linux-kernel - Re: [PATCH v4 5/8] x86/bugs: KVM: Move VM_CLEAR_CPU_BUFFERS into SVM as SVM_CLEAR_CPU

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Message-ID: <DDWIETE937VA.1JV3X655CGIFC@google.com>
Date: Fri, 31 Oct 2025 12:34:29 +0000
From: Brendan Jackman <jackmanb@...gle.com>
To: Sean Christopherson <seanjc@...gle.com>, Paolo Bonzini <pbonzini@...hat.com>, 
	Thomas Gleixner <tglx@...utronix.de>, Borislav Petkov <bp@...en8.de>, 
	Peter Zijlstra <peterz@...radead.org>, Josh Poimboeuf <jpoimboe@...nel.org>
Cc: <kvm@...r.kernel.org>, <linux-kernel@...r.kernel.org>, 
	Pawan Gupta <pawan.kumar.gupta@...ux.intel.com>, Brendan Jackman <jackmanb@...gle.com>
Subject: Re: [PATCH v4 5/8] x86/bugs: KVM: Move VM_CLEAR_CPU_BUFFERS into SVM
 as SVM_CLEAR_CPU_BUFFERS

On Fri Oct 31, 2025 at 12:30 AM UTC, Sean Christopherson wrote:
> Now that VMX encodes its own sequency for clearing CPU buffers, move
> VM_CLEAR_CPU_BUFFERS into SVM to minimize the chances of KVM botching a
> mitigation in the future, e.g. using VM_CLEAR_CPU_BUFFERS instead of
> checking multiple mitigation flags.
>
> No functional change intended.
>
> Signed-off-by: Sean Christopherson <seanjc@...gle.com>

Reviewed-by: Brendan Jackman <jackmanb@...gle.com>