plugins: conditional callbacks

Extend plugins API to support callback called with a given criteria
(evaluated inline).

Added functions:
- qemu_plugin_register_vcpu_tb_exec_cond_cb
- qemu_plugin_register_vcpu_insn_exec_cond_cb

They expect as parameter a condition, a qemu_plugin_u64_t (op1) and an
immediate (op2). Callback is called if op1 |cond| op2 is true.

Reviewed-by: Richard Henderson <richard.henderson@linaro.org>
Signed-off-by: Pierrick Bouvier <pierrick.bouvier@linaro.org>
Message-Id: <20240502211522.346467-6-pierrick.bouvier@linaro.org>
Reviewed-by: Michael S. Tsirkin <mst@redhat.com>
[AJB: fix re-base conflict with tb_is_mem_only()]
Signed-off-by: Alex Bennée <alex.bennee@linaro.org>
Message-Id: <20240514174253.694591-8-alex.bennee@linaro.org>

1 files changed, 8 insertions, 0 deletions

diff --git a/include/qemu/plugin.h b/include/qemu/plugin.h
index aaa4b830fb..2b126e1884 100644
--- a/include/qemu/plugin.h
+++ b/include/qemu/plugin.h
@@ -68,6 +68,7 @@ union qemu_plugin_cb_sig {
 
 enum plugin_dyn_cb_type {
     PLUGIN_CB_REGULAR,
+    PLUGIN_CB_COND,
     PLUGIN_CB_MEM_REGULAR,
     PLUGIN_CB_INLINE_ADD_U64,
     PLUGIN_CB_INLINE_STORE_U64,
@@ -90,6 +91,13 @@ struct qemu_plugin_dyn_cb {
             TCGHelperInfo *info;
         } regular;
         struct {
+            union qemu_plugin_cb_sig f;
+            TCGHelperInfo *info;
+            qemu_plugin_u64 entry;
+            enum qemu_plugin_cond cond;
+            uint64_t imm;
+        } cond;
+        struct {
             qemu_plugin_u64 entry;
             enum qemu_plugin_op op;
             uint64_t imm;