linux-kernel - Re: [PATCH v4 11/11] x86/vmscape: Add cmdline vmscape=on to override attack vector controls

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Message-ID: <150c4314-dba4-4137-914e-b1aacf69290e@suse.com>
Date: Tue, 25 Nov 2025 13:41:18 +0200
From: Nikolay Borisov <nik.borisov@...e.com>
To: Pawan Gupta <pawan.kumar.gupta@...ux.intel.com>, x86@...nel.org,
 David Kaplan <david.kaplan@....com>, "H. Peter Anvin" <hpa@...or.com>,
 Josh Poimboeuf <jpoimboe@...nel.org>, Sean Christopherson
 <seanjc@...gle.com>, Paolo Bonzini <pbonzini@...hat.com>,
 Borislav Petkov <bp@...en8.de>, Dave Hansen <dave.hansen@...ux.intel.com>
Cc: linux-kernel@...r.kernel.org, kvm@...r.kernel.org,
 Asit Mallick <asit.k.mallick@...el.com>, Tao Zhang <tao1.zhang@...el.com>
Subject: Re: [PATCH v4 11/11] x86/vmscape: Add cmdline vmscape=on to override
 attack vector controls

On 11/20/25 08:20, Pawan Gupta wrote:
> In general, individual mitigation controls can be used to override the
> attack vector controls. But, nothing exists to select BHB clearing
> mitigation for VMSCAPE. The =force option comes close, but with a
> side-effect of also forcibly setting the bug, hence deploying the
> mitigation on unaffected parts too.
> 
> Add a new cmdline option vmscape=on to enable the mitigation based on the
> VMSCAPE variant the CPU is affected by.
> 
> Signed-off-by: Pawan Gupta <pawan.kumar.gupta@...ux.intel.com>

Reviewed-by: Nikolay Borisov <nik.borisov@...e.com>