--- test.c	2018-05-04 13:47:26.000000000 +0200
+++ test-io.c	2020-03-04 10:26:06.812886694 +0100
@@ -159,6 +159,20 @@
 	printf("EDX: %llx\n", regs.rdx); 
 
 	return 1;
+      case KVM_EXIT_IO:
+        if ((r->io.direction == KVM_EXIT_IO_OUT) && (r->io.port == 0xe9)) {
+          char *p = (char *)r;
+
+          if (r->io.size != 1) {
+          fprintf(stderr, "Bad I/O of size %d!!!\n", r->io.size);
+          } else {
+            printf("%c", *(p + r->io.data_offset));
+            fflush(stdout);
+          }
+        } else {
+          fprintf(stderr, "Bad I/O to port %d!!!\n", r->io.port);
+        }
+        break;
       default:
         fprintf(stderr,	"VM Exit reason: %d, expected KVM_EXIT_HLT (%d)\n",
                         r->exit_reason, KVM_EXIT_HLT);