From ffddd794d834f39e120603d6764d7f25bf24ddc0 Mon Sep 17 00:00:00 2001 From: Marc Zyngier Date: Sat, 26 Apr 2014 13:17:03 +0100 Subject: [PATCH 28/36] ARM: HYP/non-sec: add a barrier after setting SCR.NS==1 A CP15 instruction execution can be reordered, requiring an isb to be sure it is executed in program order. Signed-off-by: Marc Zyngier --- arch/arm/cpu/armv7/nonsec_virt.S | 1 + 1 file changed, 1 insertion(+) diff --git a/arch/arm/cpu/armv7/nonsec_virt.S b/arch/arm/cpu/armv7/nonsec_virt.S index 6367e09..12de5c2 100644 --- a/arch/arm/cpu/armv7/nonsec_virt.S +++ b/arch/arm/cpu/armv7/nonsec_virt.S @@ -46,6 +46,7 @@ _secure_monitor: #endif mcr p15, 0, r1, c1, c1, 0 @ write SCR (with NS bit set) + isb #ifdef CONFIG_ARMV7_VIRT mrceq p15, 0, r0, c12, c0, 1 @ get MVBAR value -- 1.9.0