Index: user/kvmctl.c
===================================================================
--- user/kvmctl.c	(revision 4622)
+++ user/kvmctl.c	(working copy)
@@ -421,6 +421,16 @@
 	int i;
 	void *p = (void *)run + run->io.data_offset;
 
+	do {
+	    static int n;
+
+	    if (n++ % 100000 != 0)
+		break;
+	    printf("handle_io: port %x dir %d size %d count %ld offset %lx\n",
+		   run->io.port, run->io.direction, run->io.size,
+		   (long)run->io.count, (long)run->io.data_offset);
+	} while (0);
+
 	for (i = 0; i < run->io.count; ++i) {
 		switch (run->io.direction) {
 		case KVM_EXIT_IO_IN: