linux-kernel - Re: [PATCH 0/2] "nosnp" sev command line support

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Message-ID: <12829169-2484-8e98-c489-570dade578bd@amd.com>
Date: Thu, 1 Aug 2024 17:23:29 -0500
From: "Paluri, PavanKumar" <papaluri@....com>
To: Matthew Wilcox <willy@...radead.org>
Cc: linux-kernel@...r.kernel.org, linux-doc@...r.kernel.org,
 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>,
 Tom Lendacky <thomas.lendacky@....com>, Ashish Kalra <ashish.kalra@....com>,
 Michael Roth <michael.roth@....com>, "H . Peter Anvin" <hpa@...or.com>,
 Peter Zijlstra <peterz@...radead.org>, "Giani, Dhaval" <Dhaval.Giani@....com>
Subject: Re: [PATCH 0/2] "nosnp" sev command line support

Hi Matthew,

On 8/1/2024 3:58 PM, Matthew Wilcox wrote:
> On Thu, Aug 01, 2024 at 03:56:36PM -0500, Pavan Kumar Paluri wrote:
>> Provide "nosnp" boot option via "sev=nosnp" kernel command line to
>> prevent SNP-capable host kernel from enabling SEV-SNP and initializing
>> RMP table.
> 
> Congratulations on using three acronyms multiple times and defining none
> of them.

I apologize for not defining the acronyms, I had wrongly assumed they
were well understood by the reviewers/maintainers. I can fix that up
going forward. In the meantime:

RMP: Reverse Map Table
SEV: Secure Encrypted Virtualization
SNP: Secure Nested Paging

These definitions are also available in AMD-APM vol 2: Chapter 15 [1]

[1]:
https://www.amd.com/content/dam/amd/en/documents/processor-tech-docs/programmer-references/24593.pdf

Thanks,
Pavan