[PATCH v3 0/8] x86, KVM: Optimize SEV cache flushing

[Sean Christopherson]

On Thu, 22 May 2025 16:37:24 -0700, Sean Christopherson wrote:
> This is the combination of Kevin's WBNOINVD series[1] with Zheyun's targeted
> flushing series[2].  The combined goal is to use WBNOINVD instead of WBINVD
> when doing cached maintenance to prevent data corruption due to C-bit aliasing,
> and to reduce the number of cache invalidations by only performing flushes on
> CPUs that have entered the relevant VM since the last cache flush.
> 
> All of the non-KVM patches are frontloaded and based on v6.15-rc7, so that
> they can go through the tip tree (in a stable branch, please :-) ).
> 
> [...]

Applied 5-8 to kvm-x86 sev (which is built on tip/x86_core_for_kvm).

[5/8] KVM: x86: Use wbinvd_on_cpu() instead of an open-coded equivalent
      https://github.com/kvm-x86/linux/commit/55aed8c2dbc4
[6/8] KVM: SVM: Remove wbinvd in sev_vm_destroy()
      https://github.com/kvm-x86/linux/commit/7e00013bd339
[7/8] KVM: SEV: Prefer WBNOINVD over WBINVD for cache maintenance efficiency
      https://github.com/kvm-x86/linux/commit/a77896eea33d
[8/8] KVM: SVM: Flush cache only on CPUs running SEV guest
      https://github.com/kvm-x86/linux/commit/d6581b6f2e26

--
https://github.com/kvm-x86/linux/tree/next