[Xen-users] getting X to work, GPU lockups on dom0

[Jonathan Nieder <jrnieder@xxxxxxxxx>]

Hi all,

Debian sid system.  NV34M graphics card (GeForce FX Go5200 64M).  I'm
trying to get started using Xen on my laptop.  CPU is a Pentium 4 with
no vmx, so this is all PV.  I install the kernel and hypervisor, boot
into the Xen dom0, and try to start X so I can launch a web browser
and see what to do next.

Unfortunately X fails to start.  The screen turns black and stays that
way, though I can blindly run a few commands.  Xorg.0.log has a few
hundred

        (EE) FBDEV(0): FBIOPUTCMAP: Invalid argument

lines.

Looking more closely, I see that the actual trouble happened a little
earlier: dmesg informs me:

| [    8.703713] [drm] nouveau 0000:01:00.0: PFIFO_DMA_PUSHER - Ch 0 Get 
0x10000000 Put 0x0000fdc0 State 0xc0000000 (err: MEM_FAULT) Push 0x00000000
| [    8.704276] Console: switching to colour frame buffer device 175x65
| [   10.553368] [drm] nouveau 0000:01:00.0: PFIFO_DMA_PUSHER - Ch 0 Get 
0x10000000 Put 0x00010048 State 0xc0000000 (err: MEM_FAULT) Push 0x00000000
| [   12.402789] [drm] nouveau 0000:01:00.0: PFIFO_DMA_PUSHER - Ch 0 Get 
0x10000000 Put 0x000101c8 State 0xc0000000 (err: MEM_FAULT) Push 0x00000000
| [   14.252200] [drm] nouveau 0000:01:00.0: PFIFO_DMA_PUSHER - Ch 0 Get 
0x10000000 Put 0x000103cc State 0xc0000000 (err: MEM_FAULT) Push 0x00000000
| [   14.260058] [drm] nouveau 0000:01:00.0: GPU lockup - switching to software 
fbcon

By contrast, when I boot the same kernel on bare hardware I don't get
the PFIFO_DMA_PUSHER or GPU lockup messages and X works fine.

Hypervisor is xen-hypervisor-4.1-i386 from Debian, version 4.1.2-2.
Reproducible with linux-image-3.2.0-1-686-pae version 3.2.4-1 and with
linus's master (8597559a78e1, 2012-02-06) and linux-next
(e9e792b45a9b, 2012-02-06).

dmesg from running the native kernel (good) and dom0 (bad) attached.

I also tried blacklisting the nouveau kernel module and starting X
with the vesa driver.  That also didn't work.

Is this behavior expected?  Does starting X in the dom0 work on other
cards?

Curious,
Jonathan

Attachment: dmesg.native
Description: Text document

Attachment: dmesg.dom0
Description: Text document

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