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[PATCH 6/8] plugins: implement QPP import function
From: |
Andrew Fasano |
Subject: |
[PATCH 6/8] plugins: implement QPP import function |
Date: |
Tue, 13 Dec 2022 16:37:55 -0500 |
From: Elysia Witham <elysia.witham@ll.mit.edu>
Plugins can export functions or import functions from other
plugins using their name and the function name. This is also
described in <qemu-plugin.h>.
Signed-off-by: Elysia Witham <elysia.witham@ll.mit.edu>
Signed-off-by: Andrew Fasano <fasano@mit.edu>
---
include/qemu/qemu-plugin.h | 10 ++++++++++
plugins/api.c | 21 +++++++++++++++++++++
plugins/qemu-plugins.symbols | 1 +
3 files changed, 32 insertions(+)
diff --git a/include/qemu/qemu-plugin.h b/include/qemu/qemu-plugin.h
index 4221545015..a0516e9a0e 100644
--- a/include/qemu/qemu-plugin.h
+++ b/include/qemu/qemu-plugin.h
@@ -354,6 +354,16 @@ size_t qemu_plugin_tb_n_insns(const struct qemu_plugin_tb
*tb);
*/
uint64_t qemu_plugin_tb_vaddr(const struct qemu_plugin_tb *tb);
+/**
+ * qemu_plugin_import_function() - return pointer to a function in another
+ * plugin
+ * @plugin: plugin name
+ * @function: function name
+ *
+ * Returns: NULL on failure, function pointer on success
+ */
+gpointer qemu_plugin_import_function(const char *plugin, const char *function);
+
/**
* qemu_plugin_create_callback() - create a new cb with given name
* @id: unique plugin id
diff --git a/plugins/api.c b/plugins/api.c
index 1f7ea718dc..a998df6942 100644
--- a/plugins/api.c
+++ b/plugins/api.c
@@ -400,6 +400,27 @@ bool qemu_plugin_bool_parse(const char *name, const char
*value, bool *ret)
return name && value && qapi_bool_parse(name, value, ret, NULL);
}
+/*
+ * QPP: inter-plugin function resolution and callbacks
+ */
+
+gpointer qemu_plugin_import_function(const char *target_plugin,
+ const char *function) {
+ gpointer function_pointer = NULL;
+ struct qemu_plugin_ctx *ctx = plugin_name_to_ctx_locked(target_plugin);
+ if (ctx == NULL) {
+ error_report("Unable to load plugin %s by name", target_plugin);
+ } else if (g_module_symbol(ctx->handle, function,
+ (gpointer *)&function_pointer)) {
+ return function_pointer;
+ } else {
+ error_report("function: %s not found in plugin: %s", function,
+ target_plugin);
+ }
+ abort();
+ return NULL;
+}
+
bool qemu_plugin_create_callback(qemu_plugin_id_t id, const char *cb_name)
{
struct qemu_plugin_ctx *ctx = plugin_id_to_ctx_locked(id);
diff --git a/plugins/qemu-plugins.symbols b/plugins/qemu-plugins.symbols
index b7013980cf..70a518839d 100644
--- a/plugins/qemu-plugins.symbols
+++ b/plugins/qemu-plugins.symbols
@@ -3,6 +3,7 @@
qemu_plugin_end_code;
qemu_plugin_entry_code;
qemu_plugin_get_hwaddr;
+ qemu_plugin_import_function;
qemu_plugin_create_callback;
qemu_plugin_run_callback;
qemu_plugin_reg_callback;
--
2.34.1
- [PATCH 0/8] Inter-plugin interactions with QPP, Andrew Fasano, 2022/12/13
- [PATCH 1/8] docs/devel: describe QPP API, Andrew Fasano, 2022/12/13
- [PATCH 2/8] plugins: version 2, require unique plugin names, Andrew Fasano, 2022/12/13
- [PATCH 3/8] plugins: add id_to_plugin_name, Andrew Fasano, 2022/12/13
- [PATCH 6/8] plugins: implement QPP import function,
Andrew Fasano <=
- [PATCH 7/8] include/qemu: added macro for QPP import function, Andrew Fasano, 2022/12/13
- [PATCH 8/8] tests: build and run QPP tests, Andrew Fasano, 2022/12/13
- [PATCH 4/8] plugins: add core API functions for QPP callbacks, Andrew Fasano, 2022/12/13
- [PATCH 5/8] plugins: implement QPP callbacks, Andrew Fasano, 2022/12/13