target/s390x: define TCG_GUEST_DEFAULT_MO for MTTCG

MTTCG should be enabled by default whenever the memory model allows
it. s390x was missing its definition of TCG_GUEST_DEFAULT_MO meaning
the user had to manually specify  --accel tcg,thread=multi.

Signed-off-by: Alex Bennée <alex.bennee@linaro.org>
Cc: David Hildenbrand <david@redhat.com>
Message-Id: <20190118171848.27332-1-alex.bennee@linaro.org>
Reviewed-by: David Hildenbrand <david@redhat.com>
Reviewed-by: Richard Henderson <richard.henderson@linaro.org>
Signed-off-by: Cornelia Huck <cohuck@redhat.com>

diff --git a/target/s390x/cpu.h b/target/s390x/cpu.h
index 8c2320e..47d2c2e 100644 (file)
--- a/target/s390x/cpu.h
+++ b/target/s390x/cpu.h
@@ -35,6 +35,10 @@
 #define CPUArchState struct CPUS390XState
 
 #include "exec/cpu-defs.h"
+
+/* The z/Architecture has a strong memory model with some store-after-load re-ordering */
+#define TCG_GUEST_DEFAULT_MO      (TCG_MO_ALL & ~TCG_MO_ST_LD)
+
 #define TARGET_PAGE_BITS 12
 
 #define TARGET_PHYS_ADDR_SPACE_BITS 64