[PATCH v4 3/8] arm/arm64: KVM: vgic: Parametrize VGIC_NR_SHARED_IRQS

Marc Zyngier
2014-09-11T11:09:26Z

Having a dynamic number of supported interrupts means that we
cannot relly on VGIC_NR_SHARED_IRQS being fixed anymore.

Instead, make it take the distributor structure as a parameter,
so it can return the right value.

Reviewed-by: Christoffer Dall <christoffer.dall@linaro.org>
Signed-off-by: Marc Zyngier <marc.zyngier@arm.com>
---
include/kvm/arm_vgic.h | 1 -
virt/kvm/arm/vgic.c | 16 +++++++++++-----
2 files changed, 11 insertions(+), 6 deletions(-)

diff --git a/include/kvm/arm_vgic.h b/include/kvm/arm_vgic.h
index bdaac57..bdeb451 100644
--- a/include/kvm/arm_vgic.h
+++ b/include/kvm/arm_vgic.h
@@ -29,7 +29,6 @@
#define VGIC_NR_SGIS 16
#define VGIC_NR_PPIS 16
#define VGIC_NR_PRIVATE_IRQS (VGIC_NR_SGIS + VGIC_NR_PPIS)
-#define VGIC_NR_SHARED_IRQS (VGIC_NR_IRQS - VGIC_NR_PRIVATE_IRQS)
#define VGIC_MAX_CPUS KVM_MAX_VCPUS

#define VGIC_V2_MAX_LRS (1 << 6)
diff --git a/virt/kvm/arm/vgic.c b/virt/kvm/arm/vgic.c
index 92c086e..93fe73b 100644
--- a/virt/kvm/arm/vgic.c
+++ b/virt/kvm/arm/vgic.c
@@ -1083,11 +1083,17 @@ static void vgic_dispatch_sgi(struct kvm_vcpu *vcpu, u32 reg)
}
}

+static int vgic_nr_shared_irqs(struct vgic_dist *dist)
+{
+ return dist->nr_irqs - VGIC_NR_PRIVATE_IRQS;
+}
+
static int compute_pending_for_cpu(struct kvm_vcpu *vcpu)
{
struct vgic_dist *dist = &vcpu->kvm->arch.vgic;
unsigned long *pending, *enabled, *pend_percpu, *pend_shared;
unsigned long pending_private, pending_shared;
+ int nr_shared = vgic_nr_shared_irqs(dist);
int vcpu_id;

vcpu_id = vcpu->vcpu_id;
@@ -1100,15 +1106,15 @@ static int compute_pending_for_cpu(struct kvm_vcpu *vcpu)

pending = vgic_bitmap_get_shared_map(&dist->irq_pending);
enabled = vgic_bitmap_get_shared_map(&dist->irq_enabled);
- bitmap_and(pend_shared, pending, enabled, VGIC_NR_SHARED_IRQS);
+ bitmap_and(pend_shared, pending, enabled, nr_shared);
bitmap_and(pend_shared, pend_shared,
vgic_bitmap_get_shared_map(&dist->irq_spi_target[vcpu_id]),
- VGIC_NR_SHARED_IRQS);
+ nr_shared);

pending_private = find_first_bit(pend_percpu, VGIC_NR_PRIVATE_IRQS);
- pending_shared = find_first_bit(pend_shared, VGIC_NR_SHARED_IRQS);
+ pending_shared = find_first_bit(pend_shared, nr_shared);
return (pending_private < VGIC_NR_PRIVATE_IRQS ||
- pending_shared < VGIC_NR_SHARED_IRQS);
+ pending_shared < vgic_nr_shared_irqs(dist));
}

/*
@@ -1365,7 +1371,7 @@ static void __kvm_vgic_flush_hwstate(struct kvm_vcpu *vcpu)
}

/* SPIs */
- for_each_set_bit(i, vgic_cpu->pending_shared, VGIC_NR_SHARED_IRQS) {
+ for_each_set_bit(i, vgic_cpu->pending_shared, vgic_nr_shared_irqs(dist)) {
if (!vgic_queue_hwirq(vcpu, i + VGIC_NR_PRIVATE_IRQS))
overflow = 1;
}
--
2.0.4