Description of problem:
When install windows 7 (32bit, 64bit) and 2008r2 64bit as a hvm guest, it will get a blue screen during the installation.

Version-Release number of selected component (if applicable):
kernel-xen-2.6.18-164.el5

How reproducible:
100%

Steps to Reproduce:
1. $ cat win7-32.cfg
maxmem = 1024
memory = 1024
vcpus = 1
builder = "hvm"
kernel = "/usr/lib/xen/boot/hvmloader"
boot = "dc"
pae = 1
acpi = 1
apic = 1
localtime = 0
on_poweroff = "destroy"
on_reboot = "restart"
on_crash = "restart"
sdl = 0
vnc = 1
vncunused = 1
vnclisten = "0.0.0.0"
device_model = "/usr/lib64/xen/bin/qemu-dm"
disk = [ "file:/var/lib/xen/images/win7-64.img,hda,w", "file:/root/iso/win7-64.iso,hdc:cdrom,r"]
vif = [ "mac=00:13:54:33:02:32,bridge=xenbr0,script=vif-bridge" ]

$ qemu-img create  /var/lib/xen/images/win7-64.img -f raw 20G
Formatting '/var/lib/xen/images/win7-64.img', fmt=raw, size=20971520 kB

$ xm create win7-32.cfg
  
Actual results:
The guest will get into windows error recovery page after it reboot to prepare environment setup during installation. After choose "start windows normally", it will get a blue screen.

The defect doesn't happen on kernel-xen-2.6.18-187.el5

Expected results:
The installation should succeed.

Additional info:

The installation for those 3 guests can succeed on kernel-xen-2.6.18-187.el5.

$ cat /boot/grub/grub.conf
...

title Red Hat Enterprise Linux Server (2.6.18-164.el5xen)
	root (hd0,0)
	kernel /xen.gz-2.6.18-164.el5 
	module /vmlinuz-2.6.18-164.el5xen ro root=/dev/VolGroup00/LogVol00 rhgb quiet
	module /initrd-2.6.18-164.el5xen.img
...

$ uname -a
Linux intel-q9400-4-4 2.6.18-164.el5xen #1 SMP Tue Aug 18 15:59:52 EDT 2009 x86_64 x86_64 x86_64 GNU/Linux