[SeaBIOS] 1TB Guest changes to receive phys bits >=40

[Christian Ehrhardt]

Thanks,
that means it is just as I expected and I only needed the eye opener where
to look at.
Thanks Paolo and Gerd!

On Mon, Jun 11, 2018 at 3:53 PM, Paolo Bonzini <pbonzini at redhat.com> wrote:

> On 11/06/2018 15:21, Christian Ehrhardt wrote:
> > Hi,
> > I was asked about x86 Guests of >1TB in size. And while some discussions
> > where around qemu/libvirt and host-phys-bits [1] I realized that in
> > Seabios I need exactly what is already in CentOS/RHEL [2] to get the
> > phys-bits passed on.
> >
> > The change [2] itself is rather old, so I wondered if I'm missing that
> > this was implemented in a totally different way. Do I have to switch/set
> > options these days instead of using that patch?
>
> That patch is not needed anymore.  It is only there to support old
> machine types.  In newer versions of QEMU, QEMU builds the e820 memory
> map for SeaBIOS, and that is enough to support >=1TB guests nicely.
>
> Paolo
>
> > But I saw that it is still applied even to rather recent versions.
> >
> > So the question become why the change is not upstream yet?
> > Was it maybe discussed in the past and Nack'ed for some reason?
> > I didn't find the discussion if that is the case and would appreciate
> > the pointer.
> >
> > We are closing in to make 1TB more common rather quickly, so I wonder if
> > really nothing would speak against it - would it be reasonable to
> > consider committing that upstream to Seabios these days?
> >
> > [1]: https://bugs.launchpad.net/ubuntu/+source/qemu/+bug/1769053
> > [2]: https://git.centos.org/blob/rpms!seabios.git/
> 14f0fd75785bc5f1468fa84fbd3a1627f3433032/SOURCES!0002-allow-
> 1TB-of-RAM.patch
> >
> > P.S. Subscribing people acking the original patch as they might have old
> > context to provide on this.
> >
> > --
> > Christian Ehrhardt
> > Software Engineer, Ubuntu Server
> > Canonical Ltd
>
>


-- 
Christian Ehrhardt
Software Engineer, Ubuntu Server
Canonical Ltd
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