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Subject: Re: [PATCH v4 0/6] KVM: x86/vPMU: Efficiency optimization by reusing
 last created perf_event
To:     Like Xu <like.xu@linux.intel.com>
Cc:     Peter Zijlstra <peterz@infradead.org>,
        linux-kernel@vger.kernel.org, kvm@vger.kernel.org
References: <20191027105243.34339-1-like.xu@linux.intel.com>
 <20191028164324.GJ4097@hirez.programming.kicks-ass.net>
 <dcbc78f5-c267-d5be-f4e8-deaebf91fe1f@linux.intel.com>
From:   Paolo Bonzini <pbonzini@redhat.com>
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Date:   Tue, 12 Nov 2019 11:09:15 +0100
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On 12/11/19 07:08, Like Xu wrote:
>=20
> For vPMU, please review two more patches as well:
> +
> https://lore.kernel.org/kvm/20191030164418.2957-1-like.xu@linux.intel.com=
/
> (kvm)

If I understand this patch correctly, you are patching the CPUID values
passed to the KVM_SET_CPUID2 ioctl if they are not valid for the host.
Generally we don't do that, if there is garbage in CPUID the behavior of
the guest will be unreliable.

Paolo