linux-kernel - Re: [PATCH 5/5] KVM: x86/pmu: Hide guest counter updates from the VMRUN instruction

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Date:   Mon, 29 May 2023 22:36:39 +0800
From:   Like Xu <like.xu.linux@...il.com>
To:     Jim Mattson <jmattson@...gle.com>,
        Sean Christopherson <seanjc@...gle.com>
Cc:     Paolo Bonzini <pbonzini@...hat.com>,
        Ravi Bangoria <ravi.bangoria@....com>, kvm@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH 5/5] KVM: x86/pmu: Hide guest counter updates from the
 VMRUN instruction

On 25/5/2023 5:30 am, Jim Mattson wrote:
> Note that there's a bug in the original code for this that has
> probably never been fixed: it ignores CMASK and INV in the PerfEvtSel.

Regarding the emulation of CMASK, INV and PIN_CONTROL bits on vPMU,
please forgive me for never having the right expectations (so there will be no
correct emulation), an share more *architecture* descriptions of those hw
behavior, and it would be great to have corresponding selftests as a bug report.