[Xen-devel] MSI causing softpanics in guest

[Anish Bhatt <anish@xxxxxxxxxxxxx>]

lspci shows MSI enabled for PCI device. PCI passthrough works fine. 
However, as soon as the MSI driver for card is insmodded, kernel panics. 
This is on xen-unstable.  Tried the same with xen-3.3.0 which is 
supposed to have MSI passthrough, but the same guest shows MSI as disabled.
Any else seen this bug, or know of a workaround ?

Trace is as follows :

------------[ cut here ]------------
kernel BUG at 
/usr/src/xen/xen-unstable.hg/linux-2.6.18-xen.hg/drivers/xen/core/evtchn.c:809!
invalid opcode: 0000 [#1]
SMP
Modules linked in: nfemsg nfdvnet ipv6 binfmt_misc dm_mod nfe usbcore 
ext3 jbd processor fuse
CPU:    0
EIP:    0061:[<c02487f5>]    Tainted: GF     VLI
EFLAGS: 00210097   (2.6.18.8-xen #2)
EIP is at evtchn_get_xen_pirq+0x35/0x40
eax: ffffffff   ebx: 00000002   ecx: c0372e60   edx: 00000000
esi: c2103560   edi: c03d3080   ebp: 000004f9   esp: ed385dac
ds: 007b   es: 007b   ss: 0069
Process modprobe (pid: 2590, ti=ed384000 task=ed7b1100 task.ti=ed384000)
Stack: c0248aef 00000000 00000000 00000000 00000000 00000000 00000000 
00000000
      00000000 00000000 00000000 00000000 00000000 00000000 00000000 
00000000
      00000000 00000000 00000000 00000000 00000000 00000000 00000000 
00000000
Call Trace:
[<c0248aef>] startup_pirq+0x3f/0x250
[<c0150b50>] setup_irq+0x160/0x1b0
[<ee0dd270>] nfe_interrupt_handler+0x0/0x30 [nfemsg]
[<c0150c43>] request_irq+0xa3/0xc0
[<ee02c8ad>] nfemsg_module_init+0x8ad/0x133e [nfemsg]
[<c030531b>] cond_resched+0x2b/0x40
[<c0305369>] wait_for_completion+0x19/0xf0
[<c0142818>] sys_init_module+0x148/0x1b50
[<c010595f>] syscall_call+0x7/0xb
Code: 00 00 89 d1 d3 e0 85 05 c4 2c 42 c0 74 1a 8b 14 95 c0 c0 44 c0 89 
d0 c1 e8 1c 83 e8 01 75 0c c1 ea 0c 81 e2 ff ff 00 00 89 d0 c3 <0f> 0b 
29 03 a4 f1 32 c0 eb ea 90 83 ec 08 89 74 24 04 89 c6 a1
EIP: [<c02487f5>] evtchn_get_xen_pirq+0x35/0x40 SS:ESP 0069:ed385dac
### card [0] start: host progs ###
-bash-3.2#
Message from syslogd@drake at Sep 19 15:36:44 ...
kernel: ------------[ cut here ]------------

Message from syslogd@drake at Sep 19 15:36:44 ...
kernel: kernel BUG at 
/usr/src/xen/xen-unstable.hg/linux-2.6.18-xen.hg/drivers/xen/core/evtchn.c:809!
Message from syslogd@drake at Sep 19 15:36:44 ...
kernel: invalid opcode: 0000 [#1]

Message from syslogd@drake at Sep 19 15:36:44 ...
kernel: SMP

Message from syslogd@drake at Sep 19 15:36:44 ...
kernel: CPU:    0

Message from syslogd@drake at Sep 19 15:36:44 ...
kernel: EIP is at evtchn_get_xen_pirq+0x35/0x40

Message from syslogd@drake at Sep 19 15:36:44 ...
kernel: eax: ffffffff   ebx: 00000002   ecx: c0372e60   edx: 00000000

Message from syslogd@drake at Sep 19 15:36:44 ...
kernel: esi: c2103560   edi: c03d3080   ebp: 000004f9   esp: ed385dac

Message from syslogd@drake at Sep 19 15:36:44 ...
kernel: ds: 007b   es: 007b   ss: 0069

Message from syslogd@drake at Sep 19 15:36:44 ...
kernel: Process modprobe (pid: 2590, ti=ed384000 task=ed7b1100 
task.ti=ed384000)
Message from syslogd@drake at Sep 19 15:36:44 ...
kernel: Stack: c0248aef 00000000 00000000 00000000 00000000 00000000 
00000000 00000000
Message from syslogd@drake at Sep 19 15:36:44 ...
kernel:        00000000 00000000 00000000 00000000 00000000 00000000 
00000000 00000000
Message from syslogd@drake at Sep 19 15:36:44 ...
kernel:        00000000 00000000 00000000 00000000 00000000 00000000 
00000000 00000000
Message from syslogd@drake at Sep 19 15:36:44 ...
kernel: Call Trace:

Message from syslogd@drake at Sep 19 15:36:44 ...
kernel: Code: 00 00 89 d1 d3 e0 85 05 c4 2c 42 c0 74 1a 8b 14 95 c0 c0 
44 c0 89 d0 c1 e8 1c 83 e8 01 75 0c c1 ea 0c 81 e2 ff ff 00 00 89 d0 c3 
<0f> 0b 29 03 a4 f1 32 c0 eb ea 90 83 ec 08 89 74 24 04 89 c6 a1
Message from syslogd@drake at Sep 19 15:36:44 ...
kernel: EIP: [<c02487f5>] evtchn_get_xen_pirq+0x35/0x40 SS:ESP 
0069:ed385dac
--
As long as the music's loud enough, we won't hear the world falling apart.


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