[v6,14/22] exec: Add function to synchronously flush TB on a stopped vCPU

Commit Message

Lluís Vilanova Sept. 13, 2017, 10:50 a.m. UTC

Signed-off-by: Lluís Vilanova <[e-mail]>
---
 accel/stubs/tcg-stub.c    |    3 +++
 accel/tcg/translate-all.c |    7 +++++++
 include/exec/exec-all.h   |    1 +
 3 files changed, 11 insertions(+)

Patch

diff --git a/accel/stubs/tcg-stub.c b/accel/stubs/tcg-stub.c
index 5dd480b1a2..5226c4a8a4 100644
--- a/accel/stubs/tcg-stub.c
+++ b/accel/stubs/tcg-stub.c
@@ -20,3 +20,6 @@ 
 void tb_flush(CPUState *cpu)
 {
 }
+void tb_flush_sync(CPUState *cpu)
+{
+}
diff --git a/accel/tcg/translate-all.c b/accel/tcg/translate-all.c
index 2d1ed06065..a334ac4ccb 100644
--- a/accel/tcg/translate-all.c
+++ b/accel/tcg/translate-all.c
@@ -929,6 +929,13 @@  done:
     tb_unlock();
 }
 
+void tb_flush_sync(CPUState *cpu)
+{
+    unsigned tb_flush_count = atomic_mb_read(&tcg_ctx.tb_ctx.tb_flush_count);
+    assert(cpu == current_cpu);
+    do_tb_flush(cpu, RUN_ON_CPU_HOST_INT(tb_flush_count));
+}
+
 void tb_flush(CPUState *cpu)
 {
     if (tcg_enabled()) {
diff --git a/include/exec/exec-all.h b/include/exec/exec-all.h
index 673fc066d0..3f38186a5e 100644
--- a/include/exec/exec-all.h
+++ b/include/exec/exec-all.h
@@ -358,6 +358,7 @@  struct TranslationBlock {
 
 void tb_free(TranslationBlock *tb);
 void tb_flush(CPUState *cpu);
+void tb_flush_sync(CPUState *cpu);
 void tb_phys_invalidate(TranslationBlock *tb, tb_page_addr_t page_addr);
 TranslationBlock *tb_htable_lookup(CPUState *cpu, target_ulong pc,
                                    target_ulong cs_base, uint32_t flags);