This is a note to let you know that I've just added the patch titled
MCE: Fix vm86 handling for 32bit mce handler
to the 3.3-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary
The filename of the patch is:
mce-fix-vm86-handling-for-32bit-mce-handler.patch
and it can be found in the queue-3.3 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <[email protected]> know about it.
>From a129a7c84582629741e5fa6f40026efcd7a65bd4 Mon Sep 17 00:00:00 2001
From: Andi Kleen <[email protected]>
Date: Fri, 19 Nov 2010 13:16:22 +0100
Subject: MCE: Fix vm86 handling for 32bit mce handler
From: Andi Kleen <[email protected]>
commit a129a7c84582629741e5fa6f40026efcd7a65bd4 upstream.
When running on 32bit the mce handler could misinterpret
vm86 mode as ring 0. This can affect whether it does recovery
or not; it was possible to panic when recovery was actually
possible.
Fix this by always forcing vm86 to look like ring 3.
Signed-off-by: Andi Kleen <[email protected]>
Signed-off-by: Tony Luck <[email protected]>
Signed-off-by: Greg Kroah-Hartman <[email protected]>
---
arch/x86/kernel/cpu/mcheck/mce.c | 8 ++++++++
1 file changed, 8 insertions(+)
--- a/arch/x86/kernel/cpu/mcheck/mce.c
+++ b/arch/x86/kernel/cpu/mcheck/mce.c
@@ -437,6 +437,14 @@ static inline void mce_gather_info(struc
if (m->mcgstatus & (MCG_STATUS_RIPV|MCG_STATUS_EIPV)) {
m->ip = regs->ip;
m->cs = regs->cs;
+
+ /*
+ * When in VM86 mode make the cs look like ring 3
+ * always. This is a lie, but it's better than passing
+ * the additional vm86 bit around everywhere.
+ */
+ if (v8086_mode(regs))
+ m->cs |= 3;
}
/* Use accurate RIP reporting if available. */
if (rip_msr)
Patches currently in stable-queue which might be from [email protected] are
queue-3.3/mce-fix-vm86-handling-for-32bit-mce-handler.patch
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