DMA-Bug using PCI-Passthrough (xen-3.1.0, gentoo amd64)

[Stefan Neuwirth <neuwirt-xen-devel@trillian.hd.shuttle.de>]

Hi there,

I'm running xen-3.1.0 using gentoo amd64 for dom0. When starting a PV
guest domain everything is fine, up to the moment I try to configure
the ethernet device. The device is a real ethernet card that shown to
the guest by using pci passthrough.

~ # ifconfig eth4
eth4      Link encap:Ethernet  HWaddr 00:00:D1:ED:14:02  
          BROADCAST MULTICAST  MTU:1500  Metric:1
          RX packets:0 errors:0 dropped:0 overruns:0 frame:0
          TX packets:0 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:1000 
          RX bytes:0 (0.0 b)  TX bytes:0 (0.0 b)
          Interrupt:22 

~ # ifconfig eth4 192.168.0.131 netmask 255.255.255.0 up
----------- [cut here ] --------- [please bite here ] ---------
Kernel BUG at ...arch/x86_64/kernel/../../i386/kernel/pci-dma-xen.c:331
invalid opcode: 0000 [1] SMP 
CPU 0 
Modules linked in: usbcore starfire mii
Pid: 2978, comm: ifconfig Not tainted 2.6.18-xen #8
RIP: e030:[<ffffffff80210bdd>]  [<ffffffff80210bdd>] dma_map_single+0x19a/0x1b2
RSP: e02b:ffff88001f517d48  EFLAGS: 00010292
RAX: 000000000000002f RBX: ffff88000019a810 RCX: ffff88001f516000
RDX: ffffffffff578000 RSI: 0000000000000001 RDI: ffffffff80561340
RBP: 00000004397da810 R08: 00000000a83abafa R09: 0000000000000000
R10: 0000000000000000 R11: 00000000000000c8 R12: 0000000000000600
R13: ffff88000007f070 R14: 0000000000000070 R15: ffff88001f7e0000
FS:  00002b009bbc36d0(0000) GS:ffffffff805e5000(0000) knlGS:0000000000000000
CS:  e033 DS: 0000 ES: 0000
Process ifconfig (pid: 2978, threadinfo ffff88001f516000, task ffff8800001eb8c0)
Stack:  ffff88001f7e05e0 ffff88001f6d37c0 ffff88001f7e05e0 ffff88001f7e0500
 000000000000000f ffffffff880047e4 0000000000000000 ffffc20000280000
 000000001fad8340 ffffc200002d0070 ffffc200002d0040 ffff88001f7e0000
Call Trace:
 [<ffffffff880047e4>] :starfire:netdev_open+0x264/0x690
 [<ffffffff80452ee0>] dev_open+0x2d/0x70
 [<ffffffff80450ccb>] dev_change_flags+0x5c/0x11e
 [<ffffffff8049394d>] devinet_ioctl+0x2a4/0x6a7
 [<ffffffff80217749>] do_page_fault+0xdf8/0x1198
 [<ffffffff80446c55>] sock_ioctl+0x214/0x239
 [<ffffffff80287f71>] do_ioctl+0x21/0x79
 [<ffffffff8028823d>] vfs_ioctl+0x274/0x28d
 [<ffffffff802740e5>] fd_install+0x25/0x5f
 [<ffffffff802882b1>] sys_ioctl+0x5b/0x7e
 [<ffffffff80209f8a>] system_call+0x86/0x8b
 [<ffffffff80209f04>] system_call+0x0/0x8b


Code: 0f 0b 68 78 15 4f 80 c2 4b 01 48 89 e8 48 83 c4 08 5b 5d 41 
RIP  [<ffffffff80210bdd>] dma_map_single+0x19a/0x1b2
 RSP <ffff88001f517d48>
 Segmentation fault

The same happens when using a tulip based ethernet card instead of the
adaptec starfire card. 

Any hints?

  Stefan