xen/arm: vgic: Rename emulate_sysreg callback to emulate_reg

We will want to emulate co-processor registers access in a follow-up
patch.

Signed-off-by: Julien Grall <julien.grall@arm.com>
Reviewed-by: Stefano Stabellini <sstabellini@kernel.org>

xen/arch/arm/vgic-v3.c

@@ -1328,6 +1328,17 @@ static bool vgic_v3_emulate_sysreg(struct cpu_user_regs *regs, union hsr hsr)
     }
 }
 
+static bool vgic_v3_emulate_reg(struct cpu_user_regs *regs, union hsr hsr)
+{
+    switch (hsr.ec)
+    {
+    case HSR_EC_SYSREG:
+        return vgic_v3_emulate_sysreg(regs, hsr);
+    default:
+        return false;
+    }
+}
+
 static const struct mmio_handler_ops vgic_rdistr_mmio_handler = {
     .read  = vgic_v3_rdistr_mmio_read,
     .write = vgic_v3_rdistr_mmio_write,
@@ -1491,7 +1502,7 @@ static const struct vgic_ops v3_ops = {
     .vcpu_init   = vgic_v3_vcpu_init,
     .domain_init = vgic_v3_domain_init,
     .domain_free = vgic_v3_domain_free,
-    .emulate_sysreg  = vgic_v3_emulate_sysreg,
+    .emulate_reg  = vgic_v3_emulate_reg,
     /*
      * We use both AFF1 and AFF0 in (v)MPIDR. Thus, the max number of CPU
      * that can be supported is up to 4096(==256*16) in theory.

xen/arch/arm/vgic.c

@@ -550,9 +550,9 @@ bool vgic_emulate(struct cpu_user_regs *regs, union hsr hsr)
 {
     struct vcpu *v = current;
 
-    ASSERT(v->domain->arch.vgic.handler->emulate_sysreg != NULL);
+    ASSERT(v->domain->arch.vgic.handler->emulate_reg != NULL);
 
-    return v->domain->arch.vgic.handler->emulate_sysreg(regs, hsr);
+    return v->domain->arch.vgic.handler->emulate_reg(regs, hsr);
 }
 
 bool vgic_reserve_virq(struct domain *d, unsigned int virq)

xen/include/asm-arm/vgic.h

@@ -130,8 +130,8 @@ struct vgic_ops {
     int (*domain_init)(struct domain *d);
     /* Release resources that were allocated by domain_init */
     void (*domain_free)(struct domain *d);
-    /* vGIC sysreg emulation */
-    bool (*emulate_sysreg)(struct cpu_user_regs *regs, union hsr hsr);
+    /* vGIC sysreg/cpregs emulate */
+    bool (*emulate_reg)(struct cpu_user_regs *regs, union hsr hsr);
     /* Maximum number of vCPU supported */
     const unsigned int max_vcpus;
 };