[Xen-devel] RE: pci pass-through failure on xen 3.3.0

["Cui, Dexuan" <dexuan.cui@xxxxxxxxx>]

Hi Masroor,

Looks there is an incorrect assumption.

Could you please help to test the attached patch? If it doesn't work, can you attached your output of "lspci -tv" and "lspci -xxx -vvv"?

 

Thanks!

 

-- Dexuan

 

---

From: xen-devel-bounces@xxxxxxxxxxxxxxxxxxx [mailto:xen-devel-bounces@xxxxxxxxxxxxxxxxxxx] On Behalf Of Masroor Vettuparambil
Sent: 2008年10月8日 8:33
To: xen-devel@xxxxxxxxxxxxxxxxxxx
Subject: [Xen-devel] pci pass-through failure on xen 3.3.0

Hi all,

 

I downloaded the xen 3.3.0 and now testing the pci pass-through with the NIC.

Using late binding, the pci slot  0000:08:01.0 is assigned to pciback.

But pci related xm commands are not working.

 

For eg:

linux-242:/home/xen-3.3.0 # xm pci-list-assignable-devices

Unexpected error: <type 'exceptions.OSError'>

 

Please report to xen-devel@xxxxxxxxxxxxxxxxxxx

Traceback (most recent call last):

  File "/usr/sbin/xm", line 10, in <module>

    main.main(sys.argv)

  File "//usr/lib64/python/xen/xm/main.py", line 2883, in main

    _, rc = _run_cmd(cmd, cmd_name, args)

  File "//usr/lib64/python/xen/xm/main.py", line 2907, in _run_cmd

    return True, cmd(args)

  File "//usr/lib64/python/xen/xm/main.py", line 2202, in xm_pci_list_assignable_devices

    devs_list = check_FLR_capability(dev_list)

  File "/usr/lib64/python2.5/xen/util/pci.py", line 288, in check_FLR_capability

    coassigned_pci_list = dev.find_coassigned_devices(True)

  File "/usr/lib64/python2.5/xen/util/pci.py", line 461, in find_coassigned_devices

    dev = self.find_the_uppermost_pci_bridge()

  File "/usr/lib64/python2.5/xen/util/pci.py", line 424, in find_the_uppermost_pci_bridge

    dev_parent = PciDevice(dom, b, d, f)

  File "/usr/lib64/python2.5/xen/util/pci.py", line 382, in __init__

    self.detect_dev_info()

  File "/usr/lib64/python2.5/xen/util/pci.py", line 604, in detect_dev_info

    class_dev = self.pci_conf_read16(PCI_CLASS_DEVICE)

  File "/usr/lib64/python2.5/xen/util/pci.py", line 567, in pci_conf_read16

    fd = os.open(self.cfg_space_path, os.O_RDONLY)

OSError: [Errno 2] No such file or directory: '/sys/bus/pci/devices/0000:06:00.0/config'

 

I checked the above python scripts.

The function find_parent() in file util/pci.py, tries to find the parent device from the file link ../../../devices/pci0000:06/0000:06:01.0/0000:08:01.0

When it sees pci0000:06, it tries to read the config space of 0000:06:00.0 which doesn’t exist. This causes the above error.

 

Lspci tree is,

 

linux-242:/home/xen-3.3.0 # lspci -t

-+-[0000:06]-+-01.0-[0000:08]----01.0

 |           +-01.1

 |           +-02.0-[0000:07]--

 |           \-02.1

 \-[0000:00]-+-00.0

             +-01.0

             +-01.1

             +-06.0

             +-07.0

             +-08.0

             +-09.0-[0000:05]----07.0

             +-0b.0-[0000:04]----00.0

             +-0c.0-[0000:03]----00.0

             +-0d.0-[0000:02]--

             +-0e.0-[0000:01]--

             +-18.0

             +-18.1

             +-18.2

             +-18.3

             +-19.0

             +-19.1

             +-19.2

             \-19.3

 

Thanks,

Masroor

fix_find_parent.patch
Description: fix_find_parent.patch

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