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Re: [Qemu-devel] [PATCH] Correctly assign PCI domain numbers
From: |
Michael S. Tsirkin |
Subject: |
Re: [Qemu-devel] [PATCH] Correctly assign PCI domain numbers |
Date: |
Mon, 1 Aug 2011 17:03:18 +0300 |
User-agent: |
Mutt/1.5.21 (2010-09-15) |
On Mon, Aug 01, 2011 at 11:33:37PM +1000, David Gibson wrote:
> On Mon, Aug 01, 2011 at 01:10:38PM +0300, Michael S. Tsirkin wrote:
> > On Mon, Aug 01, 2011 at 04:51:02PM +1000, David Gibson wrote:
> > > qemu already almost supports PCI domains; that is, several entirely
> > > independent PCI host bridges on the same machine. However, a bug in
> > > pci_bus_new_inplace() means that every host bridge gets assigned domain
> > > number zero and so can't be properly distinguished. This patch fixes the
> > > bug, giving each new host bridge a new domain number.
> > >
> > > Signed-off-by: David Gibson <address@hidden>
> >
> > OK, but I'd like to see the whole picture.
> > How does the guest detect multiple domains,
> > and how does it access them?
>
> For the pseries machine, which is what I'm concerned with, each host
> bridge is advertised through the device tree passed to the guest.
Could you explain please?
What generates the device tree and passes it to the guest?
> That gives the necessary handles and addresses for accesing config
> space and memory and IO windows for each host bridge.
I see. I think maybe a global counter in the common code
is not exactly the best solution in the general case.
> --
> David Gibson | I'll have my music baroque, and my code
> david AT gibson.dropbear.id.au | minimalist, thank you. NOT _the_
> _other_
> | _way_ _around_!
> http://www.ozlabs.org/~dgibson
- [Qemu-devel] [PATCH] Correctly assign PCI domain numbers, David Gibson, 2011/08/01
- Re: [Qemu-devel] [PATCH] Correctly assign PCI domain numbers, Isaku Yamahata, 2011/08/01
- Re: [Qemu-devel] [PATCH] Correctly assign PCI domain numbers, Michael S. Tsirkin, 2011/08/01
- Re: [Qemu-devel] [PATCH] Correctly assign PCI domain numbers, David Gibson, 2011/08/01
- Re: [Qemu-devel] [PATCH] Correctly assign PCI domain numbers,
Michael S. Tsirkin <=
- Re: [Qemu-devel] [PATCH] Correctly assign PCI domain numbers, David Gibson, 2011/08/01
- Re: [Qemu-devel] [PATCH] Correctly assign PCI domain numbers, Michael S. Tsirkin, 2011/08/03
- Re: [Qemu-devel] [PATCH] Correctly assign PCI domain numbers, David Gibson, 2011/08/04
- Re: [Qemu-devel] [PATCH] Correctly assign PCI domain numbers, Michael S. Tsirkin, 2011/08/04
- Re: [Qemu-devel] [PATCH] Correctly assign PCI domain numbers, Michael S. Tsirkin, 2011/08/10
- Re: [Qemu-devel] [PATCH] Correctly assign PCI domain numbers, David Gibson, 2011/08/11
Re: [Qemu-devel] [Qemu-trivial] [PATCH] Correctly assign PCI domain numbers, Stefan Hajnoczi, 2011/08/03
Re: [Qemu-devel] [PATCH] Correctly assign PCI domain numbers, David Gibson, 2011/08/09