spapr: Add cpu_apply hook to capabilities

spapr capabilities have an apply hook to actually activate (or deactivate)
the feature in the system at reset time.  However, a number of capabilities
affect the setup of cpus, and need to be applied to each of them -
including hotplugged cpus for extra complication.  To make this simpler,
add an optional cpu_apply hook that is called from spapr_cpu_reset().

Signed-off-by: David Gibson <david@gibson.dropbear.id.au>
Reviewed-by: Greg Kurz <groug@kaod.org>
Reviewed-by: Cédric Le Goater <clg@kaod.org>

hw/ppc/spapr_caps.c

@@ -59,6 +59,8 @@ typedef struct sPAPRCapabilityInfo {
     sPAPRCapPossible *possible;
     /* Make sure the virtual hardware can support this capability */
     void (*apply)(sPAPRMachineState *spapr, uint8_t val, Error **errp);
+    void (*cpu_apply)(sPAPRMachineState *spapr, PowerPCCPU *cpu,
+                      uint8_t val, Error **errp);
 } sPAPRCapabilityInfo;
 
 static void spapr_cap_get_bool(Object *obj, Visitor *v, const char *name,
@@ -472,6 +474,23 @@ void spapr_caps_apply(sPAPRMachineState *spapr)
     }
 }
 
+void spapr_caps_cpu_apply(sPAPRMachineState *spapr, PowerPCCPU *cpu)
+{
+    int i;
+
+    for (i = 0; i < SPAPR_CAP_NUM; i++) {
+        sPAPRCapabilityInfo *info = &capability_table[i];
+
+        /*
+         * If the apply function can't set the desired level and thinks it's
+         * fatal, it should cause that.
+         */
+        if (info->cpu_apply) {
+            info->cpu_apply(spapr, cpu, spapr->eff.caps[i], &error_fatal);
+        }
+    }
+}
+
 void spapr_caps_add_properties(sPAPRMachineClass *smc, Error **errp)
 {
     Error *local_err = NULL;

hw/ppc/spapr_cpu_core.c

@@ -76,6 +76,8 @@ static void spapr_cpu_reset(void *opaque)
     spapr_cpu->slb_shadow_size = 0;
     spapr_cpu->dtl_addr = 0;
     spapr_cpu->dtl_size = 0;
+
+    spapr_caps_cpu_apply(SPAPR_MACHINE(qdev_get_machine()), cpu);
 }
 
 void spapr_cpu_set_entry_state(PowerPCCPU *cpu, target_ulong nip, target_ulong r3)

include/hw/ppc/spapr.h

@@ -800,6 +800,7 @@ static inline uint8_t spapr_get_cap(sPAPRMachineState *spapr, int cap)
 
 void spapr_caps_init(sPAPRMachineState *spapr);
 void spapr_caps_apply(sPAPRMachineState *spapr);
+void spapr_caps_cpu_apply(sPAPRMachineState *spapr, PowerPCCPU *cpu);
 void spapr_caps_add_properties(sPAPRMachineClass *smc, Error **errp);
 int spapr_caps_post_migration(sPAPRMachineState *spapr);