[PATCH 3/3] selftests/powerpc: Add VF recovery tests

[Oliver O'Halloran]

On Tue, Nov 24, 2020 at 9:14 PM Frederic Barrat <fbarrat at linux.ibm.com> wrote:
>
> Is it possible to run those tests on pseries? I haven't managed to set
> up a LPAR with a physical function which would let me enable a virtual
> function. All I could do is assign a virtual function to a LPAR. When
> assigning a physical function to the LPAR, enabling a virtual function
> fails because of missing properties in the device tree, so it looks like
> the hypervisor doesn't support it (?).
>
> Same story on qemu.
>
>    Fred

IIRC having the guest manage SR-IOV was a half-baked feature that
never made it into a production phyp build. I never managed to get any
real documentation from the phyp folks about how it worked either. As
far as I can tell it's pretty similar to what we do on PowerNV with
the PE configuration being handled by h-call rather than OPAL call.
The main difference would be in how EEH freezes are handled and I know
there's *something* going on there, but I never really understood it
due to the lack of documentation.

I've been tempted to rip out all that crap a few times, but never
really got around to it. There was also some noises about implementing
support for guest managed SRIOV in pseries qemu, but I'm not sure what
ever happened to that.

Oliver