[PATCH 1/5] powerpc/pseries: do not use msgsndp doorbells on POWER9 guests

[Michael Ellerman]

Nicholas Piggin <npiggin at gmail.com> writes:

> POWER9 hypervisors will not necessarily run guest threads together on
> the same core at the same time, so msgsndp should not be used.

I'm worried this is encoding the behaviour of a particular hypervisor in
the guest kernel.

If we *can't* use msgsndp then the hypervisor better do something to
stop us from using it.

If it would be preferable for us not to use msgsndp, then the hypervisor
can tell us that somehow, eg. in the device tree.

?

cheers