Re: [PATCH v6 0/7] Introduce and test masked events

[Sean Christopherson <seanjc@google.com>]

On Fri, Oct 21, 2022, Aaron Lewis wrote:
> This series introduces the concept of masked events to the pmu event
> filter. Masked events can help reduce the number of events needed in the
> pmu event filter by allowing a more generalized matching method to be
> used for the unit mask when filtering guest events in the pmu.  With
> masked events, if an event select should be restricted from the guest,
> instead of having to add an entry to the pmu event filter for each
> event select + unit mask pair, a masked event can be added to generalize
> the unit mask values.

...

> Aaron Lewis (7):
>   kvm: x86/pmu: Correct the mask used in a pmu event filter lookup
>   kvm: x86/pmu: Remove impossible events from the pmu event filter
>   kvm: x86/pmu: prepare the pmu event filter for masked events
>   kvm: x86/pmu: Introduce masked events to the pmu event filter
>   selftests: kvm/x86: Add flags when creating a pmu event filter
>   selftests: kvm/x86: Add testing for KVM_SET_PMU_EVENT_FILTER
>   selftests: kvm/x86: Test masked events

One comment request in the last patch, but it's not the end of the world if it
doesn't get added right away.

An extra set of eyeballs from Paolo, Jim, and/or Like would be welcome as I don't
consider myself trustworthy when it comes to PMU code...

Reviewed-by: Sean Christopherson <seanjc@google.com>