makedumpfile: Xen4: exclude domU pages for Xen4

Saving just the dom0 and Xen pages is a good idea because usually the crash can be analysed in dom0 and saving just the Xen and dom0 pages allows the machine to restart quickly.

makedumpfile needs to be modified to exclude domU pages when using Xen4 since the Xen implementation has changed. The Xen version can be determined in the kcore file and then either Xen3 or Xen4 functions are used. The other modifications are based on the goal of quickly finding the dom0 and Xen pages.

The domU page exclusion for Xen4 is implemented so far just for x86_64.

The kvtop_xen_x86_64 modification for a faster method to run through the page
table (last_p.._read) was seen in the crash utility source code.

 arch/x86_64.c  |  244 ++++++++++++++++++++++++++++----------
 elf_info.c     |    2 +
 makedumpfile.c |  362 ++++++++++++++++++++++++++++++++++++++++++++++++++++----
 makedumpfile.h |   79 +++++++++++--
 4 files changed, 591 insertions(+), 96 deletions(-)

With kind regards

Norbert Trapp
PDG ES&S SWE OS 6

FUJITSU
Fujitsu Technology Solutions GmbH
Domagkstrasse 28, D-80807 Muenchen, Germany
E-mail: Norbert.Trapp@xxxxxxxxxxxxxx
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Hello Norbert,

Thank you for your work.

But, I don't know much about Xen, so I want to ask for help from Zhangfengwei and other experts in Xen.

Thanks
Atsushi Kumagai

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