From mboxrd@z Thu Jan  1 00:00:00 1970
From: Gleb Natapov <gleb@redhat.com>
Subject: Re: Configuration vs. compat hints [was Re: [Qemu-devel] [PATCHv3
	03/13] qemu: add routines to manage PCI capabilities]
Date: Mon, 15 Jun 2009 14:14:15 +0300
Message-ID: <20090615111415.GO19508@redhat.com>
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Cc: Avi Kivity <avi@redhat.com>, Mark McLoughlin <markmc@redhat.com>,
	Anthony Liguori <anthony@codemonkey.ws>,
	Jamie Lokier <jamie@shareable.org>,
	Carsten Otte <cotte@de.ibm.com>, kvm@vger.kernel.org,
	Glauber Costa <glommer@redhat.com>,
	Rusty Russell <rusty@rustcorp.com.au>, qemu-devel@nongnu.org,
	virtualization@lists.linux-foundation.org,
	Blue Swirl <blauwirbel@gmail.com>,
	Christian Borntraeger <borntraeger@de.ibm.com>,
	Paul Brook <paul@codesourcery.com>
To: "Michael S. Tsirkin" <mst@redhat.com>
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On Mon, Jun 15, 2009 at 02:07:53PM +0300, Michael S. Tsirkin wrote:
> On Mon, Jun 15, 2009 at 01:52:13PM +0300, Gleb Natapov wrote:
> > On Mon, Jun 15, 2009 at 01:46:53PM +0300, Michael S. Tsirkin wrote:
> > > On Mon, Jun 15, 2009 at 01:44:56PM +0300, Gleb Natapov wrote:
> > > > On Mon, Jun 15, 2009 at 01:32:49PM +0300, Michael S. Tsirkin wrote:
> > > > > > You do need to export available slot numbers from qemu.
> > > > > 
> > > > > Why would a slot be unavailable?
> > > > > 
> > > > Because it does not exist?
> > > 
> > > We can create a slot with any number, can't we?
> > What do you mean? If the mobo has 4 slots you can't create fifth.
> > KVM describes 32 slots in the BIOS.
> 
> Do you mean the KVM kernel module here? I don't know much about the
No I don't mean KVM kernel module here.

> BIOS. Can't qemu control the number of slots declared?
> 
Qemu represents HW, BIOS drives this HW. They should be in sync on such
important issues like pci slot configuration. Even if QEMU can control
the number of slots declared (which it can't easily do), it will be able
to do it only on startup (before BIOS runs). The way to have dynamic
number of slots may be pci bridge emulation. Not sure what is needed
from BIOS for that.

--
			Gleb.