[PATCH v4 02/20] target/riscv: remove MISA properties from isa_edata_arr[]

[Daniel Henrique Barboza]

The code that disables extensions if there's a priv version mismatch
uses cpu->cfg.ext_N properties to do its job.

We're aiming to not rely on cpu->cfg.ext_N props for MISA bits. Split
the MISA related verifications in a new function, removing it from
isa_edata_arr[].

We're also erroring it out instead of disabling, making the cpu_init()
function responsible for running an adequate priv spec for the MISA
extensions it wants to use.

Note that the RVV verification is being ignored since we're always have
at least PRIV_VERSION_1_10_0.

Signed-off-by: Daniel Henrique Barboza <dbarb...@ventanamicro.com>
Reviewed-by: Weiwei Li <liwei...@iscas.ac.cn>
Reviewed-by: Alistair Francis <alistair.fran...@wdc.com>
---
 target/riscv/cpu.c | 19 +++++++++++++++++--
 1 file changed, 17 insertions(+), 2 deletions(-)

diff --git a/target/riscv/cpu.c b/target/riscv/cpu.c
index 66de3bb33f..ed8f36c649 100644
--- a/target/riscv/cpu.c
+++ b/target/riscv/cpu.c
@@ -72,10 +72,11 @@ struct isa_ext_data {
  * 4. Non-standard extensions (starts with 'X') must be listed after all
  *    standard extensions. They must be separated from other multi-letter
  *    extensions by an underscore.
+ *
+ * Single letter extensions are checked in riscv_cpu_validate_misa_priv()
+ * instead.
  */
 static const struct isa_ext_data isa_edata_arr[] = {
-    ISA_EXT_DATA_ENTRY(h, false, PRIV_VERSION_1_12_0, ext_h),
-    ISA_EXT_DATA_ENTRY(v, false, PRIV_VERSION_1_10_0, ext_v),
     ISA_EXT_DATA_ENTRY(zicbom, true, PRIV_VERSION_1_12_0, ext_icbom),
     ISA_EXT_DATA_ENTRY(zicboz, true, PRIV_VERSION_1_12_0, ext_icboz),
     ISA_EXT_DATA_ENTRY(zicond, true, PRIV_VERSION_1_12_0, ext_zicond),
@@ -1191,6 +1192,14 @@ static void riscv_cpu_sync_misa_cfg(CPURISCVState *env)
     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) {
+        error_setg(errp, "H extension requires priv spec 1.12.0");
+        return;
+    }
+}
+
 static void riscv_cpu_realize(DeviceState *dev, Error **errp)
 {
     CPUState *cs = CPU(dev);
@@ -1234,6 +1243,12 @@ static void riscv_cpu_realize(DeviceState *dev, Error 
**errp)
      */
     riscv_cpu_sync_misa_cfg(env);
 
+    riscv_cpu_validate_misa_priv(env, &local_err);
+    if (local_err != NULL) {
+        error_propagate(errp, local_err);
+        return;
+    }
+
     /* Force disable extensions if priv spec version does not match */
     for (i = 0; i < ARRAY_SIZE(isa_edata_arr); i++) {
         if (isa_ext_is_enabled(cpu, &isa_edata_arr[i]) &&
-- 
2.39.2