[PATCH v2 00/20] KVM: selftests: Fixes and cleanups for dirty_log_test

[Sean Christopherson <seanjc@google.com>]

Fix a variety of flaws and false failures/passes in dirty_log_test, and
drop code/behavior that adds complexity while adding little-to-no benefit.

Lots of details in the changelogs, and a partial list of complaints[1] in
Maxim's original thread[2].

[1] https://lore.kernel.org/all/Z1vR25ylN5m_DRSy@google.com
[2] https://lore.kernel.org/all/20241211193706.469817-1-mlevitsk@redhat.com

v2:
 - Collect reviews. [Maxim]
 - Expand a few changelogs to be more explicit about the effects. [Maxim]
 - Print the number of writes from each iteration. [Maxim]
 - Fix goofs in the last patch (stale message and changelog). [Maxim]

v1: https://lore.kernel.org/all/20241214010721.2356923-1-seanjc@google.com

Maxim Levitsky (2):
  KVM: selftests: Support multiple write retires in dirty_log_test
  KVM: selftests: Limit dirty_log_test's s390x workaround to s390x

Sean Christopherson (18):
  KVM: selftests: Sync dirty_log_test iteration to guest *before*
    resuming
  KVM: selftests: Drop signal/kick from dirty ring testcase
  KVM: selftests: Drop stale srandom() initialization from
    dirty_log_test
  KVM: selftests: Precisely track number of dirty/clear pages for each
    iteration
  KVM: selftests: Read per-page value into local var when verifying
    dirty_log_test
  KVM: selftests: Continuously reap dirty ring while vCPU is running
  KVM: selftests: Honor "stop" request in dirty ring test
  KVM: selftests: Keep dirty_log_test vCPU in guest until it needs to
    stop
  KVM: selftests: Post to sem_vcpu_stop if and only if vcpu_stop is true
  KVM: selftests: Use continue to handle all "pass" scenarios in
    dirty_log_test
  KVM: selftests: Print (previous) last_page on dirty page value
    mismatch
  KVM: selftests: Collect *all* dirty entries in each dirty_log_test
    iteration
  KVM: sefltests: Verify value of dirty_log_test last page isn't bogus
  KVM: selftests: Ensure guest writes min number of pages in
    dirty_log_test
  KVM: selftests: Tighten checks around prev iter's last dirty page in
    ring
  KVM: selftests: Set per-iteration variables at the start of each
    iteration
  KVM: selftests: Fix an off-by-one in the number of dirty_log_test
    iterations
  KVM: selftests: Allow running a single iteration of dirty_log_test

 tools/testing/selftests/kvm/dirty_log_test.c | 521 +++++++++----------
 1 file changed, 246 insertions(+), 275 deletions(-)


base-commit: 10485c4bc3caad3e93a6a4e99003e8ffffcd826a
-- 
2.47.1.613.gc27f4b7a9f-goog