linux-kernel - Re: [PATCH v5 08/13] KVM: selftests: Test Intel PMU architectural events on gp counters

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Message-ID: <ZTgwWBp9BiEdWcqT@google.com>
Date:   Tue, 24 Oct 2023 14:00:08 -0700
From:   Sean Christopherson <seanjc@...gle.com>
To:     Paolo Bonzini <pbonzini@...hat.com>, kvm@...r.kernel.org,
        linux-kernel@...r.kernel.org,
        Jinrong Liang <cloudliang@...cent.com>,
        Like Xu <likexu@...cent.com>
Subject: Re: [PATCH v5 08/13] KVM: selftests: Test Intel PMU architectural
 events on gp counters

On Tue, Oct 24, 2023, Sean Christopherson wrote:
> On Mon, Oct 23, 2023, Sean Christopherson wrote:
> > +static void test_intel_arch_events(void)
> > +{
> > +	uint8_t idx, i, j;
> > +
> > +	for (idx = 0; idx < NR_INTEL_ARCH_EVENTS; idx++) {

*sigh*

Yet another KVM bug that this test _should_ catch, but doesn't because too many
things are hardcoded.  KVM _still_ advertises Top Down Slots to userspace because
KVM doesn't sanitize the bit vector or its length that comes out of perf.