[PATCH v3 0/4] KVM: guest_memfd: fix NUMA selftests

[Shivank Garg]

NUMA selftests in guest_memfd_test assumes that node 0 and 1 exist and
have memory. However, nodes can be sparse or memoryless which would
break this selftest.  Select the nodes from MPOL_F_MEMS_ALLOWED instead.

Based on KVM: selftests: Fix maxnodes bugs and cleanup related code [1]

Tested on a 7.3-rc1+, AMD EPYC 7713.

[1] https://lore.kernel.org/kvm/20260903001625.2792367-1-seanjc@xxxxxxxxxx

Changes in v3:
- Rebase on Sean's spin-off series [1] which picks up patch 1 and 2.
- Drop Patch 3 as version in [1] is better. (Sean)
- Split patch 4 of V2 into 4 patches. (Sean)
- Use MAXNODE_FOR_MASK() for maxnode value. (Sean)
- Link to v2: https://lore.kernel.org/r/20260901-gmem-selftests-fix-v2-0-5a273153354c@xxxxxxx

Changes in V2:
- Split from unbind race fix. (Sean)
- Include <linux/bits.h> that defines BITS_PER_TYPE for self-containment. (Sashiko)
- Link to V1: https://lore.kernel.org/kvm/20260823-shivank-gmem-fix-split-v1-0-512a29fb8e86@xxxxxxx

Signed-off-by: Shivank Garg <shivankg@xxxxxxx>
---
Shivank Garg (4):
      KVM: selftests: Prepare guest_memfd_test for arbitrary NUMA nodes
      KVM: selftests: Use an allowed memory node in test_mbind()
      KVM: selftests: Use allowed memory nodes in test_numa_allocation()
      KVM: selftests: Drop unused sysfs NUMA helpers

 tools/testing/selftests/kvm/guest_memfd_test.c | 61 +++++++++++++++++---------
 tools/testing/selftests/kvm/include/numaif.h   | 52 ----------------------
 2 files changed, 40 insertions(+), 73 deletions(-)
---
base-commit: 88405f0ad1d5c680afe3ea0ce9345fa9e1deaac8
change-id: 20260901-gmem-selftests-fix-2a5e94192f79
prerequisite-message-id: <20260903001625.2792367-1-seanjc@xxxxxxxxxx>
prerequisite-patch-id: 6424a3d1e4b372d513b201984c97181a9fc2320d
prerequisite-patch-id: 1d0e83e328934e90b0e8cb9e4c47f9c7c2d12f9b
prerequisite-patch-id: 11bb6b35408a3f251ae7300aa6f1cde2f3ebfac1
prerequisite-patch-id: 7b68398ae0815a4892358359bd067b4cf84c4912
prerequisite-patch-id: 91a2873eeff8555ff7bc728e29a797a07247bdc6
prerequisite-patch-id: d068f85c63973f8bd7606cdb771a3d007b75ad02
prerequisite-patch-id: 26bcf27d961c67b4173bb418fda0a581a6c8a72c

Best regards,
-- 
Shivank Garg <shivankg@xxxxxxx>