xen-pciback: drop SR-IOV VFs when PF driver unloads
authorJan Beulich <JBeulich@suse.com>
Wed, 3 Dec 2014 21:40:33 +0000 (16:40 -0500)
committerDavid Vrabel <david.vrabel@citrix.com>
Thu, 4 Dec 2014 12:42:03 +0000 (12:42 +0000)
commit6945c59c772be5edd578b12831dee3f7c8576103
treefcb7b811cf33cfe11dfdf1a334cb99b2af445ed1
parentb1df4a56bf4a61113e8928f932d346bed6eef553
xen-pciback: drop SR-IOV VFs when PF driver unloads

When a PF driver unloads, it may find it necessary to leave the VFs
around simply because of pciback having marked them as assigned to a
guest. Utilize a suitable notification to let go of the VFs, thus
allowing the PF to go back into the state it was before its driver
loaded (which in particular allows the driver to be loaded again with
it being able to create the VFs anew, but which also allows to then
pass through the PF instead of the VFs).

Don't do this however for any VFs currently in active use by a guest.

Signed-off-by: Jan Beulich <jbeulich@suse.com>
[v2: Removed the switch statement, moved it about]
[v3: Redid it a bit differently]
Signed-off-by: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>
Signed-off-by: David Vrabel <david.vrabel@citrix.com>
drivers/xen/xen-pciback/pci_stub.c