[Xen-users] xend accesses wrong pci slot while enabling pci pass-through on xen3.3.0

["Masroor Vettuparambil" <Masroor.Vettuparambil@xxxxxxxxxxxx>]

Hi all,

 

I am trying the pci-passthrough on xen 3.3.0. I binded the pci slot to pciback using late binding.

But xend fails to allocate this slot to domU.

 

linux-242:/home/xen-3.3.0 # xm create -c pci=08:01.0 /etc/xen/xen3.3_guest1

Using config file "/etc/xen/xen3.3_guest1".

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

 

xend log is,

 

[2008-10-06 11:14:23 4077] ERROR (xmlrpclib2:178) Internal error handling xend.domain.create

Traceback (most recent call last):

  File "//usr/lib64/python/xen/util/xmlrpclib2.py", line 131, in _marshaled_dispatch

    response = self._dispatch(method, params)

  File "/usr/lib64/python2.5/SimpleXMLRPCServer.py", line 415, in _dispatch

    return func(*params)

  File "//usr/lib64/python/xen/xend/server/XMLRPCServer.py", line 79, in domain_create

    info = XendDomain.instance().domain_create(config)

  File "//usr/lib64/python/xen/xend/XendDomain.py", line 965, in domain_create

    dominfo = XendDomainInfo.create(config)

  File "//usr/lib64/python/xen/xend/XendDomainInfo.py", line 92, in create

    vm.start()

  File "//usr/lib64/python/xen/xend/XendDomainInfo.py", line 425, in start

    XendTask.log_progress(31, 60, self._initDomain)

  File "//usr/lib64/python/xen/xend/XendTask.py", line 209, in log_progress

    retval = func(*args, **kwds)

  File "//usr/lib64/python/xen/xend/XendDomainInfo.py", line 2256, in _initDomain

    self._createDevices()

  File "//usr/lib64/python/xen/xend/XendDomainInfo.py", line 1902, in _createDevices

    devid = self._createDevice(devclass, config)

  File "//usr/lib64/python/xen/xend/XendDomainInfo.py", line 1869, in _createDevice

    return self.getDeviceController(deviceClass).createDevice(devConfig)

  File "//usr/lib64/python/xen/xend/server/DevController.py", line 94, in createDevice

    self.setupDevice(config)

  File "//usr/lib64/python/xen/xend/server/pciif.py", line 415, in setupDevice

    devs_str = dev.find_coassigned_devices(True)

  File "//usr/lib64/python/xen/util/pci.py", line 460, in find_coassigned_devices

    dev = self.find_the_uppermost_pci_bridge()

  File "//usr/lib64/python/xen/util/pci.py", line 423, in find_the_uppermost_pci_bridge

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

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

    self.detect_dev_info()

  File "//usr/lib64/python/xen/util/pci.py", line 603, in detect_dev_info

    class_dev = self.pci_conf_read16(PCI_CLASS_DEVICE)

  File "//usr/lib64/python/xen/util/pci.py", line 566, in pci_conf_read16

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

OSError: [Errno 2] No such file or directory: \047/sys/bus/pci/devices/0000:06:00.0/config\047

 

 

Lspci –t 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

 

The pci slot of NIC is 0000:08:01.0 and is connected to the pci bridge 0000:06:01.0. But xend is trying to read the config space of 0000:06:00.0, which does not exist. Any idea on this error?

 

Thanks,

Masroor

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