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

[Jeremy Fitzhardinge <jeremy@xxxxxxxx>]

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:
> /sys/devices/pci0000:00/0000:00:01.0/0000:01:00.0/boot_vga
> [  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 (2.6.31.6-mdl5 #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
> task.ti=ea1ce000)
> [  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?
    J

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