tree eaafaf68156f9f2f1a2af8a7ffed95653fea8aa5
parent 4bfaaef01a1badb9e8ffb0c0a37cd2379008d21f
author Magnus Damm <magnus@valinux.co.jp> 1159260758 +0200
committer Andi Kleen <andi@basil.nowhere.org> 1159260758 +0200

[PATCH] i386: Avoid overwriting the current pgd (V4, i386)

kexec: Avoid overwriting the current pgd (V4, i386)

This patch upgrades the i386-specific kexec code to avoid overwriting the
current pgd. Overwriting the current pgd is bad when CONFIG_CRASH_DUMP is used
to start a secondary kernel that dumps the memory of the previous kernel.

The code introduces a new set of page tables. These tables are used to provide
an executable identity mapping without overwriting the current pgd.

Signed-off-by: Magnus Damm <magnus@valinux.co.jp>
Signed-off-by: Andi Kleen <ak@suse.de>