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authorAndi Kleen <ak@suse.de>2007-07-22 11:12:31 +0200
committerLinus Torvalds <torvalds@woody.linux-foundation.org>2007-07-22 11:03:37 -0700
commit19d36ccdc34f5ed444f8a6af0cbfdb6790eb1177 (patch)
tree39942efb826f2793692da60b04fc0e7b015fa23d /include/asm-x86_64
parentf51c94528a9bc73504928926ca4d791a2b7ddd7c (diff)
downloadlinux-19d36ccdc34f5ed444f8a6af0cbfdb6790eb1177.tar.gz
x86: Fix alternatives and kprobes to remap write-protected kernel text
Reenable kprobes and alternative patching when the kernel text is write protected by DEBUG_RODATA Add a general utility function to change write protected text. The new function remaps the code using vmap to write it and takes care of CPU synchronization. It also does CLFLUSH to make icache recovery faster. There are some limitations on when the function can be used, see the comment. This is a newer version that also changes the paravirt_ops code. text_poke also supports multi byte patching now. Contains bug fixes from Zach Amsden and suggestions from Mathieu Desnoyers. Cc: Jan Beulich <jbeulich@novell.com> Cc: Jeremy Fitzhardinge <jeremy@goop.org> Cc: Mathieu Desnoyers <compudj@krystal.dyndns.org> Cc: Zach Amsden <zach@vmware.com> Signed-off-by: Andi Kleen <ak@suse.de> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'include/asm-x86_64')
-rw-r--r--include/asm-x86_64/alternative.h2
-rw-r--r--include/asm-x86_64/pgtable.h2
2 files changed, 4 insertions, 0 deletions
diff --git a/include/asm-x86_64/alternative.h b/include/asm-x86_64/alternative.h
index eea7aecfac7..ab161e81015 100644
--- a/include/asm-x86_64/alternative.h
+++ b/include/asm-x86_64/alternative.h
@@ -154,4 +154,6 @@ apply_paravirt(struct paravirt_patch *start, struct paravirt_patch *end)
#define __parainstructions_end NULL
#endif
+extern void text_poke(void *addr, unsigned char *opcode, int len);
+
#endif /* _X86_64_ALTERNATIVE_H */
diff --git a/include/asm-x86_64/pgtable.h b/include/asm-x86_64/pgtable.h
index 60cff1e4f7a..c9d8764c89d 100644
--- a/include/asm-x86_64/pgtable.h
+++ b/include/asm-x86_64/pgtable.h
@@ -403,6 +403,8 @@ extern struct list_head pgd_list;
extern int kern_addr_valid(unsigned long addr);
+pte_t *lookup_address(unsigned long addr);
+
#define io_remap_pfn_range(vma, vaddr, pfn, size, prot) \
remap_pfn_range(vma, vaddr, pfn, size, prot)