In case you configure libguestfs with a custom QEMU, e.g.:
  $ ./configure [...] QEMU=/path/to/qemu
then the libvirt backend did not use to override it, launching the
appliance with the default QEMU for libvirt.
This does not change the manual emulator overriding using set-hv.
Pino Toscano (2):
  launch: libvirt: get default QEMU from domcapabilities
  launch: libvirt: fix custom hypervisor check
 lib/launch-libvirt.c | 72 +++++++++++++++++++++++++++++++++++++++-----
 1 file changed, 65 insertions(+), 7 deletions(-)
-- 
2.21.0