linux-kernel - [PATCH 3/3] KVM: arm/arm64: timer: Switch to CLOCK_MONOTONIC

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Message-Id: <1452879670-16133-4-git-send-email-marc.zyngier@arm.com>
Date:	Fri, 15 Jan 2016 17:41:10 +0000
From:	Marc Zyngier <marc.zyngier@....com>
To:	Thomas Gleixner <tglx@...utronix.de>
Cc:	<linux-kernel@...r.kernel.org>, Tomasz Nowicki <tn@...ihalf.com>,
	Christoffer Dall <christoffer.dall@...aro.org>
Subject: [PATCH 3/3] KVM: arm/arm64: timer: Switch to CLOCK_MONOTONIC_RAW

In order to avoid NTP messing with the guest timer behind our back,
use the new and improved monotonic raw version of the hrtimers.

Signed-off-by: Marc Zyngier <marc.zyngier@....com>
---
 virt/kvm/arm/arch_timer.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/virt/kvm/arm/arch_timer.c b/virt/kvm/arm/arch_timer.c
index 69bca18..97c5815 100644
--- a/virt/kvm/arm/arch_timer.c
+++ b/virt/kvm/arm/arch_timer.c
@@ -48,7 +48,7 @@ static bool timer_is_armed(struct arch_timer_cpu *timer)
 static void timer_arm(struct arch_timer_cpu *timer, u64 ns)
 {
 	timer->armed = true;
-	hrtimer_start(&timer->timer, ktime_add_ns(ktime_get(), ns),
+	hrtimer_start(&timer->timer, ktime_add_ns(ktime_get_raw(), ns),
 		      HRTIMER_MODE_ABS);
 }
 
@@ -308,7 +308,7 @@ void kvm_timer_vcpu_init(struct kvm_vcpu *vcpu)
 	struct arch_timer_cpu *timer = &vcpu->arch.timer_cpu;
 
 	INIT_WORK(&timer->expired, kvm_timer_inject_irq_work);
-	hrtimer_init(&timer->timer, CLOCK_MONOTONIC, HRTIMER_MODE_ABS);
+	hrtimer_init(&timer->timer, CLOCK_MONOTONIC_RAW, HRTIMER_MODE_ABS);
 	timer->timer.function = kvm_timer_expire;
 }
 
-- 
2.1.4