linux-kernel - Re: [kvm-unit-tests PATCH] x86: Update guest LBR tests for Architectural LBR

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Date:   Wed, 3 Mar 2021 10:05:40 -0800
From:   Sean Christopherson <seanjc@...gle.com>
To:     Like Xu <like.xu@...ux.intel.com>
Cc:     Peter Zijlstra <peterz@...radead.org>,
        Paolo Bonzini <pbonzini@...hat.com>,
        Vitaly Kuznetsov <vkuznets@...hat.com>,
        Wanpeng Li <wanpengli@...cent.com>,
        Jim Mattson <jmattson@...gle.com>,
        Joerg Roedel <joro@...tes.org>,
        Kan Liang <kan.liang@...ux.intel.com>,
        Dave Hansen <dave.hansen@...el.com>, wei.w.wang@...el.com,
        Borislav Petkov <bp@...en8.de>, kvm@...r.kernel.org,
        x86@...nel.org, linux-kernel@...r.kernel.org
Subject: Re: [kvm-unit-tests PATCH] x86: Update guest LBR tests for
 Architectural LBR

On Wed, Mar 03, 2021, Like Xu wrote:
> This unit-test is intended to test the KVM's support for the
> Architectural LBRs which is a Architectural performance monitor
> unit (PMU) feature on Intel processors.

These really need negative testing, especially on the MSR values.  IMO, negative
tests should be mandatory for merging arch LBR support in KVM, it shouldn't be
too much additional effort.