linux-kernel - Re: [PATCH -v5 0/4] x86, kdump: Fix crashkernel high with old kexec-tools

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Date:	Fri, 12 Apr 2013 16:07:27 -0400
From:	Vivek Goyal <vgoyal@...hat.com>
To:	"H. Peter Anvin" <hpa@...or.com>
Cc:	Thomas Gleixner <tglx@...utronix.de>, Ingo Molnar <mingo@...e.hu>,
	WANG Chao <chaowang@...hat.com>,
	"Eric W. Biederman" <ebiederm@...ssion.com>,
	linux-kernel@...r.kernel.org, Yinghai Lu <yinghai@...nel.org>
Subject: Re: [PATCH -v5 0/4] x86, kdump: Fix crashkernel high with old
 kexec-tools

Hi hpa,

Can you please consider including these patches for 3.9. Today, another
kdump user ran into issues when he tried to use latest kernel (3.9-rcx)
with existing kexec-tools. Obiviously kernel loading failed due to
crashkernel memory being reserved too high.

Thanks
Vivek

On Thu, Apr 11, 2013 at 11:54:47PM -0700, Yinghai Lu wrote:
> Vivek found some problems with old kexec-tools.
> 
> We keep the old crashkernel=X to old behavoir, so it will not break
> old kexec-tools.
> Add crashkernel=X,high to support new kexec-tools that supports loading high.
> when high is used, memblock will search from top to low.
> if the allocated one is above 4G, kernel will try to auto allocate
> 72M under 4G for swiotlb.
> user could crashkernel=Y,low to change 72M to other value.
> 
> -v2:	reorder the patch sequences
> 	crashkernel=X,high, crashkernel=Y,low only handle simple form.
> 	crashkernel=X will override crashkernel=X;high crashkernel=Y;low
> -v3:	update description in kernel-parameters.txt
> 	update get_last_crashkernel and _simple checking about suffix.
> -v4:	update to use ,high again, and also not abuse parse_crashkernel_simple
> -v5:	tight checking about crashkernel=X,highextra,high
> 
> Thanks
> 
> Yinghai
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