RE: [Xen-users] Passing a USB printer to a Linux DomU

["Thomas Jensen" <tom.jensen@xxxxxxxxxxxxxxxxxxxxxx>]

I created a test DomU and installed only the base Ubuntu Server OS and CUPS.

I then installed my printer and tried printing a test page all through the
CUPS browser based administration.  When I tried printing a test page, the
following appeared on the console.  I have no idea how to interpret this,
but it seems very coincidental.

[ 2242.157407] Fatal DMA error! Please use 'swiotlb=force'
[ 2242.157438] ------------[ cut here ]------------
[ 2242.157446] kernel BUG at
/build/buildd/linux-2.6.24/debian/build/custom-source-xen/arch/x86/kernel/
pci-dma_32-xen.c:405!
[ 2242.157452] invalid opcode: 0000 [1] SMP
[ 2242.157459] CPU 0
[ 2242.157463] Modules linked in: ppdev parport_pc lp parport usblp ipv6
evdev ext3 jbd mbcache ehci_hc              d uhci_hcd usbcore raid10
raid456 async_xor async_memcpy async_tx xor raid1 raid0 multipath linear
md_m              od dm_mirror dm_snapshot dm_mod fuse
[ 2242.157511] Pid: 14093, comm: usb Not tainted 2.6.24-23-xen #1
[ 2242.157515] RIP: e030:[<ffffffff802144b0>]  [<ffffffff802144b0>]
dma_map_single+0x1a0/0x1e0
[ 2242.157532] RSP: e02b:ffff88001e71bd88  EFLAGS: 00010292
[ 2242.157536] RAX: 000000000000003e RBX: 0000000000051125 RCX:
0000000000000001
[ 2242.157541] RDX: 0000000000000000 RSI: 0000000000000001 RDI:
ffffffff8058ce20
[ 2242.157545] RBP: ffff88001ee38000 R08: 0000000b57416844 R09:
0000000000000000
[ 2242.157549] R10: ffff880001ce4fe0 R11: 0000000000000001 R12:
0000000000002000
[ 2242.157554] R13: ffff88001e046070 R14: 0000000000000000 R15:
0000000000000000
[ 2242.157562] FS:  00007f82398d2700(0000) GS:ffffffff805c7000(0000)
knlGS:0000000000000000
[ 2242.157566] CS:  e033 DS: 0000 ES: 0000
[ 2242.157570] DR0: 0000000000000000 DR1: 0000000000000000 DR2:
0000000000000000
[ 2242.157575] DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7:
0000000000000400
[ 2242.157580] Process usb (pid: 14093, threadinfo ffff88001e71a000, task
ffff8800016d7800)
[ 2242.157584] Stack:  0000000000000000 ffff8800016f23c0 00000000000000d0
ffff8800205da400
[ 2242.157594]  ffff8800016f23d0 ffffffff8809a07b 0000000000000030
0000000000000020
[ 2242.157603]  00000000000000d0 ffffffff80299dbc ffff88001fc04940
000000001ee38000
[ 2242.157612] Call Trace:
[ 2242.157647]  [<ffffffff8809a07b>] :usbcore:usb_hcd_submit_urb+0x1bb/0x8f0
[ 2242.157660]  [<ffffffff80299dbc>] kmem_cache_alloc+0xfc/0x120
[ 2242.157669]  [<ffffffff80299e6e>] cache_alloc_refill+0x8e/0x5f0
[ 2242.157697]  [<ffffffff8809ad0e>] :usbcore:usb_get_urb+0xe/0x20
[ 2242.157713]  [<ffffffff88163026>] :usblp:usblp_write+0x196/0x370
[ 2242.157725]  [<ffffffff8029e34d>] vfs_write+0xed/0x190
[ 2242.157733]  [<ffffffff8029ea53>] sys_write+0x53/0x90
[ 2242.157742]  [<ffffffff8020c698>] system_call+0x68/0x6d
[ 2242.157752]  [<ffffffff8020c630>] system_call+0x0/0x6d
[ 2242.157759]
[ 2242.157761]
[ 2242.157762] Code: 0f 0b eb fe 48 c7 c1 f0 9d 48 80 ba 8e 01 00 00 48 c7
c6 38
[ 2242.157788] RIP  [<ffffffff802144b0>] dma_map_single+0x1a0/0x1e0
[ 2242.157796]  RSP <ffff88001e71bd88>
[ 2242.157807] ---[ end trace 471a18a5df10d8e5 ]---

-----Original Message-----
From: xen-users-bounces@xxxxxxxxxxxxxxxxxxx
[mailto:xen-users-bounces@xxxxxxxxxxxxxxxxxxx] On Behalf Of Matt Richardson
Sent: Wednesday, February 11, 2009 12:45 PM
To: xen-users@xxxxxxxxxxxxxxxxxxx
Subject: Re: [Xen-users] Passing a USB printer to a Linux DomU

On Wed, Feb 11, 2009 at 10:28 AM, Thomas Jensen
<tom.jensen@xxxxxxxxxxxxxxxxxxxxxx> wrote:
<snip>
>
> I did not manually create any of these entries in the /dev directory.  
> I presume they are all created as a result of the pci passthrough.
>  Furthermore, my printer is displayed in the output of lpinfo -v:
>
> network socket
> network beh
> direct usb://hp/deskjet%205100?serial=MY3AN4J3337A
> direct hp:/usb/deskjet_5100?serial=MY3AN4J3337A
> direct hpfax
> network http
> network ipp
> network lpd
> direct scsi
>
> Any other suggestions?  It appears that it is very close to working as 
> anticipated.

That looks like a CUPS problem, like the queue is enabled but not accepting
or something to that effect.  Are you using the usb or hp socket to connect
to the printer?

Also, my apologies if this is straying off topic.  I'm happy to take it off
list.

--
Matt

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