[Qemu-devel] [PULL 17/18] target-i386: Generate fences for x86

[Richard Henderson <rth@twiddle.net>]

From: Pranith Kumar <bobby.prani@gmail.com>

Signed-off-by: Pranith Kumar <bobby.prani@gmail.com>
Message-Id: <20160714202026.9727-15-bobby.prani@gmail.com>
Signed-off-by: Richard Henderson <rth@twiddle.net>
---
 target-i386/translate.c | 8 ++++++++
 1 file changed, 8 insertions(+)

diff --git a/target-i386/translate.c b/target-i386/translate.c
index fa2ac48..9447557 100644
--- a/target-i386/translate.c
+++ b/target-i386/translate.c
@@ -8012,13 +8012,21 @@ static target_ulong disas_insn(CPUX86State *env, DisasContext *s,
                 || (prefixes & PREFIX_LOCK)) {
                 goto illegal_op;
             }
+            tcg_gen_mb(TCG_MO_ST_ST | TCG_BAR_SC);
             break;
         case 0xe8 ... 0xef: /* lfence */
+            if (!(s->cpuid_features & CPUID_SSE)
+                || (prefixes & PREFIX_LOCK)) {
+                goto illegal_op;
+            }
+            tcg_gen_mb(TCG_MO_LD_LD | TCG_BAR_SC);
+            break;
         case 0xf0 ... 0xf7: /* mfence */
             if (!(s->cpuid_features & CPUID_SSE2)
                 || (prefixes & PREFIX_LOCK)) {
                 goto illegal_op;
             }
+            tcg_gen_mb(TCG_MO_ALL | TCG_BAR_SC);
             break;
 
         default:
-- 
2.7.4