Re: [PATCH v2] KVM: x86/pmu: Don't retry a counter whose config was rejected

[Sean Christopherson]

On Sun, 20 Sep 2026 15:54:53 +0000, Luka Absandze wrote:
> kvm_pmu_handle_event() re-arms the reprogram bit for every failed
> reprogram, on the assumption that the failure is transient and a later
> refresh will succeed.  That is true for contention, e.g. the -EBUSY from
> x86_reserve_hardware(), but not for a configuration the host PMU driver
> rejects outright.  A rejected config can never succeed on retry, so the
> counter is reprogrammed on every PMU refresh for as long as the guest
> leaves it enabled, and every attempt fails the same way.
> 
> [...]

Applied to kvm-x86 misc, thanks!

[1/1] KVM: x86/pmu: Don't retry a counter whose config was rejected
      https://github.com/kvm-x86/linux/commit/1c24893fdb4d

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