--- /dev/null
+/* virt-what-ia64-xen-rdtsc-test
+ * Copyright (C) 2011 Red Hat Inc.
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
+ */
+
+#ifndef __ia64__
+#error "error in Makefile - this program should only be compiled for ia64 host"
+#endif
+
+/* This program is ugly, but possibly the only way to detect
+ * virtualized Xen HVM guests on IA64.
+ */
+
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+
+static inline unsigned long
+rdtsc (void)
+{
+ unsigned long res;
+ asm volatile ("mov %0=ar.itc" : "=r"(res));
+ return res;
+}
+
+int
+main ()
+{
+ unsigned long old, new;
+ int virt;
+ int i;
+
+ virt = 1;
+
+ for (i = 16; i--; ) {
+ old = rdtsc (); new = rdtsc ();
+ /*printf("%ld\n", new - old);*/
+ if (new - old < 30) {
+ virt = 0;
+ break;
+ }
+ }
+
+ exit (virt);
+}