Re: [Xen-devel] [PATCH 1/2] xen/mce: Add mcelog support for Xen platform

[Konrad Rzeszutek Wilk <konrad.wilk@xxxxxxxxxx>]

On Thu, May 31, 2012 at 12:57:44PM +0000, Liu, Jinsong wrote:
> >From 1a7951d6ca01d7f2c9dd2bdb6de5f8e7fdcb8bbd Mon Sep 17 00:00:00 2001
> From: root <root@xxxxxxxxxxxxxxxxxxxxxx>
> Date: Fri, 1 Jun 2012 03:12:51 +0800
> Subject: [PATCH 1/2] xen/mce: Add mcelog support for Xen platform
> 
> When MCA error occurs, it would be handled by Xen hypervisor first,
> and then the error information would be sent to initial domain for logging.
> 
> This patch gets error information from Xen hypervisor and convert
> Xen format error into Linux format mcelog. This logic is basically
> self-contained, not touching other kernel components.
> 
> By using tools like mcelog tool users could read specific error information,
> like what they did under native Linux.
> 
> To test follow directions outlined in Documentation/acpi/apei/einj.txt

[   53.264610] switch: port 1(eth0) entered forwarding state
[ 1058.051938] BUG: sleeping function called from invalid context at 
/home/konrad/linux/include/linux/kernel.h:199
[ 1058.052066] in_atomic(): 1, irqs_disabled(): 0, pid: 4552, name: mcelog
[ 1058.052130] Pid: 4552, comm: mcelog Tainted: G           O 
3.5.0-rc1upstream-00041-ga16e594-dirty #2
[ 1058.052235] Call Trace:
[ 1058.052291]  [<ffffffff8109ad9a>] __might_sleep+0xda/0x100
[ 1058.052349]  [<ffffffff8132a55b>] xen_mce_chrdev_read+0xab/0x140
[ 1058.052408]  [<ffffffff81148d85>] vfs_read+0xc5/0x190
[ 1058.052461]  [<ffffffff81148f4c>] sys_read+0x4c/0x90
[ 1058.052515]  [<ffffffff815bdd79>] system_call_fastpath+0x16/0x1

?

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