[PATCH 0/5] KVM: selftests: access_tracking_perf_test fixes for NUMA balancing and MGLRU

From: James Houghton
Date: Wed Mar 26 2025 - 21:24:59 EST


This is a follow-up from Maxim's recent v2[1] and the selftest changes
from the v8 of the x86 lockless aging series[2].

With MGLRU, touching a page doesn't necessarily clear the Idle flag.
This has come up in the past, and the recommendation was to use MGLRU
generation numbers[3], which is what this series does.

With NUMA balancing, pages are temporarily mapped as PROT_NONE, so the
SPTEs will be zapped, losing the Accessed bits. The fix here is, in the
event we have lost access information to print a warning and continue
with the test, just like what we do if the test is running a nested VM.

A flag is added for the user to specify if they wish for the test to
always enforce or always skip this check.

Based on kvm/next.

[1]: https://lore.kernel.org/all/20250325015741.2478906-1-mlevitsk@xxxxxxxxxx/
[2]: https://lore.kernel.org/kvm/20241105184333.2305744-12-jthoughton@xxxxxxxxxx/
[3]: https://lore.kernel.org/all/CAOUHufZeADNp_y=Ng+acmMMgnTR=ZGFZ7z-m6O47O=CmJauWjw@xxxxxxxxxxxxxx/

James Houghton (3):
cgroup: selftests: Move cgroup_util into its own library
KVM: selftests: Build and link selftests/cgroup/lib into KVM selftests
KVM: selftests: access_tracking_perf_test: Use MGLRU for access
tracking

Maxim Levitsky (1):
KVM: selftests: access_tracking_perf_test: Add option to skip the
sanity check

Sean Christopherson (1):
KVM: selftests: Extract guts of THP accessor to standalone sysfs
helpers

tools/testing/selftests/cgroup/Makefile | 21 +-
.../selftests/cgroup/{ => lib}/cgroup_util.c | 3 +-
.../cgroup/{ => lib/include}/cgroup_util.h | 4 +-
.../testing/selftests/cgroup/lib/libcgroup.mk | 12 +
tools/testing/selftests/kvm/Makefile.kvm | 4 +-
.../selftests/kvm/access_tracking_perf_test.c | 263 ++++++++++--
.../selftests/kvm/include/lru_gen_util.h | 51 +++
.../testing/selftests/kvm/include/test_util.h | 1 +
.../testing/selftests/kvm/lib/lru_gen_util.c | 383 ++++++++++++++++++
tools/testing/selftests/kvm/lib/test_util.c | 42 +-
10 files changed, 726 insertions(+), 58 deletions(-)
rename tools/testing/selftests/cgroup/{ => lib}/cgroup_util.c (99%)
rename tools/testing/selftests/cgroup/{ => lib/include}/cgroup_util.h (99%)
create mode 100644 tools/testing/selftests/cgroup/lib/libcgroup.mk
create mode 100644 tools/testing/selftests/kvm/include/lru_gen_util.h
create mode 100644 tools/testing/selftests/kvm/lib/lru_gen_util.c


base-commit: 782f9feaa9517caf33186dcdd6b50a8f770ed29b
--
2.49.0.395.g12beb8f557-goog