kernel.git/arch/x86/kernel/relocate_kernel_32.S, branch linux-2.6.28.y

kexec jump: check code size in control page

2008-08-15T15:35:42Z

Kexec/Kexec-jump require code size in control page is less than PAGE_SIZE/2. This patch add link-time checking for this. ASSERT() of ld link script is used as the link-time checking mechanism. [akpm@linux-foundation.org: build fix] Signed-off-by: Huang Ying Cc: Pavel Machek Cc: "Rafael J. Wysocki" Cc: "Eric W. Biederman" Acked-by: Vivek Goyal Cc: Ingo Molnar Signed-off-by: Andrew Morton Signed-off-by: Linus Torvalds

kexec jump

2008-07-26T19:00:04Z

This patch provides an enhancement to kexec/kdump. It implements the following features: - Backup/restore memory used by the original kernel before/after kexec. - Save/restore CPU state before/after kexec. The features of this patch can be used as a general method to call program in physical mode (paging turning off). This can be used to call BIOS code under Linux. 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_v10/kexec-tools/kexec-tools-src_git_kh10.tar.bz2 patches: http://khibernation.sourceforge.net/download/release_v10/kexec-tools/kexec-tools-patches_git_kh10.tar.bz2 binary: http://khibernation.sourceforge.net/download/release_v10/kexec-tools/kexec_git_kh10 Usage example of calling some physical mode code and return: 1. Compile and install patched kernel with following options selected: CONFIG_X86_32=y CONFIG_KEXEC=y CONFIG_PM=y CONFIG_KEXEC_JUMP=y 2. Build patched kexec-tool or download the pre-built one. 3. Build some physical mode executable named such as "phy_mode" 4. Boot kernel compiled in step 1. 5. Load physical mode executable with /sbin/kexec. The shell command line can be as follow: /sbin/kexec --load-preserve-context --args-none phy_mode 6. Call physical mode executable with following shell command line: /sbin/kexec -e Implementation point: To support jumping without reserving memory. One shadow backup page (source page) is allocated for each page used by kexeced code image (destination page). When do kexec_load, the image of kexeced code is loaded into source pages, and before executing, the destination pages and the source pages are swapped, so the contents of destination pages are backupped. Before jumping to the kexeced code image and after jumping back to the original kernel, the destination pages and the source pages are swapped too. C ABI (calling convention) is used as communication protocol between kernel and called code. A flag named KEXEC_PRESERVE_CONTEXT for sys_kexec_load is added to indicate that the loaded kernel image is used for jumping back. Now, only the i386 architecture is supported. Signed-off-by: Huang Ying Acked-by: Vivek Goyal Cc: "Eric W. Biederman" Cc: Pavel Machek Cc: Nigel Cunningham Cc: "Rafael J. Wysocki" Cc: Ingo Molnar Cc: Thomas Gleixner Signed-off-by: Andrew Morton Signed-off-by: Linus Torvalds

x86: relocate_kernel - use predefined macroses for page attributes

2008-04-17T15:41:29Z

Signed-off-by: Cyrill Gorcunov Signed-off-by: Ingo Molnar

x86: relocate_kernel - use predefined macroses for processor state

2008-04-17T15:41:29Z

Signed-off-by: Cyrill Gorcunov Signed-off-by: Ingo Molnar

x86: relocate_kernel - use PAGE_SIZE instead of numeric constant

2008-04-17T15:41:29Z

Signed-off-by: Cyrill Gorcunov Signed-off-by: Ingo Molnar

x86: relocate_kernel_32.S - clear register in more elegant way

2008-04-17T15:41:29Z

Signed-off-by: Cyrill Gorcunov Signed-off-by: Ingo Molnar

x86: relocate_kernel - use predefined PAGE_SIZE instead of own alias

2008-04-17T15:41:21Z

This patch does clean up relocate_kernel_(32|64).S a bit by getting rid of local PAGE_ALIGNED macro. We should use well-known PAGE_SIZE instead Signed-off-by: Cyrill Gorcunov Signed-off-by: Ingo Molnar

i386: move kernel

2007-10-11T09:17:01Z

Signed-off-by: Thomas Gleixner Signed-off-by: Ingo Molnar