[PATCH v2] target/riscv: zvbb implies zvkb

[Jerry Zhang Jian]

- According to RISC-V crypto spec, Zvkb extension is a proper subset of the 
Zvbb extension.

- Reference: 
https://github.com/riscv/riscv-crypto/blob/1769c2609bf4535632e0c0fd715778f212bb272e/doc/vector/riscv-crypto-vector-zvkb.adoc?plain=1#L10

Signed-off-by: Jerry Zhang Jian <jerry.zhangjian@sifive.com>
---
 target/riscv/tcg/tcg-cpu.c | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/target/riscv/tcg/tcg-cpu.c b/target/riscv/tcg/tcg-cpu.c
index 40054a391a..f1a1306ab2 100644
--- a/target/riscv/tcg/tcg-cpu.c
+++ b/target/riscv/tcg/tcg-cpu.c
@@ -658,6 +658,10 @@ void riscv_cpu_validate_set_extensions(RISCVCPU *cpu, 
Error **errp)
         cpu_cfg_ext_auto_update(cpu, CPU_CFG_OFFSET(ext_zvbc), true);
     }
 
+    if (cpu->cfg.ext_zvbb) {
+        cpu_cfg_ext_auto_update(cpu, CPU_CFG_OFFSET(ext_zvkb), true);
+    }
+
     /*
      * In principle Zve*x would also suffice here, were they supported
      * in qemu
-- 
2.44.0