[PATCH v3 2/3] target/riscv: Add support for Zve64x extension

[Jason Chien]

Add support for Zve64x extension. Enabling Zve64f enables Zve64x and
enabling Zve64x enables Zve32x according to their dependency.

Resolves: https://gitlab.com/qemu-project/qemu/-/issues/2107
Signed-off-by: Jason Chien <jason.chien@sifive.com>
Reviewed-by: Frank Chang <frank.chang@sifive.com>
Reviewed-by: Max Chou <max.chou@sifive.com>
Reviewed-by: Daniel Henrique Barboza <dbarboza@ventanamicro.com>
---
 target/riscv/cpu.c         |  2 ++
 target/riscv/cpu_cfg.h     |  1 +
 target/riscv/tcg/tcg-cpu.c | 17 +++++++++++------
 3 files changed, 14 insertions(+), 6 deletions(-)

diff --git a/target/riscv/cpu.c b/target/riscv/cpu.c
index 6bd8798bb5..18e1ae66f4 100644
--- a/target/riscv/cpu.c
+++ b/target/riscv/cpu.c
@@ -156,6 +156,7 @@ const RISCVIsaExtData isa_edata_arr[] = {
     ISA_EXT_DATA_ENTRY(zve32x, PRIV_VERSION_1_10_0, ext_zve32x),
     ISA_EXT_DATA_ENTRY(zve64f, PRIV_VERSION_1_10_0, ext_zve64f),
     ISA_EXT_DATA_ENTRY(zve64d, PRIV_VERSION_1_10_0, ext_zve64d),
+    ISA_EXT_DATA_ENTRY(zve64x, PRIV_VERSION_1_10_0, ext_zve64x),
     ISA_EXT_DATA_ENTRY(zvfbfmin, PRIV_VERSION_1_12_0, ext_zvfbfmin),
     ISA_EXT_DATA_ENTRY(zvfbfwma, PRIV_VERSION_1_12_0, ext_zvfbfwma),
     ISA_EXT_DATA_ENTRY(zvfh, PRIV_VERSION_1_12_0, ext_zvfh),
@@ -1476,6 +1477,7 @@ const RISCVCPUMultiExtConfig riscv_cpu_extensions[] = {
     MULTI_EXT_CFG_BOOL("zve32x", ext_zve32x, false),
     MULTI_EXT_CFG_BOOL("zve64f", ext_zve64f, false),
     MULTI_EXT_CFG_BOOL("zve64d", ext_zve64d, false),
+    MULTI_EXT_CFG_BOOL("zve64x", ext_zve64x, false),
     MULTI_EXT_CFG_BOOL("zvfbfmin", ext_zvfbfmin, false),
     MULTI_EXT_CFG_BOOL("zvfbfwma", ext_zvfbfwma, false),
     MULTI_EXT_CFG_BOOL("zvfh", ext_zvfh, false),
diff --git a/target/riscv/cpu_cfg.h b/target/riscv/cpu_cfg.h
index dce49050c0..e1e4f32698 100644
--- a/target/riscv/cpu_cfg.h
+++ b/target/riscv/cpu_cfg.h
@@ -94,6 +94,7 @@ struct RISCVCPUConfig {
     bool ext_zve32x;
     bool ext_zve64f;
     bool ext_zve64d;
+    bool ext_zve64x;
     bool ext_zvbb;
     bool ext_zvbc;
     bool ext_zvkb;
diff --git a/target/riscv/tcg/tcg-cpu.c b/target/riscv/tcg/tcg-cpu.c
index ff0d485e7f..4ebebebe09 100644
--- a/target/riscv/tcg/tcg-cpu.c
+++ b/target/riscv/tcg/tcg-cpu.c
@@ -498,17 +498,22 @@ void riscv_cpu_validate_set_extensions(RISCVCPU *cpu, 
Error **errp)
 
     /* The Zve64d extension depends on the Zve64f extension */
     if (cpu->cfg.ext_zve64d) {
+        if (!riscv_has_ext(env, RVD)) {
+            error_setg(errp, "Zve64d/V extensions require D extension");
+            return;
+        }
         cpu_cfg_ext_auto_update(cpu, CPU_CFG_OFFSET(ext_zve64f), true);
     }
 
-    /* The Zve64f extension depends on the Zve32f extension */
+    /* The Zve64f extension depends on the Zve64x and Zve32f extensions */
     if (cpu->cfg.ext_zve64f) {
+        cpu_cfg_ext_auto_update(cpu, CPU_CFG_OFFSET(ext_zve64x), true);
         cpu_cfg_ext_auto_update(cpu, CPU_CFG_OFFSET(ext_zve32f), true);
     }
 
-    if (cpu->cfg.ext_zve64d && !riscv_has_ext(env, RVD)) {
-        error_setg(errp, "Zve64d/V extensions require D extension");
-        return;
+    /* The Zve64x extension depends on the Zve32x extension */
+    if (cpu->cfg.ext_zve64x) {
+        cpu_cfg_ext_auto_update(cpu, CPU_CFG_OFFSET(ext_zve32x), true);
     }
 
     /* The Zve32f extension depends on the Zve32x extension */
@@ -670,10 +675,10 @@ void riscv_cpu_validate_set_extensions(RISCVCPU *cpu, 
Error **errp)
         return;
     }
 
-    if ((cpu->cfg.ext_zvbc || cpu->cfg.ext_zvknhb) && !cpu->cfg.ext_zve64f) {
+    if ((cpu->cfg.ext_zvbc || cpu->cfg.ext_zvknhb) && !cpu->cfg.ext_zve64x) {
         error_setg(
             errp,
-            "Zvbc and Zvknhb extensions require V or Zve64{f,d} extensions");
+            "Zvbc and Zvknhb extensions require V or Zve64x extensions");
         return;
     }
 
-- 
2.43.2