tests: qemuxml2argv: Add infrastructure for testing with real qemuCaps

Allow testing of XML->argv conversion with using a real capability map
as used in the qemucapabilitiestest. This allows specifying the required
qemu version with the test rather than having to enumerate all the
required capabilities or allows to use the newest capabilities present.
Signed-off-by: NPeter Krempa <pkrempa@redhat.com>

tests/qemuxml2argvtest.c

@@ -593,6 +593,7 @@ mymain(void)
     int ret = 0;
     char *fakerootdir;
     bool skipLegacyCPUs = false;
+    char *capslatest_x86_64 = NULL;
 
     if (VIR_STRDUP_QUIET(fakerootdir, FAKEROOTDIRTEMPLATE) < 0) {
         fprintf(stderr, "Out of memory\n");
@@ -658,6 +659,73 @@ mymain(void)
     if (VIR_STRDUP_QUIET(driver.config->memoryBackingDir, "/var/lib/libvirt/qemu/ram") < 0)
         return EXIT_FAILURE;
 
+    if (!(capslatest_x86_64 = testQemuGetLatestCapsForArch(abs_srcdir "/qemucapabilitiesdata",
+                                                           "x86_64", "xml")))
+        return EXIT_FAILURE;
+
+    VIR_TEST_VERBOSE("\nlatest caps x86_64: %s\n", capslatest_x86_64);
+
+
+/**
+ * The following set of macros allows testing of XML -> argv conversion with a
+ * real set of capabilities gathered from a real qemu copy. It is desired to use
+ * these for positive test cases as it provides combinations of flags which
+ * can be met in real life.
+ *
+ * The capabilities are taken from the real capabilities stored in
+ * tests/qemucapabilitiesdata.
+ *
+ * It is suggested to use the DO_TEST_CAPS_LATEST macro which always takes the
+ * most recent capability set. In cases when the new code would change behaviour
+ * the test cases should be forked using DO_TEST_CAPS_VER with the appropriate
+ * version.
+ */
+# define DO_TEST_CAPS_INTERNAL(name, suffix, migrateFrom, flags, parseFlags, \
+                               gic, arch, capsfile) \
+    do { \
+        static struct testInfo info = { \
+            name, "." suffix, NULL, migrateFrom, migrateFrom ? 7 : -1,\
+            (flags), parseFlags, false, NULL \
+        }; \
+        info.skipLegacyCPUs = skipLegacyCPUs; \
+        if (testInitQEMUCaps(&info, gic) < 0) \
+            return EXIT_FAILURE; \
+        if (!(info.qemuCaps = qemuTestParseCapabilitiesArch(virArchFromString(arch), \
+                                                            capsfile))) \
+            return EXIT_FAILURE; \
+        if (virTestRun("QEMU XML-2-ARGV " name "." suffix, \
+                       testCompareXMLToArgv, &info) < 0) \
+            ret = -1; \
+        virObjectUnref(info.qemuCaps); \
+        virObjectUnref(info.vm); \
+    } while (0)
+
+# define TEST_CAPS_PATH abs_srcdir "/qemucapabilitiesdata/caps_"
+
+# define DO_TEST_CAPS_ARCH_VER_FULL(name, flags, parseFlags, gic, arch, ver) \
+    DO_TEST_CAPS_INTERNAL(name, arch "-" ver, NULL, flags, parseFlags, gic, \
+                          arch, TEST_CAPS_PATH ver "." arch ".xml")
+
+# define DO_TEST_CAPS_ARCH_VER(name, gic, arch, ver) \
+    DO_TEST_CAPS_ARCH_VER_FULL(name, 0, 0, gic, arch, ver)
+
+# define DO_TEST_CAPS_VER(name, ver) \
+    DO_TEST_CAPS_ARCH_VER(name, GIC_NONE, "x86_64", ver)
+
+# define DO_TEST_CAPS_LATEST(name) \
+    DO_TEST_CAPS_INTERNAL(name, "x86_64-latest", NULL, 0, 0, GIC_NONE, "x86_64", \
+                          capslatest_x86_64)
+
+/**
+ * The following test macros should be used only in cases when the tests require
+ * testing of some non-standard combination of capability flags
+ */
+# define DO_TEST_CAPS_FULL(name, flags, parseFlags, ver) \
+    DO_TEST_CAPS_ARCH(name, NULL, flags, parseFlags, GIC_NONE, "x86_64", ver)
+
+# define DO_TEST_CAPS(name, ver) \
+    DO_TEST_CAPS_FULL(name, 0, 0, ver)
+
 # define DO_TEST_FULL(name, migrateFrom, migrateFd, flags, \
                       parseFlags, gic, ...) \
     do { \
@@ -2769,6 +2837,7 @@ mymain(void)
 
     qemuTestDriverFree(&driver);
     VIR_FREE(fakerootdir);
+    VIR_FREE(capslatest_x86_64);
 
     return ret == 0 ? EXIT_SUCCESS : EXIT_FAILURE;
 }