linux-kernel - Re: [RFC PATCH 3/9] KVM: x86: Add a kvm-only leaf for BHI

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Message-ID: <20221214213707.GC16072@ranerica-svr.sc.intel.com>
Date:   Wed, 14 Dec 2022 13:37:07 -0800
From:   Ricardo Neri <ricardo.neri-calderon@...ux.intel.com>
To:     Zhang Chen <chen.zhang@...el.com>
Cc:     x86@...nel.org, linux-kernel@...r.kernel.org, kvm@...r.kernel.org,
        Chao Gao <chao.gao@...el.com>,
        Pawan Gupta <pawan.kumar.gupta@...ux.intel.com>,
        Paolo Bonzini <pbonzini@...hat.com>,
        Sean Christopherson <seanjc@...gle.com>,
        "H. Peter Anvin" <hpa@...or.com>,
        Dave Hansen <dave.hansen@...ux.intel.com>,
        Borislav Petkov <bp@...en8.de>, Ingo Molnar <mingo@...hat.com>,
        Thomas Gleixner <tglx@...utronix.de>
Subject: Re: [RFC PATCH 3/9] KVM: x86: Add a kvm-only leaf for BHI_CTRL

On Sun, Dec 11, 2022 at 12:00:40AM +0800, Zhang Chen wrote:
> KVM needs to check if guests can see BHI_CTRL. If a guest is using
> BHB-clearing sequence and cannot see BHI_CTRL and the host enumerates BHI,
> KVM is responsible for setting BHI_DIS_S for the guest.
> 
> This allows VM migration from parts doesn't enumerate BHI to those
> that enumerate BHI.

Similar comment as in patch 2.