Bug 771128 - "Failed to build sexpr" when adding PCI passthrough device to Xen domain
"Failed to build sexpr" when adding PCI passthrough device to Xen domain
Product: Fedora
Classification: Fedora
Component: libvirt (Show other bugs)
x86_64 Linux
unspecified Severity medium
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Assigned To: Libvirt Maintainers
Fedora Extras Quality Assurance
Depends On:
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Reported: 2012-01-01 13:55 EST by Robin Green
Modified: 2013-05-16 15:54 EDT (History)
11 users (show)

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Fixed In Version:
Doc Type: Bug Fix
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Last Closed: 2012-10-20 21:12:37 EDT
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RHEL 7.3 requirements from Atomic Host:
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Description Robin Green 2012-01-01 13:55:55 EST
Description of problem:
I have been trying to pass through a PCI device (a USB hub) to a Xen domU. virt-manager gives this error when I try to do so.

Version-Release number of selected component (if applicable):

How reproducible:

Steps to Reproduce:
1. Create F16 domain using virsh-install
2. Open the F16 domain in virt-manager and click the Add Hardware button at the bottom of the window
3. Select a PCI USB hub and click the Finish button

Actual results:
An error dialog appears saying:
Error adding device: XML error: failed to build sexpr

Traceback (most recent call last):
  File "/usr/share/virt-manager/virtManager/addhardware.py", line 1048, in add_device
  File "/usr/share/virt-manager/virtManager/domain.py", line 397, in add_device
  File "/usr/share/virt-manager/virtManager/domain.py", line 326, in redefine_cached
  File "/usr/share/virt-manager/virtManager/libvirtobject.py", line 147, in _redefine_xml
    return self._redefine_helper(origxml, newxml)
  File "/usr/share/virt-manager/virtManager/libvirtobject.py", line 137, in _redefine_helper
  File "/usr/share/virt-manager/virtManager/domain.py", line 762, in _define
  File "/usr/share/virt-manager/virtManager/connection.py", line 805, in define_domain
    return self.vmm.defineXML(xml)
  File "/usr/lib64/python2.7/site-packages/libvirt.py", line 2110, in defineXML
    if ret is None:raise libvirtError('virDomainDefineXML() failed', conn=self)
libvirtError: XML error: failed to build sexpr

Expected results:
No error
Comment 1 Cole Robinson 2012-06-07 15:52:35 EDT
Robin, can you provide the virt-manager --debug output when reproducing?
Comment 2 Cole Robinson 2012-10-20 21:12:23 EDT
No response for a while, closing. If anyone can still reproduce, please reopen with the info requested in comment #1
Comment 3 Steven Seed 2013-05-16 14:52:41 EDT
I'd like to reopen this. I'm having this problem currently on a RHEL 6.4 with xen installed. I ran virt-manager --debug, however there is no output on the command line. I've seeing the same error when using virsh to attempt to modify the vm.

Here ist he pci device dump:

virsh # nodedev-dumpxml pci_0000_06_00_0
  <capability type='pci'>
    <product id='0x0dd8'>GF106GL [Quadro 2000]</product>
    <vendor id='0x10de'>NVIDIA Corporation</vendor>
    <capability type='virt_functions'>

Here is what I'm trying to add to the configuration:

    <hostdev mode='subsystem' type='pci' managed='yes'>
          <address domain='0x0000' bus='0x02' slot='0x00' function='0x0' />

And here is the result when I try to save:

error: XML error: failed to build sexpr
Failed. Try again? [y,n,f,?]:
Comment 4 Steven Seed 2013-05-16 14:55:29 EDT
I'm not sure how to re-open this ticket. Can you do that for me?
Comment 5 Laine Stump 2013-05-16 15:54:04 EDT
That error message is very general, and there have been several releases of libvirt since the version in this BZ (which is filed against F16 / libvirt-0.9.6). I would recommend opening a new BZ, then post about it to libvirt-users@redhat.com to make sure that somebody who works on the xen part of libvirt sees it. Almost all libvirt developers working on Fedora are using qemu instead.

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