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

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Message-ID: <d9a1a460-2982-429c-b29d-cf2483e9380a@suse.com>
Date: Wed, 5 Mar 2025 12:35:56 +0100
From: Juergen Gross <jgross@...e.com>
To: Borislav Petkov <bp@...en8.de>, Ingo Molnar <mingo@...nel.org>
Cc: Joerg Roedel <joro@...tes.org>, x86@...nel.org, hpa@...or.com,
 Tom Lendacky <thomas.lendacky@....com>, Nikunj A Dadhania <nikunj@....com>,
 linux-kernel@...r.kernel.org, Larry.Dewey@....com,
 Joerg Roedel <jroedel@...e.de>
Subject: Re: [PATCH] x86/sev: Make SEV_STATUS available via SYSFS

On 05.03.25 12:31, Borislav Petkov wrote:
> On Wed, Mar 05, 2025 at 12:26:13PM +0100, Ingo Molnar wrote:
>> It's *far* better to expose this via a targeted sysfs entry than
>> polluting /proc/cpuinfo with it that everyone and their dog is parsing
>> all the time ...
> 
> Pasting what we're talking on IRC:
> 
> - we don't want to expose a naked MSR u64 to userspace. Might as well use
>    msr-tools
> 
> - the backstory is, there are a bunch of tools which wanna know this so we
>    need to agree on how to supply it to them
> 
> - I think /proc/cpuinfo is the best option right now
> 
> - and then TDX can use the same thing too
> 
> - we have a general need to expose what a confidential guest supports
> 
> - a .../sev sysfs file clearly doesn't cut it because TDX doesn't have "sev"
>    - it is the Intel version of a confidential guest
> 
> - and I don't want to have "0xdeadbeef" in some sys file but "SEV SEV-ES TDX
>    SecureTSC" and so on user-readable strings

There is /sys/hypervisor/

Why don't put it there? Maybe under /sys/hypervisor/coco.


Juergen

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