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

Commit Message

Emilio Cota Dec. 9, 2018, 7:37 p.m. UTC

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 <[e-mail]>
Signed-off-by: Emilio G. Cota <[e-mail]>
---
 accel/tcg/translate-all.c | 6 ++++++
 1 file changed, 6 insertions(+)

Patch

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)