Re: [Crash-utility] [PATCH] xen: Add support for dom0 with Linux kernel 3.19 and newer

Hi Dave, Sorry for delay but I have missed your email. On Thu, Jan 21, 2016 at 04:34:15PM -0500, Dave Anderson wrote: > > ----- Original Message ----- > > > > Linux kernel commit 054954eb051f35e74b75a566a96fe756015352c8 > > (xen: switch to linear virtual mapped sparse p2m list), which > > appeared in 3.19, introduced linear virtual mapped sparse p2m > > list. If readmem() reads p2m then it access this list using > > physical addresses. Sadly, VMA to physical address translation > > in crash requires access to p2m list. This means that we have > > a chicken and egg problem. In general this issue must be solved > > by introducing some changes in libxl, Linux kernel and crash > > (I have added this task to my long TODO list). However, in dom0 > > case we can use crash_xen_info_t.dom0_pfn_to_mfn_frame_list_list > > which is available out of the box. So, let's use it and make > > at least some users happy. > > > > Signed-off-by: Daniel Kiper <daniel.kiper(a)oracle.com&gt; > > Hi Daniel, > > Can you help me out with a consise changelog entry? As I understand > it, the crash utility has not supported Xen dom0 and domU dumpfiles > since the referenced 3.19 commit, and this patch resurrects support > for dom0 dumpfiles only. Are there issues with live system analysis Exactly!

> as well? I am not sure what do you mean by that. If you are asking about crash commands then it looks that after my fix everything works as expected.

> And without the patch, what is the final, fatal error message? Here it is: crash 7.1.4 Copyright (C) 2002-2015 Red Hat, Inc. Copyright (C) 2004, 2005, 2006, 2010 IBM Corporation Copyright (C) 1999-2006 Hewlett-Packard Co Copyright (C) 2005, 2006, 2011, 2012 Fujitsu Limited Copyright (C) 2006, 2007 VA Linux Systems Japan K.K. Copyright (C) 2005, 2011 NEC Corporation Copyright (C) 1999, 2002, 2007 Silicon Graphics, Inc. Copyright (C) 1999, 2000, 2001, 2002 Mission Critical Linux, Inc. This program is free software, covered by the GNU General Public License, and you are welcome to change it and/or distribute copies of it under certain conditions. Enter "help copying" to see the conditions. This program has absolutely no warranty. Enter "help warranty" for details. GNU gdb (GDB) 7.6 Copyright (C) 2013 Free Software Foundation, Inc. License GPLv3+: GNU GPL version 3 or later <http://gnu.org/licenses/gpl.html> This is free software: you are free to change and redistribute it. There is NO WARRANTY, to the extent permitted by law. Type "show copying" and "show warranty" for details. This GDB was configured as "x86_64-unknown-linux-gnu"... crash: cannot resolve "p2m_top" Daniel