[PATCH v4 6/8] arm/arm64: KVM: vgic: kill VGIC_NR_IRQS

Marc Zyngier
2014-09-11T11:09:32Z

Nuke VGIC_NR_IRQS entierly, now that the distributor instance
contains the number of IRQ allocated to this GIC.

Also add VGIC_NR_IRQS_LEGACY to preserve the current API.

Signed-off-by: Marc Zyngier <marc.zyngier@arm.com>
---
include/kvm/arm_vgic.h | 6 +++---
virt/kvm/arm/vgic.c | 17 +++++++++++------
2 files changed, 14 insertions(+), 9 deletions(-)

diff --git a/include/kvm/arm_vgic.h b/include/kvm/arm_vgic.h
index 97f5f57..0a27564 100644
--- a/include/kvm/arm_vgic.h
+++ b/include/kvm/arm_vgic.h
@@ -25,7 +25,7 @@
#include <linux/spinlock.h>
#include <linux/types.h>

-#define VGIC_NR_IRQS 256
+#define VGIC_NR_IRQS_LEGACY 256
#define VGIC_NR_SGIS 16
#define VGIC_NR_PPIS 16
#define VGIC_NR_PRIVATE_IRQS (VGIC_NR_SGIS + VGIC_NR_PPIS)
@@ -39,11 +39,11 @@
#error Invalid number of CPU interfaces
#endif

-#if (VGIC_NR_IRQS & 31)
+#if (VGIC_NR_IRQS_LEGACY & 31)
#error "VGIC_NR_IRQS must be a multiple of 32"
#endif

-#if (VGIC_NR_IRQS > VGIC_MAX_IRQS)
+#if (VGIC_NR_IRQS_LEGACY > VGIC_MAX_IRQS)
#error "VGIC_NR_IRQS must be <= 1024"
#endif

diff --git a/virt/kvm/arm/vgic.c b/virt/kvm/arm/vgic.c
index ab01cab..dfa6430 100644
--- a/virt/kvm/arm/vgic.c
+++ b/virt/kvm/arm/vgic.c
@@ -436,7 +436,7 @@ static bool handle_mmio_misc(struct kvm_vcpu *vcpu,

case 4: /* GICD_TYPER */
reg = (atomic_read(&vcpu->kvm->online_vcpus) - 1) << 5;
- reg |= (VGIC_NR_IRQS >> 5) - 1;
+ reg |= (vcpu->kvm->arch.vgic.nr_irqs >> 5) - 1;
vgic_reg_access(mmio, &reg, word_offset,
ACCESS_READ_VALUE | ACCESS_WRITE_IGNORED);
break;
@@ -1274,13 +1274,14 @@ static void vgic_retire_disabled_irqs(struct kvm_vcpu *vcpu)
static bool vgic_queue_irq(struct kvm_vcpu *vcpu, u8 sgi_source_id, int irq)
{
struct vgic_cpu *vgic_cpu = &vcpu->arch.vgic_cpu;
+ struct vgic_dist *dist = &vcpu->kvm->arch.vgic;
struct vgic_lr vlr;
int lr;

/* Sanitize the input... */
BUG_ON(sgi_source_id & ~7);
BUG_ON(sgi_source_id && irq >= VGIC_NR_SGIS);
- BUG_ON(irq >= VGIC_NR_IRQS);
+ BUG_ON(irq >= dist->nr_irqs);

kvm_debug("Queue IRQ%d\n", irq);

@@ -1516,7 +1517,7 @@ static void __kvm_vgic_sync_hwstate(struct kvm_vcpu *vcpu)

vlr = vgic_get_lr(vcpu, lr);

- BUG_ON(vlr.irq >= VGIC_NR_IRQS);
+ BUG_ON(vlr.irq >= dist->nr_irqs);
vgic_cpu->vgic_irq_lr_map[vlr.irq] = LR_EMPTY;
}

@@ -1738,7 +1739,7 @@ int kvm_vgic_vcpu_init(struct kvm_vcpu *vcpu)
if (vcpu->vcpu_id >= dist->nr_cpus)
return -EBUSY;

- for (i = 0; i < VGIC_NR_IRQS; i++) {
+ for (i = 0; i < dist->nr_irqs; i++) {
if (i < VGIC_NR_PPIS)
vgic_bitmap_set_irq_val(&dist->irq_enabled,
vcpu->vcpu_id, i, 1);
@@ -1880,7 +1881,11 @@ static int vgic_init_maps(struct kvm *kvm)
int ret, i;

nr_cpus = dist->nr_cpus = KVM_MAX_VCPUS;
- nr_irqs = dist->nr_irqs = VGIC_NR_IRQS;
+
+ if (!dist->nr_irqs)
+ dist->nr_irqs = VGIC_NR_IRQS_LEGACY;
+
+ nr_irqs = dist->nr_irqs;

ret = vgic_init_bitmap(&dist->irq_enabled, nr_cpus, nr_irqs);
ret |= vgic_init_bitmap(&dist->irq_level, nr_cpus, nr_irqs);
@@ -1964,7 +1969,7 @@ int kvm_vgic_init(struct kvm *kvm)
goto out;
}

- for (i = VGIC_NR_PRIVATE_IRQS; i < VGIC_NR_IRQS; i += 4)
+ for (i = VGIC_NR_PRIVATE_IRQS; i < kvm->arch.vgic.nr_irqs; i += 4)
vgic_set_target_reg(kvm, 0, i);

kvm->arch.vgic.ready = true;
--
2.0.4