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Description of problem:
When user starts qemu-kvm with invalid (unsupported) machine type, only the list of supported machines is being output back to the user without any information the machine type specified is invalid.

Version-Release number of selected component (if applicable):
any

How reproducible:
100%

Steps to Reproduce:
1. /usr/lib/qemu-kvm -M error
2.
3.

Actual results:
$ qemu-kvm -M ?
Supported machines are:
pc         Standard PC (alias of $SOMETHING)
...

Expected results:
$ qemu-kvm -M ?
Error: Unsupported machine type 'error'
Supported machines are:
pc         Standard PC (alias of $SOMETHING)
...

Additional info:
Patch posted upstream. Details at http://lists.nongnu.org/archive/html/qemu-devel/2013-07/msg05884.html .

Fix included in qemu-kvm-0.12.1.2-2.429.el6

With qemu 428:

[root@localhost ~]# /usr/libexec/qemu-kvm -M error
Supported machines are:
pc         RHEL 6.5.0 PC (alias of rhel6.5.0)
rhel6.5.0  RHEL 6.5.0 PC (default)
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
rhel5.5.0  RHEL 5.5.0 PC
rhel5.4.4  RHEL 5.4.4 PC
rhel5.4.0  RHEL 5.4.0 PC

With 429:

[root@localhost ~]# /usr/libexec/qemu-kvm -M error
qemu-kvm: -M error: Unsupported machine type
Use -M ? to list supported machines!

Since the problem described in this bug report should be
resolved in a recent advisory, it has been closed with a
resolution of ERRATA.

For information on the advisory, and where to find the updated
files, follow the link below.

If the solution does not work for you, open a new bug report.

http://rhn.redhat.com/errata/RHBA-2014-1490.html