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

[Thomas Richard <thomas9999@xxxxxxxxx>]

Hey,

I tested the same procedure with another vBar=pBar mapping ofcourse for 
an ati X300 today. It gave me the same results. I have a feeling I'm 
missing something here. Another, noteworthy, strange thing is that when 
i press the enter button on the keyboard that is attached to my dom0 
kernel (the PS/2 keyboard) the screen shifts a little to the right. When 
i press the enter button enough times, it just makes a full round. So it 
seems like my dom0 is still able to influence the graphics card that is 
passed to my HVM guest? The card is hidden from dom0 with pciback at 
boottime.
Greetings
Thomas Richard

Op 18/06/2010 14:20, Thomas Richard schreef:
> 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

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