Description of problem:
I install FC6Test1 on a VT machine and tried to boot HVM guest and xenU guest 
on it.
Xenu worked well.
But HVM guest could not be created.


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


How reproducible:


Steps to Reproduce:
1. Get a HVM guest image
2. Modify the xmexample.hvm 
3. Create HVM guest

  
Actual results:
HVM guest could not be created. No qemu window popup after executed xm create.
xm list shows the guest was blocked.

[root@vt-fc /]# xm list
Name                              ID Mem(MiB) VCPUs State  Time(s)
Domain-0                           0      256     2 r-----   621.2
ExampleDomain                      5       64     1 -b----     6.1
ExampleHVMDomain                   1      512     1 -b----     0.0

Expected results:
HVM guest should be booted up.

Additional info: