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-rw-r--r--include/qemu/osdep.h9
1 files changed, 9 insertions, 0 deletions
diff --git a/include/qemu/osdep.h b/include/qemu/osdep.h
index 994bfa023a..693769403f 100644
--- a/include/qemu/osdep.h
+++ b/include/qemu/osdep.h
@@ -327,6 +327,15 @@ static inline void qemu_timersub(const struct timeval *val1,
 
 void qemu_set_cloexec(int fd);
 
+/* Starting on QEMU 2.5, qemu_hw_version() returns "2.5+" by default
+ * instead of QEMU_VERSION, so setting hw_version on MachineClass
+ * is no longer mandatory.
+ *
+ * Do NOT change this string, or it will break compatibility on all
+ * machine classes that don't set hw_version.
+ */
+#define QEMU_HW_VERSION "2.5+"
+
 /* QEMU "hardware version" setting. Used to replace code that exposed
  * QEMU_VERSION to guests in the past and need to keep compatibility.
  * Do not use qemu_hw_version() in new code.