[PATCH v2 7/8] target/riscv: Force disable extensions if priv spec version does not match

[Anup Patel <apatel@ventanamicro.com>]

We should disable extensions in riscv_cpu_realize() if minimum required
priv spec version is not satisfied. This also ensures that machines with
priv spec v1.11 (or lower) cannot enable H, V, and various multi-letter
extensions.

Fixes: a775398be2e ("target/riscv: Add isa extenstion strings to the
device tree")
Signed-off-by: Anup Patel <apatel@ventanamicro.com>
---
 target/riscv/cpu.c | 34 ++++++++++++++++++++++++++++++++++
 1 file changed, 34 insertions(+)

diff --git a/target/riscv/cpu.c b/target/riscv/cpu.c
index f3b61dfd63..25a4ba3e22 100644
--- a/target/riscv/cpu.c
+++ b/target/riscv/cpu.c
@@ -541,6 +541,40 @@ static void riscv_cpu_realize(DeviceState *dev, Error **errp)
         set_priv_version(env, priv_version);
     }
 
+    /* Force disable extensions if priv spec version does not match */
+    if (env->priv_ver < PRIV_VERSION_1_12_0) {
+        cpu->cfg.ext_h = false;
+        cpu->cfg.ext_v = false;
+        cpu->cfg.ext_zfh = false;
+        cpu->cfg.ext_zfhmin = false;
+        cpu->cfg.ext_zfinx = false;
+        cpu->cfg.ext_zhinx = false;
+        cpu->cfg.ext_zhinxmin = false;
+        cpu->cfg.ext_zdinx = false;
+        cpu->cfg.ext_zba = false;
+        cpu->cfg.ext_zbb = false;
+        cpu->cfg.ext_zbc = false;
+        cpu->cfg.ext_zbkb = false;
+        cpu->cfg.ext_zbkc = false;
+        cpu->cfg.ext_zbkx = false;
+        cpu->cfg.ext_zbs = false;
+        cpu->cfg.ext_zk = false;
+        cpu->cfg.ext_zkn = false;
+        cpu->cfg.ext_zknd = false;
+        cpu->cfg.ext_zkne = false;
+        cpu->cfg.ext_zknh = false;
+        cpu->cfg.ext_zkr = false;
+        cpu->cfg.ext_zks = false;
+        cpu->cfg.ext_zksed = false;
+        cpu->cfg.ext_zksh = false;
+        cpu->cfg.ext_zkt = false;
+        cpu->cfg.ext_zve32f = false;
+        cpu->cfg.ext_zve64f = false;
+        cpu->cfg.ext_svinval = false;
+        cpu->cfg.ext_svnapot = false;
+        cpu->cfg.ext_svpbmt = false;
+    }
+
     if (cpu->cfg.mmu) {
         riscv_set_feature(env, RISCV_FEATURE_MMU);
     }
-- 
2.34.1