Description of problem:
qemu-system-arm does not support the -no-acpi option preventing it from being used with libvirt/virt-manager

Version-Release number of selected component (if applicable):
qemu-system-arm-1.0.1-1

How reproducible:
always

Steps to Reproduce:
1. Create ARM VM
2. Add to libvirt (virsh define <name>)
3. Start: virsh start <name>
  
Actual results:
ARM VM does not start due to 'Option no-acpi not supported on this target' error.

Expected results:
ARM VM shoud just start (either qemu-system-arm should honour no-acpi or libvirt should not add this option for ARM targets).

Additional info:
virsh start vexpress
error: Failed to start domain vexpress
error: internal error process exited while connecting to monitor: Option no-acpi not supported for this target

vexpress.xml (generated with virsh domxml-from-native qemu-argv <file with qemu args>):

<!--
WARNING: THIS IS AN AUTO-GENERATED FILE. CHANGES TO IT ARE LIKELY TO BE 
OVERWRITTEN AND LOST. Changes to this xml configuration should be made using:
  virsh edit vexpress
or other application using the libvirt API.
-->

<domain type='qemu'>
  <name>vexpress</name>
  <uuid>260159b3-e738-9c3e-a1cf-9d5cd574501a</uuid>
  <memory unit='KiB'>1048576</memory>
  <currentMemory unit='KiB'>1048576</currentMemory>
  <vcpu>1</vcpu>
  <os>
    <type arch='arm' machine='vexpress-a9'>hvm</type>
    <kernel>/home/kramer/vexpress/armhfp-vexpress-xfce-mmcblk0/boot/vmlinuz-3.4.2-3.fc17.armv7hl</kernel>
    <initrd>/home/kramer/vexpress/armhfp-vexpress-xfce-mmcblk0/boot/initramfs-3.4.2-3.fc17.armv7hl.img</initrd>
    <cmdline>console=ttyAMA0,115200n8 rw root=/dev/mmcblk0p2 rootwait physmap.enabled=0</cmdline>
    <boot dev='hd'/>
  </os>
  <clock offset='utc'/>
  <on_poweroff>destroy</on_poweroff>
  <on_reboot>restart</on_reboot>
  <on_crash>destroy</on_crash>
  <devices>
    <emulator>/usr/bin/qemu-system-arm</emulator>
    <disk type='file' device='disk'>
      <driver name='qemu' type='raw'/>
      <source file='/home/kramer/vexpress/Fedora-17-armhfp-vexpress-xfce-mmcblk0.img'/>
      <target dev='sd' bus='scsi'/>
      <address type='drive' controller='0' bus='0' target='0' unit='0'/>
    </disk>
    <controller type='scsi' index='0'>
      <address type='pci' domain='0x0000' bus='0x00' slot='0x04' function='0x0'/>
    </controller>
    <controller type='usb' index='0'>
      <address type='pci' domain='0x0000' bus='0x00' slot='0x01' function='0x2'/>
    </controller>
    <interface type='user'>
      <mac address='52:54:00:88:23:a5'/>
      <address type='pci' domain='0x0000' bus='0x00' slot='0x03' function='0x0'/>
    </interface>
    <memballoon model='virtio'>
      <address type='pci' domain='0x0000' bus='0x00' slot='0x05' function='0x0'/>
    </memballoon>
  </devices>
</domain>