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* SMMU, Unhandled context fault
@ 2016-04-25  8:54 Peng Fan
  2016-04-26 10:28 ` Julien Grall
  0 siblings, 1 reply; 18+ messages in thread
From: Peng Fan @ 2016-04-25  8:54 UTC (permalink / raw)
  To: xen-devel, julien.grall; +Cc: van.freenix, sstabellini

Hi Julien, Stefano

I met an issue when passthrough a device to DomU, and have no clear idea what's wrong.
"
(XEN) smmu: /iommu@5c800000: Unhandled context fault: iova=0x42188000, fsynr=0x433, cb=0
(XEN) smmu: /iommu@5c800000: Unhandled context fault: iova=0x42188020, fsynr=0x433, cb=0
"
fsynr is 0x433, PTWF is 1, which means
"An external fault occurred while processing a translation table walk"

My DomU cfg is:
"
kernel = "/root/xen/Image"
device_tree = "/root/xen/sdhc.dtb"
dtdev = [ "/usdhc@5a240000" ]
iomem = [ "0x5a240,0x10@0x1a240"]
irqs = [ 257 ]
memory = "128"
name = "domU-sdhc-test"
vcpus = 1
serial="pty"
disk = [ 'phy:/dev/loop0,xvda,w' ]
extra = "console=hvc0 root=/dev/xvda debug=/bin/sh"
"

I saw this patch: http://www.gossamer-threads.com/lists/xen/devel/428030
"xen/arm: Force broadcast of TLB and instruction cache maintenance instructions"
So I guess should we have a similar fix for SMMU TLB?
From my failure log, It should be that TCU can not find the machine address for iova(guest physical address).
I remember that When create domU for ARM, the memory is allocated from heap, so machine pages
should be there allocated. Also SMMU share the mmu table with domU mmu table.
I guess there maybe something wrong with SMMU TLB related handling. But I have no
clear idea on this. Please advise.

Thanks in advance,
Peng.

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^ permalink raw reply	[flat|nested] 18+ messages in thread

end of thread, other threads:[~2016-05-08 11:52 UTC | newest]

Thread overview: 18+ messages (download: mbox.gz / follow: Atom feed)
-- links below jump to the message on this page --
2016-04-25  8:54 SMMU, Unhandled context fault Peng Fan
2016-04-26 10:28 ` Julien Grall
2016-04-26 11:50   ` Peng Fan
2016-04-26 13:12     ` Edgar E. Iglesias
2016-04-26 13:56       ` Peng Fan
2016-04-26 14:30         ` Edgar E. Iglesias
2016-04-27  2:02           ` Peng Fan
2016-04-27  9:58             ` Julien Grall
2016-04-28  2:37               ` Peng Fan
2016-04-28  6:39                 ` Peng Fan
2016-04-28 10:27                   ` Julien Grall
2016-04-28 12:56                     ` Peng Fan
2016-04-28 13:14                       ` Julien Grall
2016-04-29 14:28                         ` Peng Fan
2016-05-03 10:58                           ` Julien Grall
2016-05-03 13:58                             ` Peng Fan
2016-05-06 12:48                               ` Julien Grall
2016-05-08 11:52                                 ` Peng Fan

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