[libvirt] [PATCH v2] qemu: Do not reattach PCI device used by other domain when shutdown

[Eric Blake]

On 10/17/2011 04:44 AM, Osier Yang wrote:
> After thinking a while, even we set the used_by during domains reloading,
> the other attrs (dev->unbind_from_stub, dev->reprobe, dev->remove_slot)
> of the PCI dev still will be lost. We can't known what values should be
> for these attrs as generally they are initialized when do preparation,
> however the preparations are already passed, and the devices are using
> by the running domains. And thus the device won't be bound to the
> original driver (if it had) correctly, or mistakenly bound to some driver
> but it didn't have one.
>
> Perhaps we need some new XMLs introduced for hostdevs.

You're right - the only sane way to survive libvirtd restarts is to 
track more information in the domain xml (it can be internal xml, and 
doesn't have to be dumped to the user; compare how we track <actual> as 
an internal-only detail on how networks were actually allocated). 
Sounds like we've got more work to do in this area.

-- 
Eric Blake   eblake at redhat.com    +1-801-349-2682
Libvirt virtualization library http://libvirt.org