Re: [Qemu-devel] Hitting 29 NIC limit

[Anthony Liguori <anthony@codemonkey.ws>]

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"<anthony@codemonkey.ws>  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:
>>
>> anthony@howler:~$ 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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>>      
>