[Devel] [PATCH VZ10 v3 0/3] Improvements for ve selftests

[Vladimir Riabchun]

This change adds helpers for creating and preserving various
namespaces and running functions inside them.
This appeared useful while implementing ve mount accounting
selftests - it required keeping mount namespace alive and
doing different things at different moments of time.

To make setns work with CLONE_NEWVE without starting VE,
the last patch changes -EINVAL return to warning message.

https://virtuozzo.atlassian.net/browse/VSTOR-144504

Feature: ve selftests
Signed-off-by: Vladimir Riabchun <vladimir.riabchun at virtuozzo.com>
---
Changes in v3:
- Patch 1: wrap flag -> (flag) in macros, undef them after use.
- Patch 2: Fix comments in run_in_ve function.
- Link to v2: http://lore.virtuozzo.com/20260909-ve-selftest-improv-v2-0-aad0a25d6569@virtuozzo.com

Changes in v2:
- Patch 1: fixed JOIN_NS order in enter_namespaces, added proper
  cleanup in prepare_namespaces.
- Patch 2: increased buf size in write_u64_at, added range check in
  read_s32_at, separated setup failures in run_in_ve from fn setup
  failures.
- Patch 3: Removed kselftests mention.
- Sashiko review: https://sashiko.vzint.dev/#/patchset/sashiko-inject-1788867622-560139540%40sashiko.local
- Link to v1: http://lore.virtuozzo.com/20260907-ve-selftest-improv-v1-0-a17847abbd48@virtuozzo.com

---
Vladimir Riabchun (3):
      selftests/ve: Add namespace management helpers
      selftests/ve: Add more helpers
      ve_namespace: Allow entering non-running VE namespace

 kernel/ve/ve_namespace.c                 |   3 +-
 tools/testing/selftests/ve/ve_selftest.h | 211 ++++++++++++++++++++++++++++++-
 2 files changed, 206 insertions(+), 8 deletions(-)
---
base-commit: 04cfdce5ceb48a93de722643c2afe8065ca8fc10
change-id: 20260907-ve-selftest-improv-2d043d021cae

Best regards,
--  
Vladimir Riabchun <vladimir.riabchun at virtuozzo.com>