linux-kernel - [ 11/45] ARM: KVM: clear exclusive monitor on all exception returns

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Message-Id: <20130818203621.775512750@linuxfoundation.org>
Date:	Sun, 18 Aug 2013 13:36:00 -0700
From:	Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:	linux-kernel@...r.kernel.org
Cc:	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	stable@...r.kernel.org, Marc Zyngier <marc.zyngier@....com>,
	Christoffer Dall <christoffer.dall@...aro.org>,
	Jonghwan Choi <jhbird.choi@...sung.com>
Subject: [ 11/45] ARM: KVM: clear exclusive monitor on all exception returns

3.10-stable review patch.  If anyone has any objections, please let me know.

------------------

From: Marc Zyngier <marc.zyngier@....com>

commit 22cfbb6d730ca2fda236b507d9fba17bf002736c upstream.

Make sure we clear the exclusive monitor on all exception returns,
which otherwise could lead to lock corruptions.

Signed-off-by: Marc Zyngier <marc.zyngier@....com>
Signed-off-by: Christoffer Dall <christoffer.dall@...aro.org>
Signed-off-by: Jonghwan Choi <jhbird.choi@...sung.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>

---
 arch/arm/kvm/interrupts.S |    3 +++
 1 file changed, 3 insertions(+)

--- a/arch/arm/kvm/interrupts.S
+++ b/arch/arm/kvm/interrupts.S
@@ -292,6 +292,7 @@ THUMB(	orr	r2, r2, #PSR_T_BIT	)
 	ldr	r2, =BSYM(panic)
 	msr	ELR_hyp, r2
 	ldr	r0, =\panic_str
+	clrex				@ Clear exclusive monitor
 	eret
 .endm
 
@@ -441,6 +442,7 @@ guest_trap:
 
 4:	pop	{r0, r1}		@ Failed translation, return to guest
 	mcrr	p15, 0, r0, r1, c7	@ PAR
+	clrex
 	pop	{r0, r1, r2}
 	eret
 
@@ -467,6 +469,7 @@ switch_to_guest_vfp:
 
 	pop	{r3-r7}
 	pop	{r0-r2}
+	clrex
 	eret
 #endif
 


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