[libvirt] [PATCH 4/4] qemu: support live change of all netdev hostside config

[Laine Stump]

On 10/12/2012 05:58 AM, Laine Stump wrote:
> This is the final patch to resolve:
>
>   https://bugzilla.redhat.com/show_bug.cgi?id=805071
>
> This patch finalizes support live change of any/all hostside config of
> a network device as part of the public virDomainUpdateDeviceFlags
> API. The changes are done without detaching the device from the guest,
> so hopefully disruptions are kept to a minimum.
>
> Two new functions are created for the task -
> qemuDomainDetachNetHostSide() and qemuDomainAttachHostSide() - which
> detach and reattach just the host side of a network device, while
> leaving the PCI device on the guest side still attached. Calling these
> two functions in sequence allows us to completely change the host side
> of the device, including type of tap device, where the tap is
> connected, bandwidth/vlan/virtualport settings, etc.

Bah. This appears to not work properly. I sent mail to qemu-devel asking
for clarification/help:

  http://lists.nongnu.org/archive/html/qemu-devel/2012-10/msg02355.html

So in the meantime I guess I need to pursue the "reattach the same tap
device to a new bridge" idea as far as it will go, and save this patch
for later :-(