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authorAndi Kleen <ak@suse.de>2007-07-22 11:12:32 +0200
committerLinus Torvalds <torvalds@woody.linux-foundation.org>2007-07-22 11:03:37 -0700
commit8f4e956b313dcccbc7be6f10808952345e3b638c (patch)
treecc8c93fa1faf5e0b608e3a21330a32bd82fe6f47 /include/asm-x86_64
parent19d36ccdc34f5ed444f8a6af0cbfdb6790eb1177 (diff)
downloadlinux-8f4e956b313dcccbc7be6f10808952345e3b638c.tar.gz
x86: Stop MCEs and NMIs during code patching
When a machine check or NMI occurs while multiple byte code is patched the CPU could theoretically see an inconsistent instruction and crash. Prevent this by temporarily disabling MCEs and returning early in the NMI handler. Based on discussion with Mathieu Desnoyers. Cc: Mathieu Desnoyers <compudj@krystal.dyndns.org> Cc: Jeremy Fitzhardinge <jeremy@goop.org> 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/mce.h3
-rw-r--r--include/asm-x86_64/nmi.h2
2 files changed, 5 insertions, 0 deletions
diff --git a/include/asm-x86_64/mce.h b/include/asm-x86_64/mce.h
index 556be5563e3..7bc030a1996 100644
--- a/include/asm-x86_64/mce.h
+++ b/include/asm-x86_64/mce.h
@@ -107,6 +107,9 @@ extern void do_machine_check(struct pt_regs *, long);
extern int mce_notify_user(void);
+extern void stop_mce(void);
+extern void restart_mce(void);
+
#endif
#endif
diff --git a/include/asm-x86_64/nmi.h b/include/asm-x86_64/nmi.h
index d0a7f53b149..5fb3c0de5cc 100644
--- a/include/asm-x86_64/nmi.h
+++ b/include/asm-x86_64/nmi.h
@@ -88,5 +88,7 @@ unsigned lapic_adjust_nmi_hz(unsigned hz);
int lapic_watchdog_ok(void);
void disable_lapic_nmi_watchdog(void);
void enable_lapic_nmi_watchdog(void);
+void stop_nmi(void);
+void restart_nmi(void);
#endif /* ASM_NMI_H */