Re: [Xen-ia64-devel] [RFC] Xen machine vector

[Alex Williamson <alex.williamson@xxxxxx>]

On Thu, 2007-05-03 at 21:35 -0600, Alex Williamson wrote:
> I need to add some error catching,
> copyrights, and actually get it working reliably (it seem to be getting
> upcalls while unmapping DMA and ending up in bad page faults in dom0),
> but I thought I'd run this idea by the group before doing all the
> polishing.

FWIW, here's how dom0 is currently panic'ing when booting a domU.  I'm
booting my dom0 with machvec=dig to force it to use the swiotlb path.  A
similar panic occurs with sba_iommu.  I must be missing something in the
unmap case.  Thanks,

        Alex

Unable to handle kernel paging request at virtual address a0007ffffcb46390
swapper[0]: Oops 8813272891392 [1]
Modules linked in:

Pid: 0, CPU 0, comm:              swapper
psr : 0000101008026010 ifs : 8000000000000006 ip  : [<a0000001004f6d60>]    Not 
tainted
ip is at mark_clean+0x60/0xe0
unat: 0000000000000000 pfs : 800000000000038d rsc : 0000000000000008
rnat: 000000000001aaa5 bsps: a00000010012dba0 pr  : 0000000000016565
ldrs: 0000000000000000 ccv : 0000000000000000 fpsr: 0009804c0270033f
csd : 0000000000000000 ssd : 0000000000000000
b0  : a0000001004f8b00 b6  : a0000001004f8940 b7  : 0000000000000000
f6  : 000000000000000000000 f7  : 000000000000000000000
f8  : 000000000000000000000 f9  : 000000000000000000000
f10 : 000000000000000000000 f11 : 000000000000000000000
r1  : a000000101142f30 r2  : e0000000fbdfc000 r3  : 00000000001b8c72
r8  : 00000000001f7bf0 r9  : 000000000003ef7e r10 : e000000000000000
r11 : a000000100f6c900 r12 : a000000100cfbba0 r13 : a000000100cf4000
r14 : ffffffffffffc000 r15 : e0000000fbdfbfff r16 : a0007ffffbd80000
r17 : a0007ffffcb46390 r18 : e0000000fbdfc000 r19 : 0000000000000200
r20 : a000000100f6be48 r21 : a000000100f6c908 r22 : 0000000000000000
r23 : a000000100cf5030 r24 : 0000000000000000 r25 : 0000000000000000
r26 : 800000000000038d r27 : 0000000000000008 r28 : a0000001000685c0
r29 : 00001412082a6010 r30 : 8000000000000006 r31 : 00000000000156a5

Call Trace:
 [<a00000010001d600>] show_stack+0x40/0xa0
                                sp=a000000100cfb750 bsp=a000000100cf53f0
 [<a00000010001e260>] show_regs+0x840/0x880
                                sp=a000000100cfb920 bsp=a000000100cf5398
 [<a0000001000426e0>] die+0x1c0/0x380
                                sp=a000000100cfb920 bsp=a000000100cf5350
 [<a000000100066670>] ia64_do_page_fault+0x870/0x9a0
                                sp=a000000100cfb940 bsp=a000000100cf5300
 [<a000000100069060>] xen_leave_kernel+0x0/0x3e0
                                sp=a000000100cfb9d0 bsp=a000000100cf5300
 [<a0000001004f6d60>] mark_clean+0x60/0xe0
                                sp=a000000100cfbba0 bsp=a000000100cf52d0
 [<a0000001004f8b00>] swiotlb_unmap_single+0x1c0/0x260
                                sp=a000000100cfbba0 bsp=a000000100cf5298
 [<a000000100637c10>] cciss_softirq_done+0x270/0x5e0
                                sp=a000000100cfbba0 bsp=a000000100cf5248
 [<a0000001004c14e0>] blk_done_softirq+0x240/0x2a0
                                sp=a000000100cfbba0 bsp=a000000100cf5230
 [<a000000100095bb0>] __do_softirq+0x1b0/0x340
                                sp=a000000100cfbbb0 bsp=a000000100cf51b0
 [<a000000100095e60>] do_softirq+0x120/0x240
                                sp=a000000100cfbbb0 bsp=a000000100cf5150
 [<a000000100096000>] irq_exit+0x80/0xa0
                                sp=a000000100cfbbb0 bsp=a000000100cf5138
 [<a0000001006d4e70>] evtchn_do_upcall+0x1d0/0x320
                                sp=a000000100cfbbb0 bsp=a000000100cf50a0
 [<a000000100068960>] xen_event_callback+0x380/0x3c0
                                sp=a000000100cfbbb0 bsp=a000000100cf50a0
 [<a0000001004f8b00>] swiotlb_unmap_single+0x1c0/0x260
                                sp=a000000100cfbbb0 bsp=a000000100cf50a0
 <0>Kernel panic - not syncing: Aiee, killing interrupt handler!
 (XEN) Domain 0 crashed: rebooting machine in 5 seconds.
(XEN) Domain0 halts the machine

-- 
Alex Williamson                             HP Open Source & Linux Org.


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