[PULL 43/61] target/riscv: Create xl field in env

[Alistair Francis]

From: LIU Zhiwei <zhiwei_liu@c-sky.com>

Current xlen has been used in helper functions and many other places.
The computation of current xlen is not so trivial, so that we should
recompute it as little as possible.

Fortunately, xlen only changes in very seldom cases, such as exception,
misa write, mstatus write, cpu reset, migration load. So that we can only
recompute xlen in this places and cache it into CPURISCVState.

Signed-off-by: LIU Zhiwei <zhiwei_liu@c-sky.com>
Reviewed-by: Alistair Francis <alistair.francis@wdc.com>
Message-id: 20220120122050.41546-6-zhiwei_liu@c-sky.com
Signed-off-by: Alistair Francis <alistair.francis@wdc.com>
---
 target/riscv/cpu.h        | 31 +++++++++++++++++++++++++++++++
 target/riscv/cpu.c        |  1 +
 target/riscv/cpu_helper.c | 34 ++--------------------------------
 target/riscv/csr.c        |  2 ++
 target/riscv/machine.c    | 10 ++++++++++
 5 files changed, 46 insertions(+), 32 deletions(-)

diff --git a/target/riscv/cpu.h b/target/riscv/cpu.h
index 03552f4aaa..7657e22a56 100644
--- a/target/riscv/cpu.h
+++ b/target/riscv/cpu.h
@@ -146,6 +146,7 @@ struct CPURISCVState {
     uint32_t misa_mxl_max;  /* max mxl for this cpu */
     uint32_t misa_ext;      /* current extensions */
     uint32_t misa_ext_mask; /* max ext for this cpu */
+    uint32_t xl;            /* current xlen */
 
     /* 128-bit helpers upper part return value */
     target_ulong retxh;
@@ -456,6 +457,36 @@ static inline RISCVMXL riscv_cpu_mxl(CPURISCVState *env)
 }
 #endif
 
+#if defined(TARGET_RISCV32)
+#define cpu_recompute_xl(env)  ((void)(env), MXL_RV32)
+#else
+static inline RISCVMXL cpu_recompute_xl(CPURISCVState *env)
+{
+    RISCVMXL xl = env->misa_mxl;
+#if !defined(CONFIG_USER_ONLY)
+    /*
+     * When emulating a 32-bit-only cpu, use RV32.
+     * When emulating a 64-bit cpu, and MXL has been reduced to RV32,
+     * MSTATUSH doesn't have UXL/SXL, therefore XLEN cannot be widened
+     * back to RV64 for lower privs.
+     */
+    if (xl != MXL_RV32) {
+        switch (env->priv) {
+        case PRV_M:
+            break;
+        case PRV_U:
+            xl = get_field(env->mstatus, MSTATUS64_UXL);
+            break;
+        default: /* PRV_S | PRV_H */
+            xl = get_field(env->mstatus, MSTATUS64_SXL);
+            break;
+        }
+    }
+#endif
+    return xl;
+}
+#endif
+
 /*
  * Encode LMUL to lmul as follows:
  *     LMUL    vlmul    lmul
diff --git a/target/riscv/cpu.c b/target/riscv/cpu.c
index c2b570e904..736cf1d4e7 100644
--- a/target/riscv/cpu.c
+++ b/target/riscv/cpu.c
@@ -413,6 +413,7 @@ static void riscv_cpu_reset(DeviceState *dev)
     /* mmte is supposed to have pm.current hardwired to 1 */
     env->mmte |= (PM_EXT_INITIAL | MMTE_M_PM_CURRENT);
 #endif
+    env->xl = riscv_cpu_mxl(env);
     cs->exception_index = RISCV_EXCP_NONE;
     env->load_res = -1;
     set_default_nan_mode(1, &env->fp_status);
diff --git a/target/riscv/cpu_helper.c b/target/riscv/cpu_helper.c
index afee770951..8ebcd57af0 100644
--- a/target/riscv/cpu_helper.c
+++ b/target/riscv/cpu_helper.c
@@ -35,37 +35,6 @@ int riscv_cpu_mmu_index(CPURISCVState *env, bool ifetch)
 #endif
 }
 
-static RISCVMXL cpu_get_xl(CPURISCVState *env)
-{
-#if defined(TARGET_RISCV32)
-    return MXL_RV32;
-#elif defined(CONFIG_USER_ONLY)
-    return MXL_RV64;
-#else
-    RISCVMXL xl = riscv_cpu_mxl(env);
-
-    /*
-     * When emulating a 32-bit-only cpu, use RV32.
-     * When emulating a 64-bit cpu, and MXL has been reduced to RV32,
-     * MSTATUSH doesn't have UXL/SXL, therefore XLEN cannot be widened
-     * back to RV64 for lower privs.
-     */
-    if (xl != MXL_RV32) {
-        switch (env->priv) {
-        case PRV_M:
-            break;
-        case PRV_U:
-            xl = get_field(env->mstatus, MSTATUS64_UXL);
-            break;
-        default: /* PRV_S | PRV_H */
-            xl = get_field(env->mstatus, MSTATUS64_SXL);
-            break;
-        }
-    }
-    return xl;
-#endif
-}
-
 void cpu_get_tb_cpu_state(CPURISCVState *env, target_ulong *pc,
                           target_ulong *cs_base, uint32_t *pflags)
 {
@@ -148,7 +117,7 @@ void cpu_get_tb_cpu_state(CPURISCVState *env, target_ulong 
*pc,
     }
 #endif
 
-    flags = FIELD_DP32(flags, TB_FLAGS, XL, cpu_get_xl(env));
+    flags = FIELD_DP32(flags, TB_FLAGS, XL, env->xl);
 
     *pflags = flags;
 }
@@ -364,6 +333,7 @@ void riscv_cpu_set_mode(CPURISCVState *env, target_ulong 
newpriv)
     }
     /* tlb_flush is unnecessary as mode is contained in mmu_idx */
     env->priv = newpriv;
+    env->xl = cpu_recompute_xl(env);
 
     /*
      * Clear the load reservation - otherwise a reservation placed in one
diff --git a/target/riscv/csr.c b/target/riscv/csr.c
index 6bc7ee780c..9be2820d2b 100644
--- a/target/riscv/csr.c
+++ b/target/riscv/csr.c
@@ -589,6 +589,7 @@ static RISCVException write_mstatus(CPURISCVState *env, int 
csrno,
         mstatus = set_field(mstatus, MSTATUS64_UXL, xl);
     }
     env->mstatus = mstatus;
+    env->xl = cpu_recompute_xl(env);
 
     return RISCV_EXCP_NONE;
 }
@@ -704,6 +705,7 @@ static RISCVException write_misa(CPURISCVState *env, int 
csrno,
     /* flush translation cache */
     tb_flush(env_cpu(env));
     env->misa_ext = val;
+    env->xl = riscv_cpu_mxl(env);
     return RISCV_EXCP_NONE;
 }
 
diff --git a/target/riscv/machine.c b/target/riscv/machine.c
index 098670e680..b76e4db99c 100644
--- a/target/riscv/machine.c
+++ b/target/riscv/machine.c
@@ -214,10 +214,20 @@ static const VMStateDescription vmstate_kvmtimer = {
     }
 };
 
+static int riscv_cpu_post_load(void *opaque, int version_id)
+{
+    RISCVCPU *cpu = opaque;
+    CPURISCVState *env = &cpu->env;
+
+    env->xl = cpu_recompute_xl(env);
+    return 0;
+}
+
 const VMStateDescription vmstate_riscv_cpu = {
     .name = "cpu",
     .version_id = 3,
     .minimum_version_id = 3,
+    .post_load = riscv_cpu_post_load,
     .fields = (VMStateField[]) {
         VMSTATE_UINTTL_ARRAY(env.gpr, RISCVCPU, 32),
         VMSTATE_UINT64_ARRAY(env.fpr, RISCVCPU, 32),
-- 
2.31.1