Revert "xen/arm: vgic-v3: Delay the initialization of the domain information"

This reverts commit 703d9d5ec1.  The domain
creation logic has been adjusted to set up d->max_vcpus early enough to be
usable in vgic_v3_domain_init().

Signed-off-by: Andrew Cooper <andrew.cooper3@citrix.com>
Acked-by: Julien Grall <julien.grall@arm.com>

xen/arch/arm/vgic-v3.c

@@ -1573,11 +1573,9 @@ static const struct mmio_handler_ops vgic_distr_mmio_handler = {
     .write = vgic_v3_distr_mmio_write,
 };
 
-static int vgic_v3_real_domain_init(struct domain *d);
-
 static int vgic_v3_vcpu_init(struct vcpu *v)
 {
-    int i, rc;
+    int i;
     paddr_t rdist_base;
     struct vgic_rdist_region *region;
     unsigned int last_cpu;
@@ -1585,19 +1583,6 @@ static int vgic_v3_vcpu_init(struct vcpu *v)
     /* Convenient alias */
     struct domain *d = v->domain;
 
-    /*
-     * This is the earliest place where the number of vCPUs is
-     * known. This is required to initialize correctly the vGIC v3
-     * domain structure. We only to do that when vCPU 0 is
-     * initilialized.
-     */
-    if ( v->vcpu_id == 0 )
-    {
-        rc = vgic_v3_real_domain_init(d);
-        if ( rc )
-            return rc;
-    }
-
     /*
      * Find the region where the re-distributor lives. For this purpose,
      * we look one region ahead as we have only the first CPU in hand.
@@ -1660,7 +1645,7 @@ static inline unsigned int vgic_v3_max_rdist_count(struct domain *d)
                GUEST_GICV3_RDIST_REGIONS;
 }
 
-static int vgic_v3_real_domain_init(struct domain *d)
+static int vgic_v3_domain_init(struct domain *d)
 {
     struct vgic_rdist_region *rdist_regions;
     int rdist_count, i, ret;
@@ -1763,16 +1748,6 @@ static int vgic_v3_real_domain_init(struct domain *d)
     return 0;
 }
 
-static int vgic_v3_domain_init(struct domain *d)
-{
-    /*
-     * The domain initialization for vGIC v3 is delayed until the first vCPU
-     * is created. This because the initialization may require to know the
-     * number of vCPUs that is not known when creating the domain.
-     */
-    return 0;
-}
-
 static void vgic_v3_domain_free(struct domain *d)
 {
     vgic_v3_its_free_domain(d);