Xen users - Jan 2012 - pci-passthrough NIC works as expected @ PV DomU -- until shutdown/restart. then, 'device not available'. Dom0 restart required. ??

i have a xen 4.1.2/linux64 Guest running on a xen 4.1.2/linux64 host.

i''ve passed through a PCI ethernet NIC to the Guest.

at 1st DomU startup after Dom0 boot, the card appears in lspci and can
be ifconfig''d successfully.  the card functions as expected.

if i shutdown, then restart, the Guest, the card STILL appears in lspci,
but any attempt to init the card with ifconfig etc fails, with "Device
not available" or similar messages.

if i reboot the Dom0, then all''s well again @ the DomU -- until i,
again, shutdown/restart.  then, same problem.

how might i go about finding/fixing this problem?

i know i''ll need to provide info here ... as i don''t know,
yet, what
info is pertinent, i thought i''d ask first ...

happy to provide any/all info i can.

thanks.

dch

On Wed, Jan 11, 2012, at 11:10 AM, dch8758@eml.cc wrote:
> if i reboot the Dom0, then all''s well again @ the DomU -- until i,
> again, shutdown/restart.  then, same problem.
apparently, after a shutdown of the DomU with the passedthrough pci NIC,
if I REstart ''xend'' service at Dom0, and THEN start the DomU,
the card
is fully accessible/functional in the DomU.

so, either a Dom0 reboot, or just a xend service restart, work to cure.

i doubt having to restart xend is normal behavior.  is there some
additional step or config i need to add to the DomU shutdown/restart to
avoid this problem?