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Subject: Re: [virtio-comment] [PATCH 1/3] shared memory: Define shared memory regions

On Fri, 15 Feb 2019 11:19:09 +0000
"Dr. David Alan Gilbert" <dgilbert@redhat.com> wrote:

> What I'm missing here is why the behaviour of the s390's traditional channel program
> matters to the design of an entirely emulated device.

I mostly wrote this up as an explanation...

> As long as the s390 allows:
>   a) The host to map a region of HVA into GPA at an arbitrary GPA
> address
>   b) Not tell the guest that (a) is RAM
>   c) Find a non-RAM GPA for (a)

I think (b) and (c) are what we need to come up with a solution for...
DavidH's idea looks like a good starting point for that.

>   d) Allow the guest to set up a page table pointing to (c)
>   e) Discover (c) via the scheme you described
> Then that's all that's needed - and I'm not seeing what is different on
> s390 about a-d from any other architecture.
> Dave
> --
> Dr. David Alan Gilbert / dgilbert@redhat.com / Manchester, UK

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