Re: [Qemu-devel] Hitting 29 NIC limit

[Anthony Liguori <anthony@codemonkey.ws>]

On 10/14/2010 05:12 PM, Anjali Kulkarni wrote:
> Thanks. Does this work for e1000 as well?
>    

Haven't tried.  I don't know how various e1000 drivers would react.

> Also, does it support pci hotplug?
>    

No, but that's fixable down the road.

Regards,

Anthony Liguori

> 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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>>>>
>>>>          
>>>
>>>        
>>      
>