linux-kernel - Re: [PATCH 6/7] KVM: x86: Ignore benign host accesses to "unsupported" PEBS and BTS MSRs

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Message-ID: <875yl3k7sy.fsf@redhat.com>
Date:   Tue, 14 Jun 2022 09:45:01 +0200
From:   Vitaly Kuznetsov <vkuznets@...hat.com>
To:     Sean Christopherson <seanjc@...gle.com>
Cc:     Wanpeng Li <wanpengli@...cent.com>,
        Jim Mattson <jmattson@...gle.com>,
        Joerg Roedel <joro@...tes.org>, kvm@...r.kernel.org,
        linux-kernel@...r.kernel.org, Like Xu <likexu@...cent.com>,
        Paolo Bonzini <pbonzini@...hat.com>
Subject: Re: [PATCH 6/7] KVM: x86: Ignore benign host accesses to
 "unsupported" PEBS and BTS MSRs

Sean Christopherson <seanjc@...gle.com> writes:

> Ignore host userspace reads and writes of '0' to PEBS and BTS MSRs that
> KVM reports in the MSR-to-save list, but the MSRs are ultimately
> unsupported.  All MSRs in said list must be writable by userspace, e.g.
> if userspace sends the list back at KVM without filtering out the MSRs it
> doesn't need.
>
> 8183a538cd95 ("KVM: x86/pmu: Add IA32_DS_AREA MSR emulation to support guest DS")
> 902caeb6841a ("KVM: x86/pmu: Add PEBS_DATA_CFG MSR emulation to support adaptive PEBS")
> c59a1f106f5c ("KVM: x86/pmu: Add IA32_PEBS_ENABLE MSR emulation for extended PEBS")

These are 'Fixes:' tags I suppose?

...

-- 
Vitaly