[Crash-utility] [PATCH v2 0/7] Upgrade the remote access to a xen domain.
From: Don Slutz <dslutz(a)verizon.com>
Currently crash 4.0 and later using the code:
http://lists.xen.org/archives/html/xen-devel/2013-11/msg02569.html
There is some very limited documention on crashes remote ptotocol in:
http://lists.xen.org/archives/html/xen-devel/2013-11/msg02352.html
and some fixes in the attachment 0001-xen-crashd-Connect-crash-with-domain.patch
from the 1st link above.
How ever there are issues with the current code:
1) The remote protocol has a minor issue (which I have not been able to
happen) based on the fact TCP/IP is stream based protocol. This means
a RECV or a SEND may not do the fully requested size of data. In fact
the current code assumes that the amount of data that a SEND is called
with will all be read with a single RECV.
2) The most common mismatch between crash and older kernels is
phys_base. In the remote case, see if the remote server supports
vitrual memory access, and if so, see if phys_base can be retreived.
3) crash assumes that the remote system is active and can not return
currect IP and SP to do a better back trace.
4) enable a non-active mode of remote access.
This patch set attempts to fix these:
The fix for #1 I have called NIL mode (patch 1).
The fix for #2 uses get_remote_phys_base (patch 3).
The fix for #3 uses get_remote_regs (patch 5).
The fix for #4 uses special fake file /dev/xenmem (patch 7).
It also REMOTE_PAUSED() to indicate "remote paused system".
changes v1 to v2:
Daniel Kiper:
remove all camelCase.
remove Emacs directives.
Dave Anderson:
rework flags, and time of changes.
change get_remote_regs() to return non-zero when it successfully gets the registers.
fix "make warn" warnings
remove Emacs directives.
Don Slutz (7):
Add NIL mode to remote.
remote_proc_version: NULL terminate passed buffer on error.
Add get_remote_phys_base.
Add remote_vtop.
bt: get remote live registers if possible.
Add get_remote_cr3
Add support for non-live remote.
defs.h | 8 +-
kernel.c | 13 +-
memory.c | 13 +-
remote.c | 464 +++++++++++++++++++++++++++++++++++++++++++++++++++++----------
x86_64.c | 12 ++
5 files changed, 430 insertions(+), 80 deletions(-)
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1.8.4