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@xxxxxxxxxx>
---
include/kvm/arm_vgic.h | 4 ++--
virt/kvm/arm/vgic.c | 33 +++++++++++++++++++--------------
2 files changed, 21 insertions(+), 16 deletions(-)
diff --git a/include/kvm/arm_vgic.h b/include/kvm/arm_vgic.h
index 388d442..7d8e61f 100644
--- a/include/kvm/arm_vgic.h
+++ b/include/kvm/arm_vgic.h
@@ -143,8 +143,8 @@ struct vgic_dist {
/* Interrupt state is pending on the distributor */
struct vgic_bitmap irq_pending;
- /* Level-triggered interrupt in progress */
- struct vgic_bitmap irq_active;
+ /* Level-triggered interrupt queued on VCPU interface */
+ struct vgic_bitmap irq_queued;
/* Interrupt priority. Not used yet. */
struct vgic_bytemap irq_priority;
diff --git a/virt/kvm/arm/vgic.c b/virt/kvm/arm/vgic.c
index 7e86a36..ce1a2d1 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.
--
2.0.0
--
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