exec: On AS changes, only flush affected CPU TLBs

Reviewed-by: Peter Maydell <peter.maydell@linaro.org>
Signed-off-by: Edgar E. Iglesias <edgar.iglesias@xilinx.com>

exec.c

diff --git a/exec.c b/exec.c
index cd931c1..5e2d121 100644
--- a/exec.c
+++ b/exec.c
@@ -1828,6 +1828,11 @@
     CPU_FOREACH(cpu) {
         CPUArchState *env = cpu->env_ptr;
 
+        /* FIXME: Disentangle the cpu.h circular files deps so we can
+           directly get the right CPU from listener.  */
+        if (cpu->tcg_as_listener != listener) {
+            continue;
+        }
         tlb_flush(env, 1);
     }
 }