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[Xen-users] How to dump DomU debug infos -- Stack-trace / earlyprintk

  • To: "xen-users@xxxxxxxxxxxxx" <xen-users@xxxxxxxxxxxxx>
  • From: Tom Ting[丁郁庭] <tom_ting@xxxxxxxxxxx>
  • Date: Fri, 18 Dec 2015 01:55:37 +0000
  • Accept-language: zh-TW, en-US
  • Authenticated-by:
  • Delivery-date: Fri, 18 Dec 2015 01:57:00 +0000
  • List-id: Xen user discussion <xen-users.lists.xen.org>
  • Thread-index: AdE5NJtt4S/CEklKTmeAwkHh8JDIyw==
  • Thread-topic: How to dump DomU debug infos -- Stack-trace / earlyprintk

Hi All


I am currently working on DomU kernel with some passthrough-drivers / hacking based on ARM A53 platform.

There are some time that the DomU kernel is ruined too early before xenconsole could connect to start emit error log.

I will need the whole stack dump / earlyprintk log to check what is going on at boot time.

Here are my questions and I will really appreciate if someone could help :)


1. Is earlyprintk works on DomU?? I tried to add following config but it doesn’t seems to work.

extra = "earlyprintk=xenboot console=hvc0 debug"


2. Is there existing console logging system for DomU, recording all the console log (basically kernel) to Dom0 file system?


3. I use the tool xenctx, trying to dump vcpu info for checking error status. But it seems stack dump isn’t working which I would like

to use it for checking the call-trace for finding out the point DomU is getting trouble. The output on my board is like following :


root@buildroot-Dom0:$ /usr/local/lib/xen/bin/xenctx -S -a -s System.map 5

PC:       ffffffc0102cdf48 __delay+0x28

LR:       ffffffc0102cdf7c

ELR_EL1:  0000000000000000

CPSR:     80000045

SPSR_EL1: 00000000

SP_EL0:   0000000000000000

SP_EL1:   ffffffc010813e40


x0: 0000000000000199    x1: 0000011bb3021e7f    x2: 0000011bb3021df8

x3: 0000000000000003    x4: 000000000000001d    x5: 0000000000000006

x6: ffffffc010879149    x7: 000000000000001e    x8: 6f6d656d20666f20

x9: ffffffc010813bc0   x10: 000000000000001d   x11: ffffffc010824000

x12: 0101010101010101   x13: 0000000000000028   x14: 0ffffffffffffffe

x15: ffffffc01089fe48   x16: 0000000000000000   x17: 00000000ffffffff

x18: 00000000000000ad   x19: 000000000000002a   x20: 00000000b111c644

x21: 00000000b111c6a8   x22: ffffffc010875000   x23: 0000000000000001

x24: 0000000080000200   x25: ffffffc01081e000   x26: 00000000408cd000

x27: ffffffc010081220   x28: 0000000000000000   x29: ffffffc010813e40


SCTLR: 34d5d91d

TTBCR: 00000032b5193519

TTBR0: 000000004ffff000

TTBR1: 00000000408cd000




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