Re: [Xen-users] vga passthrough xen 4.1.1 ubuntu 11.10 kernel 3.1.0-0301rc9-generic x86_64

[chris <tknchris@xxxxxxxxx>]

lspci shows there is a driver loaded in dom0 for your vga. i think that is your problem, try blacklisting i915 and see if it works. you also might have better luck doing the unbinding and rebinding manually

check out

http://wiki.xen.org/xenwiki/VTdHowTo

section Binding Devices to pci-stub

I had setup a large number of boxes doing vtd and i found that doing everything the most manual way made it much easier to debug problems one by one as i encountered and solved them.

good luck,

chris

On Tue, Oct 18, 2011 at 5:33 PM, Martin Wolf <mwolf@xxxxxxxxxxxxxx> wrote:

hello,

i hope i did not sent it twice since im not sure if the first one was posted.

okay now to the problem


im trying to get a vm with vga passthrough running but i get always this
error:  Error: pci: PCI Backend and pci-stub don't own device 0000:00:02.0

The PC contains an Intel DQ67SW mainboard (q67 chipset) and an i5-2400s.
according to xm dmesg | grep I/O
(XEN) I/O virtualisation enabled
 vt-d is active.

im using kernel 3.1.0-0301rc9-generic x86_64 with CONFIG_XEN_PCIDEV_BACKEND=m
and i loaded the module with following options in /etc/modprobe.d/xen-pciback
options xen-pciback passthrough=1
dmesg shows that with
[   15.566815] xen-pciback: backend is passthrough

and this is my config file for the vm:


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 = 6144

# Should be at least 2KB per MB of domain memory, plus a few MB per vcpu.
shadow_memory = 32
name = "xenwin7"
vif = [ 'type=ioemu, bridge=virbr0' ]
acpi = 1
apic = 1
#disk = [ 'phy:/dev/sdb,hda,w' ]
#disk = [ 'phy:/dev/sdb,hda,w', 'phy:/dev/cdrom,hdc:cdrom.r' ]
#disk = [ 'file:/home/xen/xenwin7.img,hda,w', 'file:/home/xen/windows7.iso,hdc:$
disk = [ 'file:/home/martin/xenwin7.img,hda,w', 'phy:/dev/cdrom,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'

gfx_passthru=1
pci=['00:02.0']

this is the lspci output of the videocard.

00:02.0 VGA compatible controller: Intel Corporation 2nd Generation Core Processor Family Integrated Graphics Controller (rev 09) (prog-if 00 [VGA controller])
        Subsystem: Intel Corporation Device 2008
        Flags: bus master, fast devsel, latency 0, IRQ 307
        Memory at fe000000 (64-bit, non-prefetchable) [size=4M]
        Memory at d0000000 (64-bit, prefetchable) [size=256M]
        I/O ports at f000 [size=64]
        Expansion ROM at <unassigned> [disabled]
        Capabilities: <access denied>
        Kernel driver in use: i915
        Kernel modules: i915


i really hope you can give me an idea where to continue.

best wishes and thanks in advance.
martin

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