arm/arm64: KVM: Rename irq_active to irq_queued

We have a special bitmap on the distributor struct to keep track of when
level-triggered interrupts are queued on the list registers.  This was
named irq_active, which is confusing, because the active state of an
interrupt as per the GIC spec is a different thing, not specifically
related to edge-triggered/level-triggered configurations but rather
indicates an interrupt which has been ack'ed but not yet eoi'ed.

Rename the bitmap and the corresponding accessor functions to irq_queued
to clarify what this is actually used for.

Signed-off-by: Christoffer Dall <christoffer.dall@linaro.org>

1 files changed, 19 insertions, 14 deletions

diff --git a/virt/kvm/arm/vgic.c b/virt/kvm/arm/vgic.c
index 7e86a36f3fc5..ce1a2d17ee81 100644
--- a/virt/kvm/arm/vgic.c
+++ b/virt/kvm/arm/vgic.c
@@ -60,12 +60,12 @@
  * the 'line' again. This is achieved as such:
  *
  * - When a level interrupt is moved onto a vcpu, the corresponding
- *   bit in irq_active is set. As long as this bit is set, the line
+ *   bit in irq_queued is set. As long as this bit is set, the line
  *   will be ignored for further interrupts. The interrupt is injected
  *   into the vcpu with the GICH_LR_EOI bit set (generate a
  *   maintenance interrupt on EOI).
  * - When the interrupt is EOIed, the maintenance interrupt fires,
- *   and clears the corresponding bit in irq_active. This allow the
+ *   and clears the corresponding bit in irq_queued. This allows the
  *   interrupt line to be sampled again.
  */
 
@@ -196,25 +196,25 @@ static int vgic_irq_is_enabled(struct kvm_vcpu *vcpu, int irq)
         return vgic_bitmap_get_irq_val(&dist->irq_enabled, vcpu->vcpu_id, irq);
 }
 
-static int vgic_irq_is_active(struct kvm_vcpu *vcpu, int irq)
+static int vgic_irq_is_queued(struct kvm_vcpu *vcpu, int irq)
 {
         struct vgic_dist *dist = &vcpu->kvm->arch.vgic;
 
-        return vgic_bitmap_get_irq_val(&dist->irq_active, vcpu->vcpu_id, irq);
+        return vgic_bitmap_get_irq_val(&dist->irq_queued, vcpu->vcpu_id, irq);
 }
 
-static void vgic_irq_set_active(struct kvm_vcpu *vcpu, int irq)
+static void vgic_irq_set_queued(struct kvm_vcpu *vcpu, int irq)
 {
         struct vgic_dist *dist = &vcpu->kvm->arch.vgic;
 
-        vgic_bitmap_set_irq_val(&dist->irq_active, vcpu->vcpu_id, irq, 1);
+        vgic_bitmap_set_irq_val(&dist->irq_queued, vcpu->vcpu_id, irq, 1);
 }
 
-static void vgic_irq_clear_active(struct kvm_vcpu *vcpu, int irq)
+static void vgic_irq_clear_queued(struct kvm_vcpu *vcpu, int irq)
 {
         struct vgic_dist *dist = &vcpu->kvm->arch.vgic;
 
-        vgic_bitmap_set_irq_val(&dist->irq_active, vcpu->vcpu_id, irq, 0);
+        vgic_bitmap_set_irq_val(&dist->irq_queued, vcpu->vcpu_id, irq, 0);
 }
 
 static int vgic_dist_irq_is_pending(struct kvm_vcpu *vcpu, int irq)
@@ -256,6 +256,11 @@ static void vgic_cpu_irq_clear(struct kvm_vcpu *vcpu, int irq)
                           vcpu->arch.vgic_cpu.pending_shared);
 }
 
+static bool vgic_can_sample_irq(struct kvm_vcpu *vcpu, int irq)
+{
+        return vgic_irq_is_edge(vcpu, irq) || !vgic_irq_is_queued(vcpu, irq);
+}
+
 static u32 mmio_data_read(struct kvm_exit_mmio *mmio, u32 mask)
 {
         return le32_to_cpu(*((u32 *)mmio->data)) & mask;
@@ -1079,8 +1084,8 @@ static void vgic_retire_disabled_irqs(struct kvm_vcpu *vcpu)
 
                 if (!vgic_irq_is_enabled(vcpu, vlr.irq)) {
                         vgic_retire_lr(lr, vlr.irq, vcpu);
-                        if (vgic_irq_is_active(vcpu, vlr.irq))
-                                vgic_irq_clear_active(vcpu, vlr.irq);
+                        if (vgic_irq_is_queued(vcpu, vlr.irq))
+                                vgic_irq_clear_queued(vcpu, vlr.irq);
                 }
         }
 }
@@ -1170,7 +1175,7 @@ static bool vgic_queue_sgi(struct kvm_vcpu *vcpu, int irq)
 
 static bool vgic_queue_hwirq(struct kvm_vcpu *vcpu, int irq)
 {
-        if (vgic_irq_is_active(vcpu, irq))
+        if (!vgic_can_sample_irq(vcpu, irq))
                 return true; /* level interrupt, already queued */
 
         if (vgic_queue_irq(vcpu, 0, irq)) {
@@ -1178,7 +1183,7 @@ static bool vgic_queue_hwirq(struct kvm_vcpu *vcpu, int irq)
                         vgic_dist_irq_clear_pending(vcpu, irq);
                         vgic_cpu_irq_clear(vcpu, irq);
                 } else {
-                        vgic_irq_set_active(vcpu, irq);
+                        vgic_irq_set_queued(vcpu, irq);
                 }
 
                 return true;
@@ -1262,7 +1267,7 @@ static bool vgic_process_maintenance(struct kvm_vcpu *vcpu)
                 for_each_set_bit(lr, eisr_ptr, vgic->nr_lr) {
                         struct vgic_lr vlr = vgic_get_lr(vcpu, lr);
 
-                        vgic_irq_clear_active(vcpu, vlr.irq);
+                        vgic_irq_clear_queued(vcpu, vlr.irq);
                         WARN_ON(vlr.state & LR_STATE_MASK);
                         vlr.state = 0;
                         vgic_set_lr(vcpu, lr, vlr);
@@ -1429,7 +1434,7 @@ static bool vgic_update_irq_pending(struct kvm *kvm, int cpuid,
                 goto out;
         }
 
-        if (level_triggered && vgic_irq_is_active(vcpu, irq_num)) {
+        if (!vgic_can_sample_irq(vcpu, irq_num)) {
                 /*
                  * Level interrupt in progress, will be picked up
                  * when EOId.