On Fri, Dec 21, 2007 at 03:33:19PM +0800, Huang, Ying wrote:
[..]
> The following user-space tools can be used with kexec jump.
>
> 1. kexec-tools needs to be patched to support kexec jump. The patches
> and the precompiled kexec can be download from the following URL:
> source: http://khibernation.sourceforge.net/download/release_v8/kexec-tools/kexec-tools-src_git_kh8.tar.bz2
> patches: http://khibernation.sourceforge.net/download/release_v8/kexec-tools/kexec-tools-patches_git_kh8.tar.bz2
> binary: http://khibernation.sourceforge.net/download/release_v8/kexec-tools/kexec_git_kh8
>
> 2. makedumpfile with patches are used as memory image saving tool, it
> can exclude free pages from original kernel memory image file. The
> patches and the precompiled makedumpfile can be download from the
> following URL:
> source: http://khibernation.sourceforge.net/download/release_v8/makedumpfile/makedumpfile-src_cvs_kh8.tar.bz2
> patches: http://khibernation.sourceforge.net/download/release_v8/makedumpfile/makedumpfile-patches_cvs_kh8.tar.bz2
> binary: http://khibernation.sourceforge.net/download/release_v8/makedumpfile/makedumpfile_cvs_kh8
>
> 3. A simplest memory image restoring tool named "krestore" is
> implemented. It can be downloaded from the following URL:
> source: http://khibernation.sourceforge.net/download/release_v8/krestore/krestore-src_cvs_kh8.tar.bz2
> binary: http://khibernation.sourceforge.net/download/release_v8/krestore/krestore_cvs_kh8
>
> An initramfs image can be used as the root file system of kexeced
> kernel. An initramfs image built with "BuildRoot" can be downloaded
> from the following URL:
> initramfs image: http://khibernation.sourceforge.net/download/release_v8/initramfs/rootfs_cvs_kh8.gz
> All user space tools above are included in the initramfs image.
>
>
> Usage example of jumping between original and kexeced kernel:
>
> 1. Compile and install patched kernel with following options selected:
>
> CONFIG_X86_32=y
> CONFIG_RELOCATABLE=y
> CONFIG_KEXEC=y
> CONFIG_CRASH_DUMP=y
> CONFIG_PM=y
>
> 2. Build an initramfs image contains kexec-tool, or download the
> pre-built initramfs image, called rootfs.gz in following text.
>
> 3. Boot kernel compiled in step 1.
>
> 4. Load kernel compiled in step 1 with /sbin/kexec. If You want to use
> "krestore" tool, the --elf64-core-headers should be specified in
> command line of /sbin/kexec. The shell command line can be as
> follow:
>
> /sbin/kexec --load-jump-back /boot/bzImage --mem-min=0x100000
> --mem-max=0xffffff --elf64-core-headers --initrd=rootfs.gz
>
> 5. Boot the kexeced kernel with following shell command line:
>
> /sbin/kexec -e
>
> 6. The kexeced kernel will boot as normal kexec. In kexeced kernel the
> memory image of original kernel can read via /proc/vmcore or
> /dev/oldmem, and can be written via /dev/oldmem. You can
> save/restore/modify it as you want to.
>
> 7. Prepare jumping back from kexeced kernel with following shell
> command lines:
>
> jump_back_entry=`cat /proc/cmdline | tr ' ' '\n' | grep kexec_jump_back_entry | cut -d '='`
> /sbin/kexec --load-jump-back-helper=$jump_back_entry
>
> 8. Jump back to the original kernel with following shell command line:
>
> /sbin/kexec -e
>
> 9. Now, you are in the original kernel again. You can read/write the
> memory image of kexeced kernel via /proc/kimgcore.
>
Why do we need two interfaces, /proc/vmcore and /proc/kimgcore? Can't
we have just one say /proc/vmcore. Irrespective of what kernel you are
in /proc/vmcore gives you the access to the memory of kernel which was
previously booted.
Thanks
Vivek
--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to [email protected]
More majordomo info at http://vger.kernel.org/majordomo-info.html
Please read the FAQ at http://www.tux.org/lkml/
[Index of Archives]
[Kernel Newbies]
[Netfilter]
[Bugtraq]
[Photo]
[Stuff]
[Gimp]
[Yosemite News]
[MIPS Linux]
[ARM Linux]
[Linux Security]
[Linux RAID]
[Video 4 Linux]
[Linux for the blind]
[Linux Resources]
