1 files changed, 9 insertions, 0 deletions
diff --git a/tcg/tcg.h b/tcg/tcg.h
index f946452049..4c7f258220 100644
--- a/tcg/tcg.h
+++ b/tcg/tcg.h
@@ -80,6 +80,15 @@ typedef uint64_t tcg_target_ulong;
 #error unsupported
 #endif
 
+/* Oversized TCG guests make things like MTTCG hard
+ * as we can't use atomics for cputlb updates.
+ */
+#if TARGET_LONG_BITS > TCG_TARGET_REG_BITS
+#define TCG_OVERSIZED_GUEST 1
+#else
+#define TCG_OVERSIZED_GUEST 0
+#endif
+
 #if TCG_TARGET_NB_REGS <= 32
 typedef uint32_t TCGRegSet;
 #elif TCG_TARGET_NB_REGS <= 64