[v18,4/9] tests: add a unit test for the vmgenid device.

diff --git a/tests/Makefile b/tests/Makefile
index b7352f1..8cccf6e 100644
--- a/tests/Makefile
+++ b/tests/Makefile
@@ -206,6 +206,7 @@  check-qtest-i386-y += tests/usb-hcd-xhci-test$(EXESUF)
 gcov-files-i386-y += hw/usb/hcd-xhci.c
 check-qtest-i386-y += tests/pc-cpu-test$(EXESUF)
 check-qtest-i386-y += tests/q35-test$(EXESUF)
+check-qtest-i386-y += tests/vmgenid-test$(EXESUF)
 gcov-files-i386-y += hw/pci-host/q35.c
 check-qtest-i386-$(CONFIG_VHOST_NET_TEST_i386) += tests/vhost-user-test$(EXESUF)
 ifeq ($(CONFIG_VHOST_NET_TEST_i386),)
@@ -565,6 +566,7 @@  tests/test-write-threshold$(EXESUF): tests/test-write-threshold.o $(test-block-o
 tests/test-netfilter$(EXESUF): tests/test-netfilter.o $(qtest-obj-y)
 tests/ivshmem-test$(EXESUF): tests/ivshmem-test.o contrib/ivshmem-server/ivshmem-server.o $(libqos-pc-obj-y)
 tests/vhost-user-bridge$(EXESUF): tests/vhost-user-bridge.o
+tests/vmgenid-test$(EXESUF): tests/vmgenid-test.o
 
 ifeq ($(CONFIG_POSIX),y)
 LIBS += -lutil
diff --git a/tests/vmgenid-test.c b/tests/vmgenid-test.c
new file mode 100644
index 0000000..9388180
--- /dev/null
+++ b/tests/vmgenid-test.c
@@ -0,0 +1,93 @@ 
+/*
+ * QTest testcase for VM Generation ID
+ *
+ * Copyright (c) 2016 Red Hat, Inc.
+ *
+ * This work is licensed under the terms of the GNU GPL, version 2 or later.
+ * See the COPYING file in the top-level directory.
+ */
+
+#include <glib.h>
+#include <string.h>
+#include <unistd.h>
+#include "libqtest.h"
+
+/* Wait at most 1 minute */
+#define TEST_DELAY (1 * G_USEC_PER_SEC / 10)
+#define TEST_CYCLES MAX((60 * G_USEC_PER_SEC / TEST_DELAY), 1)
+
+#define VGID_GUID "324e6eaf-d1d1-4bf6-bf41-b9bb6c91fb87"
+
+static void vmgenid_check_guid(const uint8_t *expected)
+{
+    uint8_t guid[16];
+    int i;
+    uint32_t addr = 0;
+    QDict *response;
+
+    for (i = 0; i < TEST_CYCLES; ++i) {
+        response = qmp("{ 'execute': 'qom-get', 'arguments': { "
+                       "'path': '/machine/peripheral/testvgid', "
+                       "'property': 'vmgid-addr' } }");
+        if (qdict_haskey(response, "return")) {
+            addr = qdict_get_int(response, "return");
+        }
+        QDECREF(response);
+        if (addr) {
+            break;
+        }
+        g_usleep(TEST_DELAY);
+    }
+    g_assert(addr);
+
+    /* Skip the ACPI ADDR method and read the GUID directly from memory */
+    for (i = 0; i < 16; i++) {
+        guid[i] = readb(addr + i);
+    }
+
+    g_assert(memcmp(guid, expected, sizeof(guid)) == 0);
+}
+
+static void vmgenid_test(void)
+{
+    static const uint8_t expected[16] = {
+        0x32, 0x4e, 0x6e, 0xaf, 0xd1, 0xd1, 0x4b, 0xf6,
+        0xbf, 0x41, 0xb9, 0xbb, 0x6c, 0x91, 0xfb, 0x87
+    };
+    vmgenid_check_guid(expected);
+}
+
+static void vmgenid_set_guid_test(void)
+{
+    QDict *response;
+    static const uint8_t expected[16] = {
+        0x12, 0x4e, 0x6e, 0xaf, 0xd1, 0xd1, 0x4b, 0xf6,
+        0xbf, 0x41, 0xb9, 0xbb, 0x6c, 0x91, 0xfb, 0x87
+    };
+
+    response = qmp("{ 'execute': 'qom-set', 'arguments': { "
+                   "'path': '/machine/peripheral/testvgid', "
+                   "'property': 'guid', 'value': '"
+                   "124e6eaf-d1d1-4bf6-bf41-b9bb6c91fb87' } }");
+    g_assert(qdict_haskey(response, "return"));
+    QDECREF(response);
+
+    vmgenid_check_guid(expected);
+}
+
+int main(int argc, char **argv)
+{
+    int ret;
+
+    g_test_init(&argc, &argv, NULL);
+
+    qtest_start("-machine accel=tcg -device vmgenid,id=testvgid,"
+                "guid=" VGID_GUID);
+    qtest_add_func("/vmgenid/vmgenid", vmgenid_test);
+    qtest_add_func("/vmgenid/vmgenid/set-guid", vmgenid_set_guid_test);
+    ret = g_test_run();
+
+    qtest_end();
+
+    return ret;
+}