[Qemu-devel] [RFC for-2.13 4/7] spapr: Add cpu_apply hook to capabilities

[David Gibson <david@gibson.dropbear.id.au>]

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>
---
 hw/ppc/spapr_caps.c     | 19 +++++++++++++++++++
 hw/ppc/spapr_cpu_core.c |  2 ++
 include/hw/ppc/spapr.h  |  1 +
 3 files changed, 22 insertions(+)

diff --git a/hw/ppc/spapr_caps.c b/hw/ppc/spapr_caps.c
index 5762b88689..e71de14ffb 100644
--- a/hw/ppc/spapr_caps.c
+++ b/hw/ppc/spapr_caps.c
@@ -61,6 +61,8 @@ 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,
@@ -547,6 +549,23 @@ void spapr_caps_reset(sPAPRMachineState *spapr)
     }
 }
 
+void spapr_caps_cpu_reset(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;
diff --git a/hw/ppc/spapr_cpu_core.c b/hw/ppc/spapr_cpu_core.c
index 0a668b8954..f041182593 100644
--- a/hw/ppc/spapr_cpu_core.c
+++ b/hw/ppc/spapr_cpu_core.c
@@ -67,6 +67,8 @@ static void spapr_cpu_reset(void *opaque)
 
     /* Set a full AMOR so guest can use the AMR as it sees fit */
     env->spr[SPR_AMOR] = 0xffffffffffffffffull;
+
+    spapr_caps_cpu_reset(SPAPR_MACHINE(qdev_get_machine()), cpu);
 }
 
 void spapr_cpu_set_entry_state(PowerPCCPU *cpu, target_ulong nip, target_ulong r3)
diff --git a/include/hw/ppc/spapr.h b/include/hw/ppc/spapr.h
index a3d616c612..ced3246d0e 100644
--- a/include/hw/ppc/spapr.h
+++ b/include/hw/ppc/spapr.h
@@ -802,6 +802,7 @@ static inline uint8_t spapr_get_cap(sPAPRMachineState *spapr, int cap)
 }
 
 void spapr_caps_reset(sPAPRMachineState *spapr);
+void spapr_caps_cpu_reset(sPAPRMachineState *spapr, PowerPCCPU *cpu);
 void spapr_caps_add_properties(sPAPRMachineClass *smc, Error **errp);
 int spapr_caps_post_migration(sPAPRMachineState *spapr);
 
-- 
2.14.3