>