[openstack-dev] [nova] pci device hotplug

yongli he yongli.he at intel.com
Fri Feb 28 05:08:44 UTC 2014


On 2014年02月22日 07:52, yunhong jiang wrote:
> On Mon, 2014-02-17 at 06:43 +0000, Gouzongmei wrote:
>> Hello,
>>
>>   
>>
>> In current PCI passthrough implementation, a pci device is only
>> allowed to be assigned to a instance while the instance is being
>> created, it is not allowed to be assigned or removed from the instance
>> while the instance is running or stop.
>>
>> Besides, I noticed that the basic ability--remove a pci device from
>> the instance(not by delete the flavor) has never been implemented or
>> prompted by anyone.
>>
>> The current implementation:
>>
>> https://wiki.openstack.org/wiki/Pci_passthrough
>>
>>   
>>
>> I have tested the nic hotplug on my experimental environment, it’s
>> supported by the latest libvirt and qemu.
>>
>>   
>>
>> My problem is, why the pci device hotplug is not proposed in openstack
>> until now, and is there anyone planning to do the pci device hotplug?
> Agree that PCI hotplug is an important feature. The reason of no support
> yet is bandwidth. The folks working on PCI spend a lot of time on SR-IOV
> NIC discussion.
>
> --jyh
sorry for later notice this,  sure i also think it should have hotplug .

--Yongli He
>
>
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