linux-kernel - Re: [PATCH v4 1/8] x86/bugs: Use VM_CLEAR_CPU

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Message-ID: <20251107185941.GSaQ5BnYzN_X9J3Qa0@fat_crate.local>
Date: Fri, 7 Nov 2025 19:59:41 +0100
From: Borislav Petkov <bp@...en8.de>
To: Sean Christopherson <seanjc@...gle.com>
Cc: Paolo Bonzini <pbonzini@...hat.com>,
	Thomas Gleixner <tglx@...utronix.de>,
	Peter Zijlstra <peterz@...radead.org>,
	Josh Poimboeuf <jpoimboe@...nel.org>, 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 1/8] x86/bugs: Use VM_CLEAR_CPU_BUFFERS in VMX as well

On Thu, Oct 30, 2025 at 05:30:33PM -0700, Sean Christopherson wrote:
> From: Pawan Gupta <pawan.kumar.gupta@...ux.intel.com>
> 
> TSA mitigation:
> 
>   d8010d4ba43e ("x86/bugs: Add a Transient Scheduler Attacks mitigation")
> 
> introduced VM_CLEAR_CPU_BUFFERS for guests on AMD CPUs. Currently on Intel
> CLEAR_CPU_BUFFERS is being used for guests which has a much broader scope
> (kernel->user also).
> 
> Make mitigations on Intel consistent with TSA. This would help handling the

"consistent" as in "use the VM-specific buffer clearing variant in VMX too"?

In any case:

Acked-by: Borislav Petkov (AMD) <bp@...en8.de>

-- 
Regards/Gruss,
    Boris.

https://people.kernel.org/tglx/notes-about-netiquette