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authorPeter Maydell <peter.maydell@linaro.org>2014-12-11 12:07:53 +0000
committerPeter Maydell <peter.maydell@linaro.org>2014-12-11 12:07:53 +0000
commit72149414e25784de60b821fe67c56108a5b03ce1 (patch)
tree19cdf4b7e4e0249d43d1ba578d79aae4a2640eb1 /hw/intc
parenta554ecb49d0021fd8bb0fd4f2f6be807b3c8b54f (diff)
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arm_gic_kvm: Tell kernel about number of IRQs
Newer kernels support a device attribute on the GIC which allows us to tell it how many IRQs this GIC instance is configured with; use it, if it exists. Signed-off-by: Peter Maydell <peter.maydell@linaro.org> Reviewed-by: Christoffer Dall <christoffer.dall@linaro.org> Message-id: 1417718679-1071-1-git-send-email-peter.maydell@linaro.org
Diffstat (limited to 'hw/intc')
-rw-r--r--hw/intc/arm_gic_kvm.c20
1 files changed, 20 insertions, 0 deletions
diff --git a/hw/intc/arm_gic_kvm.c b/hw/intc/arm_gic_kvm.c
index 5038885..1ad3eb0 100644
--- a/hw/intc/arm_gic_kvm.c
+++ b/hw/intc/arm_gic_kvm.c
@@ -92,6 +92,21 @@ static bool kvm_arm_gic_can_save_restore(GICState *s)
return s->dev_fd >= 0;
}
+static bool kvm_gic_supports_attr(GICState *s, int group, int attrnum)
+{
+ struct kvm_device_attr attr = {
+ .group = group,
+ .attr = attrnum,
+ .flags = 0,
+ };
+
+ if (s->dev_fd == -1) {
+ return false;
+ }
+
+ return kvm_device_ioctl(s->dev_fd, KVM_HAS_DEVICE_ATTR, &attr) == 0;
+}
+
static void kvm_gic_access(GICState *s, int group, int offset,
int cpu, uint32_t *val, bool write)
{
@@ -553,6 +568,11 @@ static void kvm_arm_gic_realize(DeviceState *dev, Error **errp)
return;
}
+ if (kvm_gic_supports_attr(s, KVM_DEV_ARM_VGIC_GRP_NR_IRQS, 0)) {
+ uint32_t numirqs = s->num_irq;
+ kvm_gic_access(s, KVM_DEV_ARM_VGIC_GRP_NR_IRQS, 0, 0, &numirqs, 1);
+ }
+
/* Distributor */
memory_region_init_reservation(&s->iomem, OBJECT(s),
"kvm-gic_dist", 0x1000);