Comment 11 for bug 1379340

Here's an example of an affected qemu command, as already pointed out the relevant parts are the "-cpu host" and "-smp n" where n>1.

qemu-system-x86_64 -enable-kvm -name instance-000173d4 -S -machine pc-1.0,accel=kvm,usb=off -cpu host -m 16384 -realtime mlock=off -smp 4,sockets=4,cores=1,threads=1 -uuid e3ec1854-0b89-4384-*** -smbios type=1,manufacturer=OpenStack Foundation,product=OpenStack Nova,version=1-2013.2.2-a101-g1a048c5-1,serial=****,uuid=e3ec1854-0b89-4384-*** -no-user-config -nodefaults -chardev socket,id=charmonitor,path=/var/lib/libvirt/qemu/instance-000173d4.monitor,server,nowait -mon chardev=charmonitor,id=monitor,mode=control -rtc base=utc,driftfix=slew -global kvm-pit.lost_tick_policy=discard -no-shutdown -boot strict=on -device piix3-usb-uhci,id=usb,bus=pci.0,addr=0x1.0x2 -drive file=/var/lib/nova/instances/e3ec1854-0b89-4384-9771-88c26764eef9/disk,if=none,id=drive-virtio-disk0,format=qcow2,cache=none -device virtio-blk-pci,scsi=off,bus=pci.0,addr=0x4,drive=drive-virtio-disk0,id=virtio-disk0,bootindex=1 -drive file=/var/lib/nova/instances/e3ec1854
-0b89-4384-9771-88c26764eef9/disk.local,if=none,id=drive-virtio-disk1,format=qcow2,cache=none -device virtio-blk-pci,scsi=off,bus=pci.0,addr=0x5,drive=drive-virtio-disk1,id=virtio-disk1 -drive file=rbd:nova/volume-439f230a-12fa-4538-ab26-01c3f6617ec7:id=nova:key=***==:auth_supported=cephx\;none:mon_host=118.138***,if=none,id=drive-virtio-disk2,format=raw,serial=***,cache=writeback -device virtio-blk-pci,scsi=off,bus=pci.0,addr=0x7,drive=drive-virtio-disk2,id=virtio-disk2 -netdev tap,fd=30,id=hostnet0,vhost=on,vhostfd=31 -device virtio-net-pci,netdev=hostnet0,id=net0,mac=fa:16:***,bus=pci.0,addr=0x3 -chardev file,id=charserial0,path=/var/lib/nova/instances/e3ec1854-0b89-4384-9771-88c26764eef9/console.log -device isa-serial,chardev=charserial0,id=serial0 -chardev pty,id=charserial1 -device isa-serial,chardev=charserial1,id=serial1 -device usb-tablet,id=input0 -vnc 0.0.0.0:1 -k en-us -device cirrus-vga,id=video0,bus=pci.0,addr=0x2 -device virtio-balloon-pci,id=balloon0,bus=pci.0,addr=0x6