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Date: Tue, 14 Jul 2009 12:32:29 +0300
From: Gleb Natapov <gleb@redhat.com>
Subject: Re: [Qemu-devel] [patch 2/2] QEMU BOCHS bios patches to use
	maxcpus value.
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To: Filip Navara <filip.navara@gmail.com>
Cc: Anthony Liguori <aliguori@us.ibm.com>, Jes Sorensen <jes@sgi.com>, qemu-devel@nongnu.org, Avi Kivity <avi@redhat.com>

On Tue, Jul 14, 2009 at 11:21:53AM +0200, Filip Navara wrote:
> On Tue, Jul 14, 2009 at 10:38 AM, Jes Sorensen<jes@sgi.com> wrote:
> > On 07/09/2009 11:57 PM, Anthony Liguori wrote:
> >>
> >> These changes make my Ubuntu server guest very unhappy. =9AI get a bun=
ch
> >> of messages about "Not responding." on startup.
> >>
> >> If nothing else, maxcpus =3D=3Dsmp_cpus under QEMU because we don't do=
 CPU
> >> hotplug (and I don't think we should).
> >
> > Anthony,
> >
> > Sorry haven't gotten back to you earlier as I was on vacation. Are you
> > saying the Ubuntu kernel doesn't like having more CPU entries in the
> > ACPI table than it actually boots on?
> >
> > Does the same guest boot using an older KVM setup? Curious since it does
> > have the larger CPU table in the DSDT.
> >
> > Cheers,
> > Jes
> >
>=20
> BTW, many other guests complain when ACPI describes more processors
> than actually present in machine. That's why I implemented the dynamic
> DSDT generation in Bochs BIOS in the first place. One that comes to
> mind is MacOS X, or the Darwin kernel respectively.
>=20
There is nothing wrong in describing more processors than actually
present. The disable flag is defined by ACPI for a reason. My real HW
IBM server does this.

--
			Gleb.