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[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index] RE: [Xen-devel] MSI causing softpanics in guest
Hi, Keir, This is an RFC patch, which is not tested now (It will cost some time to setup my test environments). I want to ensure I am on the same page with you. So could you pleas have a look and point to me which part I may be missing? Thanks! Shan Haitao -----Original Message----- From: Keir Fraser [mailto:keir.fraser@xxxxxxxxxxxxx] Sent: 2008年9月24日 14:05 To: Shan, Haitao; Anish Bhatt Cc: Jan Beulich; xen-devel@xxxxxxxxxxxxxxxxxxx Subject: Re: [Xen-devel] MSI causing softpanics in guest So, which of us is going to patch pcifront? :-) -- Keir On 24/9/08 02:24, "Shan, Haitao" <haitao.shan@xxxxxxxxx> wrote: > It is supposed to work on dom0. This is a bug. > Please refer to Keir's reply in this mail thread. > > Shan Haitao > > -----Original Message----- > From: Anish Bhatt [mailto:anish@xxxxxxxxxxxxx] > Sent: 2008年9月24日 8:08 > To: Shan, Haitao > Cc: Jan Beulich; xen-devel@xxxxxxxxxxxxxxxxxxx; Keir Fraser > Subject: Re: [Xen-devel] MSI causing softpanics in guest > > No, the bug_on is not triggered in dom0. I also saw the following error > message in xm dmesg, : > /physdev.c:90:d0 remap pirq fa vector 49 while not unmap/ > Its part of the code added for MSI, I wonder if its of any significance. > > -Anish > > Shan, Haitao wrote: >> Just some thoughts on Anish's problem. It seems he reveals a bug in current >> code, I think. >> >> Currently, evnchn_map_pirq is hooked on msi_map_vector >> (pci_enable_msi->msi_capability_init->msi_map_vector). Here the pirq type is >> set to IRQT_PIRQ. Then request_irq should succeed since pirq type is already >> set. >> >> However, this path only works on the assumption that msi_map_vector and >> request_irq are executed in the same domain, to be more specific, dom0. >> For PV domU guest, there is no msi_map_vector in its pci_enable_msi ( PV domU >> actually asks dom0 to do the msi map, instead. This is a decision made by >> Keir and Yunhong long ago. I think it is base on security considerations). So >> its irq type is not set correctly (What's more, it incorrectly sets the >> dom0's irq type). Then request_irq can trigger this bug_on(). >> >> Anish, if you use the device in dom0 itself, does it also have this bug_on? >> >> Keir and Jan, >> Do you think this explanation is reasonable for issues Anish met? >> >> Best Regards >> Shan Haitao >> >> -----Original Message----- >> From: Jan Beulich [mailto:jbeulich@xxxxxxxxxx] >> Sent: 2008年9月23日 15:24 >> To: Anish Bhatt >> Cc: Keir Fraser; Shan, Haitao; xen-devel@xxxxxxxxxxxxxxxxxxx >> Subject: Re: [Xen-devel] MSI causing softpanics in guest >> >> So the question is what irq you pass in to request_irq() and where you got >> it from. Jan >> >> >>>>> Anish Bhatt <anish@xxxxxxxxxx> 23.09.08 07:04 >>> >>>>> >> I put a printk before BUG_ON, Its expecting IRQT_PIRQ, but getting >> IRQT_UNBOUND instead. >> -Anish >> >> Jan Beulich wrote: >> >>>>>> Keir Fraser <keir.fraser@xxxxxxxxxxxxx> 20.09.08 10:15 >>> >>>>>> >>>>>> >>>> On 3.3.0 you need to specify msi=1 on Xen's command line to enable MSI. In >>>> xen-unstable, MSI support is always enabled. >>>> >>>> I changed a check in evtchn_get_xen_pirq() into a BUG_ON() as it looks to >>>> me >>>> like it should never trigger. Jan Beulich was the original authour of that >>>> function -- cc'ed in case he can indicate whether I've actually broken the >>>> function. :-) >>>> >>>> >>> No, I think that BUG_ON() you added is valid. It definitely is in the >>> context >>> of startup_pirq(). I'd be curious to know what the type of that irq really >>> is, >>> but that cannot be determined from the backtrace alone. Anish, could you >>> perhaps add a simple printk() before the BUG_ON()? Unfortunately the >>> driver in question does not appear to be part of the tree, so we can't even >>> check what it does prior to calling request_irq()... >>> >>> -- Keir >>> >>> On 19/9/08 20:53, "Anish Bhatt" <anish@xxxxxxxxxxxxx> wrote: >>> >>> >>> >>>> 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:8 >>> 09> >>> ! >>> >>> >>>> 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:8 >>> 09> >>> ! >>> >>> >>>> 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. >> >> >> _______________________________________________ >> Xen-devel mailing list >> Xen-devel@xxxxxxxxxxxxxxxxxxx >> http://lists.xensource.com/xen-devel >> > > > -- > As long as the music's loud enough, we won't hear the world falling apart. > Attachment:
fixup_translate_xen_pirqs.patch _______________________________________________ Xen-devel mailing list Xen-devel@xxxxxxxxxxxxxxxxxxx http://lists.xensource.com/xen-devel
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