Re: [Xen-users] Solved - PCIe/VGA passthrough

["Marc Tousignant" <myrdhn@xxxxxxxxx>]

-----Original Message-----
From: Dariusz Krempa [mailto:imperiaonline4@xxxxxxxxx] 
Sent: Wednesday, September 19, 2012 11:23 AM
To: Marc Tousignant
Subject: Re: [Xen-users] PCIe/VGA passthrough

2012/9/19 Marc Tousignant <myrdhn@xxxxxxxxx>:
>
>
> -----Original Message-----
> From: Dariusz Krempa [mailto:imperiaonline4@xxxxxxxxx]
> Sent: Wednesday, September 19, 2012 9:29 AM
> To: Marc Tousignant
> Subject: Re: [Xen-users] PCIe/VGA passthrough
>
>
> Hi.
> I've spend last few days to turn on vga passthrough on my box and 
> finally i did it. Everything what i've read about configurations tells 
> me that its not possible with my MB (Asus P8H67 + Asus GTX560 Top), but...
> I followed also tutorial from Teo En Ming and i did patch from David 
> Gis. I have no BAR's, then i used ranges from dmesg | grep '1:00.0' | 
> grep mem and did patch like following David's Gis and Teo En Ming
descriptions.
>
> I'm not yet sure that is full success, but Gpu-z and Cpu-z recognized 
> my hardware, also benchmark from Unigin heaven is pretty good. I did 
> pciback configuration for window xp DomU not like Teo En Ming with 
> pci-stub. I hope this will helpfully for You.
>
> ---
>
> Unfortunately, this was not helpful at all. I'm only seeing 1 BAR/mem 
> line pci 0000:01:00.0: BAR 6: assigned [mem 0xcd000000-0xcd01ffff 
> pref]
>
> But my video card has ranges:
>         Region 0: Memory at cc000000 (32-bit, non-prefetchable) [size=16M]
>         Region 1: Memory at b0000000 (64-bit, prefetchable) [size=256M]
>         Region 3: Memory at ca000000 (64-bit, non-prefetchable) [size=32M]
>         Region 5: I/O ports at 9c00 [size=128] What the dmesg seems to 
> be finding is the one line from the lspci output on my card:
>          [virtual] Expansion ROM at cd000000 [disabled] [size=128K]
>
> MarcT
>

I am totally newbie with linux and Xen, but i think You could rebuild
Dom0 or Xen or both, but first try to see what You get from this and compare
to David's Gis output. I have for all "=y"

grep -i xen /boot/config

----

Solved it. Turns out you can't find the memory without first setting up the
kernel commands to hide the device.

dmesg | grep 01:00.0 | grep "pci.*mem"
pci 0000:01:00.0: BAR 0: assigned [mem 0xcc000000-0xccffffff]
pci 0000:01:00.0: BAR 1: assigned [mem 0xb0000000-0xbfffffff 64bit pref]
pci 0000:01:00.0: BAR 3: assigned [mem 0xca000000-0xcbffffff 64bit]
pci 0000:01:00.0: BAR 6: assigned [mem 0xcd000000-0xcd01ffff pref]

MarcT


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