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KVM: arm/arm64: timer: Allow the timer to control the active state

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In order to remove the crude hack where we sneak the masked bit
into the timer's control register, make use of the phys_irq_map
API control the active state of the interrupt.

This causes some limited changes to allow for potential error
propagation.

Reviewed-by: Christoffer Dall <christoffer.dall@linaro.org>
Signed-off-by: Marc Zyngier <marc.zyngier@arm.com>
This commit is contained in:
Marc Zyngier 2014-06-23 13:59:13 +01:00
parent 773299a570
commit f120cd6533
4 changed files with 29 additions and 15 deletions
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4
arch/arm/kvm/reset.c
View File

@ -77,7 +77,5 @@ int kvm_reset_vcpu(struct kvm_vcpu *vcpu)
kvm_reset_coprocs(vcpu);
/* Reset arch_timer context */
kvm_timer_vcpu_reset(vcpu, cpu_vtimer_irq);
return 0;
return kvm_timer_vcpu_reset(vcpu, cpu_vtimer_irq);
}

4
arch/arm64/kvm/reset.c
View File

@ -121,7 +121,5 @@ int kvm_reset_vcpu(struct kvm_vcpu *vcpu)
kvm_reset_sys_regs(vcpu);
/* Reset timer */
kvm_timer_vcpu_reset(vcpu, cpu_vtimer_irq);
return 0;
return kvm_timer_vcpu_reset(vcpu, cpu_vtimer_irq);
}

7
include/kvm/arm_arch_timer.h
View File

@ -52,13 +52,16 @@ struct arch_timer_cpu {
/* Timer IRQ */
const struct kvm_irq_level *irq;
/* VGIC mapping */
struct irq_phys_map *map;
};
int kvm_timer_hyp_init(void);
void kvm_timer_enable(struct kvm *kvm);
void kvm_timer_init(struct kvm *kvm);
void kvm_timer_vcpu_reset(struct kvm_vcpu *vcpu,
const struct kvm_irq_level *irq);
int kvm_timer_vcpu_reset(struct kvm_vcpu *vcpu,
const struct kvm_irq_level *irq);
void kvm_timer_vcpu_init(struct kvm_vcpu *vcpu);
void kvm_timer_flush_hwstate(struct kvm_vcpu *vcpu);
void kvm_timer_sync_hwstate(struct kvm_vcpu *vcpu);

29
virt/kvm/arm/arch_timer.c
View File

@ -64,10 +64,10 @@ static void kvm_timer_inject_irq(struct kvm_vcpu *vcpu)
int ret;
struct arch_timer_cpu *timer = &vcpu->arch.timer_cpu;
timer->cntv_ctl |= ARCH_TIMER_CTRL_IT_MASK;
ret = kvm_vgic_inject_irq(vcpu->kvm, vcpu->vcpu_id,
timer->irq->irq,
timer->irq->level);
kvm_vgic_set_phys_irq_active(timer->map, true);
ret = kvm_vgic_inject_mapped_irq(vcpu->kvm, vcpu->vcpu_id,
timer->map,
timer->irq->level);
WARN_ON(ret);
}
@ -117,7 +117,8 @@ bool kvm_timer_should_fire(struct kvm_vcpu *vcpu)
cycle_t cval, now;
if ((timer->cntv_ctl & ARCH_TIMER_CTRL_IT_MASK) ||
!(timer->cntv_ctl & ARCH_TIMER_CTRL_ENABLE))
!(timer->cntv_ctl & ARCH_TIMER_CTRL_ENABLE) ||
kvm_vgic_get_phys_irq_active(timer->map))
return false;
cval = timer->cntv_cval;
@ -184,10 +185,11 @@ void kvm_timer_sync_hwstate(struct kvm_vcpu *vcpu)
timer_arm(timer, ns);
}
void kvm_timer_vcpu_reset(struct kvm_vcpu *vcpu,
const struct kvm_irq_level *irq)
int kvm_timer_vcpu_reset(struct kvm_vcpu *vcpu,
const struct kvm_irq_level *irq)
{
struct arch_timer_cpu *timer = &vcpu->arch.timer_cpu;
struct irq_phys_map *map;
/*
* The vcpu timer irq number cannot be determined in
@ -196,6 +198,17 @@ void kvm_timer_vcpu_reset(struct kvm_vcpu *vcpu,
* vcpu timer irq number when the vcpu is reset.
*/
timer->irq = irq;
/*
* Tell the VGIC that the virtual interrupt is tied to a
* physical interrupt. We do that once per VCPU.
*/
map = kvm_vgic_map_phys_irq(vcpu, irq->irq, host_vtimer_irq);
if (WARN_ON(IS_ERR(map)))
return PTR_ERR(map);
timer->map = map;
return 0;
}
void kvm_timer_vcpu_init(struct kvm_vcpu *vcpu)
@ -335,6 +348,8 @@ void kvm_timer_vcpu_terminate(struct kvm_vcpu *vcpu)
struct arch_timer_cpu *timer = &vcpu->arch.timer_cpu;
timer_disarm(timer);
if (timer->map)
kvm_vgic_unmap_phys_irq(vcpu, timer->map);
}
void kvm_timer_enable(struct kvm *kvm)