linux-kernel - [tip:timers/core] KVM: arm/arm64: timer: Switch to CLOCK_MONOTONIC

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Message-ID: <tip-a6e707ddbdf150bd1c2a5c0eccc55abdc62a0039@git.kernel.org>
Date:	Wed, 27 Jan 2016 03:43:41 -0800
From:	tip-bot for Marc Zyngier <tipbot@...or.com>
To:	linux-tip-commits@...r.kernel.org
Cc:	christoffer.dall@...aro.org, marc.zyngier@....com,
	linux-kernel@...r.kernel.org, tn@...ihalf.com, hpa@...or.com,
	mingo@...nel.org, tglx@...utronix.de
Subject: [tip:timers/core] KVM: arm/arm64: timer:
  Switch to CLOCK_MONOTONIC_RAW

Commit-ID:  a6e707ddbdf150bd1c2a5c0eccc55abdc62a0039
Gitweb:     http://git.kernel.org/tip/a6e707ddbdf150bd1c2a5c0eccc55abdc62a0039
Author:     Marc Zyngier <marc.zyngier@....com>
AuthorDate: Fri, 15 Jan 2016 17:41:10 +0000
Committer:  Thomas Gleixner <tglx@...utronix.de>
CommitDate: Wed, 27 Jan 2016 12:38:04 +0100

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>
Cc: Tomasz Nowicki <tn@...ihalf.com>
Cc: Christoffer Dall <christoffer.dall@...aro.org>
Link: http://lkml.kernel.org/r/1452879670-16133-4-git-send-email-marc.zyngier@arm.com
Signed-off-by: Thomas Gleixner <tglx@...utronix.de>
---
 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;
 }