[Qemu-devel] Re: Hitting 29 NIC limit

[Isaku Yamahata <yamahata@valinux.co.jp>]

Right now, qemu is internally ready to handle pci-to-pci bridge emulators
and it's quite easy to add a new simple p2p bridge emulator.
Just a single function to initialize vid/did and a single PCIDevinceInfo.

But it's difficult to use multi pci buses at the moment
because other part isn't ready. It's only for developers
who are interested in this area.

BTW, how many pci buses/slots/functions do you want at most?


What we have in the upstream repository is
- various fixes for p2p bridge support
- the library for p2p bridge support
- pcie root/upstream/downstream port emulators which is p2p bridges
  ioh3420/xio3130_upstream/xio3130_downstream

What is missing for multiple pci buses is
- a new PC machine description which has multiple pci buses
  My Q35 chipset patch will provide this.
- a simple P2P bridge emulator for pc architecture
- seabios support
  - DSDT for a new machine which has multi pci buses(IRQ routing)
  - pv pci bus numbering
    this isn't a must, I suppose
  I have those patches locally.

thanks,

On Wed, Nov 17, 2010 at 12:58:43PM +0200, Michael S. Tsirkin wrote:
> On Tue, Nov 16, 2010 at 11:20:52AM -0800, Anjali Kulkarni wrote:
> > Hi,
> > 
> > Can you elaborate what you mean by bridge support? I would really like to go
> > to 256 interfaces.
> > 
> > Anjali
> 
> Isaku Yamahata wrote most of it, I'll let him comment.
> 
> -- 
> MST
> 

-- 
yamahata