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

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Message-ID: <Z9AFyG7798M4VNJQ@suse.de>
Date: Tue, 11 Mar 2025 10:43:36 +0100
From: Joerg Roedel <jroedel@...e.de>
To: Alexey Gladkov <legion@...nel.org>
Cc: Jürgen Groß <jgross@...e.com>,
	Borislav Petkov <bp@...en8.de>, 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>, 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 04:43:59PM +0100, Alexey Gladkov wrote:
> If in the /sys/hypervisor we have information for guest (for running under
> a hypervisor), where do you propose to put the information for the
> host-side (for running as a hypervisor) ?

Okay, so let's not mix things up too much here. The only (upstream) case
where Linux _is_ the hypervisor is when running KVM guests. What
information needs to be provided for this case in SYSFS that is not
already provided elsewhere, e.g. by the KVM modules or, in case of SEV,
by /dev/sev? What does Intel expose for TDX?

Back to the guest-side, I agree with introducing a new directory in
SYSFS with sub-directories for each detected hypervisor. To maximise
confusion, it can be called '/sys/hypervisors/', or just /sys/guest/ (as
Boris suggested).

Regards,

-- 
Jörg Rödel
jroedel@...e.de

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