target/riscv: remove riscv_cpu_sync_misa_cfg()

This function was created to move the sync between cpu->cfg.ext_N bit
changes to env->misa_ext* from the validation step to an ealier step,
giving us a guarantee that we could use either cpu->cfg.ext_N or
riscv_has_ext(env,N) in the validation.

We don't have any cpu->cfg.ext_N left that has an existing MISA bit
(cfg.ext_g will be handled shortly). The function is now a no-op, simply
copying the existing values of misa_ext* back to misa_ext*.

Remove it.

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>
Message-Id: <20230406180351.570807-18-dbarboza@ventanamicro.com>
Signed-off-by: Alistair Francis <alistair.francis@wdc.com>

target/riscv/cpu.c

@@ -1141,50 +1141,6 @@ static void riscv_cpu_finalize_features(RISCVCPU *cpu, Error **errp)
 #endif
 }
 
-static void riscv_cpu_sync_misa_cfg(CPURISCVState *env)
-{
-    uint32_t ext = 0;
-
-    if (riscv_has_ext(env, RVI)) {
-        ext |= RVI;
-    }
-    if (riscv_has_ext(env, RVE)) {
-        ext |= RVE;
-    }
-    if (riscv_has_ext(env, RVM)) {
-        ext |= RVM;
-    }
-    if (riscv_has_ext(env, RVA)) {
-        ext |= RVA;
-    }
-    if (riscv_has_ext(env, RVF)) {
-        ext |= RVF;
-    }
-    if (riscv_has_ext(env, RVD)) {
-        ext |= RVD;
-    }
-    if (riscv_has_ext(env, RVC)) {
-        ext |= RVC;
-    }
-    if (riscv_has_ext(env, RVS)) {
-        ext |= RVS;
-    }
-    if (riscv_has_ext(env, RVU)) {
-        ext |= RVU;
-    }
-    if (riscv_has_ext(env, RVH)) {
-        ext |= RVH;
-    }
-    if (riscv_has_ext(env, RVV)) {
-        ext |= RVV;
-    }
-    if (riscv_has_ext(env, RVJ)) {
-        ext |= RVJ;
-    }
-
-    env->misa_ext = env->misa_ext_mask = ext;
-}
-
 static void riscv_cpu_validate_misa_priv(CPURISCVState *env, Error **errp)
 {
     if (riscv_has_ext(env, RVH) && env->priv_ver < PRIV_VERSION_1_12_0) {
@@ -1228,14 +1184,6 @@ static void riscv_cpu_realize(DeviceState *dev, Error **errp)
         set_priv_version(env, priv_version);
     }
 
-    /*
-     * We can't be sure of whether we set defaults during cpu_init()
-     * or whether the user enabled/disabled some bits via cpu->cfg
-     * flags. Sync env->misa_ext with cpu->cfg now to allow us to
-     * use just env->misa_ext later.
-     */
-    riscv_cpu_sync_misa_cfg(env);
-
     riscv_cpu_validate_misa_priv(env, &local_err);
     if (local_err != NULL) {
         error_propagate(errp, local_err);