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Message-ID: <20150520105715.042f11a6@gandalf.local.home>
Date: Wed, 20 May 2015 10:57:15 -0400
From: Steven Rostedt <rostedt@...dmis.org>
To: LKML <linux-kernel@...r.kernel.org>,
linux-rt-users <linux-rt-users@...r.kernel.org>
Cc: Thomas Gleixner <tglx@...utronix.de>,
Carsten Emde <C.Emde@...dl.org>,
John Kacur <jkacur@...hat.com>,
Sebastian Andrzej Siewior <bigeasy@...utronix.de>
Subject: [ANNOUNCE] 3.4.107-rt134
Dear RT Folks,
I'm pleased to announce the 3.4.107-rt134 stable release.
You can get this release via the git tree at:
git://git.kernel.org/pub/scm/linux/kernel/git/rt/linux-stable-rt.git
branch: v3.4-rt
Head SHA1: 078c1c9a5d7b822c2dbf8944dca0f59c96e89088
Or to build 3.4.107-rt134 directly, the following patches should be applied:
http://www.kernel.org/pub/linux/kernel/v3.x/linux-3.4.tar.xz
http://www.kernel.org/pub/linux/kernel/v3.x/patch-3.4.107.xz
http://www.kernel.org/pub/linux/kernel/projects/rt/3.4/patch-3.4.107-rt134.patch.xz
You can also build from 3.4.107-rt133 by applying the incremental patch:
http://www.kernel.org/pub/linux/kernel/projects/rt/3.4/incr/patch-3.4.107-rt133-rt134.patch.xz
Enjoy,
-- Steve
Changes from v3.4.107-rt133:
---
Marcelo Tosatti (1):
KVM: lapic: mark LAPIC timer handler as irqsafe
Steven Rostedt (Red Hat) (1):
Linux 3.4.107-rt134
----
arch/x86/kvm/lapic.c | 42 +++++++++++++++++++++++++++++++++++++++---
localversion-rt | 2 +-
2 files changed, 40 insertions(+), 4 deletions(-)
---------------------------
diff --git a/arch/x86/kvm/lapic.c b/arch/x86/kvm/lapic.c
index 578613da251e..b4bdc60f171f 100644
--- a/arch/x86/kvm/lapic.c
+++ b/arch/x86/kvm/lapic.c
@@ -683,8 +683,38 @@ static void update_divide_count(struct kvm_lapic *apic)
apic->divide_count);
}
+
+static enum hrtimer_restart apic_timer_fn(struct hrtimer *data);
+
+static void apic_timer_expired(struct hrtimer *data)
+{
+ int ret, i = 0;
+ enum hrtimer_restart r;
+ struct kvm_timer *ktimer = container_of(data, struct kvm_timer, timer);
+
+ r = apic_timer_fn(data);
+
+ if (r == HRTIMER_RESTART) {
+ do {
+ ret = hrtimer_start_expires(data, HRTIMER_MODE_ABS);
+ if (ret == -ETIME)
+ hrtimer_add_expires_ns(&ktimer->timer,
+ ktimer->period);
+ i++;
+ } while (ret == -ETIME && i < 10);
+
+ if (ret == -ETIME) {
+ printk_once(KERN_ERR "%s: failed to reprogram timer\n",
+ __func__);
+ WARN_ON_ONCE(1);
+ }
+ }
+}
+
+
static void start_apic_timer(struct kvm_lapic *apic)
{
+ int ret;
ktime_t now;
atomic_set(&apic->lapic_timer.pending, 0);
@@ -714,9 +744,11 @@ static void start_apic_timer(struct kvm_lapic *apic)
}
}
- hrtimer_start(&apic->lapic_timer.timer,
+ ret = hrtimer_start(&apic->lapic_timer.timer,
ktime_add_ns(now, apic->lapic_timer.period),
HRTIMER_MODE_ABS);
+ if (ret == -ETIME)
+ apic_timer_expired(&apic->lapic_timer.timer);
apic_debug("%s: bus cycle is %" PRId64 "ns, now 0x%016"
PRIx64 ", "
@@ -746,8 +778,10 @@ static void start_apic_timer(struct kvm_lapic *apic)
ns = (tscdeadline - guest_tsc) * 1000000ULL;
do_div(ns, this_tsc_khz);
}
- hrtimer_start(&apic->lapic_timer.timer,
+ ret = hrtimer_start(&apic->lapic_timer.timer,
ktime_add_ns(now, ns), HRTIMER_MODE_ABS);
+ if (ret == -ETIME)
+ apic_timer_expired(&apic->lapic_timer.timer);
local_irq_restore(flags);
}
@@ -1177,6 +1211,7 @@ int kvm_create_lapic(struct kvm_vcpu *vcpu)
hrtimer_init(&apic->lapic_timer.timer, CLOCK_MONOTONIC,
HRTIMER_MODE_ABS);
apic->lapic_timer.timer.function = kvm_timer_fn;
+ apic->lapic_timer.timer.irqsafe = 1;
apic->lapic_timer.t_ops = &lapic_timer_ops;
apic->lapic_timer.kvm = vcpu->kvm;
apic->lapic_timer.vcpu = vcpu;
@@ -1273,7 +1308,8 @@ void __kvm_migrate_apic_timer(struct kvm_vcpu *vcpu)
timer = &apic->lapic_timer.timer;
if (hrtimer_cancel(timer))
- hrtimer_start_expires(timer, HRTIMER_MODE_ABS);
+ if (hrtimer_start_expires(timer, HRTIMER_MODE_ABS) == -ETIME)
+ apic_timer_expired(timer);
}
void kvm_lapic_sync_from_vapic(struct kvm_vcpu *vcpu)
diff --git a/localversion-rt b/localversion-rt
index c2c7e0fb6685..6067da4c8c99 100644
--- a/localversion-rt
+++ b/localversion-rt
@@ -1 +1 @@
--rt133
+-rt134
--
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