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[Xen-devel] VGA Passthrough with Nvidia GeForce 7900GS and Asus P7P55D-E, some problems


  • To: xen-devel@xxxxxxxxxxxxxxxxxxx
  • From: Thomas Richard <thomas9999@xxxxxxxxx>
  • Date: Fri, 18 Jun 2010 14:20:27 +0200
  • Delivery-date: Fri, 18 Jun 2010 05:22:00 -0700
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Hey all,

I got pretty excited when reading about the VGA Passthrough features in Xen 4.0 so i decided to give it a go. I've had partial success, like some other in here. I've got output on my VGA port but my windows HVM guest reports that the VGA doesn't work. Windows XP says: Couldn't start device (10) and Windows 7 says: Windows has stopped the device because it reported problems (40).

To make this work I:
-built the kernel from Jeremy's tree (2.6.32.15)
-extracted my VGA bios with nvflash
-checked out xen-4.0-testing
-applied the loadvbios, vBar=pBar (xen), vBar=pBar (qemu) and claimvgacycle patches
-copied the vgabios in my xen tree
-built xen

This is the output for lspci -v -s 01:00.0:
01:00.0 VGA compatible controller: nVidia Corporation G71 [GeForce 7900 GS] (rev a1)
        Subsystem: ASUSTeK Computer Inc. Device 8224
        Flags: bus master, fast devsel, latency 0, IRQ 10
        Memory at f6000000 (32-bit, non-prefetchable) [size=16M]
        Memory at e0000000 (64-bit, prefetchable) [size=256M]
        Memory at f5000000 (64-bit, non-prefetchable) [size=16M]
        I/O ports at dc00 [size=128]
        Expansion ROM at f7ee0000 [disabled] [size=128K]
        Capabilities: <access denied>
        Kernel driver in use: pci-stub
        Kernel modules: nvidiafb

I've attached my dmesg, xm dmesg and qemu log files and my hvm config file.

I noticed a few things which might cause problems. In de xm dmesg file i found this:
(XEN) Intel VT-d Snoop Control supported.
(XEN) Intel VT-d DMA Passthrough not supported.
(XEN) Intel VT-d Queued Invalidation supported.
(XEN) Intel VT-d Interrupt Remapping not supported.
Is DMA Passthrough or Interrupt remapping a requirement to make VGA Passthrough work? I think my motherboard should support these features though, does this have to do with my kernel build or something?

In my qemu log file i saw this:
pt_iomul_init: Error: pt_iomul_init can't open file /dev/xen/pci_iomul: No such file or directory: 0x1:0x0.0x0

and

pt_register_regions: IO region registered (size=0x01000000 base_addr=0xf6000000) pt_register_regions: IO region registered (size=0x10000000 base_addr=0xe000000c) pt_register_regions: IO region registered (size=0x01000000 base_addr=0xf5000004) pt_register_regions: IO region registered (size=0x00000080 base_addr=0x0000ac01) pt_register_regions: Expansion ROM registered (size=0x00020000 base_addr=0xf7ae0002)

These bytes are off by a few. I don't know why and i don't know if it makes any difference.

Can anyone give me any pointers on where i should look to find the problem? Also, could anybody mail me a working (with vga passthrough) .config file for the 2.6.32.15 kernel?

Thanks for the help

Greetings
Thomas Richard

Attachment: dmesg.log
Description: Text document

Attachment: qemu-dm-winxp.log
Description: Text document

Attachment: windows7.hvm
Description: Text document

Attachment: xm_dmesg.log
Description: Text document

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