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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 /arch/x86_64/kernel
parent19d36ccdc34f5ed444f8a6af0cbfdb6790eb1177 (diff)
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 'arch/x86_64/kernel')
-rw-r--r--arch/x86_64/kernel/mce.c14
-rw-r--r--arch/x86_64/kernel/nmi.c17
2 files changed, 30 insertions, 1 deletions
diff --git a/arch/x86_64/kernel/mce.c b/arch/x86_64/kernel/mce.c
index 4d8450ee363..a66d607f5b9 100644
--- a/arch/x86_64/kernel/mce.c
+++ b/arch/x86_64/kernel/mce.c
@@ -667,6 +667,20 @@ static struct miscdevice mce_log_device = {
&mce_chrdev_ops,
};
+static unsigned long old_cr4 __initdata;
+
+void __init stop_mce(void)
+{
+ old_cr4 = read_cr4();
+ clear_in_cr4(X86_CR4_MCE);
+}
+
+void __init restart_mce(void)
+{
+ if (old_cr4 & X86_CR4_MCE)
+ set_in_cr4(X86_CR4_MCE);
+}
+
/*
* Old style boot options parsing. Only for compatibility.
*/
diff --git a/arch/x86_64/kernel/nmi.c b/arch/x86_64/kernel/nmi.c
index edbbc59b752..cb8ee9d02f8 100644
--- a/arch/x86_64/kernel/nmi.c
+++ b/arch/x86_64/kernel/nmi.c
@@ -384,11 +384,14 @@ int __kprobes nmi_watchdog_tick(struct pt_regs * regs, unsigned reason)
return rc;
}
+static unsigned ignore_nmis;
+
asmlinkage __kprobes void do_nmi(struct pt_regs * regs, long error_code)
{
nmi_enter();
add_pda(__nmi_count,1);
- default_do_nmi(regs);
+ if (!ignore_nmis)
+ default_do_nmi(regs);
nmi_exit();
}
@@ -401,6 +404,18 @@ int do_nmi_callback(struct pt_regs * regs, int cpu)
return 0;
}
+void stop_nmi(void)
+{
+ acpi_nmi_disable();
+ ignore_nmis++;
+}
+
+void restart_nmi(void)
+{
+ ignore_nmis--;
+ acpi_nmi_enable();
+}
+
#ifdef CONFIG_SYSCTL
static int unknown_nmi_panic_callback(struct pt_regs *regs, int cpu)