target/riscv: move 'pmp' to riscv_cpu_properties[]

Move 'pmp' to riscv_cpu_properties[], creating a new setter() for it
that forbids 'pmp' to be changed in vendor CPUs, like we did with the
'mmu' option.

We'll also have to manually set 'pmp = true' to generic CPUs that were
still relying on the previous default to set it.

Signed-off-by: Daniel Henrique Barboza <dbarboza@ventanamicro.com>
Reviewed-by: Alistair Francis <alistair.francis@wdc.com>
Tested-by: Vladimir Isaev <vladimir.isaev@syntacore.com>
Message-ID: <20240105230546.265053-6-dbarboza@ventanamicro.com>
Signed-off-by: Alistair Francis <alistair.francis@wdc.com>

target/riscv/cpu.c

@@ -438,6 +438,7 @@ static void riscv_max_cpu_init(Object *obj)
     RISCVMXL mlx = MXL_RV64;
 
     cpu->cfg.mmu = true;
+    cpu->cfg.pmp = true;
 
 #ifdef TARGET_RISCV32
     mlx = MXL_RV32;
@@ -457,6 +458,7 @@ static void rv64_base_cpu_init(Object *obj)
     CPURISCVState *env = &cpu->env;
 
     cpu->cfg.mmu = true;
+    cpu->cfg.pmp = true;
 
     /* We set this in the realise function */
     riscv_cpu_set_misa(env, MXL_RV64, 0);
@@ -586,6 +588,7 @@ static void rv128_base_cpu_init(Object *obj)
     }
 
     cpu->cfg.mmu = true;
+    cpu->cfg.pmp = true;
 
     /* We set this in the realise function */
     riscv_cpu_set_misa(env, MXL_RV128, 0);
@@ -624,6 +627,7 @@ static void rv32_base_cpu_init(Object *obj)
     CPURISCVState *env = &cpu->env;
 
     cpu->cfg.mmu = true;
+    cpu->cfg.pmp = true;
 
     /* We set this in the realise function */
     riscv_cpu_set_misa(env, MXL_RV32, 0);
@@ -1651,9 +1655,38 @@ static const PropertyInfo prop_mmu = {
     .set = prop_mmu_set,
 };
 
-Property riscv_cpu_options[] = {
-    DEFINE_PROP_BOOL("pmp", RISCVCPU, cfg.pmp, true),
+static void prop_pmp_set(Object *obj, Visitor *v, const char *name,
+                         void *opaque, Error **errp)
+{
+    RISCVCPU *cpu = RISCV_CPU(obj);
+    bool value;
+
+    visit_type_bool(v, name, &value, errp);
 
+    if (cpu->cfg.pmp != value && riscv_cpu_is_vendor(obj)) {
+        cpu_set_prop_err(cpu, name, errp);
+        return;
+    }
+
+    cpu_option_add_user_setting(name, value);
+    cpu->cfg.pmp = value;
+}
+
+static void prop_pmp_get(Object *obj, Visitor *v, const char *name,
+                         void *opaque, Error **errp)
+{
+    bool value = RISCV_CPU(obj)->cfg.pmp;
+
+    visit_type_bool(v, name, &value, errp);
+}
+
+static const PropertyInfo prop_pmp = {
+    .name = "pmp",
+    .get = prop_pmp_get,
+    .set = prop_pmp_set,
+};
+
+Property riscv_cpu_options[] = {
     DEFINE_PROP_STRING("priv_spec", RISCVCPU, cfg.priv_spec),
     DEFINE_PROP_STRING("vext_spec", RISCVCPU, cfg.vext_spec),
 
@@ -1741,6 +1774,7 @@ static Property riscv_cpu_properties[] = {
     {.name = "pmu-num", .info = &prop_pmu_num}, /* Deprecated */
 
     {.name = "mmu", .info = &prop_mmu},
+    {.name = "pmp", .info = &prop_pmp},
 
 #ifndef CONFIG_USER_ONLY
     DEFINE_PROP_UINT64("resetvec", RISCVCPU, env.resetvec, DEFAULT_RSTVEC),