Re: [Xen-devel] Mixed results -- VGA Passthrough with Intel 82Q35 IGD

[chris <tknchris@xxxxxxxxx>]

I would guess something relating to the fact that dell modifies the vga bios if i remember. I think there is a way to extract that vga rom and supply it when starting the vm. Someone here could probably shed a little more light, I haven't done it myself I just recall seeing it on this list in the past.

On Tue, Apr 26, 2011 at 9:50 AM, Jason Sonnek <jsonnek@xxxxxxxxx> wrote:

I have two workstations with Intel 82Q35 Integrated Graphics. The
first is a Dell Optiplex 755 (Intel Core 2 Duo, latest Dell BIOS); the
second is a custom-built machine (Intel Core 2 Quad Q9550, Intel
DQ35JO motherboard, latest Intel BIOS rev. 1143). VGA Passthrough to a
Windows 7 guest works flawlessly on the former. Using the exact same
Xen/Dom0/DomU configuration on the latter, the monitor flickers when
the guest is started and then goes blank. The monitor remains powered
on while the guest is running, suggesting it is receiving some sort of
signal, but no pixels are ever illuminated.

I'm running OpenSUSE 11.3 in Dom0, along with the Xen 4.0.0 package
distributed by SuSE. I've also tried OpenSUSE 11.4 in Dom0 with the
Xen 4.0.2 package; same result in both cases. VT-d is enabled on both
machines, and PCI passthrough of other devices works correctly on both
workstations. With the exception of the memory ranges assigned to the
two IGD devices, the messages emitted in the QEMU and xend logs on
both workstations are more or less identical. I've tried updating the
BIOS to various revs on the non-working machine. Using 'iommu=verbose'
on the Xen command-line, I don't see anything in the ring buffer that
would suggest a problem.

Any suggestions on how I could further debug this issue? Below I've
included hwinfo for the two IGD devices. I'd be happy to attach other
logs if they would help.

Thanks!

Jason


Working 82Q35:

17: PCI 02.0: 0300 VGA compatible controller (VGA)
  [Created at pci.318]
  Unique ID: _Znp.D6lJTogQStC
  SysFS ID: /devices/pci0000:00/0000:00:02.0
  SysFS BusID: 0000:00:02.0
  Hardware Class: graphics card
  Model: "Dell OptiPlex 755"
  Vendor: pci 0x8086 "Intel Corporation"
  Device: pci 0x29b2 "Q35"
  SubVendor: pci 0x1028 "Dell"
  SubDevice: pci 0x0211 "OptiPlex 755"
  Revision: 0x02
  Driver: "pciback"
  Driver Modules: "pciback", "pciback"
  Memory Range: 0xfea00000-0xfea7ffff (rw,non-prefetchable)
  I/O Ports: 0xec90-0xec97 (rw)
  Memory Range: 0xd0000000-0xdfffffff (ro,non-prefetchable)
  Memory Range: 0xfeb00000-0xfebfffff (rw,non-prefetchable)
  IRQ: 16 (30 events)
  I/O Ports: 0x3c0-0x3df (rw)
  Module Alias: "pci:v00008086d000029B2sv00001028sd00000211bc03sc00i00"
  Driver Info #0:
    XFree86 v4 Server Module: intel
  Driver Info #1:
    XFree86 v4 Server Module: intel
    3D Support: yes
    Extensions: dri
  Config Status: cfg=new, avail=yes, need=no, active=unknown

18: PCI 02.1: 0380 Display controller
 [Created at pci.318]
 Unique ID: ruGf.kY6yMez4kU2
 SysFS ID: /devices/pci0000:00/0000:00:02.1
 SysFS BusID: 0000:00:02.1
 Hardware Class: graphics card
 Model: "Dell OptiPlex 755"
 Vendor: pci 0x8086 "Intel Corporation"
 Device: pci 0x29b3 "82Q35 Express Integrated Graphics Controller"
 SubVendor: pci 0x1028 "Dell"
 SubDevice: pci 0x0211 "OptiPlex 755"
 Revision: 0x02
 Driver: "pciback"
 Driver Modules: "pciback", "pciback"
 Memory Range: 0xfea80000-0xfeafffff (rw,non-prefetchable)
 Module Alias: "pci:v00008086d000029B3sv00001028sd00000211bc03sc80i00"
 Config Status: cfg=new, avail=yes, need=no, active=unknown



Non-working 82Q35:


15: PCI 02.0: 0300 VGA compatible controller (VGA)
 [Created at pci.318]
 Unique ID: _Znp.9oGqrtGx1Y7
 SysFS ID: /devices/pci0000:00/0000:00:02.0
 SysFS BusID: 0000:00:02.0
 Hardware Class: graphics card
 Model: "Intel Q35"
 Vendor: pci 0x8086 "Intel Corporation"
 Device: pci 0x29b2 "Q35"
 SubVendor: pci 0x8086 "Intel Corporation"
 SubDevice: pci 0x4f4a
 Revision: 0x02
 Driver: "pciback"
 Driver Modules: "pciback", "pciback"
 Memory Range: 0xe0380000-0xe03fffff (rw,non-prefetchable,disabled)
 I/O Ports: 0x3458-0x345f (rw,disabled)
 Memory Range: 0xd0000000-0xdfffffff (ro,non-prefetchable,disabled)
 Memory Range: 0xe0200000-0xe02fffff (rw,non-prefetchable,disabled)
 IRQ: 16 (no events)
 I/O Ports: 0x3c0-0x3df (rw)
 Module Alias: "pci:v00008086d000029B2sv00008086sd00004F4Abc03sc00i00"
 Driver Info #0:
   XFree86 v4 Server Module: intel
 Driver Info #1:
   XFree86 v4 Server Module: intel
   3D Support: yes
   Extensions: dri
 Config Status: cfg=new, avail=yes, need=no, active=unknown

16: PCI 02.1: 0380 Display controller
 [Created at pci.318]
 Unique ID: ruGf.gEeSljZbJ9D
 SysFS ID: /devices/pci0000:00/0000:00:02.1
 SysFS BusID: 0000:00:02.1
 Hardware Class: graphics card
 Model: "Intel 82Q35 Express Integrated Graphics Controller"
 Vendor: pci 0x8086 "Intel Corporation"
 Device: pci 0x29b3 "82Q35 Express Integrated Graphics Controller"
 SubVendor: pci 0x8086 "Intel Corporation"
 SubDevice: pci 0x4f4a
 Revision: 0x02
 Driver: "pciback"
 Driver Modules: "pciback", "pciback"
 Memory Range: 0xe0300000-0xe037ffff (rw,non-prefetchable)
 Module Alias: "pci:v00008086d000029B3sv00008086sd00004F4Abc03sc80i00"
 Config Status: cfg=new, avail=yes, need=no, active=unknown

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