Enable MSA ASE using a CLI flag -cpu <cpu>,msa=on.

Signed-off-by: Aleksandar Rakic <aleksandar.rakic@htecgroup.com>
---
 target/mips/cpu.c      | 16 ++++++++++++++++
 target/mips/cpu.h      |  1 +
 target/mips/internal.h |  2 +-
 3 files changed, 18 insertions(+), 1 deletion(-)

diff --git a/target/mips/cpu.c b/target/mips/cpu.c
index d0a43b6d5c..8e12d303de 100644
--- a/target/mips/cpu.c
+++ b/target/mips/cpu.c
@@ -494,8 +494,24 @@ static void mips_cpu_realizefn(DeviceState *dev, Error **errp)
     mcc->parent_realize(dev, errp);
 }
 
+static bool mips_get_msa_on(Object *obj, Error **errp)
+{
+    MIPSCPU *cpu = MIPS_CPU(obj);
+    CPUMIPSState *env = &cpu->env;
+    return env->msa_on;
+}
+
+static void mips_set_msa_on(Object *obj, bool value, Error **errp)
+{
+    MIPSCPU *cpu = MIPS_CPU(obj);
+    CPUMIPSState *env = &cpu->env;
+    env->msa_on = value;
+}
+
 static void mips_cpu_initfn(Object *obj)
 {
+    object_property_add_bool(obj, "msa", mips_get_msa_on, mips_set_msa_on);
+    object_property_set_bool(obj, "msa", false, NULL);
     MIPSCPU *cpu = MIPS_CPU(obj);
     CPUMIPSState *env = &cpu->env;
     MIPSCPUClass *mcc = MIPS_CPU_GET_CLASS(obj);
diff --git a/target/mips/cpu.h b/target/mips/cpu.h
index f6877ece8b..3e636535c6 100644
--- a/target/mips/cpu.h
+++ b/target/mips/cpu.h
@@ -1191,6 +1191,7 @@ typedef struct CPUArchState {
     QEMUTimer *timer; /* Internal timer */
     Clock *count_clock; /* CP0_Count clock */
     target_ulong exception_base; /* ExceptionBase input to the core */
+    bool msa_on; /* Enable MSA using a CLI flag -cpu ...,msa=on/off */
 } CPUMIPSState;
 
 /**
diff --git a/target/mips/internal.h b/target/mips/internal.h
index 91c786cff8..bbe2acffe2 100644
--- a/target/mips/internal.h
+++ b/target/mips/internal.h
@@ -399,7 +399,7 @@ static inline void compute_hflags(CPUMIPSState *env)
         }
     }
     if (ase_msa_available(env)) {
-        if (env->CP0_Config5 & (1 << CP0C5_MSAEn)) {
+        if ((env->CP0_Config5 & (1 << CP0C5_MSAEn)) || (env->msa_on)) {
             env->hflags |= MIPS_HFLAG_MSA;
         }
     }
-- 
2.34.1