linux-kernel - Re: [PATCH 0/5] KVM: selftests: Fix PMC checks in PMU counters test

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Message-ID: <CABgObfYuSn225d+Voc=T9am8zUK63v+s3GamohPU2+k0KwERkw@mail.gmail.com>
Date: Mon, 20 Jan 2025 17:17:47 +0100
From: Paolo Bonzini <pbonzini@...hat.com>
To: Sean Christopherson <seanjc@...gle.com>
Cc: kvm@...r.kernel.org, linux-kernel@...r.kernel.org, 
	kernel test robot <oliver.sang@...el.com>
Subject: Re: [PATCH 0/5] KVM: selftests: Fix PMC checks in PMU counters test

On Sat, Jan 18, 2025 at 12:42 AM Sean Christopherson <seanjc@...gle.com> wrote:
>
> Fix a flaw in the Intel PMU counters test where it asserts that an event is
> counting correctly without actually knowing what the event counts given the
> underlying hardware.
>
> The bug manifests as failures with the Top-Down Slots architectural event
> when running CPUs that doesn't actually support that arch event (pre-ICX).
> The arch event encoding still counts _something_, just not Top-Down Slots
> (I haven't bothered to look up what it was counting).  The passed by sheer
> dumb luck until an unrelated change caused the count of the unknown event
> to drop.

Queued for 6.14-rc1, thanks.

Paolo