I'm getting a failure message when starting using virsh start  (/usr/bin/kvm is 
altered to point to upstream as described)
# virsh start Win7one
error: Failed to start domain Win7one
error: internal error Child process (LC_ALL=C 
PATH=/usr/local/sbin:/usr/local/bin:/usr/bin:/usr/sbin:/sbin:/bin /usr/bin/kvm 
-help) status unexpected: exit status 1

I had problems on the network tap device when startting via 
./qemu-system-x86_64 --enable-kvm -name Win7one -S -M pc-0.12 -enable-kvm -m 
2048 -smp 2...

# ./testqemuup 
char device redirected to /dev/pts/3
qemu-system-x86_64: -netdev tap,fd=36,id=hostnet0,vhost=on,vhostfd=37: 
TUNGETIFF ioctl() failed: Bad file descriptor
TUNSETOFFLOAD ioctl() failed: Bad file descriptor
qemu-system-x86_64: -netdev tap,fd=36,id=hostnet0,vhost=on,vhostfd=37: 
vhost-net requested but could not be initialized
qemu-system-x86_64: -netdev tap,fd=36,id=hostnet0,vhost=on,vhostfd=37: Device 
'tap' could not be initialized


Did remove the tap device definition and it's usage as a pci device. After that 
I got a core dump  message, but probably coresize is set to zero.
See the attached file for details of qemu-system-x86_64

ldd on the file looks okay.

** Attachment added: "testres_20121026A.txt"
   
https://bugs.launchpad.net/ubuntu/+source/qemu-kvm/+bug/1071011/+attachment/3414792/+files/testres_20121026A.txt

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https://bugs.launchpad.net/bugs/1071011

Title:
  specific device not available in client (passthrough) with high cpu
  load on host, none in client

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