[Xen-devel] Xen-unstable-staging: Xen BUG at iommu_map.c:455

[Sander Eikelenboom <linux@xxxxxxxxxxxxxx>]

Hi all,

I just tested xen-unstable staging (changeset: git:0522407-dirty) 

with revert of commit 1aeb1156fa43fe2cd2b5003995b20466cd19a622
(due to an already reported but not yet resolved issue)

and build with qemu xen from 
git://xenbits.xen.org/staging/qemu-upstream-unstable.git
(to include the pci command register patch from Jan)


and now came across this new splat when starting an HVM with PCI passtrhough:

(XEN) [2015-03-31 20:58:20.710] io.c:429: d17: bind: m_gsi=37 g_gsi=36 
dev=00.00.5 intx=0
(XEN) [2015-03-31 20:58:21.100] Xen BUG at iommu_map.c:455
(XEN) [2015-03-31 20:58:21.100] ----[ Xen-4.6-unstable  x86_64  debug=y  Not 
tainted ]----
(XEN) [2015-03-31 20:58:21.100] CPU:    0
(XEN) [2015-03-31 20:58:21.100] RIP:    e008:[<ffff82d080155bb1>] 
iommu_pde_from_gfn+0x38/0x430
(XEN) [2015-03-31 20:58:21.100] RFLAGS: 0000000000010202   CONTEXT: hypervisor
(XEN) [2015-03-31 20:58:21.100] rax: 0000000000000008   rbx: 0000000000000003   
rcx: ffff82c000802000
(XEN) [2015-03-31 20:58:21.100] rdx: ffff82e007d56740   rsi: ffffffffffffffff   
rdi: ffff8305167dd000
(XEN) [2015-03-31 20:58:21.100] rbp: ffff82d0802efad8   rsp: ffff82d0802efa78   
r8:  ffff83054eb755b0
(XEN) [2015-03-31 20:58:21.100] r9:  0000000000000003   r10: 0000000000000200   
r11: ffff82d0802fc0d0
(XEN) [2015-03-31 20:58:21.100] r12: ffff82e0075527e0   r13: 00000000000005e9   
r14: 0000000000000000
(XEN) [2015-03-31 20:58:21.100] r15: 00007d2000000000   cr0: 0000000080050033   
cr4: 00000000000006f0
(XEN) [2015-03-31 20:58:21.100] cr3: 000000051a197000   cr2: 00007efdd5ee1d48
(XEN) [2015-03-31 20:58:21.100] ds: 0000   es: 0000   fs: 0000   gs: 0000   ss: 
e010   cs: e008
(XEN) [2015-03-31 20:58:21.100] Xen stack trace from rsp=ffff82d0802efa78:
(XEN) [2015-03-31 20:58:21.100]    ffff8305167dd000 ffff82d0802efb30 
ffffffffffffffff ffff8305167dd190
(XEN) [2015-03-31 20:58:21.100]    0000000000000286 ffff82e007d56740 
ffff82e007552800 0000000000000003
(XEN) [2015-03-31 20:58:21.100]    ffff82e0075527e0 00000000000005e9 
0000000000000000 00007d2000000000
(XEN) [2015-03-31 20:58:21.100]    ffff82d0802efb98 ffff82d0801560b6 
00007d2f7fd104e7 00000001802351d2
(XEN) [2015-03-31 20:58:21.100]    00000000003aa93f ffffffffffffffff 
0000000200000001 ffff8305167dd938
(XEN) [2015-03-31 20:58:21.100]    ffff820040000ff8 ffff8305167dd000 
000000000020941c 0000000000000000
(XEN) [2015-03-31 20:58:21.100]    0000000000000000 0000000000000000 
0000000000000000 0000000000000000
(XEN) [2015-03-31 20:58:21.100]    0000000000000000 0000000000000000 
ffff8305167dd938 ffff8305167dd000
(XEN) [2015-03-31 20:58:21.100]    ffff82e0075527e0 00000000000005e9 
0000000000000000 00007d2000000000
(XEN) [2015-03-31 20:58:21.100]    ffff82d0802efbf8 ffff82d08015a54d 
0000000000000000 ffff8305167dd020
(XEN) [2015-03-31 20:58:21.100]    ffff82d0802e8000 00000000003aa93f 
ffff82d0802efbf8 0000000000000000
(XEN) [2015-03-31 20:58:21.100]    ffff8305167dd000 0000000000000800 
ffff8305167dd000 0000000000000000
(XEN) [2015-03-31 20:58:21.100]    ffff82d0802efc98 ffff82d08014c6c1 
ffff82d0802efc78 ffff82d08012c298
(XEN) [2015-03-31 20:58:21.100]    0000000000000286 ffff82d0802efc28 
0000000000000020 0000000000000000
(XEN) [2015-03-31 20:58:21.100]    0000000000000000 0000000000000000 
0000000800000000 00007f6525ed2004
(XEN) [2015-03-31 20:58:21.100]    ffff83054eb1ab60 ffff83055cc6c300 
0000000000000282 00007f6525ed2004
(XEN) [2015-03-31 20:58:21.100]    ffff8305167dd000 00007f6525ed2004 
ffff8305167dd000 0000000000000005
(XEN) [2015-03-31 20:58:21.100]    ffff82d0802efca8 ffff82d08014908b 
ffff82d0802efd98 ffff82d080161f2d
(XEN) [2015-03-31 20:58:21.100]    0000000000000020 0000000000000000 
0000000000000005 0000000000000001
(XEN) [2015-03-31 20:58:21.100]    ffff82d080331bb8 0000000000000001 
ffff82d0802efde8 ffff82d080120d00
(XEN) [2015-03-31 20:58:21.100] Xen call trace:
(XEN) [2015-03-31 20:58:21.100]    [<ffff82d080155bb1>] 
iommu_pde_from_gfn+0x38/0x430
(XEN) [2015-03-31 20:58:21.100]    [<ffff82d0801560b6>] 
amd_iommu_map_page+0x10d/0x4e6
(XEN) [2015-03-31 20:58:21.100]    [<ffff82d08015a54d>] 
arch_iommu_populate_page_table+0x179/0x4d8
(XEN) [2015-03-31 20:58:21.100]    [<ffff82d08014c6c1>] 
iommu_do_pci_domctl+0x395/0x604
(XEN) [2015-03-31 20:58:21.100]    [<ffff82d08014908b>] 
iommu_do_domctl+0x17/0x1a
(XEN) [2015-03-31 20:58:21.100]    [<ffff82d080161f2d>] 
arch_do_domctl+0x2469/0x26e1
(XEN) [2015-03-31 20:58:21.100]    [<ffff82d080104a6f>] do_domctl+0x1a1f/0x1d60
(XEN) [2015-03-31 20:58:21.100]    [<ffff82d080234c9b>] syscall_enter+0xeb/0x145
(XEN) [2015-03-31 20:58:21.100] 
(XEN) [2015-03-31 20:58:22.167] 
(XEN) [2015-03-31 20:58:22.176] ****************************************
(XEN) [2015-03-31 20:58:22.195] Panic on CPU 0:
(XEN) [2015-03-31 20:58:22.208] Xen BUG at iommu_map.c:455
(XEN) [2015-03-31 20:58:22.223] ****************************************
(XEN) [2015-03-31 20:58:22.243] 
(XEN) [2015-03-31 20:58:22.252] Manual reset required ('noreboot' specified)


Haven't tried without the revert yet.

--
Sander


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