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[Qemu-devel] Re: Hitting 29 NIC limit
From: |
Michael S. Tsirkin |
Subject: |
[Qemu-devel] Re: Hitting 29 NIC limit |
Date: |
Thu, 18 Nov 2010 09:15:19 +0200 |
User-agent: |
Mutt/1.5.21 (2010-09-15) |
On Thu, Nov 18, 2010 at 04:09:34PM +0900, Isaku Yamahata wrote:
> On Thu, Nov 18, 2010 at 08:46:43AM +0200, Michael S. Tsirkin wrote:
> > > 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.
> >
> > IMHO, what we really need is a way to specify bridges
> > through qdev. Not a machine with a hard-coded buses.
>
> Yes, it's long-term goal.
>
>
> > The firmware paths used by Gleb's code might supply
> > a good syntax to specify topology.
> >
> > > - 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
> >
> > Interesting. What's the motivation for this?
>
> For hot-plugging pci-to-pci bridge. It requires sparse pci bus numbering.
Not sure I understand. pci bus numbering should be
completely up to the guest.
> In fact, it's not so strong requirement.
> Possibly I would have to dig into dsdt.
Yes, some guest-side technology like acpi might be needed.
> --
> yamahata