Create a new "u" RISCVCPUMisaExtConfig property that will update
env->misa_ext* with RVU. Instances of cpu->cfg.ext_u and similar are
replaced with riscv_has_ext(env, RVU).

Remove the old "u" property and 'ext_u' from RISCVCPUConfig.

Signed-off-by: Daniel Henrique Barboza <dbarboza@ventanamicro.com>
Reviewed-by: Weiwei Li <liweiwei@iscas.ac.cn>
Reviewed-by: Alistair Francis <alistair.francis@wdc.com>
---
 target/riscv/cpu.c | 9 ++++-----
 target/riscv/cpu.h | 1 -
 2 files changed, 4 insertions(+), 6 deletions(-)

diff --git a/target/riscv/cpu.c b/target/riscv/cpu.c
index cded82ac7a..9565495839 100644
--- a/target/riscv/cpu.c
+++ b/target/riscv/cpu.c
@@ -407,7 +407,6 @@ static void rv64_thead_c906_cpu_init(Object *obj)
     set_priv_version(env, PRIV_VERSION_1_11_0);
 
     cpu->cfg.ext_g = true;
-    cpu->cfg.ext_u = true;
     cpu->cfg.ext_icsr = true;
     cpu->cfg.ext_zfh = true;
     cpu->cfg.mmu = true;
@@ -842,7 +841,7 @@ static void riscv_cpu_validate_set_extensions(RISCVCPU *cpu, Error **errp)
         return;
     }
 
-    if (riscv_has_ext(env, RVS) && !cpu->cfg.ext_u) {
+    if (riscv_has_ext(env, RVS) && !riscv_has_ext(env, RVU)) {
         error_setg(errp,
                    "Setting S extension without U extension is illegal");
         return;
@@ -1170,7 +1169,7 @@ static void riscv_cpu_sync_misa_cfg(CPURISCVState *env)
     if (riscv_has_ext(env, RVS)) {
         ext |= RVS;
     }
-    if (riscv_cpu_cfg(env)->ext_u) {
+    if (riscv_has_ext(env, RVU)) {
         ext |= RVU;
     }
     if (riscv_cpu_cfg(env)->ext_h) {
@@ -1508,6 +1507,8 @@ static const RISCVCPUMisaExtConfig misa_ext_cfgs[] = {
      .misa_bit = RVM, .enabled = true},
     {.name = "s", .description = "Supervisor-level instructions",
      .misa_bit = RVS, .enabled = true},
+    {.name = "u", .description = "User-level instructions",
+     .misa_bit = RVU, .enabled = true},
 };
 
 static void riscv_cpu_add_misa_properties(Object *cpu_obj)
@@ -1531,7 +1532,6 @@ static void riscv_cpu_add_misa_properties(Object *cpu_obj)
 static Property riscv_cpu_extensions[] = {
     /* Defaults for standard extensions */
     DEFINE_PROP_BOOL("g", RISCVCPU, cfg.ext_g, false),
-    DEFINE_PROP_BOOL("u", RISCVCPU, cfg.ext_u, true),
     DEFINE_PROP_BOOL("v", RISCVCPU, cfg.ext_v, false),
     DEFINE_PROP_BOOL("h", RISCVCPU, cfg.ext_h, true),
     DEFINE_PROP_UINT8("pmu-num", RISCVCPU, cfg.pmu_num, 16),
@@ -1647,7 +1647,6 @@ static void register_cpu_props(Object *obj)
      */
     if (cpu->env.misa_ext != 0) {
         cpu->cfg.ext_v = misa_ext & RVV;
-        cpu->cfg.ext_u = misa_ext & RVU;
         cpu->cfg.ext_h = misa_ext & RVH;
         cpu->cfg.ext_j = misa_ext & RVJ;
 
diff --git a/target/riscv/cpu.h b/target/riscv/cpu.h
index 8b8e541e5f..486061589e 100644
--- a/target/riscv/cpu.h
+++ b/target/riscv/cpu.h
@@ -423,7 +423,6 @@ typedef struct {
 
 struct RISCVCPUConfig {
     bool ext_g;
-    bool ext_u;
     bool ext_h;
     bool ext_j;
     bool ext_v;
-- 
2.39.2