[root@kvm ~]# virsh create /root/ns1.jesse64.xml
    error: Failed to create domain from /root/ns1.jesse64.xml
    error: internal error: process exited while connecting to monitor: qemu-kvm: -machine pc-i440fx-trusty,accel=kvm,usb=off: Unsupported machine type

So I run /usr/libexec/qemu-kvm -machine ? and see

Supported machines are:
none                 empty machine
pc                   RHEL 7.0.0 PC (i440FX + PIIX, 1996) (alias of pc-i440fx-rhel7.0.0)
pc-i440fx-rhel7.0.0  RHEL 7.0.0 PC (i440FX + PIIX, 1996) (default)
rhel6.6.0            RHEL 6.6.0 PC
rhel6.5.0            RHEL 6.5.0 PC
rhel6.4.0            RHEL 6.4.0 PC
rhel6.3.0            RHEL 6.3.0 PC
rhel6.2.0            RHEL 6.2.0 PC
rhel6.1.0            RHEL 6.1.0 PC
rhel6.0.0            RHEL 6.0.0 PC

So is there some package I need to install? The VM was created on a Ubuntu KVM host.

1 Answer 1


You're seeing this error because Ubuntu put their own customizations into its version of libvirt and qemu/KVM. RHEL, of course, did the same thing.

But there's always a machine type that will work, namely, pc. This is always aliased to the latest i440fx machine type available on the hypervisor at the time the VM is defined.

Somewhere in the XML you'll find something like:

<type arch='x86_64' machine='pc-i440fx-trusty'>hvm</type>

Just change this to:

<type arch='x86_64' machine='pc'>hvm</type>

(And note that if you use the new pc-q35-xxx machine types, the generic machine type is q35.)

  • Thanx thanx thanx!
    – frag
    Nov 2, 2015 at 20:41
  • of course on RHEL, the machine type best adjusted to run on the OS is the RHEL-7.
    – dyasny
    Nov 2, 2015 at 21:14

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