[Devel] [PATCH vz10 v2] selftests/tdx: skip when the TDX guest device is absent

[Konstantin Khorenko <khorenko@virtuozzo.com>]

From: Eva Kurchatova <eva.kurchatova@virtuozzo.com>

verify_report fails outside a TDX guest, where /dev/tdx_guest does not
exist.

Skip only when the device node is missing, so that a real open()
failure, EPERM or EBUSY, still fails the test instead of being
reported as a skip.

https://virtuozzo.atlassian.net/browse/VSTOR-142444
Feature: fix selftests
Signed-off-by: Eva Kurchatova <eva.kurchatova@virtuozzo.com>
Signed-off-by: Konstantin Khorenko <khorenko@virtuozzo.com>
---
Changes in v2:
- skip only when the device node itself is missing (errno == ENOENT).
  v1 skipped on any open() failure, so a real problem such as EPERM or
  EBUSY was reported as a skip instead of a failure.  As a side effect
  the following ASSERT_LT() is reachable again and no longer dead code.
- commit message: explain why the skip is narrowed to a missing node.

 tools/testing/selftests/tdx/tdx_guest_test.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/tools/testing/selftests/tdx/tdx_guest_test.c b/tools/testing/selftests/tdx/tdx_guest_test.c
index 81d8cb88ea1a..612005b10f7c 100644
--- a/tools/testing/selftests/tdx/tdx_guest_test.c
+++ b/tools/testing/selftests/tdx/tdx_guest_test.c
@@ -135,6 +135,8 @@ TEST(verify_report)
 	int devfd, i;
 
 	devfd = open(TDX_GUEST_DEVNAME, O_RDWR | O_SYNC);
+	if (devfd < 0 && errno == ENOENT)
+		SKIP(return, "TDX guest device is not available");
 	ASSERT_LT(0, devfd);
 
 	/* Generate sample report data */
-- 
2.47.1