Re: [PATCH] KVM: selftest: Add family and model check for zen4 in PMU filter test

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On Tue, May 28, 2024, Manali Shukla wrote:
> On 5/1/2024 9:02 PM, Sean Christopherson wrote:
> > On Wed, May 01, 2024, Manali Shukla wrote:
> >> PMU event filter test fails on zen4 architecture because of
> >> unavailability of family and model check for zen4 in use_amd_pmu().
> >> So, add family and model check for zen4 architecture in use_amd_pmu().
> > 
> > Is there a less ugly way to detect that 0xc2,0 == "branch instructions retired"?
> > E.g. can we instead check for v2 PMU support, or are there no guarantees going
> > forward?  Pivoting on FMS is so painful :-(
> 
> We have confirmed with the hardware team that 0xc2,0 == "branch instructions retired"
> is always true going forward, we intend to maintain backward compatibility for branch
> instruction retired. Since event 0xc2 is supported on all currently released F17h+ 
> processors as branch instructions retired, we can check for "family >= 0x17" for all
> Zen and its successors instead of checking them individually in pmu_event_filter_test.c.

Can you send a patch for this?  Please :-)




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