linux-kernel - Re: [PATCH 1/2] KVM: x86/pmu: Reset perf_capabilities in vcpu to 0 if PDCM is disabled

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Date: Mon, 29 Jan 2024 15:40:28 +0100
From: Paolo Bonzini <pbonzini@...hat.com>
To: Mingwei Zhang <mizhang@...gle.com>,
 Sean Christopherson <seanjc@...gle.com>, Frederick Mayle
 <fmayle@...gle.com>, Steven Moreland <smoreland@...gle.com>
Cc: Aaron Lewis <aaronlewis@...gle.com>, "H. Peter Anvin" <hpa@...or.com>,
 kvm@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 1/2] KVM: x86/pmu: Reset perf_capabilities in vcpu to 0 if
 PDCM is disabled

On 1/26/24 20:30, Mingwei Zhang wrote:
>> Hrm, I don't hate it as a stopgap.  But if we are the only people that are affected,
>> because again I'm pretty sure QEMU is fine, I would rather we just fix things in
>> our VMM and/or internal kernel.
> It is not just QEMU. crossvm is another open source VMM that suffers
> from this one.

Can you explain the symptoms in both Google's internal VMM and crosvm?

Thanks,

Paolo