Re: [Qemu-devel] Hitting 29 NIC limit

[Anjali Kulkarni <anjali@juniper.net>]

Thanks. Does this work for e1000 as well?
Also, does it support pci hotplug?

Anjali

On 10/14/10 3:09 PM, "Anthony Liguori" <anthony@codemonkey.ws> wrote:

> 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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>>>      
>>    
>