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-rw-r--r--virt/kvm/arm/arch_timer.c122
1 files changed, 99 insertions, 23 deletions
diff --git a/virt/kvm/arm/arch_timer.c b/virt/kvm/arm/arch_timer.c
index 363f0d2cfc79..5dc216748d54 100644
--- a/virt/kvm/arm/arch_timer.c
+++ b/virt/kvm/arm/arch_timer.c
@@ -184,6 +184,27 @@ bool kvm_timer_should_fire(struct arch_timer_context *timer_ctx)
return cval <= now;
}
+/*
+ * Reflect the timer output level into the kvm_run structure
+ */
+void kvm_timer_update_run(struct kvm_vcpu *vcpu)
+{
+ struct arch_timer_context *vtimer = vcpu_vtimer(vcpu);
+ struct arch_timer_context *ptimer = vcpu_ptimer(vcpu);
+ struct kvm_sync_regs *regs = &vcpu->run->s.regs;
+
+ if (likely(irqchip_in_kernel(vcpu->kvm)))
+ return;
+
+ /* Populate the device bitmap with the timer states */
+ regs->device_irq_level &= ~(KVM_ARM_DEV_EL1_VTIMER |
+ KVM_ARM_DEV_EL1_PTIMER);
+ if (vtimer->irq.level)
+ regs->device_irq_level |= KVM_ARM_DEV_EL1_VTIMER;
+ if (ptimer->irq.level)
+ regs->device_irq_level |= KVM_ARM_DEV_EL1_PTIMER;
+}
+
static void kvm_timer_update_irq(struct kvm_vcpu *vcpu, bool new_level,
struct arch_timer_context *timer_ctx)
{
@@ -194,9 +215,12 @@ static void kvm_timer_update_irq(struct kvm_vcpu *vcpu, bool new_level,
trace_kvm_timer_update_irq(vcpu->vcpu_id, timer_ctx->irq.irq,
timer_ctx->irq.level);
- ret = kvm_vgic_inject_irq(vcpu->kvm, vcpu->vcpu_id, timer_ctx->irq.irq,
- timer_ctx->irq.level);
- WARN_ON(ret);
+ if (likely(irqchip_in_kernel(vcpu->kvm))) {
+ ret = kvm_vgic_inject_irq(vcpu->kvm, vcpu->vcpu_id,
+ timer_ctx->irq.irq,
+ timer_ctx->irq.level);
+ WARN_ON(ret);
+ }
}
/*
@@ -215,7 +239,7 @@ static void kvm_timer_update_state(struct kvm_vcpu *vcpu)
* because the guest would never see the interrupt. Instead wait
* until we call this function from kvm_timer_flush_hwstate.
*/
- if (!timer->enabled)
+ if (unlikely(!timer->enabled))
return;
if (kvm_timer_should_fire(vtimer) != vtimer->irq.level)
@@ -282,28 +306,12 @@ void kvm_timer_unschedule(struct kvm_vcpu *vcpu)
timer_disarm(timer);
}
-/**
- * kvm_timer_flush_hwstate - prepare to move the virt timer to the cpu
- * @vcpu: The vcpu pointer
- *
- * Check if the virtual timer has expired while we were running in the host,
- * and inject an interrupt if that was the case.
- */
-void kvm_timer_flush_hwstate(struct kvm_vcpu *vcpu)
+static void kvm_timer_flush_hwstate_vgic(struct kvm_vcpu *vcpu)
{
- struct arch_timer_cpu *timer = &vcpu->arch.timer_cpu;
struct arch_timer_context *vtimer = vcpu_vtimer(vcpu);
bool phys_active;
int ret;
- if (unlikely(!timer->enabled))
- return;
-
- kvm_timer_update_state(vcpu);
-
- /* Set the background timer for the physical timer emulation. */
- kvm_timer_emulate(vcpu, vcpu_ptimer(vcpu));
-
/*
* If we enter the guest with the virtual input level to the VGIC
* asserted, then we have already told the VGIC what we need to, and
@@ -355,11 +363,72 @@ void kvm_timer_flush_hwstate(struct kvm_vcpu *vcpu)
vtimer->active_cleared_last = !phys_active;
}
+bool kvm_timer_should_notify_user(struct kvm_vcpu *vcpu)
+{
+ struct arch_timer_context *vtimer = vcpu_vtimer(vcpu);
+ struct arch_timer_context *ptimer = vcpu_ptimer(vcpu);
+ struct kvm_sync_regs *sregs = &vcpu->run->s.regs;
+ bool vlevel, plevel;
+
+ if (likely(irqchip_in_kernel(vcpu->kvm)))
+ return false;
+
+ vlevel = sregs->device_irq_level & KVM_ARM_DEV_EL1_VTIMER;
+ plevel = sregs->device_irq_level & KVM_ARM_DEV_EL1_PTIMER;
+
+ return vtimer->irq.level != vlevel ||
+ ptimer->irq.level != plevel;
+}
+
+static void kvm_timer_flush_hwstate_user(struct kvm_vcpu *vcpu)
+{
+ struct arch_timer_context *vtimer = vcpu_vtimer(vcpu);
+
+ /*
+ * To prevent continuously exiting from the guest, we mask the
+ * physical interrupt such that the guest can make forward progress.
+ * Once we detect the output level being deasserted, we unmask the
+ * interrupt again so that we exit from the guest when the timer
+ * fires.
+ */
+ if (vtimer->irq.level)
+ disable_percpu_irq(host_vtimer_irq);
+ else
+ enable_percpu_irq(host_vtimer_irq, 0);
+}
+
+/**
+ * kvm_timer_flush_hwstate - prepare timers before running the vcpu
+ * @vcpu: The vcpu pointer
+ *
+ * Check if the virtual timer has expired while we were running in the host,
+ * and inject an interrupt if that was the case, making sure the timer is
+ * masked or disabled on the host so that we keep executing. Also schedule a
+ * software timer for the physical timer if it is enabled.
+ */
+void kvm_timer_flush_hwstate(struct kvm_vcpu *vcpu)
+{
+ struct arch_timer_cpu *timer = &vcpu->arch.timer_cpu;
+
+ if (unlikely(!timer->enabled))
+ return;
+
+ kvm_timer_update_state(vcpu);
+
+ /* Set the background timer for the physical timer emulation. */
+ kvm_timer_emulate(vcpu, vcpu_ptimer(vcpu));
+
+ if (unlikely(!irqchip_in_kernel(vcpu->kvm)))
+ kvm_timer_flush_hwstate_user(vcpu);
+ else
+ kvm_timer_flush_hwstate_vgic(vcpu);
+}
+
/**
* kvm_timer_sync_hwstate - sync timer state from cpu
* @vcpu: The vcpu pointer
*
- * Check if the virtual timer has expired while we were running in the guest,
+ * Check if any of the timers have expired while we were running in the guest,
* and inject an interrupt if that was the case.
*/
void kvm_timer_sync_hwstate(struct kvm_vcpu *vcpu)
@@ -559,6 +628,13 @@ int kvm_timer_enable(struct kvm_vcpu *vcpu)
if (timer->enabled)
return 0;
+ /* Without a VGIC we do not map virtual IRQs to physical IRQs */
+ if (!irqchip_in_kernel(vcpu->kvm))
+ goto no_vgic;
+
+ if (!vgic_initialized(vcpu->kvm))
+ return -ENODEV;
+
/*
* Find the physical IRQ number corresponding to the host_vtimer_irq
*/
@@ -582,8 +658,8 @@ int kvm_timer_enable(struct kvm_vcpu *vcpu)
if (ret)
return ret;
+no_vgic:
timer->enabled = 1;
-
return 0;
}