[Xen-users] PCI passthrough of a SATA/PATA controller, "FLR functionality not supported"

[Daniel Brockmann <meszi@xxxxxxxxxxx>]

Hi there,

I have a question regarding PCI passthrough on the Citrix XenServer 5.6 
(Xen 3.4.2).
I already managed to get some soundcard passed through to a Windows 
guest. So I think my knowledge about that topic isn't _that_ low. But I 
cannot seem to pass through a SATA/PATA controller to a Linux guest.
I have some additional CD/DVD burner (PATA) attached to a SATA/PATA 
controller card and I want to pass through the controller to enable the 
Linux guest to burn CDs - previous attempts to pass the XenServer host's 
burner (/dev/xvdb) haven't been successful and therefore I chose to try 
this strategy.
When not having the controller card plugged in the "lspci -tv" command 
shows this:
-0000:00-+-00.0 Intel Corporation 4 Series Chipset DRAM Controller
+-02.0 Intel Corporation 4 Series Chipset Integrated Graphics Controller
+-02.1 Intel Corporation 4 Series Chipset Integrated Graphics Controller
+-03.0 Intel Corporation 4 Series Chipset HECI Controller
+-03.2 Intel Corporation 4 Series Chipset PT IDER Controller
+-03.3 Intel Corporation 4 Series Chipset Serial KT Controller
+-19.0 Intel Corporation 82567LM-3 Gigabit Network Connection
+-1a.0 Intel Corporation 82801JD/DO (ICH10 Family) USB UHCI Controller #4
+-1a.1 Intel Corporation 82801JD/DO (ICH10 Family) USB UHCI Controller #5
+-1a.2 Intel Corporation 82801JD/DO (ICH10 Family) USB UHCI Controller #6
+-1a.7 Intel Corporation 82801JD/DO (ICH10 Family) USB2 EHCI Controller #2
+-1d.0 Intel Corporation 82801JD/DO (ICH10 Family) USB UHCI Controller #1
+-1d.1 Intel Corporation 82801JD/DO (ICH10 Family) USB UHCI Controller #2
+-1d.2 Intel Corporation 82801JD/DO (ICH10 Family) USB UHCI Controller #3
+-1d.7 Intel Corporation 82801JD/DO (ICH10 Family) USB2 EHCI Controller #1
+-1e.0-0000:01----01.0 Agere Systems FW322/323
+-1f.0 Intel Corporation 82801JDO (ICH10DO) LPC Interface Controller
+-1f.2 Intel Corporation 82801JD/DO (ICH10 Family) 4-port SATA IDE 
Controller
+-1f.3 Intel Corporation 82801JD/DO (ICH10 Family) SMBus Controller
\-1f.5 Intel Corporation 82801JD/DO (ICH10 Family) 2-port SATA IDE 
Controller
When having the SATA/PATA controller card plugged in I get almost the 
same output but with these additional entries:
[...]
+-1c.0-0000:01--
+-1c.3-0000:02--+-00.0 JMicron Technology Corp. JMB362/JMB363 Serial ATA 
Controller
                        | \-00.1 JMicron Technology Corp. JMB362/JMB363 
Serial ATA Controller
[...]

Therefore I decided to pass-through everything that appeared 
additionally after the mount of the controller card:
xe vm-param-set 
other-config:pci=0/0000:00:1c.0,1/0000:00:1c.3,2/0000:02:00.0,3/0000:02:00.1 
uuid=e5c4dcf3-e93f-8da3-27c5-217cd33baf59
When starting the Linux guest Dom0's messages log shows this:

[...]
Feb 20 13:21:32 localhost kernel: pciback 0000:00:1c.0: seizing device
Feb 20 13:23:12 localhost kernel: pciback 0000:02:00.1: seizing device
Feb 20 13:23:12 localhost kernel: pciback 0000:02:00.1: PCI INT B -> GSI 
16 (level, low) -> IRQ 16
Feb 20 13:23:12 localhost kernel: pciback 0000:02:00.1: PCI INT B disabled
Feb 20 13:23:12 localhost kernel: pciback 0000:02:00.1: secondary bus 
reset failed for device - all functions need to be co-assigned - err: 6
Feb 20 13:23:12 localhost kernel: pciback 0000:02:00.1: FLR 
functionality not supported; attempts to use secondary bus reset 
unsuccessful;
Feb 20 13:23:12 localhost kernel: pciback 0000:02:00.1: FLR not 
performed for device
Feb 20 13:23:12 localhost kernel: pciback 0000:02:00.0: seizing device
Feb 20 13:23:12 localhost kernel: pciback 0000:02:00.0: PCI INT A -> GSI 
19 (level, low) -> IRQ 19
Feb 20 13:23:12 localhost kernel: pciback 0000:02:00.0: PCI INT A disabled
Feb 20 13:23:12 localhost kernel: pciback: vpci: 0000:02:00.1: assign to 
virtual slot 0
Feb 20 13:23:13 localhost kernel: pciback: vpci: 0000:02:00.0: assign to 
virtual slot 0
Feb 20 13:23:13 localhost kernel: pciback 0000:00:1c.3: seizing device
Feb 20 13:23:13 localhost kernel: pciback: vpci: 0000:00:1c.3: assign to 
virtual slot 0
Feb 20 13:23:13 localhost kernel: pciback: vpci: 0000:00:1c.0: assign to 
virtual slot 0
[...]

As far as I understood the last five lines here show that the assignment 
to the guest went okay but I also see like "FLR functionality not 
supported". From my research I already know that this happens with 
multifunctional controllers - and mine has SATA and PATA.
At least I could see the DVD burner attached to that PATA controller 
disappearing in Citrix XenCenter's storage overview. But I cannot find 
anything that points out my Linux guest having recognized the 
passed-through controller or the connected DVD burner, too.
The first solution suggestion I found was to pass-through all "lspci" 
results that are equivalent with the multi controller ... which I did 
... with the result mentioned above.
I am not sure what silly mistake I might have done. As I said at the 
beginning ... PCI-passthrough itself worked already in some other case 
but at the moment I cannot figure out what went wrong here. I'd be glad 
if someone of you could help me with some suggestion...
Kind regards,
Daniel.


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