Re: [RFC PATCH 2/2] qemu: Add support for max physical address size
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(a)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
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