xen/arm: Gate GICv3 change with HAS_GICV3 rather than CONFIG_ARM_64...

for clarity and it will be easier to understand some follow-up patches.

Also gate gic_v3 structure with HAS_GICV3.

Signed-off-by: Julien Grall <julien.grall@citrix.com>
Acked-by: Ian Campbell <ian.campbell@citrix.com>

config/arm64.mk

@@ -10,6 +10,7 @@ HAS_PL011 := y
 HAS_CADENCE_UART := y
 HAS_NS16550 := y
 HAS_MEM_ACCESS := y
+HAS_GICV3 := y
 
 # Use only if calling $(LD) directly.
 LDFLAGS_DIRECT += -EL

xen/arch/arm/Makefile

@@ -13,7 +13,7 @@ obj-y += sysctl.o
 obj-y += domain_build.o
 obj-y += gic.o gic-v2.o
 obj-$(CONFIG_ARM_32) += gic-hip04.o
-obj-$(CONFIG_ARM_64) += gic-v3.o
+obj-$(HAS_GICV3) += gic-v3.o
 obj-y += io.o
 obj-y += irq.o
 obj-y += kernel.o

xen/arch/arm/Rules.mk

@@ -38,6 +38,8 @@ ifneq ($(call cc-option,$(CC),-fvisibility=hidden,n),n)
 CFLAGS += -DGCC_HAS_VISIBILITY_ATTRIBUTE
 endif
 
+CFLAGS-$(HAS_GICV3) += -DHAS_GICV3
+
 EARLY_PRINTK := n
 
 ifeq ($(debug),y)

xen/arch/arm/vgic.c

@@ -82,7 +82,7 @@ int domain_vgic_init(struct domain *d, unsigned int nr_spis)
 
     switch ( gic_hw_version() )
     {
-#ifdef CONFIG_ARM_64
+#ifdef HAS_GICV3
     case GIC_V3:
         if ( vgic_v3_init(d) )
            return -ENODEV;

xen/include/asm-arm/domain.h

@@ -101,7 +101,7 @@ struct arch_domain
         /* Base address for guest GIC */
         paddr_t dbase; /* Distributor base address */
         paddr_t cbase; /* CPU base address */
-#ifdef CONFIG_ARM_64
+#ifdef HAS_GICV3
         /* GIC V3 addressing */
         paddr_t dbase_size; /* Distributor base size */
         /* List of contiguous occupied by the redistributors */

xen/include/asm-arm/gic.h

@@ -162,6 +162,7 @@
 
 #define DT_MATCH_GIC_V3 DT_MATCH_COMPATIBLE("arm,gic-v3")
 
+#ifdef HAS_GICV3
 /*
  * GICv3 registers that needs to be saved/restored
  */
@@ -171,6 +172,7 @@ struct gic_v3 {
     uint32_t apr1[4];
     uint64_t lr[16];
 };
+#endif
 
 /*
  * GICv2 register that needs to be saved/restored
@@ -188,7 +190,9 @@ struct gic_v2 {
  */
 union gic_state_data {
     struct gic_v2 v2;
+#ifdef HAS_GICV3
     struct gic_v3 v3;
+#endif
 };
 
 /*