# Re: \[PATCH RESEND\] perf/x86/kvm: Add Cascade Lake Xeon steppings to isolation\_ucodes\[\]

- From: Andi Kleen \<hidden\>
- Date: 2021-02-05 21:10:02 
- List: kvm
- Page: https://ratatoskr.run/kvm/2021/02/6260372
- Thread: https://ratatoskr.run/kvm/2021/02/6260220/t.md

```text
On Fri, Feb 05, 2021 at 11:13:24AM -0800, Jim Mattson wrote:
> Cascade Lake Xeon parts have the same model number as Skylake Xeon
> parts, so they are tagged with the intel_pebs_isolation
> quirk. However, as with Skylake Xeon H0 stepping parts, the PEBS
> isolation issue is fixed in all microcode versions.
> 
> Add the Cascade Lake Xeon steppings (5, 6, and 7) to the
> isolation_ucodes[] table so that these parts benefit from Andi's
> optimization in commit 9b545c04abd4f ("perf/x86/kvm: Avoid unnecessary
> work in guest filtering").

Reviewed-by: Andi Kleen <redacted>

-Andi
```