RE: [Xen-devel] DMA-Bug using PCI-Passthrough (xen-3.1.0, gentoo amd64)

["Ian Pratt" <Ian.Pratt@xxxxxxxxxxxx>]

> 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.

Can you repro using the linux kernel that's part of the Xen 3.1.0
distribution?

Ian

 
> ~ # 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
> 
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