linux-kernel - Re: [PATH 0/1] Kexec jump - v2 - the first step to kexec based hibernation

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Date:	Wed, 01 Aug 2007 09:34:31 +0800
From:	"Huang, Ying" <ying.huang@...el.com>
To:	Pavel Machek <pavel@....cz>
Cc:	"Eric W. Biederman" <ebiederm@...ssion.com>,
	nigel@...el.suspend2.net, "Rafael J. Wysocki" <rjw@...k.pl>,
	Jeremy Maitin-Shepard <jbms@....edu>,
	Alan Stern <stern@...land.harvard.edu>,
	Andrew Morton <akpm@...ux-foundation.org>, david@...g.hm,
	linux-kernel@...r.kernel.org, linux-pm@...ts.linux-foundation.org,
	Kexec Mailing List <kexec@...ts.infradead.org>
Subject: Re: [PATH 0/1] Kexec jump - v2 - the first step to kexec based
	hibernation

On Tue, 2007-07-31 at 13:04 +0200, Pavel Machek wrote:
> Hi!
> 
> > 3. Boot kernel compiled for normal usage, the reserved crash kernel
> >    memory region must be added to kernel command line as following:
> > 
> >    crashkernel=<XX>M@<XX>M
> > 
> >    Where, <XX> should be replaced by the real memory size and
> > position.
> 
> I used crashkernel=64M@64M .
> 
> 
> > 4. Load kernel compiled for hibernating usage as a crashdump kernel
> >    with kexec, the same kernel as that of 3 can be used if
> >    CONFIG_RELOCATABLE=y is selected. The kernel command line option as
> >    following must be appended to kernel command line.
> > 
> >    kexec_jump_buf_pfn=`cat /sys/kernel/kexec_jump_buf_pfn`
> > 
> >    For example, the shell command line can be as follow:
> > 
> >    kexec -p /boot/vmlinux --args-linux --append="root=/dev/hdb signal
> >        kexec_jump_buf_pfn=`cat /sys/kernel/kexec_jump_buf_pfn`"
> 
> I think I followed the instructions closely. Now I'm trying to do 
> 
> kexec -p /data/l/linux/vmlinux --args-linux --append="init=/bin/bash
> kexec_jump_buf_pfn=`cat /sys/kernel/kexec_jump_buf_pfn`"
> 
> but it tells me:
> 
> Invalid memory segment 0x100000 - 0x7a0fff
> 
> (and nothing in dmesg) 
> 
> If I try to load bzImage (corresponding to vmlinux I tried to use),  I
> get:
> 
> root@amd:~# kexec -p /data/l/linux/arch/i386/boot/bzImage --append="init=/bin/bash kexec_jump_buf_pfn=`cat /sys/kernel/kexec_jump_buf_pfn`"
> Could not find a free area of memory of 9000 bytes...
> locate_hole failed
> root@amd:~#
> 
> What am I doing wrong?

The kexec-tools version 1.101 does not work perfectly with relocatable
kernel. This would have been solved if I worked against kexec-tools
testing tree. I will work against testing tree in the next version.

But, with some trick, it can work. When configure kernel, make sure the
following option is set:

CONFIG_PHYSICAL_START=0x4000000 # if crashkernel=<XX>M@64M

Best Regards,
Huang Ying
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