[Xen-users] intel DQ45CB gma4500 VGA Passthrough Windows7 display deadly slow

[wealdwind <wealdwind@xxxxxxxxx>]

Hi,

I succeeded  in VGA pass through on my intel dq45cb motherboard.

Xen4.0.0 was downloaded from xen.org.
Dom0 is 2.6.32.x/stable which was downloaed form jeremy's repository.
Dom0 os is Ubuntu Lucid.

I could pass through the onboard intel GMA4500 to domU windows7. The
following is my hvm config:

kernel = "hvmloader"
builder='hvm'
memory = 1028
shadow_memory = 32
memory_sharing = 0
name = "win7"
vcpus=1
pae=1
acpi=1
apic=1
vif = [ 'type=ioemu, bridge=br0' ]
disk = [ 'file:/opt/virtualmachines/win7.raw,hda,w',
'file:/opt/iso/win7-x86-32.iso,ioemu:hdc:cdrom,r']
device_model = 'qemu-dm'
vnc=1
vnclisten="0.0.0.0"
vncunused=1
vncpasswd=''

tsc_mode=1
localtime=1

usb=1

xen_platform_pci=1
pci=[ '01:00.0', '00:1b.0', '00:02.0','00:02.1' ]
gfx_passthru=1



Everything seems fine.  I could boot up the domU windows7. At the
begining  windows7 was working perfectly, but after about 1 minute
later, the screen display seems very slow.

When I clicked a menu, the menu would pop up about 20 seconds later.

Windows7 used the built-in  GMA4500 video driver, which is the same with
the driver when ran windows7 directly on the motherboard.


I think there must be something wrong, but I couldn't figure it out.

There was no error log in xend qemu-dm and windows7 event log.

Pls. help me.

Thanks

Weald





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