linux-kernel - Re: [PATCH 2/2] x86/sev: Make SEV

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Message-ID: <Z9GjTBHBqXenCWYx@suse.de>
Date: Wed, 12 Mar 2025 16:07:56 +0100
From: Joerg Roedel <jroedel@...e.de>
To: Dave Hansen <dave.hansen@...el.com>
Cc: Joerg Roedel <joro@...tes.org>, x86@...nel.org, hpa@...or.com,
	Tom Lendacky <thomas.lendacky@....com>,
	Nikunj A Dadhania <nikunj@....com>, Larry.Dewey@....com,
	linux-kernel@...r.kernel.org, linux-coco@...ts.linux.dev,
	Juergen Gross <jgross@...e.com>, kirill.shutemov@...ux.intel.com,
	alexey.gladkov@...el.com
Subject: Re: [PATCH 2/2] x86/sev: Make SEV_STATUS available via SYSFS

Hi Dave,

On Wed, Mar 12, 2025 at 07:57:31AM -0700, Dave Hansen wrote:
> Do we really want to just plumb the raw MSR out to userspace? Users
> would still need to parse the thing, so it's not _really_ human readable.

I agree that this is not really human readable. On the other side SYSFS
is more an interface targeted for tools than optimized for human
readability (see the one-datum-per-file rule).

The actual use-case (and the reason for these patches) of the sev_status
file is to provide a better and more secure interface than /dev/msr to a
tool named snpguest.

A human readable form of this can be added as well, if needed. There is
already a line in dmesg with the decoded features.

Regards,

-- 
Jörg Rödel
jroedel@...e.de

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