[Qemu-devel] [RFC v2 4/7] hw/intc/arm_gicv3_kvm: Get prepared to handle multiple redist regions

[Eric Auger <eric.auger@redhat.com>]

Let's check if KVM_VGIC_V3_ADDR_TYPE_REDIST_REGION is supported.
If not, we check the number of redist region is equal to 1 and use the
legacy KVM_VGIC_V3_ADDR_TYPE_REDIST attribute. Otherwise we use
the new attribute and allow to register multiple regions to the
KVM device.

Signed-off-by: Eric Auger <eric.auger@redhat.com>
---
 hw/intc/arm_gicv3_kvm.c | 31 ++++++++++++++++++++++++++++---
 1 file changed, 28 insertions(+), 3 deletions(-)

diff --git a/hw/intc/arm_gicv3_kvm.c b/hw/intc/arm_gicv3_kvm.c
index 7e76b87..1b32804 100644
--- a/hw/intc/arm_gicv3_kvm.c
+++ b/hw/intc/arm_gicv3_kvm.c
@@ -714,6 +714,7 @@ static void kvm_arm_gicv3_realize(DeviceState *dev, Error **errp)
 {
     GICv3State *s = KVM_ARM_GICV3(dev);
     KVMARMGICv3Class *kgc = KVM_ARM_GICV3_GET_CLASS(s);
+    bool multiple_redist_region_allowed;
     Error *local_err = NULL;
     int i;
 
@@ -750,6 +751,18 @@ static void kvm_arm_gicv3_realize(DeviceState *dev, Error **errp)
         return;
     }
 
+    multiple_redist_region_allowed =
+        kvm_device_check_attr(s->dev_fd, KVM_DEV_ARM_VGIC_GRP_ADDR,
+                              KVM_VGIC_V3_ADDR_TYPE_REDIST_REGION);
+
+    if (!multiple_redist_region_allowed && s->nb_redist_regions > 1) {
+        error_setg(errp, "Multiple VGICv3 redistributor regions are not "
+                   "supported by this host kernel");
+        error_append_hint(errp, "A maximum of %d VCPUs can be used",
+                          s->redist_region_count[0]);
+        return;
+    }
+
     kvm_device_access(s->dev_fd, KVM_DEV_ARM_VGIC_GRP_NR_IRQS,
                       0, &s->num_irq, true, &error_abort);
 
@@ -759,9 +772,21 @@ static void kvm_arm_gicv3_realize(DeviceState *dev, Error **errp)
 
     kvm_arm_register_device(&s->iomem_dist, -1, KVM_DEV_ARM_VGIC_GRP_ADDR,
                             KVM_VGIC_V3_ADDR_TYPE_DIST, s->dev_fd, 0);
-    kvm_arm_register_device(&s->iomem_redist[0], -1,
-                            KVM_DEV_ARM_VGIC_GRP_ADDR,
-                            KVM_VGIC_V3_ADDR_TYPE_REDIST, s->dev_fd, 0);
+
+    if (!multiple_redist_region_allowed) {
+        kvm_arm_register_device(&s->iomem_redist[0], -1,
+                                KVM_DEV_ARM_VGIC_GRP_ADDR,
+                                KVM_VGIC_V3_ADDR_TYPE_REDIST, s->dev_fd, 0);
+    } else {
+        for (i = s->nb_redist_regions; i >= 0; i--) {
+            uint64_t val = i | ((uint64_t)s->redist_region_count[i] << 52);
+
+            kvm_arm_register_device(&s->iomem_redist[i], -1,
+                                    KVM_DEV_ARM_VGIC_GRP_ADDR,
+                                    KVM_VGIC_V3_ADDR_TYPE_REDIST_REGION,
+                                    s->dev_fd, val);
+        }
+    }
 
     if (kvm_has_gsi_routing()) {
         /* set up irq routing */
-- 
2.5.5