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Sorry for the late reply. I was off
attending the Xen Developer Conference, and then testing out the
latest kexec code, and am just getting back to this,
On 10/23/13 12:37, Daniel Kiper wrote: I can see using gdbsx and gdb. However I have found crash to be easier in lots of cases. I could have used xg from here if I did not already have code based on xenctx.On Tue, Oct 22, 2013 at 07:03:19PM +0200, Daniel Kiper wrote:Hi, Sorry for late reply but I am very busy now. On Thu, Oct 17, 2013 at 03:25:25PM -0400, Don Slutz wrote:On 10/16/13 09:49, Petr Tesarik wrote:On Tue, 15 Oct 2013 12:02:51 -0400 Don Slutz <dslutz@xxxxxxxxxxx> wrote:I have some code that allows this. See the following mail thread: http://permalink.gmane.org/gmane.comp.emulators.xen.devel/174807 The questions are: 1. Does remote access have a specification? 2. Is it supported?I have never even made it to work. But since there's now some new use for it, I wouldn't object reviving the code.Good.3. Should the code be part of xen or crash?I think it should be part of xen, because it needs the xen development files, which would be a new dependency for the crash utility. Also, the development cycle is more aligned with xen than crash. Just my two cents, Petr TThat is why I started with it in xen. Not sure where it will end up.I do not know protocol details but I think that it is worth checking gdbsx tool from Xen (xen/tools/debugger/gdbsx) and gdb protocol spec (you could expose GDB interface from QEMU so it could be useful in HVM case). Maybe crash protocol is very similar or even identical with GDB protocol because a large part of crash is GDB itself. No problem.Ugh... I was in a hurry and forgot about final statement. Sorry for that. The only existing solution that I know of is:So we could just use existing solutions if they are compatible with protocol used by crash. Daniel xl dump-core <Domain> <filename>But this way does require disk space, and the delay while writing the file. For me it took ~2 minutes to write out a 3G core file. I also do not see the current registers being saved in the core file. -Don Slutz |
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