diff --git a/hw/i386/pc_piix.c b/hw/i386/pc_piix.c
index 9cceae3..22dee0e 100644
--- a/hw/i386/pc_piix.c
+++ b/hw/i386/pc_piix.c
@@ -948,13 +948,26 @@
 
 
 #ifdef CONFIG_XEN
-static void xenfv_machine_options(MachineClass *m)
+static void xenfv_4_2_machine_options(MachineClass *m)
 {
+    pc_i440fx_4_2_machine_options(m);
     m->desc = "Xen Fully-virtualized PC";
     m->max_cpus = HVM_MAX_VCPUS;
     m->default_machine_opts = "accel=xen";
 }
 
-DEFINE_PC_MACHINE(xenfv, "xenfv", pc_xen_hvm_init,
-                  xenfv_machine_options);
+DEFINE_PC_MACHINE(xenfv_4_2, "xenfv-4.2", pc_xen_hvm_init,
+                  xenfv_4_2_machine_options);
+
+static void xenfv_3_1_machine_options(MachineClass *m)
+{
+    pc_i440fx_3_1_machine_options(m);
+    m->desc = "Xen Fully-virtualized PC";
+    m->alias = "xenfv";
+    m->max_cpus = HVM_MAX_VCPUS;
+    m->default_machine_opts = "accel=xen";
+}
+
+DEFINE_PC_MACHINE(xenfv, "xenfv-3.1", pc_xen_hvm_init,
+                  xenfv_3_1_machine_options);
 #endif
diff --git a/tests/qtest/device-introspect-test.c b/tests/qtest/device-introspect-test.c
index 04f2290..f2c1576 100644
--- a/tests/qtest/device-introspect-test.c
+++ b/tests/qtest/device-introspect-test.c
@@ -288,7 +288,7 @@
     char *path, *args;
 
     /* Ignore blacklisted machines */
-    if (g_str_equal("xenfv", mname) || g_str_equal("xenpv", mname)) {
+    if (!memcmp("xenfv", mname, 5) || g_str_equal("xenpv", mname)) {
         return;
     }
 
diff --git a/tests/qtest/qom-test.c b/tests/qtest/qom-test.c
index 4f94cc6..e338a41 100644
--- a/tests/qtest/qom-test.c
+++ b/tests/qtest/qom-test.c
@@ -15,35 +15,6 @@
 #include "qemu/cutils.h"
 #include "libqtest.h"
 
-static const char *blacklist_x86[] = {
-    "xenfv", "xenpv", NULL
-};
-
-static const struct {
-    const char *arch;
-    const char **machine;
-} blacklists[] = {
-    { "i386", blacklist_x86 },
-    { "x86_64", blacklist_x86 },
-};
-
-static bool is_blacklisted(const char *arch, const char *mach)
-{
-    int i;
-    const char **p;
-
-    for (i = 0; i < ARRAY_SIZE(blacklists); i++) {
-        if (!strcmp(blacklists[i].arch, arch)) {
-            for (p = blacklists[i].machine; *p; p++) {
-                if (!strcmp(*p, mach)) {
-                    return true;
-                }
-            }
-        }
-    }
-    return false;
-}
-
 static void test_properties(QTestState *qts, const char *path, bool recurse)
 {
     char *child_path;
@@ -108,13 +79,16 @@
 
 static void add_machine_test_case(const char *mname)
 {
-    const char *arch = qtest_get_arch();
+    char *path;
 
-    if (!is_blacklisted(arch, mname)) {
-        char *path = g_strdup_printf("qom/%s", mname);
-        qtest_add_data_func(path, g_strdup(mname), test_machine);
-        g_free(path);
+    /* Ignore blacklisted machines that have known problems */
+    if (!memcmp("xenfv", mname, 5) || g_str_equal("xenpv", mname)) {
+        return;
     }
+
+    path = g_strdup_printf("qom/%s", mname);
+    qtest_add_data_func(path, g_strdup(mname), test_machine);
+    g_free(path);
 }
 
 int main(int argc, char **argv)
diff --git a/tests/qtest/test-hmp.c b/tests/qtest/test-hmp.c
index 5029c4d..f8aa5f9 100644
--- a/tests/qtest/test-hmp.c
+++ b/tests/qtest/test-hmp.c
@@ -143,7 +143,7 @@
     char *path;
 
     /* Ignore blacklisted machines that have known problems */
-    if (!strcmp("xenfv", mname) || !strcmp("xenpv", mname)) {
+    if (!memcmp("xenfv", mname, 5) || g_str_equal("xenpv", mname)) {
         return;
     }