[Xen-users] Using pciback to dynamically bind/unbind primary display driver: lost console, help

[Ben Himberg <bhimberg@xxxxxxxxx>]

On Debain 3.1.0-rc7, Radeon 6870 and Xen 4.1 (no patches)

I used

echo -n 0000:01:00.0 > /sys/bus/pci/drivers/radeon/unbind
echo -n 0000:01:00.0 > /sys/bus/pci/drivers/pciback/new_slot
echo -n 0000:01:00.0 > /sys/bus/pci/drivers/pciback/bind

to move my primary display adapter (01:00.0) to pciback for domU use.  The display, as expected, turned off.  I had enabled ssh to do this, and have access to the system still.  I then used

echo -n 0000:01:00.0 > /sys/bus/pci/drivers/pciback/unbind
echo -n 0000:01:00.0 > /sys/bus/pci/drivers/radeon/bind

to pass it back to dom0 at which point the display turned back on.  Thinking all was well, I made a script to do the above and executed it (with a sleep of 10 seconds after the first bind) at which point I lost the display, as expected, but it didn't come back.  I then logged in through ssh and find that the radeon driver is bound to 01:00.0, but still no display.

I think I need to tell the console to output to the radeon driver, but I have no idea how and a google search is proving fruitless.  Any help?  I've also noticed that unbinding/binding the radeon driver is now (it wasn't initially) very slow to respond.

Thanks!
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