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Re: [Xen-devel] Re: [Patch RFC] ttm: nouveau accelerated on Xen pv-ops k

To: Michael D Labriola <mlabriol@xxxxxxxx>
Subject: Re: [Xen-devel] Re: [Patch RFC] ttm: nouveau accelerated on Xen pv-ops kernel
From: Jeremy Fitzhardinge <jeremy@xxxxxxxx>
Date: Mon, 15 Mar 2010 16:13:20 -0700
Cc: Arvind R <arvino55@xxxxxxxxx>, Konrad Rzeszutek Wilk <konrad.wilk@xxxxxxxxxx>, xen-devel@xxxxxxxxxxxxxxxxxxx, Joanna Rutkowska <joanna@xxxxxxxxxxxxxxxxxxxxxx>, xen-devel-bounces@xxxxxxxxxxxxxxxxxxx
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On 03/15/2010 07:44 AM, Michael D Labriola wrote:
Hmm... I just verified that this patch fixes KMS/Nouveau issues in Xen on
my two primary test boxes (GeForce 6200, GeForce 7300).  However, on my
really old machines (AGP GeForce2 MX200), this causes a new crash.  These
old boxes were actually working fine in Xen prior to this patch, just
w/out 3d acceleration.  Now I get the following messages in dmesg:

[  129.637319] [drm] nouveau 0000:01:00.0: Allocating FIFO number 1
[  129.638853] [drm] nouveau 0000:01:00.0: nouveau_channel_alloc:
initialised FIFO 1
[  129.643791] X: Corrupted page table at address 40412000
[  129.643815] *pdpt = 0000000015216001 *pde = 0000000000000000
[  129.643856] Bad pagetable: 000f [#1] SMP
[  129.643897] last sysfs file:
[  129.643916] Modules linked in: bridge stp ipv6 autofs4 sunrpc raid1
video output sbs sbshc pci_slot lp sg nouveau snd_intel8x0 snd_ac97_codec
ac97_bus snd_seq_dummy he atm ttm drm_kms_helper snd_seq_oss
snd_seq_midi_event sr_mod snd_seq cdrom drm serio_raw snd_seq_device
snd_pcm_oss snd_mixer_oss snd_pcm e100 mii i2c_algo_bit snd_timer
ata_generic snd pcspkr i2c_i801 i2c_core intel_rng soundcore i82860_edac
snd_page_alloc pata_acpi edac_core parport_pc floppy parport dm_snapshot
dm_zero dm_mirror dm_region_hash dm_log dm_mod raid0 ext3 mbcache jbd
aic7xxx scsi_transport_spi ata_piix libata sd_mod scsi_mod
[  129.644024]
[  129.644024] Pid: 3690, comm: X Not tainted ( #1) P4DC6
[  129.644024] EIP: 0073:[<40394596>] EFLAGS: 00210206 CPU: 0
[  129.644024] EIP is at 0x40394596
[  129.644024] EAX: 40412000 EBX: 40396cd8 ECX: 0909ee98 EDX: 00044000
[  129.644024] ESI: 00000034 EDI: 0909edd8 EBP: bfe7f798 ESP: bfe7f780
[  129.644024]  DS: 007b ES: 007b FS: 0000 GS: 0033 SS: 007b
[  129.644024] Process X (pid: 3690, ti=ea1ce000 task=ea77f110
[  129.644024]
[  129.644024] EIP: [<40394596>] 0x40394596 SS:ESP 007b:bfe7f780
[  129.644024] ---[ end trace 569eb18d737a8611 ]---
[  129.652216] [drm] nouveau 0000:01:00.0: nouveau_channel_free: freeing
fifo 1

And my X log ends abruptly after this line:
(II) NOUVEAU(0): Opened GPU Channel 1

Any ideas?

Well, this is generally the symptom that someone is confusing mfns and pfns, and therefore ends up incorrectly setting the _PAGE_IO flag in some pte. If you run it under strace, can you identify which mapping the fault is happening in?


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