arm/arm64: KVM: vgic: Parametrize VGIC_NR_SHARED_IRQS

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>

diff --git a/include/kvm/arm_vgic.h b/include/kvm/arm_vgic.h
index fd1b8f2..b2f9936 100644 (file)
--- 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 08db876..7d64dc2 100644 (file)
--- a/virt/kvm/arm/vgic.c
+++ b/virt/kvm/arm/vgic.c
@@ -1086,11 +1086,17 @@ 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;
@@ -1103,15 +1109,15 @@ 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));
 }
 
 /*
@@ -1368,7 +1374,7 @@ 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;
        }