Re: [Qemu-devel] Hitting 29 NIC limit

[Anthony Liguori]

On 10/14/2010 05:00 PM, Anjali Kulkarni wrote:
> Can you send me pointers to the qdev documentation? How can I use it? Will
> it allow us to scale above the 32 PCI limit?
>    

It's all below.  You just have to create a PCI device and mark the 
multifunction flag to on and then assign it a PCI address that includes 
a function number.  Then you can pack 8 virtio PCI devices into a single 
slot.

Regards,

Anthony Liguori

> Anjali
>
>
> On 10/14/10 2:57 PM, "Anthony Liguori"<address@hidden>  wrote:
>
>    
> > On 10/14/2010 04:42 PM, Richard W.M. Jones wrote:
> >      
> > > On Thu, Oct 14, 2010 at 01:10:47PM +0100, Daniel P. Berrange wrote:
> > >
> > >        
> > > > Or a PCI bridge to wire up more PCI buses, so we raise the max limit for
> > > > any type of device we emulate.
> > > >
> > > >          
> > > Break the 29/30/31 virtio-blk limit ... please!
> > >
> > >        
> > It was broken ages ago:
> >
> > address@hidden:~$ wc -l /proc/partitions; tail /proc/partitions
> > 422 /proc/partitions
> >    251     1618          1 vdcx2
> >    251     1621     489951 vdcx5
> >    251     1632   10485760 vdcy
> >    251     1633    9992398 vdcy1
> >    251     1634          1 vdcy2
> >    251     1637     489951 vdcy5
> >    251     1648   10485760 vdcz
> >    251     1649    9992398 vdcz1
> >    251     1650          1 vdcz2
> >    251     1653     489951 vdcz5
> >
> > This is what makes qdev so useful.
> >
> > args=""
> > for slot in 5 6 7 8 9 10 11 12 13 14 15 16 17; do
> > for fn in 0 1 2 3 4 5 6 7; do
> >       args="$args -drive
> > file=/home/anthony/images/linux.img,if=none,snapshot=on,id=disk${slot}_${fn}"
> >       args="$args -device
> > virtio-blk-pci,addr=${slot}.${fn},drive=disk${slot}_${fn},multifunction=on"
> > done
> > done
> >
> > x86_64-softmmu/qemu-system-x86_64 -hda ~/images/linux.img ${args}
> > -enable-kvm -serial stdio
> >
> > Regards,
> >
> > Anthony Liguori
> >
> >      
> > > Rich.
> > >
> > >
> > >        
> > --
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> >      
>