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authorAndi Kleen <ak@suse.de>2007-08-10 16:31:03 -0400
committerLinus Torvalds <torvalds@woody.linux-foundation.org>2007-08-11 18:58:13 -0400
commitab144f5ec64c42218a555ec1dbde6b60cf2982d6 (patch)
treee3a4532e1db116e87060c9b18f4cfbf6258fdba3 /include/asm-i386/emergency-restart.h
parentd3f3c9346979bfa074c64eac5fc3ed5bba4f40ed (diff)
i386: Make patching more robust, fix paravirt issue
Commit 19d36ccdc34f5ed444f8a6af0cbfdb6790eb1177 "x86: Fix alternatives and kprobes to remap write-protected kernel text" uses code which is being patched for patching. In particular, paravirt_ops does patching in two stages: first it calls paravirt_ops.patch, then it fills any remaining instructions with nop_out(). nop_out calls text_poke() which calls lookup_address() which calls pgd_val() (aka paravirt_ops.pgd_val): that call site is one of the places we patch. If we always do patching as one single call to text_poke(), we only need make sure we're not patching the memcpy in text_poke itself. This means the prototype to paravirt_ops.patch needs to change, to marshal the new code into a buffer rather than patching in place as it does now. It also means all patching goes through text_poke(), which is known to be safe (apply_alternatives is also changed to make a single patch). AK: fix compilation on x86-64 (bad rusty!) AK: fix boot on x86-64 (sigh) AK: merged with other patches Signed-off-by: Rusty Russell <rusty@rustcorp.com.au> Signed-off-by: Andi Kleen <ak@suse.de> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'include/asm-i386/emergency-restart.h')
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