[libvirt] [PATCH v2 09/11] qemu: don't mess with non mandatory hostdevs on reattaching

[Nikolay Shirokovskiy]

On 16.09.2019 11:30, Peter Krempa wrote:
> On Mon, Sep 09, 2019 at 14:33:12 +0300, Nikolay Shirokovskiy wrote:
>> First I don't want to add code to handle dummy device that is used when
>> host usb device is not present at the moment of starting/migrating etc.
>> Second supporting non mandatory policies would require to handle races
>> when host usb device is plugged to host and libvirtd starts adding
>> device but if in the meanwhile host usb device it unplugged back then
>> current code will use dummy device which is not desired in this case.
> 
> I don't think that handling startupPolicy for cases other than VM
> startup makes semantic sense. Could you elaborate what's the goal? I
> didn't quite get it from the commit message.
> 

We have different states for device that was missing on start
and device that was unplugged. In the former case we have stub
device in qemu (bus=0, device=0) while in the latter case we don't
have any correnspondent device in qemu. So I don't want add extra
logic to handle the first case on re-plug.

Nikolay