From 22cfbb6d730ca2fda236b507d9fba17bf002736c Mon Sep 17 00:00:00 2001 From: Marc Zyngier Date: Fri, 21 Jun 2013 13:08:48 +0100 Subject: [PATCH] ARM: KVM: clear exclusive monitor on all exception returns Make sure we clear the exclusive monitor on all exception returns, which otherwise could lead to lock corruptions. Signed-off-by: Marc Zyngier Signed-off-by: Christoffer Dall --- arch/arm/kvm/interrupts.S | 3 +++ 1 file changed, 3 insertions(+) diff --git a/arch/arm/kvm/interrupts.S b/arch/arm/kvm/interrupts.S index 20e03d969558..16cd4ba5d7fd 100644 --- 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