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

Jürgen Groß
2025-03-10T15:33:11Z

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On 10.03.25 16:11, Borislav Petkov wrote:
> 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?

Kind of.

/sys/hypervisor is meant to provide data for running under a hypervisor.

It is NOT meant to provide data for running as a hypervisor.

So far when running either under Xen or under z/VM /sys/hypervisor is being
populated.

I'm not feeling really strong here. I just want to state the status quo.

Juergen

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