linux-kernel - Re: [PATCH v3 4/4] KVM: selftests: Test gp event filters don't affect fixed event filters

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Date:   Wed, 28 Jun 2023 14:30:37 -0700
From:   Sean Christopherson <seanjc@...gle.com>
To:     Jinrong Liang <ljr.kernel@...il.com>
Cc:     Paolo Bonzini <pbonzini@...hat.com>,
        Jim Mattson <jmattson@...gle.com>,
        Shuah Khan <shuah@...nel.org>,
        Aaron Lewis <aaronlewis@...gle.com>,
        David Matlack <dmatlack@...gle.com>,
        Vishal Annapurve <vannapurve@...gle.com>,
        Wanpeng Li <wanpengli@...cent.com>,
        Like Xu <like.xu.linux@...il.com>,
        Jinrong Liang <cloudliang@...cent.com>,
        linux-kselftest@...r.kernel.org, kvm@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH v3 4/4] KVM: selftests: Test gp event filters don't affect
 fixed event filters

On Wed, Jun 07, 2023, Jinrong Liang wrote:
>  static void __test_fixed_counter_bitmap(struct kvm_vcpu *vcpu, uint8_t idx,
>  					uint8_t nr_fixed_counters)
>  {
> @@ -881,6 +894,25 @@ static void __test_fixed_counter_bitmap(struct kvm_vcpu *vcpu, uint8_t idx,
>  						       bitmap);
>  		TEST_ASSERT(!!count == !(bitmap & BIT(idx)),
>  			    "Fixed event filter does not work as expected.");
> +
> +		/*
> +		 * Check that setting both events[] and fixed_counter_bitmap
> +		 * does not affect the consistency of the fixed ctrs' behaviour.

Spell out "counters".  And this isn't about "consistency", the fixed_counter_bitmap
should straight up win, i.e.

		/*
		 * Check that fixed_counter_bitmap has higher priority than
		 * events[] when both are set.
		 */