[openstack-dev] [nova][neutron] New BP for live migration with direct pci passthru

Fawad Khaliq fawad at plumgrid.com
Tue Feb 16 05:19:12 UTC 2016

On Mon, Feb 1, 2016 at 3:25 PM, Xie, Xianshan <xiexs at cn.fujitsu.com> wrote:

> Hi, all,
>   I have registered a new BP about the live migration with a direct pci
> passthru device.
>   Could you please help me to review it? Thanks in advance.

Can you please share the link?

> The following is the details:
> ----------------------------------------------------------------------------------
> SR-IOV has been supported for a long while, in the community's point of
> view,
> the pci passthru with Macvtap can be live migrated possibly, but the
> direct pci passthru
> seems hard to implement the migration as the passthru VF is totally
> controlled by
> the VMs so that some internal states may be unknown by the hypervisor.
> But we think the direct pci passthru model can also be live migrated with
> the
> following combination of a series of technology/operation based on the
> enhanced
> Qemu-Geust-Agent(QGA) which has already been supported by nova.
>    1)Bond the direct pci passthru NIC with a virtual NIC.
>      This will keep the network connectivity during the live migration.
>    2)Unenslave the direct pci passthru NIC
>    3)Hot-unplug the direct pci passthru NIC
>    4)Live-migrate guest with the virtual NIC
>    5)Hot-plug the direct pci passthru NIC on the target host
>    6)Enslave the direct pci passthru NIC
> And more inforation about this concept can refer to [1].
> [1]https://www.kernel.org/doc/ols/2008/ols2008v2-pages-261-267.pdf
> ----------------------------------------------------------------------------------
> Best regards,
> Xiexs
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