[Qemu-devel] [RFC v2 16/38] translate-all: notify plugin code of tb_flush

[Emilio G. Cota]

Plugins might allocate per-TB data that then they get passed each
time a TB is executed (via the *userdata pointer).

Notify plugin code every time a code cache flush occurs, so
that plugins can then reclaim the memory of the per-TB data.

Reviewed-by: Alex Bennée <address@hidden>
Signed-off-by: Emilio G. Cota <address@hidden>
---
 accel/tcg/translate-all.c | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/accel/tcg/translate-all.c b/accel/tcg/translate-all.c
index 62d5e13185..aaa8193ceb 100644
--- a/accel/tcg/translate-all.c
+++ b/accel/tcg/translate-all.c
@@ -1232,6 +1232,8 @@ static gboolean tb_host_size_iter(gpointer key, gpointer 
value, gpointer data)
 /* flush all the translation blocks */
 static void do_tb_flush(CPUState *cpu, run_on_cpu_data tb_flush_count)
 {
+    bool did_flush = false;
+
     mmap_lock();
     /* If it is already been done on request of another CPU,
      * just retry.
@@ -1239,6 +1241,7 @@ static void do_tb_flush(CPUState *cpu, run_on_cpu_data 
tb_flush_count)
     if (tb_ctx.tb_flush_count != tb_flush_count.host_int) {
         goto done;
     }
+    did_flush = true;
 
     if (DEBUG_TB_FLUSH_GATE) {
         size_t nb_tbs = tcg_nb_tbs();
@@ -1263,6 +1266,9 @@ static void do_tb_flush(CPUState *cpu, run_on_cpu_data 
tb_flush_count)
 
 done:
     mmap_unlock();
+    if (did_flush) {
+        qemu_plugin_flush_cb();
+    }
 }
 
 void tb_flush(CPUState *cpu)
-- 
2.17.1