tests/qtest: Check for virtio-blk before using -cdrom with the arm virt machine

The arm "virt" machine needs "virtio-blk-pci" for devices that get attached
via the "-cdrom" option. Since this is an optional device that might not
be available in the binary, we should check for the availability of this
device first before using it.

Message-Id: <20230525081016.1870364-3-thuth@redhat.com>
Reviewed-by: Fabiano Rosas <farosas@suse.de>
Signed-off-by: Thomas Huth <thuth@redhat.com>

tests/qtest/bios-tables-test.c

@@ -2164,7 +2164,7 @@ int main(int argc, char *argv[])
             }
         }
     } else if (strcmp(arch, "aarch64") == 0) {
-        if (has_tcg) {
+        if (has_tcg && qtest_has_device("virtio-blk-pci")) {
             qtest_add_func("acpi/virt", test_acpi_virt_tcg);
             qtest_add_func("acpi/virt/acpihmatvirt",
                             test_acpi_virt_tcg_acpi_hmat);

tests/qtest/cdrom-test.c

@@ -264,9 +264,13 @@ int main(int argc, char **argv)
         const char *armmachines[] = {
             "realview-eb", "realview-eb-mpcore", "realview-pb-a8",
             "realview-pbx-a9", "versatileab", "versatilepb", "vexpress-a15",
-            "vexpress-a9", "virt", NULL
+            "vexpress-a9", NULL
         };
         add_cdrom_param_tests(armmachines);
+        if (qtest_has_device("virtio-blk-pci")) {
+            const char *virtmachine[] = { "virt", NULL };
+            add_cdrom_param_tests(virtmachine);
+        }
     } else {
         const char *nonemachine[] = { "none", NULL };
         add_cdrom_param_tests(nonemachine);