From 1f3d8699be82583c713e2a1099c597a740ebaf4d Mon Sep 17 00:00:00 2001
From: Mark Rutland <mark.rutland@arm.com>
Date: Thu, 8 Sep 2016 13:55:37 +0100
Subject: arm64/kvm: use {read,write}_sysreg()

A while back we added {read,write}_sysreg accessors to handle accesses
to system registers, without the usual boilerplate asm volatile,
temporary variable, etc.

This patch makes use of these in the arm64 KVM code to make the code
shorter and clearer.

At the same time, a comment style violation next to a system register
access is fixed up in reset_pmcr, and comments describing whether
operations are reads or writes are removed as this is now painfully
obvious.

Cc: Catalin Marinas <catalin.marinas@arm.com>
Cc: Marc Zyngier <marc.zyngier@arm.com>
Cc: Will Deacon <will.deacon@arm.com>
Acked-by: Christoffer Dall <christoffer.dall@linaro.org>
Signed-off-by: Mark Rutland <mark.rutland@arm.com>
Signed-off-by: Will Deacon <will.deacon@arm.com>
---
 arch/arm64/kvm/sys_regs_generic_v8.c | 6 ++----
 1 file changed, 2 insertions(+), 4 deletions(-)

(limited to 'arch/arm64/kvm/sys_regs_generic_v8.c')

diff --git a/arch/arm64/kvm/sys_regs_generic_v8.c b/arch/arm64/kvm/sys_regs_generic_v8.c
index ed90578fa120..46af7186bca6 100644
--- a/arch/arm64/kvm/sys_regs_generic_v8.c
+++ b/arch/arm64/kvm/sys_regs_generic_v8.c
@@ -26,6 +26,7 @@
 #include <asm/kvm_host.h>
 #include <asm/kvm_emulate.h>
 #include <asm/kvm_coproc.h>
+#include <asm/sysreg.h>
 #include <linux/init.h>
 
 #include "sys_regs.h"
@@ -43,10 +44,7 @@ static bool access_actlr(struct kvm_vcpu *vcpu,
 
 static void reset_actlr(struct kvm_vcpu *vcpu, const struct sys_reg_desc *r)
 {
-	u64 actlr;
-
-	asm volatile("mrs %0, actlr_el1\n" : "=r" (actlr));
-	vcpu_sys_reg(vcpu, ACTLR_EL1) = actlr;
+	vcpu_sys_reg(vcpu, ACTLR_EL1) = read_sysreg(actlr_el1);
 }
 
 /*
-- 
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