tcg plugins: expose an API version concept

This is a very simple versioning API which allows the plugin
infrastructure to check the API a plugin was built against. We also
expose a min/cur API version to the plugin via the info block in case
it wants to avoid using old deprecated APIs in the future.

Signed-off-by: Alex Bennée <alex.bennee@linaro.org>
Reviewed-by: Philippe Mathieu-Daudé <philmd@redhat.com>
Reviewed-by: Peter Maydell <peter.maydell@linaro.org>
Reviewed-by: Robert Foley <robert.foley@linaro.org>

7 files changed, 14 insertions, 0 deletions

diff --git a/tests/plugin/bb.c b/tests/plugin/bb.c
index 45e1de5bd6..f30bea08dc 100644
--- a/tests/plugin/bb.c
+++ b/tests/plugin/bb.c
@@ -14,6 +14,8 @@
 
 #include <qemu-plugin.h>
 
+QEMU_PLUGIN_EXPORT int qemu_plugin_version = QEMU_PLUGIN_VERSION;
+
 static uint64_t bb_count;
 static uint64_t insn_count;
 static bool do_inline;
diff --git a/tests/plugin/empty.c b/tests/plugin/empty.c
index 3f60f69027..8fa6bacd93 100644
--- a/tests/plugin/empty.c
+++ b/tests/plugin/empty.c
@@ -13,6 +13,8 @@
 
 #include <qemu-plugin.h>
 
+QEMU_PLUGIN_EXPORT int qemu_plugin_version = QEMU_PLUGIN_VERSION;
+
 /*
  * Empty TB translation callback.
  * This allows us to measure the overhead of injecting and then
diff --git a/tests/plugin/hotblocks.c b/tests/plugin/hotblocks.c
index 1bd183849a..3942a2ca54 100644
--- a/tests/plugin/hotblocks.c
+++ b/tests/plugin/hotblocks.c
@@ -15,6 +15,8 @@
 
 #include <qemu-plugin.h>
 
+QEMU_PLUGIN_EXPORT int qemu_plugin_version = QEMU_PLUGIN_VERSION;
+
 static bool do_inline;
 
 /* Plugins need to take care of their own locking */
diff --git a/tests/plugin/hotpages.c b/tests/plugin/hotpages.c
index 77df07a3cc..ecd6c18732 100644
--- a/tests/plugin/hotpages.c
+++ b/tests/plugin/hotpages.c
@@ -18,6 +18,8 @@
 
 #include <qemu-plugin.h>
 
+QEMU_PLUGIN_EXPORT int qemu_plugin_version = QEMU_PLUGIN_VERSION;
+
 #define ARRAY_SIZE(x) (sizeof(x) / sizeof((x)[0]))
 
 static uint64_t page_size = 4096;
diff --git a/tests/plugin/howvec.c b/tests/plugin/howvec.c
index 58fa675e34..4ca555e123 100644
--- a/tests/plugin/howvec.c
+++ b/tests/plugin/howvec.c
@@ -20,6 +20,8 @@
 
 #include <qemu-plugin.h>
 
+QEMU_PLUGIN_EXPORT int qemu_plugin_version = QEMU_PLUGIN_VERSION;
+
 #define ARRAY_SIZE(x) (sizeof(x) / sizeof((x)[0]))
 
 typedef enum {
diff --git a/tests/plugin/insn.c b/tests/plugin/insn.c
index e5fd07fb64..0a8f5a0000 100644
--- a/tests/plugin/insn.c
+++ b/tests/plugin/insn.c
@@ -14,6 +14,8 @@
 
 #include <qemu-plugin.h>
 
+QEMU_PLUGIN_EXPORT int qemu_plugin_version = QEMU_PLUGIN_VERSION;
+
 static uint64_t insn_count;
 static bool do_inline;
 
diff --git a/tests/plugin/mem.c b/tests/plugin/mem.c
index d967388989..878abf09d1 100644
--- a/tests/plugin/mem.c
+++ b/tests/plugin/mem.c
@@ -14,6 +14,8 @@
 
 #include <qemu-plugin.h>
 
+QEMU_PLUGIN_EXPORT int qemu_plugin_version = QEMU_PLUGIN_VERSION;
+
 static uint64_t mem_count;
 static uint64_t io_count;
 static bool do_inline;