[Xen-bugs] [Bug 1613] New: xen 4.0.0 and linux 2.6.31.12 dom0 running win7 domu gets very slow when using vga passthru with intel gma 3100 onboard graphics

[bugzilla-daemon@xxxxxxxxxxxxxxxxxxx]

http://bugzilla.xensource.com/bugzilla/show_bug.cgi?id=1613

           Summary: xen 4.0.0 and linux 2.6.31.12 dom0 running win7 domu
                    gets very slow when using vga passthru with intel gma
                    3100 onboard graphics
           Product: Xen
           Version: unspecified
          Platform: x86-64
        OS/Version: Windows
            Status: NEW
          Severity: blocker
          Priority: P2
         Component: Unspecified
        AssignedTo: xen-bugs@xxxxxxxxxxxxxxxxxxx
        ReportedBy: email@xxxxxxxxxxxxxxxx


xen 4.0.0 and linux 2.6.31.12 dom0 running win7 domu gets very slow when using
vga passthru with intel gma 3100 onboard graphics. Only when windows native
driver is disabled and vgafailsave drivers are used system is bekoming stable.

Problem only occurs when whatching HD movies or when 3d operations like windows
aero look or cad programs are run.

similar error is reported:
http://lists.xensource.com/archives/html/xen-users/2010-05/msg00274.html

used script to disable hardware:
echo "8086 29b2" > /sys/bus/pci/drivers/pci-stub/new_id
echo "0000:00:02.0" > /sys/bus/pci/devices/0000:00:02.0/driver/unbind
echo "0000:00:02.0" > /sys/bus/pci/drivers/pci-stub/bind
echo "8086 29b3" > /sys/bus/pci/drivers/pci-stub/new_id
echo "0000:00:02.1" > /sys/bus/pci/devices/0000:00:02.1/driver/unbind
echo "0000:00:02.1" > /sys/bus/pci/drivers/pci-stub/bind

used cfg:
import os, re
arch = os.uname()[4]
if re.search('64', arch):
    arch_libdir = 'lib64'
else:
    arch_libdir = 'lib'

kernel = "/usr/lib/xen/boot/hvmloader"
builder='hvm'
memory = 1024

# Should be at least 2KB per MB of domain memory, plus a few MB per vcpu.
shadow_memory = 8
name = "xenwin7"

#pci=[ '0000:01:00.0' ]
pci=[ '00:02.0','00:02.1' ]
usb=1
usbdevice="host:413c:2100"
gfx_passthru=1
#vif = [ 'type=ioemu, bridge=xenbr0' ]
vif = [ 'type=ioemu' ]
acpi = 1
apic = 1
disk = [ 'file:/home/q/xen/xenwin7.img,hda,w',
'file:/home/q/xen/windows7.iso,hdc:cdrom,r' ]

device_model = '/usr/' + arch_libdir + '/xen/bin/qemu-dm'

#-----------------------------------------------------------------------------
# boot on floppy (a), hard disk (c) or CD-ROM (d) 
# default: hard disk, cd-rom, floppy
boot="dc"
sdl=0
vnc=1
vncconsole=1
vncpasswd=''

serial='pty'
usbdevice='tablet'


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