target-ppc: Slim conversion of model definitions to QOM subclasses

Since the model list is highly macrofied, keep ppc_def_t for now and
save a pointer to it in PowerPCCPUClass. This results in a flat list of
subclasses including aliases, to be refined later.

Move cpu_ppc_init() to translate_init.c and drop helper.c.
Long-term the idea is to turn translate_init.c into a standalone cpu.c.

Inline cpu_ppc_usable() into type registration.

Split cpu_ppc_register() in two by code movement into the initfn and
by turning the remaining part into a realizefn.
Move qemu_init_vcpu() call into the new realizefn and adapt
create_ppc_opcodes() to return an Error.

Change ppc_find_by_pvr() -> ppc_cpu_class_by_pvr().
Change ppc_find_by_name() -> ppc_cpu_class_by_name().

Turn -cpu host into its own subclass. This requires to move the
kvm_enabled() check in ppc_cpu_class_by_name() to avoid the class being
found via the normal name lookup in the !kvm_enabled() case.
Turn kvmppc_host_cpu_def() into the class_init and add an initfn that
asserts KVM is in fact enabled.

Implement -cpu ? and the QMP equivalent in terms of subclasses.
This newly exposes -cpu host to the user, ordered last for -cpu ?.

Signed-off-by: Andreas Färber <afaerber@suse.de>
Signed-off-by: Alexander Graf <agraf@suse.de>

target-ppc/Makefile.objs

@@ -1,7 +1,6 @@
-obj-y += translate.o helper.o
+obj-y += translate.o
 obj-$(CONFIG_SOFTMMU) += machine.o
 obj-$(CONFIG_KVM) += kvm.o kvm_ppc.o
-obj-y += helper.o
 obj-y += excp_helper.o
 obj-y += fpu_helper.o
 obj-y += int_helper.o

target-ppc/cpu-qom.h

@@ -50,6 +50,9 @@ typedef struct PowerPCCPUClass {
     /*< public >*/
 
     void (*parent_reset)(CPUState *cpu);
+
+    /* TODO inline fields here */
+    ppc_def_t *info;
 } PowerPCCPUClass;
 
 /**
@@ -73,5 +76,7 @@ static inline PowerPCCPU *ppc_env_get_cpu(CPUPPCState *env)
 
 #define ENV_GET_CPU(e) CPU(ppc_env_get_cpu(e))
 
+PowerPCCPUClass *ppc_cpu_class_by_pvr(uint32_t pvr);
+
 
 #endif

target-ppc/cpu.h

@@ -1158,10 +1158,6 @@ void ppc_store_msr (CPUPPCState *env, target_ulong value);
 
 void ppc_cpu_list (FILE *f, fprintf_function cpu_fprintf);
 
-const ppc_def_t *ppc_find_by_pvr(uint32_t pvr);
-const ppc_def_t *cpu_ppc_find_by_name (const char *name);
-int cpu_ppc_register_internal (CPUPPCState *env, const ppc_def_t *def);
-
 /* Time-base and decrementer management */
 #ifndef NO_CPU_IO_DEFS
 uint64_t cpu_ppc_load_tbl (CPUPPCState *env);

target-ppc/kvm.c

@@ -1230,18 +1230,29 @@ static void alter_insns(uint64_t *word, uint64_t flags, bool on)
     }
 }
 
-const ppc_def_t *kvmppc_host_cpu_def(void)
+static void kvmppc_host_cpu_initfn(Object *obj)
 {
+    assert(kvm_enabled());
+}
+
+static void kvmppc_host_cpu_class_init(ObjectClass *oc, void *data)
+{
+    PowerPCCPUClass *pcc = POWERPC_CPU_CLASS(oc);
     uint32_t host_pvr = mfpvr();
-    const ppc_def_t *base_spec;
+    PowerPCCPUClass *pvr_pcc;
     ppc_def_t *spec;
     uint32_t vmx = kvmppc_get_vmx();
     uint32_t dfp = kvmppc_get_dfp();
 
-    base_spec = ppc_find_by_pvr(host_pvr);
-
     spec = g_malloc0(sizeof(*spec));
-    memcpy(spec, base_spec, sizeof(*spec));
+
+    pvr_pcc = ppc_cpu_class_by_pvr(host_pvr);
+    if (pvr_pcc != NULL) {
+        memcpy(spec, pvr_pcc->info, sizeof(*spec));
+    }
+    pcc->info = spec;
+    /* Override the display name for -cpu ? and QMP */
+    pcc->info->name = "host";
 
     /* Now fix up the spec with information we can query from the host */
 
@@ -1254,8 +1265,6 @@ const ppc_def_t *kvmppc_host_cpu_def(void)
         /* Only override when we know what the host supports */
         alter_insns(&spec->insns_flags2, PPC2_DFP, dfp);
     }
-
-    return spec;
 }
 
 int kvmppc_fixup_cpu(CPUPPCState *env)
@@ -1285,3 +1294,17 @@ int kvm_arch_on_sigbus(int code, void *addr)
 {
     return 1;
 }
+
+static const TypeInfo kvm_host_cpu_type_info = {
+    .name = TYPE_HOST_POWERPC_CPU,
+    .parent = TYPE_POWERPC_CPU,
+    .instance_init = kvmppc_host_cpu_initfn,
+    .class_init = kvmppc_host_cpu_class_init,
+};
+
+static void kvm_ppc_register_types(void)
+{
+    type_register_static(&kvm_host_cpu_type_info);
+}
+
+type_init(kvm_ppc_register_types)

target-ppc/kvm_ppc.h

@@ -11,6 +11,8 @@
 
 #include "exec/memory.h"
 
+#define TYPE_HOST_POWERPC_CPU "host-" TYPE_POWERPC_CPU
+
 void kvmppc_init(void);
 
 #ifdef CONFIG_KVM
@@ -31,7 +33,6 @@ int kvmppc_remove_spapr_tce(void *table, int pfd, uint32_t window_size);
 int kvmppc_reset_htab(int shift_hint);
 uint64_t kvmppc_rma_size(uint64_t current_size, unsigned int hash_shift);
 #endif /* !CONFIG_USER_ONLY */
-const ppc_def_t *kvmppc_host_cpu_def(void);
 int kvmppc_fixup_cpu(CPUPPCState *env);
 
 #else
@@ -121,11 +122,6 @@ static inline int kvmppc_update_sdr1(CPUPPCState *env)
 
 #endif /* !CONFIG_USER_ONLY */
 
-static inline const ppc_def_t *kvmppc_host_cpu_def(void)
-{
-    return NULL;
-}
-
 static inline int kvmppc_fixup_cpu(CPUPPCState *env)
 {
     return -1;