Failed to create KVM on Trusty ppc64le, no supported architecture for os type 'hvm'

Trying to use uvtool to create a KVM instance with Trusty kernel on a ppc64le system will fail with:

uvt-kvm: error: libvirt: internal error: no supported architecture for os type 'hvm'

Command:
uvt-kvm create kvm-test release=xenial arch=ppc64el

ProblemType: Bug
DistroRelease: Ubuntu 14.04
Package: linux-image-3.13.0-142-generic 3.13.0-142.191
ProcVersionSignature: Ubuntu 3.13.0-142.191-generic 3.13.11-ckt39
Uname: Linux 3.13.0-142-generic ppc64le
AlsaDevices: Error: command ['ls', '-l', '/dev/snd/'] failed with exit code 2: ls: cannot access /dev/snd/: No such file or directory
AplayDevices: Error: [Errno 2] No such file or directory: 'aplay'
ApportVersion: 2.14.1-0ubuntu3.27
Architecture: ppc64el
ArecordDevices: Error: [Errno 2] No such file or directory: 'arecord'
CurrentDmesg:

Date: Thu Mar 1 11:09:14 2018
Lsusb:
 Bus 004 Device 001: ID 1d6b:0003 Linux Foundation 3.0 root hub
 Bus 003 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
 Bus 002 Device 001: ID 1d6b:0003 Linux Foundation 3.0 root hub
 Bus 001 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
PciMultimedia:

ProcEnviron:
 TERM=xterm-256color
 PATH=(custom, no user)
 XDG_RUNTIME_DIR=<set>
 LANG=en_US.UTF-8
 SHELL=/bin/bash
ProcFB:

ProcKernelCmdLine: root=UUID=36575f9a-a03d-4d21-874c-db9886a8ffbd ro console=hvc0
ProcLoadAvg: 1.18 0.67 0.28 1/1074 8837
ProcLocks:
 1: POSIX ADVISORY WRITE 6459 00:11:43064 0 0
 2: FLOCK ADVISORY WRITE 2334 00:11:27831 0 EOF
 3: POSIX ADVISORY WRITE 2264 00:11:35027 0 EOF
 4: POSIX ADVISORY WRITE 2387 00:11:35925 0 EOF
ProcSwaps:
 Filename Type Size Used Priority
 /swap.img file 8388544 0 -1
ProcVersion: Linux version 3.13.0-142-generic (buildd@bos02-ppc64el-009) (gcc version 4.8.4 (Ubuntu 4.8.4-2ubuntu1~14.04.3) ) #191-Ubuntu SMP Fri Feb 2 12:12:31 UTC 2018
RelatedPackageVersions:
 linux-restricted-modules-3.13.0-142-generic N/A
 linux-backports-modules-3.13.0-142-generic N/A
 linux-firmware 1.127.24
RfKill: Error: [Errno 2] No such file or directory: 'rfkill'
SourcePackage: linux
UpgradeStatus: No upgrade log present (probably fresh install)
cpu_cores: Number of cores present = 20
cpu_coreson: Number of cores online = 20
cpu_freq:
 min: 3.694 GHz (cpu 124)
 max: 3.694 GHz (cpu 1)
 avg: 3.694 GHz
cpu_runmode:
 Could not retrieve current diagnostics mode,
 No firmware implementation of function
cpu_smt: SMT=8