[PATCH 6/6] target/i386: Use env_archcpu() in simulate_[rdmsr/wrmsr]()

[Philippe Mathieu-Daudé]

When CPUArchState* is available (here CPUX86State*), we can
use the fast env_archcpu() macro to get ArchCPU* (here X86CPU*).
The QOM cast X86_CPU() macro will be slower when building with
--enable-qom-cast-debug.

Pass CPUX86State* as argument to simulate_rdmsr / simulate_wrmsr
instead of a CPUState* to avoid an extra cast.

simulate_rdmsr/simulate_rdmsr(CPUX86State

Signed-off-by: Philippe Mathieu-Daudé <philmd@linaro.org>
---
RFC: Not even build-tested.
---
 target/i386/hvf/x86_emu.h |  4 ++--
 target/i386/hvf/hvf.c     |  4 ++--
 target/i386/hvf/x86_emu.c | 21 ++++++++++-----------
 3 files changed, 14 insertions(+), 15 deletions(-)

diff --git a/target/i386/hvf/x86_emu.h b/target/i386/hvf/x86_emu.h
index 640da90b30..4b846ba80e 100644
--- a/target/i386/hvf/x86_emu.h
+++ b/target/i386/hvf/x86_emu.h
@@ -29,8 +29,8 @@ bool exec_instruction(CPUX86State *env, struct x86_decode 
*ins);
 void load_regs(struct CPUState *cpu);
 void store_regs(struct CPUState *cpu);
 
-void simulate_rdmsr(struct CPUState *cpu);
-void simulate_wrmsr(struct CPUState *cpu);
+void simulate_rdmsr(CPUX86State *env);
+void simulate_wrmsr(CPUX86State *env);
 
 target_ulong read_reg(CPUX86State *env, int reg, int size);
 void write_reg(CPUX86State *env, int reg, target_ulong val, int size);
diff --git a/target/i386/hvf/hvf.c b/target/i386/hvf/hvf.c
index cb2cd0b02f..20b9ca3ef5 100644
--- a/target/i386/hvf/hvf.c
+++ b/target/i386/hvf/hvf.c
@@ -591,9 +591,9 @@ int hvf_vcpu_exec(CPUState *cpu)
         {
             load_regs(cpu);
             if (exit_reason == EXIT_REASON_RDMSR) {
-                simulate_rdmsr(cpu);
+                simulate_rdmsr(env);
             } else {
-                simulate_wrmsr(cpu);
+                simulate_wrmsr(env);
             }
             env->eip += ins_len;
             store_regs(cpu);
diff --git a/target/i386/hvf/x86_emu.c b/target/i386/hvf/x86_emu.c
index af1f205ecf..b1f8a685d1 100644
--- a/target/i386/hvf/x86_emu.c
+++ b/target/i386/hvf/x86_emu.c
@@ -663,11 +663,10 @@ static void exec_lods(CPUX86State *env, struct x86_decode 
*decode)
     env->eip += decode->len;
 }
 
-void simulate_rdmsr(struct CPUState *cpu)
+void simulate_rdmsr(CPUX86State *env)
 {
-    X86CPU *x86_cpu = X86_CPU(cpu);
-    CPUX86State *env = &x86_cpu->env;
-    CPUState *cs = env_cpu(env);
+    X86CPU *x86_cpu = env_archcpu(env);
+    CPUState *cpu = env_cpu(env);
     uint32_t msr = ECX(env);
     uint64_t val = 0;
 
@@ -746,8 +745,8 @@ void simulate_rdmsr(struct CPUState *cpu)
         val = env->mtrr_deftype;
         break;
     case MSR_CORE_THREAD_COUNT:
-        val = cs->nr_threads * cs->nr_cores; /* thread count, bits 15..0 */
-        val |= ((uint32_t)cs->nr_cores << 16); /* core count, bits 31..16 */
+        val = cpu->nr_threads * cpu->nr_cores;  /* thread count, bits 15..0 */
+        val |= ((uint32_t)cpu->nr_cores << 16); /* core count, bits 31..16 */
         break;
     default:
         /* fprintf(stderr, "%s: unknown msr 0x%x\n", __func__, msr); */
@@ -761,14 +760,14 @@ void simulate_rdmsr(struct CPUState *cpu)
 
 static void exec_rdmsr(CPUX86State *env, struct x86_decode *decode)
 {
-    simulate_rdmsr(env_cpu(env));
+    simulate_rdmsr(env);
     env->eip += decode->len;
 }
 
-void simulate_wrmsr(struct CPUState *cpu)
+void simulate_wrmsr(CPUX86State *env)
 {
-    X86CPU *x86_cpu = X86_CPU(cpu);
-    CPUX86State *env = &x86_cpu->env;
+    X86CPU *x86_cpu = env_archcpu(env);
+    CPUState *cpu = env_cpu(env);
     uint32_t msr = ECX(env);
     uint64_t data = ((uint64_t)EDX(env) << 32) | EAX(env);
 
@@ -856,7 +855,7 @@ void simulate_wrmsr(struct CPUState *cpu)
 
 static void exec_wrmsr(CPUX86State *env, struct x86_decode *decode)
 {
-    simulate_wrmsr(env_cpu(env));
+    simulate_wrmsr(env);
     env->eip += decode->len;
 }
 
-- 
2.41.0