Do the same thing we did with 'vlen' in the previous patch with 'elen'.

Signed-off-by: Daniel Henrique Barboza <dbarboza@ventanamicro.com>
---
 target/riscv/cpu.c         | 52 ++++++++++++++++++++++++++++++++++++--
 target/riscv/tcg/tcg-cpu.c |  5 ----
 2 files changed, 50 insertions(+), 7 deletions(-)

diff --git a/target/riscv/cpu.c b/target/riscv/cpu.c
index b75d9dee3c..aec1968cad 100644
--- a/target/riscv/cpu.c
+++ b/target/riscv/cpu.c
@@ -1723,9 +1723,54 @@ const PropertyInfo prop_vlen = {
     .set_default_value = qdev_propinfo_set_default_value_uint,
 };
 
-Property riscv_cpu_options[] = {
-    DEFINE_PROP_UINT16("elen", RISCVCPU, cfg.elen, 64),
+static void prop_elen_set(Object *obj, Visitor *v, const char *name,
+                         void *opaque, Error **errp)
+{
+    RISCVCPU *cpu = RISCV_CPU(obj);
+    uint16_t value;
+
+    if (!visit_type_uint16(v, name, &value, errp)) {
+        return;
+    }
+
+    if (!is_power_of_2(value)) {
+        error_setg(errp, "Vector extension ELEN must be power of 2");
+        return;
+    }
+
+    /* Always allow setting a default value */
+    if (cpu->cfg.elen == 0) {
+        cpu->cfg.elen = value;
+        return;
+    }
+
+    if (value != cpu->cfg.elen && riscv_cpu_is_vendor(obj)) {
+        cpu_set_prop_err(cpu, name, errp);
+        error_append_hint(errp, "Current '%s' val: %u\n",
+                          name, cpu->cfg.elen);
+        return;
+    }
+
+    cpu_option_add_user_setting(name, value);
+    cpu->cfg.elen = value;
+}
+
+static void prop_elen_get(Object *obj, Visitor *v, const char *name,
+                         void *opaque, Error **errp)
+{
+    uint16_t value = RISCV_CPU(obj)->cfg.elen;
 
+    visit_type_uint16(v, name, &value, errp);
+}
+
+const PropertyInfo prop_elen = {
+    .name = "elen",
+    .get = prop_elen_get,
+    .set = prop_elen_set,
+    .set_default_value = qdev_propinfo_set_default_value_uint,
+};
+
+Property riscv_cpu_options[] = {
     DEFINE_PROP_UINT16("cbom_blocksize", RISCVCPU, cfg.cbom_blocksize, 64),
     DEFINE_PROP_UINT16("cboz_blocksize", RISCVCPU, cfg.cboz_blocksize, 64),
 
@@ -1748,6 +1793,9 @@ static Property riscv_cpu_properties[] = {
     {.name = "vlen", .info = &prop_vlen,
      .set_default = true, .defval.u = 128},
 
+    {.name = "elen", .info = &prop_elen,
+     .set_default = true, .defval.u = 64},
+
 #ifndef CONFIG_USER_ONLY
     DEFINE_PROP_UINT64("resetvec", RISCVCPU, env.resetvec, DEFAULT_RSTVEC),
 #endif
diff --git a/target/riscv/tcg/tcg-cpu.c b/target/riscv/tcg/tcg-cpu.c
index 8ec858e096..84064ef7e0 100644
--- a/target/riscv/tcg/tcg-cpu.c
+++ b/target/riscv/tcg/tcg-cpu.c
@@ -185,11 +185,6 @@ static void riscv_cpu_validate_v(CPURISCVState *env, RISCVCPUConfig *cfg,
         return;
     }
 
-    if (!is_power_of_2(cfg->elen)) {
-        error_setg(errp, "Vector extension ELEN must be power of 2");
-        return;
-    }
-
     if (cfg->elen > 64 || cfg->elen < 8) {
         error_setg(errp,
                    "Vector extension implementation only supports ELEN "
-- 
2.43.0