linux-kernel - Re: [PATCH] KVM: x86/pmu: Disallow legacy LBRs if architectural LBRs are available

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Message-ID: <168073931597.699581.10258108748120088305.b4-ty@google.com>
Date:   Wed,  5 Apr 2023 19:11:06 -0700
From:   Sean Christopherson <seanjc@...gle.com>
To:     Sean Christopherson <seanjc@...gle.com>,
        Paolo Bonzini <pbonzini@...hat.com>
Cc:     kvm@...r.kernel.org, linux-kernel@...r.kernel.org,
        Yang Weijiang <weijiang.yang@...el.com>,
        Like Xu <like.xu.linux@...il.com>
Subject: Re: [PATCH] KVM: x86/pmu: Disallow legacy LBRs if architectural LBRs
 are available

On Sat, 28 Jan 2023 00:14:27 +0000, Sean Christopherson wrote:
> Disallow enabling LBR support if the CPU supports architectural LBRs.
> Traditional LBR support is absent on CPU models that have architectural
> LBRs, and KVM doesn't yet support arch LBRs, i.e. KVM will pass through
> non-existent MSRs if userspace enables LBRs for the guest.
> 
> 

Applied to kvm-x86 pmu, with a Fixes tag.

[1/1] KVM: x86/pmu: Disallow legacy LBRs if architectural LBRs are available
      https://github.com/kvm-x86/linux/commit/098f4c061ea1

--
https://github.com/kvm-x86/linux/tree/next
https://github.com/kvm-x86/linux/tree/fixes