linux-kernel - Re: [PATCH 2/2] x86 KVM:SVM: Provide "nosnp" boot option for sev kernel command line

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Message-ID: <3fbb647c-7a39-372e-c85a-a59e6a652b1a@amd.com>
Date: Fri, 2 Aug 2024 09:19:00 -0500
From: Tom Lendacky <thomas.lendacky@....com>
To: Pavan Kumar Paluri <papaluri@....com>, linux-kernel@...r.kernel.org,
 linux-doc@...r.kernel.org
Cc: Borislav Petkov <bp@...en8.de>, Thomas Gleixner <tglx@...utronix.de>,
 Ingo Molnar <mingo@...hat.com>, Dave Hansen <dave.hansen@...ux.intel.com>,
 Eric Van Tassell <Eric.VanTassell@....com>,
 Ashish Kalra <ashish.kalra@....com>, Michael Roth <michael.roth@....com>,
 Brijesh Singh <brijesh.singh@....com>, "H . Peter Anvin" <hpa@...or.com>,
 Peter Zijlstra <peterz@...radead.org>
Subject: Re: [PATCH 2/2] x86 KVM:SVM: Provide "nosnp" boot option for sev
 kernel command line

On 8/1/24 15:56, Pavan Kumar Paluri wrote:
> Provide a "nosnp" kernel command line option to prevent enabling of the
> RMP and SEV-SNP features in the host/hypervisor. Not initializing the
> RMP removes system overhead associated with RMP checks.
> 
> Co-developed-by: Eric Van Tassell <Eric.VanTassell@....com>
> Signed-off-by: Eric Van Tassell <Eric.VanTassell@....com>
> Signed-off-by: Pavan Kumar Paluri <papaluri@....com>

Reviewed-by: Tom Lendacky <thomas.lendacky@....com>

> ---
>  Documentation/arch/x86/x86_64/boot-options.rst | 3 +++
>  arch/x86/virt/svm/cmdline.c                    | 6 ++++++
>  2 files changed, 9 insertions(+)