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

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Message-ID: <20250310151154.GOZ88BOinZVkbYEx0w@fat_crate.local>
Date: Mon, 10 Mar 2025 16:11:54 +0100
From: Borislav Petkov <bp@...en8.de>
To: Alexey Gladkov <legion@...nel.org>
Cc: Juergen Gross <jgross@...e.com>, Joerg Roedel <joro@...tes.org>,
	"Alexey Gladkov (Intel)" <alexey.gladkov@...el.com>,
	"Kirill A. Shutemov" <kirill.shutemov@...ux.intel.com>,
	Dave Hansen <dave.hansen@...el.com>, Joerg Roedel <jroedel@...e.de>,
	Ingo Molnar <mingo@...nel.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
Subject: Re: [PATCH] x86/sev: Make SEV_STATUS available via SYSFS

On Mon, Mar 10, 2025 at 03:50:09PM +0100, Alexey Gladkov wrote:
> Am I understand correctly that you and Joerg are proposing
> 
> /sys/guest/tdx/...
> /sys/guest/sev/...
> 
> ?
> 
> Which path to use for the host side ?
> 
> For guest: /sys/coco/guest/{tdx,sev}/...
> For host:  /sys/coco/host/{tdx,sev}/...
> 
> Maybe it would be better to add the "coco" subdirectory or something like
> that ?

Hmm, so we can do

/sys/guest

and extend

/sys/hypervisor

Or we can do what you're suggesting.

If we do /sys/coco/host, then we'll have two different places to read HV info.

Or we can stick *everything* coco needs in

/sys/coco/{sev,tdx}

but then it is coco-specific and if other guest types want to put stuff in
sysfs, it'll get ugly.

So I guess having

/sys/guest
and
/sys/hypervisor

kinda keeps it all clean, hierarchy-wise...

Right?

-- 
Regards/Gruss,
    Boris.

https://people.kernel.org/tglx/notes-about-netiquette