diff options
| author |   Andi Kleen <ak@suse.de> | 2007-07-22 11:12:32 +0200 |
|---|---|---|
| committer |   Linus Torvalds <torvalds@woody.linux-foundation.org> | 2007-07-22 11:03:37 -0700 |
| commit | 8f4e956b313dcccbc7be6f10808952345e3b638c (patch) | |
| tree | cc8c93fa1faf5e0b608e3a21330a32bd82fe6f47 /include/asm-x86_64 | |
| parent | x86: Fix alternatives and kprobes to remap write-protected kernel text (diff) | |
| download | linux-dev-8f4e956b313dcccbc7be6f10808952345e3b638c.tar.xz linux-dev-8f4e956b313dcccbc7be6f10808952345e3b638c.zip | |
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.h | 3 | ||||
| -rw-r--r-- | include/asm-x86_64/nmi.h | 2 |
2 files changed, 5 insertions, 0 deletions
diff --git a/include/asm-x86_64/mce.h b/include/asm-x86_64/mce.h index 556be5563e30..7bc030a1996d 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 d0a7f53b1497..5fb3c0de5ccc 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 */ |