Re: [Qemu-devel] Re: Hitting 29 NIC limit

[Wei Xu <wexu2@cisco.com>]

Isaku,

Could you explain more on irq routing in dsdt and related code in qemu? I
encountered a problem: emulated user networking (-net nic -net user) cannot
work in my qemu-kvm+q35+pcie code. Your original q35 (pure qemu) works fine.

Thanks!
Wei


On 11/17/10 7:09 PM, "Isaku Yamahata" <yamahata@valinux.co.jp> wrote:

> 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
>>