bnc#880438 - systemd-detect-virt doesn't work on System z

--- systemd-210/src/shared/virt.c
+++ systemd-210/src/shared/virt.c	2014-06-17 08:03:30.152489353 +0000
@@ -196,6 +196,29 @@
         } else
                 return r;
 
+#if defined(__s390x__)
+        /* First layer virtualization (PR/SM) is always present on s390x */
+        _id = "PR/SM";
+        r = 1;
+
+        /* Check for second layer virtualization */
+        _cleanup_fclose_ FILE *f = NULL;
+        char line[LINE_MAX];
+        f = fopen("/proc/sysinfo", "re");
+        if (f) {
+                FOREACH_LINE(line, f, return -errno) {
+                        if (startswith(line, "VM00 Control Program:")) {
+                                if (strstr(line,"z/VM"))
+                                        _id = "z/VM";
+
+                                break;
+                        }
+                }
+        }
+
+        goto finish;
+#endif
+
         /* this will set _id to "other" and return 0 for unknown hypervisors */
         r = detect_vm_cpuid(&_id);
         if (r != 0)