target/riscv/cpu.c: remove cpu->cfg.vlen

There is no need to keep both 'vlen' and 'vlenb'. All existing code
that requires 'vlen' is retrieving it via 'vlenb << 3'.

Signed-off-by: Daniel Henrique Barboza <dbarboza@ventanamicro.com>
Reviewed-by: Richard Henderson <richard.henderson@linaro.org>
Reviewed-by: Alistair Francis <alistair.francis@wdc.com>
Message-ID: <20240122161107.26737-14-dbarboza@ventanamicro.com>
Signed-off-by: Alistair Francis <alistair.francis@wdc.com>

target/riscv/cpu.c

@@ -1324,7 +1324,6 @@ static void riscv_cpu_init(Object *obj)
 
     /* Default values for non-bool cpu properties */
     cpu->cfg.pmu_mask = MAKE_64BIT_MASK(3, 16);
-    cpu->cfg.vlen = 128;
     cpu->cfg.vlenb = 128 >> 3;
     cpu->cfg.elen = 64;
     cpu->cfg.cbom_blocksize = 64;
@@ -1816,22 +1815,21 @@ static void prop_vlen_set(Object *obj, Visitor *v, const char *name,
         return;
     }
 
-    if (value != cpu->cfg.vlen && riscv_cpu_is_vendor(obj)) {
+    if (value != cpu->cfg.vlenb && riscv_cpu_is_vendor(obj)) {
         cpu_set_prop_err(cpu, name, errp);
         error_append_hint(errp, "Current '%s' val: %u\n",
-                          name, cpu->cfg.vlen);
+                          name, cpu->cfg.vlenb << 3);
         return;
     }
 
     cpu_option_add_user_setting(name, value);
-    cpu->cfg.vlen = value;
     cpu->cfg.vlenb = value >> 3;
 }
 
 static void prop_vlen_get(Object *obj, Visitor *v, const char *name,
                          void *opaque, Error **errp)
 {
-    uint16_t value = RISCV_CPU(obj)->cfg.vlen;
+    uint16_t value = RISCV_CPU(obj)->cfg.vlenb << 3;
 
     visit_type_uint16(v, name, &value, errp);
 }

target/riscv/cpu_cfg.h

@@ -139,7 +139,6 @@ struct RISCVCPUConfig {
     bool ext_XVentanaCondOps;
 
     uint32_t pmu_mask;
-    uint16_t vlen;
     uint16_t vlenb;
     uint16_t elen;
     uint16_t cbom_blocksize;

target/riscv/tcg/tcg-cpu.c

@@ -298,7 +298,9 @@ static void riscv_cpu_validate_misa_mxl(RISCVCPU *cpu, Error **errp)
 static void riscv_cpu_validate_v(CPURISCVState *env, RISCVCPUConfig *cfg,
                                  Error **errp)
 {
-    if (cfg->vlen > RV_VLEN_MAX || cfg->vlen < 128) {
+    uint32_t vlen = cfg->vlenb << 3;
+
+    if (vlen > RV_VLEN_MAX || vlen < 128) {
         error_setg(errp,
                    "Vector extension implementation only supports VLEN "
                    "in the range [128, %d]", RV_VLEN_MAX);