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Description of problem:
Disabling X acceleration by setting Option "NoAccel" "On" in xorg.conf provides a tiny performance increase for QEMU/KVM guests using Cirrus display adapter as indicated by glxgears (these numbers are from RHEL 6.2 host/guest on a Lenovo laptop):

NoAccel Off : 78 FPS
NoAccel On  : 79 FPS

There's a patch in Fedora already to do this by default:

http://pkgs.fedoraproject.org/gitweb/?p=xorg-x11-drv-cirrus.git;a=blob_plain;f=cirrus-1.2.0-qemu.patch;h=5bcfda86300bf1efda98f248716033182f9dbada;hb=HEAD

Version-Release number of selected component (if applicable):
RHEL 6.2

This request was not resolved in time for the current release.
Red Hat invites you to ask your support representative to
propose this request, if still desired, for consideration in
the next release of Red Hat Enterprise Linux.

This request was erroneously removed from consideration in Red Hat Enterprise Linux 6.4, which is currently under development.  This request will be evaluated for inclusion in Red Hat Enterprise Linux 6.4.

This request was evaluated by Red Hat Product Management for
inclusion in a Red Hat Enterprise Linux release.  Product
Management has requested further review of this request by
Red Hat Engineering, for potential inclusion in a Red Hat
Enterprise Linux release for currently deployed products.
This request is not yet committed for inclusion in a release.

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/RHEA-2013-0301.html