libvirt users - Jan 2011 - ERROR Unable to deny all devices for (solution)

Hi. This is not a question, I had the following problem and I want to share
my solution.

-------

I tried to create a new virtual machine with this command:

$ virt-install --connect qemu:///system -n vmTeste -r 512 -f
/var/lib/libvirt/images/vmTeste.qcow2 -s 2 -c
/media/Data/isos/debian-506-amd64-netinst.iso --vnc --noautoconsole
--accelerate --hvm


And I got this error:

ERROR    Unable to deny all devices for vmTeste: No such file or directory
Traceback (most recent call last):
  File "/usr/bin/virt-install", line 1033, in <module>
    main()
  File "/usr/bin/virt-install", line 915, in main
    start_time, guest.start_install)
  File "/usr/bin/virt-install", line 957, in do_install
    dom = install_func(conscb, progresscb, wait=(not wait))
  File "/usr/lib/pymodules/python2.6/virtinst/Guest.py", line 973, in
start_install
    return self._do_install(consolecb, meter, removeOld, wait)
  File "/usr/lib/pymodules/python2.6/virtinst/Guest.py", line 1038, in
_do_install
    "install")
  File "/usr/lib/pymodules/python2.6/virtinst/Guest.py", line 1009, in
_create_guest
    dom = self.conn.createLinux(start_xml, 0)
  File "/usr/lib/python2.6/dist-packages/libvirt.py", line 1277, in
createLinux
    if ret is None:raise libvirtError('virDomainCreateLinux() failed',
conn=self)
libvirtError: Unable to deny all devices for vmTeste: No such file or
directory


I found the same error looking for in the internet, similar errors including
in this list. I tried to solve changing permissions, editing xml and
defining the virtual machine, etc.

No long time ago I made some changes to optimize kernel performance for
desktop as described here (it's in Portuguese, but can be undertood reading
the commands and files) and this changes caused the above errors (in Ubuntu
10.10 and Fedora 14).  I undid the changes and I had no more errors.

Possibly I can be wrong, but it worked for me.
__

*Lucas Arbiza*

email: lucas.arbiza at gmail.com
celular: +55 (55) 9152 7561

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On 14/01/2011, at 4:54 AM, Lucas Arbiza wrote:
> No long time ago I made some changes to optimize kernel performance for
> desktop as described here (it's in Portuguese, but can be undertood
reading
> the commands and files) and this changes caused the above errors (in Ubuntu
> 10.10 and Fedora 14).
URL? :)