[PATCH v4 02/14] ARM: KVM: fix vgic V7 assembler code to work in BE image

[victor.kamensky@linaro.org (Victor Kamensky)]

The vgic h/w registers are little endian; when BE asm code
reads/writes from/to them, it needs to do byteswap after/before.
Byteswap code uses ARM_BE8 wrapper to add swap only if
CONFIG_CPU_BIG_ENDIAN is configured.

Signed-off-by: Victor Kamensky <victor.kamensky@linaro.org>
Reviewed-by: Christoffer Dall <christoffer.dall@linaro.org>
Acked-by: Marc Zyngier <marc.zyngier@arm.com>
---
 arch/arm/kvm/interrupts_head.S | 14 ++++++++++++++
 1 file changed, 14 insertions(+)

diff --git a/arch/arm/kvm/interrupts_head.S b/arch/arm/kvm/interrupts_head.S
index 76af9302..e627858 100644
--- a/arch/arm/kvm/interrupts_head.S
+++ b/arch/arm/kvm/interrupts_head.S
@@ -1,4 +1,5 @@
 #include <linux/irqchip/arm-gic.h>
+#include <asm/assembler.h>
 
 #define VCPU_USR_REG(_reg_nr)	(VCPU_USR_REGS + (_reg_nr * 4))
 #define VCPU_USR_SP		(VCPU_USR_REG(13))
@@ -420,6 +421,14 @@ vcpu	.req	r0		@ vcpu pointer always in r0
 	ldr	r8, [r2, #GICH_ELRSR0]
 	ldr	r9, [r2, #GICH_ELRSR1]
 	ldr	r10, [r2, #GICH_APR]
+ARM_BE8(rev	r3, r3	)
+ARM_BE8(rev	r4, r4	)
+ARM_BE8(rev	r5, r5	)
+ARM_BE8(rev	r6, r6	)
+ARM_BE8(rev	r7, r7	)
+ARM_BE8(rev	r8, r8	)
+ARM_BE8(rev	r9, r9	)
+ARM_BE8(rev	r10, r10	)
 
 	str	r3, [r11, #VGIC_CPU_HCR]
 	str	r4, [r11, #VGIC_CPU_VMCR]
@@ -439,6 +448,7 @@ vcpu	.req	r0		@ vcpu pointer always in r0
 	add	r3, r11, #VGIC_CPU_LR
 	ldr	r4, [r11, #VGIC_CPU_NR_LR]
 1:	ldr	r6, [r2], #4
+ARM_BE8(rev	r6, r6	)
 	str	r6, [r3], #4
 	subs	r4, r4, #1
 	bne	1b
@@ -466,6 +476,9 @@ vcpu	.req	r0		@ vcpu pointer always in r0
 	ldr	r3, [r11, #VGIC_CPU_HCR]
 	ldr	r4, [r11, #VGIC_CPU_VMCR]
 	ldr	r8, [r11, #VGIC_CPU_APR]
+ARM_BE8(rev	r3, r3	)
+ARM_BE8(rev	r4, r4	)
+ARM_BE8(rev	r8, r8	)
 
 	str	r3, [r2, #GICH_HCR]
 	str	r4, [r2, #GICH_VMCR]
@@ -476,6 +489,7 @@ vcpu	.req	r0		@ vcpu pointer always in r0
 	add	r3, r11, #VGIC_CPU_LR
 	ldr	r4, [r11, #VGIC_CPU_NR_LR]
 1:	ldr	r6, [r3], #4
+ARM_BE8(rev	r6, r6  )
 	str	r6, [r2], #4
 	subs	r4, r4, #1
 	bne	1b
-- 
1.8.1.4