[RFC PATCH 2/2] qemu: Add support for max physical address size

[Daniel P. Berrangé]

On Mon, Nov 02, 2020 at 09:14:22AM +0100, Christian Ehrhardt wrote:
> On Thu, Oct 29, 2020 at 5:07 PM Dario Faggioli <dfaggioli at suse.com> wrote:
> 
> > This patch maps /domain/cpu/maxphysaddr into -cpu parameters:
> >
> >   - <maxphysaddr mode='passthrough'/> becomes host-phys-bits=on
> >   - <maxphysaddr mode='emualte' bits='42'/> becomes phys-bits=42
> >
> 
> I can't thank you enough Dario for starting this,
> I have waited for this quite a while and never found the time for it myself
> :-/
> 
> Looking at my todo notes I wondered if while touching it we should right
> away also
> add host-phys-bits-limit in the same spot?
> See https://git.qemu.org/?p=qemu.git;a=commit;h=258fe08bd341d

I'm not convinced we actally need it in libvirt. Assuming we report the
host phys bits in the capabilities XML, apps can already achieve this
functionality with the mode=emulate bits=NN settings  by populating NN
based on the capabilities XML.


Regards,
Daniel
-- 
|: https://berrange.com      -o-    https://www.flickr.com/photos/dberrange :|
|: https://libvirt.org         -o-            https://fstop138.berrange.com :|
|: https://entangle-photo.org    -o-    https://www.instagram.com/dberrange :|