[PATCH v2 1/2] tests: migration-test: Still run the rest even if uffd missing

[Peter Xu <peterx@redhat.com>]

Currently we'll skip the whole migration-test if uffd missing.

It's a bit harsh - we can still run the rest besides postcopy!  Enable them
when we still can.

It'll happen more frequently now after kernel UFFD_USER_MODE_ONLY introduced in
commit 37cd0575b8510159, as qemu test normally requires kernel faults.  One
alternative is we disable kvm and create the uffd with UFFD_USER_MODE_ONLY for
all postcopy tests, however to be simple for now just skip postcopy tests only
by default.  If we wanna run them use "sudo" or root, they'll still work.  In
all cases, it's still better than running nothing for migration-test.

Reviewed-by: Dr. David Alan Gilbert <dgilbert@redhat.com>
Signed-off-by: Peter Xu <peterx@redhat.com>
---
 tests/qtest/migration-test.c | 11 +++++------
 1 file changed, 5 insertions(+), 6 deletions(-)

diff --git a/tests/qtest/migration-test.c b/tests/qtest/migration-test.c
index 2b028df6875..d9225f58d4d 100644
--- a/tests/qtest/migration-test.c
+++ b/tests/qtest/migration-test.c
@@ -1376,10 +1376,6 @@ int main(int argc, char **argv)
 
     g_test_init(&argc, &argv, NULL);
 
-    if (!ufd_version_check()) {
-        return g_test_run();
-    }
-
     /*
      * On ppc64, the test only works with kvm-hv, but not with kvm-pr and TCG
      * is touchy due to race conditions on dirty bits (especially on PPC for
@@ -1416,8 +1412,11 @@ int main(int argc, char **argv)
 
     module_call_init(MODULE_INIT_QOM);
 
-    qtest_add_func("/migration/postcopy/unix", test_postcopy);
-    qtest_add_func("/migration/postcopy/recovery", test_postcopy_recovery);
+    if (ufd_version_check()) {
+        qtest_add_func("/migration/postcopy/unix", test_postcopy);
+        qtest_add_func("/migration/postcopy/recovery", test_postcopy_recovery);
+    }
+
     qtest_add_func("/migration/bad_dest", test_baddest);
     qtest_add_func("/migration/precopy/unix", test_precopy_unix);
     qtest_add_func("/migration/precopy/tcp", test_precopy_tcp);
-- 
2.31.1