[PATCH v10 0/3] KVM: selftests: arm64: Improve diagnostics from set_id_regs

[Mark Brown]

While debugging issues related to aarch64 only systems I ran into
speedbumps due to the lack of detail in the results reported when the
guest register read and reset value preservation tests were run, they
generated an immediately fatal assert without indicating which register
was being tested. Update these tests to non-fatally report a standard
kselftest result per register, making it much easier to see what the
problem being reported is.

A similar issue exists with the validation of the individual bitfields
in registers due to the use of immediately fatal asserts. Update those
asserts to be standard kselftest reports.

Signed-off-by: Mark Brown <broonie@xxxxxxxxxx>
---
Changes in v10:
- Use __vcpu_set_reg() when testing valid writes to avoid asserts.
- Use local variable for reg_id more.
- Link to v9: https://patch.msgid.link/20261103-kvm-arm64-set-id-regs-aarch64-v9-0-ab32bc79fa9c@xxxxxxxxxx

Changes in v9:
- Rebase onto v7.4-rc1.
- Link to v8: https://patch.msgid.link/20260929-kvm-arm64-set-id-regs-aarch64-v8-0-58aabe2c2fac@xxxxxxxxxx

Changes in v8:
- Convert another assert.
- Link to v7: https://patch.msgid.link/20260901-kvm-arm64-set-id-regs-aarch64-v7-0-7b065b0bda9a@xxxxxxxxxx

Changes in v7:
- Rebase onto v7.3-rc1.
- Link to v6: https://patch.msgid.link/20260719-kvm-arm64-set-id-regs-aarch64-v6-0-724287f5f108@xxxxxxxxxx

Changes in v6:
- Rebase onto v7.2-rc3.
- Drop changes to handling of aarch32 related registers on 64 bit only
  systems, an in kernel solution is preferred for those.
- Use a define to count the non-test_regs registers.
- Link to v5: https://patch.msgid.link/20260317-kvm-arm64-set-id-regs-aarch64-v5-0-a60f2b956e22@xxxxxxxxxx

Changes in v5:
- Rebase onto v7.0-rc1.
- Link to v4: https://patch.msgid.link/20260106-kvm-arm64-set-id-regs-aarch64-v4-0-c7ef4551afb3@xxxxxxxxxx

Changes in v4:
- Correct check for 32 bit ID registers.
- Link to v3: https://patch.msgid.link/20251219-kvm-arm64-set-id-regs-aarch64-v3-0-bfa474ec3218@xxxxxxxxxx

Changes in v3:
- Rebase onto v6.19-rc1.
- Link to v2: https://patch.msgid.link/20251114-kvm-arm64-set-id-regs-aarch64-v2-0-672f214f41bf@xxxxxxxxxx

Changes in v2:
- Add a fix for spurious failures with 64 bit only guests.
- Link to v1: https://patch.msgid.link/20251030-kvm-arm64-set-id-regs-aarch64-v1-0-96fe0d2b178e@xxxxxxxxxx

---
Mark Brown (3):
      KVM: selftests: arm64: Report set_id_reg reads of test registers as tests
      KVM: selftests: arm64: Report register reset tests individually
      KVM: selftests: arm64: Make set_id_regs bitfield validity checks non-fatal

 tools/testing/selftests/kvm/arm64/set_id_regs.c | 152 +++++++++++++++++-------
 1 file changed, 111 insertions(+), 41 deletions(-)
---
base-commit: 6628e7d4c6b25c8d18f1345e3a20d21829aae7e4
base-tree: git://git.kernel.org/pub/scm/linux/kernel/git/rafael/linux-pm master
change-id: 20251028-kvm-arm64-set-id-regs-aarch64-ebb77969401c

Best regards,
--  
Mark Brown <broonie@xxxxxxxxxx>