Hi Dave, The attached patch enables to analyze dom0 linux from whole memory dump on IA64. (for crash-4.0-4.1) It is just quick hack. (I was asked from IA64 Xen developers and made it.) Each domain manages own machine memory by domain.arch.mm.pgd in IA64. It is 3-level page table. I thougnt the mfn of domain.arch.mm.pgd can be regarded as p2m_mfn. I intended to modify as less existent code as possible. But this patch is a bit tricky. And the memory usage is large if the machine memory layout is sparse. (maybe xen_kdump_p2m should be prepare for each arch ?) Would you consider to support dom0 analysis for IA64 ? I prepared two sample dumps. Please find from the following URLs. 1) http://people.valinux.co.jp/~oda/20070510-sample-dump-1.tar contents: - vmcore.gz This is taken by a hard assist dump. netdump style ELF vmcore. So XEN_ELFNOTE_CRASH_INFO does not exist. - vmcore.ka.gz It is coverted to kdump style and added XEN_ELFNOTE_CRASH_INFO manually. - vmlinux.debug.gz for dom0 analysis - xen-syms-2.6.18-8.el5.gz for xencrash To get p2m_mfn, xencrash's doms command is usefull. -------------------------------------------------------------------------- # crash xen-syms-2.6.18-8.el5 vmcore ... crash> doms DID DOMAIN ST T MAXPAGE TOTPAGE VCPU SHARED_I P2M_MFN 32753 f000000007ac8080 RU O 0 0 0 0 ---- 32754 f000000007acc080 RU X 0 0 0 0 ---- > 32767 f000000007ff8080 RU I 0 0 4 0 ---- 0 f000000007aa4080 RU 0 10000 fc28 1 f000000007a88000 1abb7 >* 1 f000000007a78080 RU U 10603 10603 3 f000000007a5c000 1a909 crash> ---------------------------------------------------------------------------- Then normal crash session with --p2m_mfn option. ---------------------------------------------------------------------------- # crash --p2m_mfn=1abb7 vmlinux.debug vmcore ... ---------------------------------------------------------------------------- vmcore.ka has XEN_ELFNOTE_CRASH_INFO. so --p2m_mfn option not need. ---------------------------------------------------------------------------- # crash vmlinux.debug vmcore.ka ... ---------------------------------------------------------------------------- --p2m_mfn option is effective only if a vmcore has XEN_ELFNOTE_CRASH_INFO now. I think specifying --p2m_mfn option is regarded as the vmcore is XEN_CORE_DUMPFILE(). The patch supports this. I think it is necessary for dumps which does not have XEN_ELFNOTE_CRASH_INFO such as above sample. 2) http://people.valinux.co.jp/~oda/20070510-sample-dump-2.tar contents: - vmcore.tiger.iomem_machine.gz taken by Xen kdump - vmlinux-xen-ia64.bz2 - xen-syms-ia64.bz2 I asked Xen kdump developper (simon@valinux) to add "p2m_mfn" to XEN_ELFNOTE_CRASH_INFO. So this change of Xen kdump is not open yet. If this is OK for crash, it will be commited. Thanks. -- Itsuro ODA <oda@xxxxxxxxxxxxx>
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