vmbuilder crashes with libvirtError in defineXML() when os type 'hvm' not available with kvm

[pklaus]

I tried to set up a kvm virtual machine while the host itself is a virtual machine (Ubuntu 11.04 running on Mac OS X using Parallels 6). It seems to me, that kvm cannot work in that setup but vmbuilder starts to set up the machine and fails in the end with this backtrace. I think the error should be caught.

ProblemType: Crash
DistroRelease: Ubuntu 11.04
Package: python-vm-builder 0.12.4+bzr462-0ubuntu1
ProcVersionSignature: Ubuntu 2.6.38-5.32-generic 2.6.38-rc6
Uname: Linux 2.6.38-5-generic x86_64
Architecture: amd64
Date: Wed Mar 2 11:09:47 2011
ExecutablePath: /usr/bin/vmbuilder
InterpreterPath: /usr/bin/python2.7
PackageArchitecture: all
ProcCmdline: /usr/bin/python /usr/bin/vmbuilder kvm hostname --hostname myvm --suite natty --addpkg vim-nox --arch amd64 --mem 256 --libvirt qemu:///system
ProcEnviron:
 PATH=(custom, no user)
 LANG=en_US.UTF-8
 LANGUAGE=en_US:en
 SHELL=/bin/bash
PythonArgs: ['/usr/bin/vmbuilder', 'kvm', 'hostname', '--hostname', 'myvm', '--suite', 'natty', '--addpkg', 'vim-nox', '--arch', 'amd64', '--mem', '256', '--libvirt', 'qemu:///system']
SourcePackage: vm-builder
Title: vmbuilder crashed with libvirtError in defineXML(): internal error no supported architecture for os type 'hvm'
UpgradeStatus: No upgrade log present (probably fresh install)
UserGroups:

[Serge Hallyn (serge-hallyn)]

Thanks for submitting this bug. Agreed, it should be caught.

[Sergey Svishchev (svs)]

KVM does support nesting, though.

[pklaus (pklaus)]

Yes. This is plausible. The user, however, should be given that answer when trying to do so instead of being given the backtrace.

[Serge Hallyn (serge-hallyn)]

@pklaus

thanks. At this point, replacing informative python backtraces with pretty error messages is not a goal, but if you'd like to provide straightforward patches I'll apply them.