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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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