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, 39 insertions, 0 deletions

diff --git a/plugins/api.c b/plugins/api.c
index b04c5e1928..5a0a7f8c71 100644
--- a/plugins/api.c
+++ b/plugins/api.c
@@ -102,6 +102,25 @@ void qemu_plugin_register_vcpu_tb_exec_cb(struct qemu_plugin_tb *tb,
     }
 }
 
+void qemu_plugin_register_vcpu_tb_exec_cond_cb(struct qemu_plugin_tb *tb,
+                                               qemu_plugin_vcpu_udata_cb_t cb,
+                                               enum qemu_plugin_cb_flags flags,
+                                               enum qemu_plugin_cond cond,
+                                               qemu_plugin_u64 entry,
+                                               uint64_t imm,
+                                               void *udata)
+{
+    if (cond == QEMU_PLUGIN_COND_NEVER || tb_is_mem_only()) {
+        return;
+    }
+    if (cond == QEMU_PLUGIN_COND_ALWAYS) {
+        qemu_plugin_register_vcpu_tb_exec_cb(tb, cb, flags, udata);
+        return;
+    }
+    plugin_register_dyn_cond_cb__udata(&tb->cbs, cb, flags,
+                                       cond, entry, imm, udata);
+}
+
 void qemu_plugin_register_vcpu_tb_exec_inline_per_vcpu(
     struct qemu_plugin_tb *tb,
     enum qemu_plugin_op op,
@@ -123,6 +142,26 @@ void qemu_plugin_register_vcpu_insn_exec_cb(struct qemu_plugin_insn *insn,
     }
 }
 
+void qemu_plugin_register_vcpu_insn_exec_cond_cb(
+    struct qemu_plugin_insn *insn,
+    qemu_plugin_vcpu_udata_cb_t cb,
+    enum qemu_plugin_cb_flags flags,
+    enum qemu_plugin_cond cond,
+    qemu_plugin_u64 entry,
+    uint64_t imm,
+    void *udata)
+{
+    if (cond == QEMU_PLUGIN_COND_NEVER || tb_is_mem_only()) {
+        return;
+    }
+    if (cond == QEMU_PLUGIN_COND_ALWAYS) {
+        qemu_plugin_register_vcpu_insn_exec_cb(insn, cb, flags, udata);
+        return;
+    }
+    plugin_register_dyn_cond_cb__udata(&insn->insn_cbs, cb, flags,
+                                       cond, entry, imm, udata);
+}
+
 void qemu_plugin_register_vcpu_insn_exec_inline_per_vcpu(
     struct qemu_plugin_insn *insn,
     enum qemu_plugin_op op,