accel/tcg: split CpusAccel into three TCG variants

split up the CpusAccel tcg_cpus into three TCG variants:

tcg_cpus_rr (single threaded, round robin cpus)
tcg_cpus_icount (same as rr, but with instruction counting enabled)
tcg_cpus_mttcg (multi-threaded cpus)

Suggested-by: Richard Henderson <richard.henderson@linaro.org>
Signed-off-by: Claudio Fontana <cfontana@suse.de>
Reviewed-by: Richard Henderson <richard.henderson@linaro.org>
Reviewed-by: Philippe Mathieu-Daudé <f4bug@amsat.org>
Message-Id: <20201015143217.29337-2-cfontana@suse.de>
Signed-off-by: Richard Henderson <richard.henderson@linaro.org>

1 files changed, 7 insertions, 1 deletions

diff --git a/accel/tcg/tcg-all.c b/accel/tcg/tcg-all.c
index fa1208158f..e42a028043 100644
--- a/accel/tcg/tcg-all.c
+++ b/accel/tcg/tcg-all.c
@@ -104,8 +104,14 @@ static int tcg_init(MachineState *ms)
 
     tcg_exec_init(s->tb_size * 1024 * 1024);
     mttcg_enabled = s->mttcg_enabled;
-    cpus_register_accel(&tcg_cpus);
 
+    if (mttcg_enabled) {
+        cpus_register_accel(&tcg_cpus_mttcg);
+    } else if (icount_enabled()) {
+        cpus_register_accel(&tcg_cpus_icount);
+    } else {
+        cpus_register_accel(&tcg_cpus_rr);
+    }
     return 0;
 }