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KVM: arm/arm64: Let the timer expire in hardirq context on RT

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The timers are canceled from an preempt-notifier which is invoked with
disabled preemption which is not allowed on PREEMPT_RT.
The timer callback is short so in could be invoked in hard-IRQ context
on -RT.

Let the timer expire on hard-IRQ context even on -RT.

Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Signed-off-by: Sebastian Andrzej Siewior <bigeasy@linutronix.de>
Signed-off-by: Marc Zyngier <maz@kernel.org>
Tested-by: Julien Grall <julien.grall@arm.com>
Acked-by: Marc Zyngier <maz@kernel.org>
Link: https://lore.kernel.org/r/20191107095424.16647-1-bigeasy@linutronix.de
This commit is contained in:
Thomas Gleixner 2019-11-07 10:54:24 +01:00 • committed by Marc Zyngier
parent ca185b2609
commit 9090825fa9
1 changed files with 4 additions and 4 deletions
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8
virt/kvm/arm/arch_timer.c
View file

@ -80,7 +80,7 @@ static inline bool userspace_irqchip(struct kvm *kvm)
static void soft_timer_start(struct hrtimer *hrt, u64 ns) static void soft_timer_start(struct hrtimer *hrt, u64 ns)
{ {
hrtimer_start(hrt, ktime_add_ns(ktime_get(), ns), hrtimer_start(hrt, ktime_add_ns(ktime_get(), ns),
HRTIMER_MODE_ABS); HRTIMER_MODE_ABS_HARD);
} }
static void soft_timer_cancel(struct hrtimer *hrt) static void soft_timer_cancel(struct hrtimer *hrt)
@ -697,11 +697,11 @@ void kvm_timer_vcpu_init(struct kvm_vcpu *vcpu)
update_vtimer_cntvoff(vcpu, kvm_phys_timer_read()); update_vtimer_cntvoff(vcpu, kvm_phys_timer_read());
ptimer->cntvoff = 0; ptimer->cntvoff = 0;
hrtimer_init(&timer->bg_timer, CLOCK_MONOTONIC, HRTIMER_MODE_ABS); hrtimer_init(&timer->bg_timer, CLOCK_MONOTONIC, HRTIMER_MODE_ABS_HARD);
timer->bg_timer.function = kvm_bg_timer_expire; timer->bg_timer.function = kvm_bg_timer_expire;
hrtimer_init(&vtimer->hrtimer, CLOCK_MONOTONIC, HRTIMER_MODE_ABS); hrtimer_init(&vtimer->hrtimer, CLOCK_MONOTONIC, HRTIMER_MODE_ABS_HARD);
hrtimer_init(&ptimer->hrtimer, CLOCK_MONOTONIC, HRTIMER_MODE_ABS); hrtimer_init(&ptimer->hrtimer, CLOCK_MONOTONIC, HRTIMER_MODE_ABS_HARD);
vtimer->hrtimer.function = kvm_hrtimer_expire; vtimer->hrtimer.function = kvm_hrtimer_expire;
ptimer->hrtimer.function = kvm_hrtimer_expire; ptimer->hrtimer.function = kvm_hrtimer_expire;