Re: [PATCH v2 07/21] KVM: x86/pmu: Zero out LBR capabilities during PMU refresh

[Sean Christopherson]

On Wed, Feb 15, 2023, Like Xu wrote:
> On 10/2/2023 8:31 am, Sean Christopherson wrote:
> > Note, this is a very theoretical bug, there is no known use case where a
> > VMM would deliberately enable the vPMU via KVM_SET_CPUID2, and then later
> > disable the vPMU.
> 
> That's why we're getting more and more comfortable with selftests
> and fuzz testing on KVM interfaces. So is there a test for this ?

Yep, last patch in the series, "KVM: selftests: Verify LBRs are disabled if vPMU
is disabled".