support for live migration with PCI passthrough devices

[Michal Privoznik]

On 8/25/20 1:40 PM, Henry lol wrote:
> Hi guys,
> 
> I'm wondering whether libvirt supports live migration for the VM with 
> PCI passthrough devices.
> or it must be assumed before live migration that all passthrough devices 
> be unplugged?

Unfortunately, this is still not supported. The problem is that PCI 
devices themselves are not capable of dumping their internal state and 
restoring from it on destination.

There is a long thread started last month that discuss what the 
interface should look like, but at this point I guess we are still far 
away from it:

https://www.redhat.com/archives/libvir-list/2020-July/msg00675.html

> 
> If so, all unplugged devices should be manually hot-plugged to the VM 
> after migration??

This is the usual mode of operation, yes.

Michal