Re: [PATCH] x86/sev: Make SEV_STATUS available via SYSFS

Alexey Gladkov
2025-03-11T18:13:51Z

On Tue, Mar 11, 2025 at 10:43:36AM +0100, Joerg Roedel wrote:
> 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?

Right now tdx does not export any information to userspace (neither
host-side nor guest-side). I want to change that. I want to export
version, attributes and features, maybe something else.

> 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@suse.de
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