Bug 679862

Description of problem:

libvirt fails with "Invalid argument" when trying to create a new virtual machine on an AMD Magny-Cours 4x12 48 Core platform (http://www.supermicro.com/Aplus/motherboard/Opteron6100/SR56x0/H8QGi-F.cfm) with the "virt-manager" GUI or with the virt-install command line tool. This does not happen with "virt-install" if the CPU pinning is specified with the "--cpuset=auto" option. However to the best of my knowledge it is impossible to specify this option in the "virt-manager" GUI; which make it useless to create virtual machines on this platform.
 
Version-Release number of selected component (if applicable):

libvirt-0.8.3-2.fc14.x86_64
libvirt-client-0.8.3-2.fc14.x86_64
virt-manager-0.8.5-1.fc14.noarch


How reproducible:

Always.

Steps to Reproduce:
1. Try to create a virtual machine with the "virt-manager" GUI.

or

1. Try to create a virtual machine with the "virt-install" tool without using the "--cpuset" option.
  
Actual results:

--------------------------------------------------------------------------
[root@xtreme:~]# virt-install -n myvm -r 2048 --nodisks --pxe

Starting install...
ERROR    internal error Process exited while reading console log output: libvir: error : cannot set CPU affinity on process 0: Invalid argument


Domain installation does not appear to have been
successful. If it was, you can restart your domain
by running 'virsh start myvm'; otherwise, please
restart your installation.
[root@xtreme:~]# virt-install -n myvm -r 2048 --nodisks --pxe --vcpus=48

Starting install...
ERROR    internal error Process exited while reading console log output: libvir: error : cannot set CPU affinity on process 0: Invalid argument


Domain installation does not appear to have been
successful. If it was, you can restart your domain
by running 'virsh start myvm'; otherwise, please
restart your installation.
[root@xtreme:~]#
--------------------------------------------------------------------------

Expected results:

--------------------------------------------------------------------------
[root@xtreme:~]# virt-install -n nito -r 2048 --nodisks --pxe --vcpus=48 --cpuset=auto

Starting install...
Creating domain...                                                                                              |    0 B     00:00     
Domain installation still in progress. You can reconnect to 
the console to complete the installation process.
[root@xtreme:~]#
--------------------------------------------------------------------------

Additional info:

This was already reported by someone else on Fedora 13 under Bug#644646 (https://bugzilla.redhat.com/show_bug.cgi?id=644646)