Description of problem:
As we have backport support for vhd(x) image format to rhel6.5, refer to bug 963420, but fail to create VHD(X) format disk files over 127GB using qemu-img.
btw, also tried rhel7.0 witch has no such issue.

Version-Release number of selected component (if applicable):
host info:
# uname -r && rpm -q qemu-kvm-rhev
2.6.32-412.el6.x86_64
qemu-kvm-rhev-0.12.1.2-2.397.el6.x86_64

How reproducible:
100%

Steps to Reproduce:
1.# qemu-img create -f vpc sluo-data-disk.vhd 127G
Formatting 'sluo-data-disk.vhd', fmt=vpc size=136365211648 
# qemu-img info sluo-data-disk.vhd
image: sluo-data-disk.vhd
file format: vpc
virtual size: 127G (136365219840 bytes)
disk size: 260K
2.# qemu-img create -f vpc sluo-data-disk.vhd 128G
Formatting 'sluo-data-disk.vhd', fmt=vpc size=137438953472 
The image size is too large for file format 'vpc'
3.# qemu-img create -f vpc sluo-data-disk.vhd 130G
Formatting 'sluo-data-disk.vhd', fmt=vpc size=139586437120 
The image size is too large for file format 'vpc'

Actual results:

Expected results:
it could create VHD(X) format disk files over 127GB using qemu-img successfully.

Additional info:
Tried rhel7.0, host info,
# uname -r && rpm -q qemu-kvm
3.10.0-3.el7.x86_64
qemu-kvm-1.5.2-4.el7.x86_64

# qemu-img create -f vpc sluo-data-disk.vhd 130G
Formatting 'sluo-data-disk.vhd', fmt=vpc size=139586437120 
# qemu-img info sluo-data-disk.vhd
image: sluo-data-disk.vhd
file format: vpc
virtual size: 130G (139596710400 bytes)
disk size: 264K