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tcg plugins: expose an API version concept

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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>
This commit is contained in:
Alex Bennée 2019-11-04 13:18:36 +00:00
parent 05273a43af
commit 3fb356cc86
10 changed files with 56 additions and 0 deletions
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19
include/qemu/qemu-plugin.h
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@ -38,9 +38,28 @@
typedef uint64_t qemu_plugin_id_t;
/*
* Versioning plugins:
*
* The plugin API will pass a minimum and current API version that
* QEMU currently supports. The minimum API will be incremented if an
* API needs to be deprecated.
*
* The plugins export the API they were built against by exposing the
* symbol qemu_plugin_version which can be checked.
*/
extern QEMU_PLUGIN_EXPORT int qemu_plugin_version;
#define QEMU_PLUGIN_VERSION 0
typedef struct {
/* string describing architecture */
const char *target_name;
struct {
int min;
int cur;
} version;
/* is this a full system emulation? */
bool system_emulation;
union {