[PATCH -mm] kexec jump -v9

Vivek Goyal vgoyal at redhat.com
Wed May 14 12:03:29 EDT 2008

On Thu, Mar 06, 2008 at 11:13:08AM +0800, Huang, Ying wrote:
> This is a minimal patch with only the essential features. All
> additional features are split out and can be discussed later. I think
> it may be easier to get consensus on this minimal patch.

Hi Huang,

Ok, after a long time, I am back to testing and reviewing this patch.

> 7. Boot kernel compiled in step 1 (kernel C). Use the rootfs.gz as
>    root file system.
> 8. In kernel C, load the memory image of kernel A as follow:
>    /sbin/kexec -l --args-none --entry=`cat kexec_jump_back_entry` dump.elf

How do I got back to original kernel without loading dump.elf. I mean,
original kernel is already in memory and I don't have to first save
it to disk and then reload back. Is there a way to do it? If not, then
we need to modify kexec-tools to support that.

Something like

kexec --entry=<entry point>, should tell kexec that kernel is already
loaded. Just do the bit to set the entry point properly.


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