linux-kernel - Re: [PATCH v3 09/14] virt: sev-guest: Choose the VMPCK key based on executing VMPL

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Date: Mon, 15 Apr 2024 21:54:46 -0700
From: Dan Williams <dan.j.williams@...el.com>
To: Tom Lendacky <thomas.lendacky@....com>, <linux-kernel@...r.kernel.org>,
	<x86@...nel.org>, <linux-coco@...ts.linux.dev>, <svsm-devel@...onut-svsm.dev>
CC: Thomas Gleixner <tglx@...utronix.de>, Ingo Molnar <mingo@...hat.com>,
	Borislav Petkov <bp@...en8.de>, Dave Hansen <dave.hansen@...ux.intel.com>,
	"H. Peter Anvin" <hpa@...or.com>, Andy Lutomirski <luto@...nel.org>, "Peter
 Zijlstra" <peterz@...radead.org>, Dan Williams <dan.j.williams@...el.com>,
	Michael Roth <michael.roth@....com>, Ashish Kalra <ashish.kalra@....com>
Subject: Re: [PATCH v3 09/14] virt: sev-guest: Choose the VMPCK key based on
 executing VMPL

Hey, Tom, came looking to review the tsm_report changes and noticed
this...

Tom Lendacky wrote:
> Currently, the sev-guest driver uses the vmpck-0 key by default. When an
> SVSM is present the kernel is running at a VMPL other than 0 and the
> vmpck-0 key is no longer available. So choose the vmpck key based on the
> active VMPL level.

The module parameter is not mentioned in the changelog. Is it not
sufficient to always use snp_get_vmpl(), and if not should there be some
documentation about when to specify vmpck_id?

Do users know that "vmpl" and "vmpck_id" are interchangeable?