Re: [PATCH v2 0/2] KVM: arm64: Support for Arm v8.8 memcpy instructions in KVM guests

[Oliver Upton]

On Thu, Sep 28, 2023 at 05:55:39PM +0100, Kristina Martsenko wrote:

[...]

> > Perhaps I'm being pedantic, but I'd really like for there to be some
> > documentation that suggests MOPS exceptions can happen due to context
> > migration done by a higher EL as that is the only option in the context
> > of virtualization.
> 
> That's a good point. This shouldn't affect Linux guests as Linux is
> always able to handle a MOPS exception coming from EL0. But it would
> affect any non-Linux guest that pins all its EL0 tasks and doesn't
> implement a handler. It's not clear to me what the expectation for
> guests is, I'll ask the architects to clarify and get back to you.

That'd be excellent, thanks! All I'm looking for is something to point
folks at if/when they complain about MOPS behavior in KVM guests.

-- 
Thanks,
Oliver