From mboxrd@z Thu Jan  1 00:00:00 1970
From: Akio Takebe <takebe_akio@jp.fujitsu.com>
Subject: [Patch] Enable "sysrq c" handler for domU coredump
Date: Tue, 01 Aug 2006 12:11:26 +0900
Message-ID: <4DC6B5182D2981takebe_akio@jp.fujitsu.com>
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To: xen-devel <xen-devel@lists.xensource.com>, Horms <horms@verge.net.au>, Kouya Shimura <kouya@jp.fujitsu.com>
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Hi,

In the case of linux, crash_kexec() is occured by "sysrq c".
In the case of DomainU on xen, Help is occured by "sysrq c" now.
So The way of dumping DomainU's memory manualy is nothing.

I fix this issue by the following way.
1. Panic is occured by "sysrq c" on both Domain0 and DomainU.
2. On DomainU, coredump is generated in /var/xen/dump (on Domain0).
   On Domain0, crash_kexec() is called by panic() if implemented.

I tested the below.
1. vi /etc/xen/xend-config.sxp
   (enabel-dump yes)
2. xm create -c domU
   echo 1 >/proc/sys/kernel/sysrq (on domU)
3. xm sysrq domU c (on dom0)
4. ls -lh /var/xen/dump

Signed-off-by: Akio Takebe <takebe_akio@jp.fujitsu.com>
Signed-off-by: Kouya Shimura <kouya@jp.fujitsu.com>

Best Regards,

Akio Takebe

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