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

[Manali Shukla <manali.shukla@amd.com>]

On 6/4/2024 3:47 AM, Sean Christopherson wrote:
> 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 :-)

Sent. 

https://lore.kernel.org/kvm/20240605050835.30491-1-manali.shukla@amd.com/T/#u

-Manali