I'm using all 64-bit, both host and guest.  And I'm seeing it on two different systems.

I currently have installed on one host, my laptop:

~]$ rpm -qa | egrep -i 'virt|qemu|spice|qxl' | sort
ipxe-roms-qemu-20130517-2.gitc4bce43.fc19.noarch
libgovirt-0.1.0-1.fc19.x86_64
libvirt-1.0.5.2-1.fc19.x86_64
libvirt-client-1.0.5.2-1.fc19.x86_64
libvirt-daemon-1.0.5.2-1.fc19.x86_64
libvirt-daemon-config-network-1.0.5.2-1.fc19.x86_64
libvirt-daemon-config-nwfilter-1.0.5.2-1.fc19.x86_64
libvirt-daemon-driver-interface-1.0.5.2-1.fc19.x86_64
libvirt-daemon-driver-libxl-1.0.5.2-1.fc19.x86_64
libvirt-daemon-driver-lxc-1.0.5.2-1.fc19.x86_64
libvirt-daemon-driver-network-1.0.5.2-1.fc19.x86_64
libvirt-daemon-driver-nodedev-1.0.5.2-1.fc19.x86_64
libvirt-daemon-driver-nwfilter-1.0.5.2-1.fc19.x86_64
libvirt-daemon-driver-qemu-1.0.5.2-1.fc19.x86_64
libvirt-daemon-driver-secret-1.0.5.2-1.fc19.x86_64
libvirt-daemon-driver-storage-1.0.5.2-1.fc19.x86_64
libvirt-daemon-driver-uml-1.0.5.2-1.fc19.x86_64
libvirt-daemon-driver-xen-1.0.5.2-1.fc19.x86_64
libvirt-daemon-kvm-1.0.5.2-1.fc19.x86_64
libvirt-daemon-qemu-1.0.5.2-1.fc19.x86_64
libvirt-gconfig-0.1.6-1.fc19.x86_64
libvirt-glib-0.1.6-1.fc19.x86_64
libvirt-gobject-0.1.6-1.fc19.x86_64
libvirt-python-1.0.5.2-1.fc19.x86_64
perl-Sys-Virt-1.0.5-1.fc19.x86_64
qemu-1.4.2-3.fc19.x86_64
qemu-common-1.4.2-3.fc19.x86_64
qemu-guest-agent-1.4.2-3.fc19.x86_64
qemu-img-1.4.2-3.fc19.x86_64
qemu-kvm-1.4.2-3.fc19.x86_64
qemu-kvm-tools-1.4.2-3.fc19.x86_64
qemu-system-alpha-1.4.2-3.fc19.x86_64
qemu-system-arm-1.4.2-3.fc19.x86_64
qemu-system-cris-1.4.2-3.fc19.x86_64
qemu-system-lm32-1.4.2-3.fc19.x86_64
qemu-system-m68k-1.4.2-3.fc19.x86_64
qemu-system-microblaze-1.4.2-3.fc19.x86_64
qemu-system-mips-1.4.2-3.fc19.x86_64
qemu-system-or32-1.4.2-3.fc19.x86_64
qemu-system-ppc-1.4.2-3.fc19.x86_64
qemu-system-s390x-1.4.2-3.fc19.x86_64
qemu-system-sh4-1.4.2-3.fc19.x86_64
qemu-system-sparc-1.4.2-3.fc19.x86_64
qemu-system-unicore32-1.4.2-3.fc19.x86_64
qemu-system-x86-1.4.2-3.fc19.x86_64
qemu-system-xtensa-1.4.2-3.fc19.x86_64
qemu-user-1.4.2-3.fc19.x86_64
redland-virtuoso-1.0.16-2.fc19.x86_64
spice-glib-0.19-1.fc19.x86_64
spice-gtk-0.19-1.fc19.x86_64
spice-gtk3-0.19-1.fc19.x86_64
spice-gtk-python-0.19-1.fc19.x86_64
spice-server-0.12.3-1.fc19.x86_64
spice-vdagent-0.14.0-2.fc19.x86_64
virt-dmesg-0.3.0-8.fc19.x86_64
virt-install-0.10.0-0.5.gitde1695b2.fc19.noarch
virt-manager-0.10.0-0.5.gitde1695b2.fc19.noarch
virt-manager-common-0.10.0-0.5.gitde1695b2.fc19.noarch
virt-top-1.0.8-4.fc19.x86_64
virtuoso-opensource-6.1.6-3.fc19.x86_64
virt-v2v-0.9.0-2.fc19.x86_64
virt-viewer-0.5.6-1.fc19.x86_64
virt-what-1.12-3.fc19.x86_64
virt-who-0.8-7.fc19.noarch
xorg-x11-drv-qxl-0.1.1-0.8.20130514git77a1594.fc19.x86_64


And, as mentioned above, I create the VM with:

virt-install --name=f19tc3 --ram=1024 --vcpus=2 \
    --graphics=spice --noautoconsole \
    --os-type=linux --os-variant=fedora18 \
    --network=network=default,model=virtio \
    --cdrom=/var/lib/libvirt/images/Fedora-19-TC3-x86_64-netinst.iso \
    --disk=/var/lib/libvirt/images/f19tc3.img,size=10,bus=virtio

which creates this:

~]$ virsh dumpxml f19tc3
<domain type='kvm' id='7'>
  <name>f19tc3</name>
  <uuid>60db09e8-b482-cf88-668e-2fa9499e22bd</uuid>
  <memory unit='KiB'>1048576</memory>
  <currentMemory unit='KiB'>1048576</currentMemory>
  <vcpu placement='static'>2</vcpu>
  <resource>
    <partition>/machine</partition>
  </resource>
  <os>
    <type arch='x86_64' machine='pc-i440fx-1.4'>hvm</type>
    <boot dev='cdrom'/>
    <boot dev='hd'/>
  </os>
  <features>
    <acpi/>
    <apic/>
    <pae/>
  </features>
  <clock offset='utc'/>
  <on_poweroff>destroy</on_poweroff>
  <on_reboot>destroy</on_reboot>
  <on_crash>destroy</on_crash>
  <devices>
    <emulator>/usr/bin/qemu-kvm</emulator>
    <disk type='file' device='disk'>
      <driver name='qemu' type='raw'/>
      <source file='/var/lib/libvirt/images/f19tc3.img'/>
      <target dev='vda' bus='virtio'/>
      <alias name='virtio-disk0'/>
      <address type='pci' domain='0x0000' bus='0x00' slot='0x04' function='0x0'/>
    </disk>
    <disk type='file' device='cdrom'>
      <driver name='qemu' type='raw'/>
      <source file='/var/lib/libvirt/images/Fedora-19-TC3-x86_64-netinst.iso'/>
      <target dev='hdc' bus='ide'/>
      <readonly/>
      <alias name='ide0-1-0'/>
      <address type='drive' controller='0' bus='1' target='0' unit='0'/>
    </disk>
    <controller type='usb' index='0'>
      <alias name='usb0'/>
      <address type='pci' domain='0x0000' bus='0x00' slot='0x01' function='0x2'/>
    </controller>
    <controller type='ide' index='0'>
      <alias name='ide0'/>
      <address type='pci' domain='0x0000' bus='0x00' slot='0x01' function='0x1'/>
    </controller>
    <controller type='pci' index='0' model='pci-root'>
      <alias name='pci0'/>
    </controller>
    <interface type='network'>
      <mac address='52:54:00:ef:89:b0'/>
      <source network='default'/>
      <target dev='vnet0'/>
      <model type='virtio'/>
      <alias name='net0'/>
      <address type='pci' domain='0x0000' bus='0x00' slot='0x03' function='0x0'/>
    </interface>
    <serial type='pty'>
      <source path='/dev/pts/11'/>
      <target port='0'/>
      <alias name='serial0'/>
    </serial>
    <console type='pty' tty='/dev/pts/11'>
      <source path='/dev/pts/11'/>
      <target type='serial' port='0'/>
      <alias name='serial0'/>
    </console>
    <input type='tablet' bus='usb'>
      <alias name='input0'/>
    </input>
    <input type='mouse' bus='ps2'/>
    <graphics type='spice' port='5900' autoport='yes' listen='127.0.0.1'>
      <listen type='address' address='127.0.0.1'/>
    </graphics>
    <video>
      <model type='qxl' ram='65536' vram='65536' heads='1'/>
      <alias name='video0'/>
      <address type='pci' domain='0x0000' bus='0x00' slot='0x02' function='0x0'/>
    </video>
    <memballoon model='virtio'>
      <alias name='balloon0'/>
      <address type='pci' domain='0x0000' bus='0x00' slot='0x05' function='0x0'/>
    </memballoon>
  </devices>
  <seclabel type='dynamic' model='selinux' relabel='yes'>
    <label>system_u:system_r:svirt_t:s0:c39,c563</label>
    <imagelabel>system_u:object_r:svirt_image_t:s0:c39,c563</imagelabel>
  </seclabel>
</domain>