[PATCH v3 0/6] KVM: s390: Enable 4k granularity for memslots

[Claudio Imbrenda]

Currently the memslot granularity for s390 VMs is 1M. Both the s390
core architecture and virtio-mem only support a 1M granularity for
guest memory.

Notwithstanding the official architectural limits, it can be beneficial
to support memslots with 4k granularity. With the new gmap code, this
is a quite simple change. This allows us to enable more existing
selftests and makes KVM on s390 more future proof.


v2->v3
* Remove more 1M-alignment #ifdefs in the kvm selftests.
* Do not remove the common tests from loongarch, since loongarch does
  not include the common tests by default.
* Opportunistically fix a potential NULL pointer dereference when
  memslots for UCONTROL guests are attempted to be removed (does not
  actually happen in practice).

v1->v2
* Fixed the first patch (thanks Christian)


Claudio Imbrenda (6):
  KVM: s390: Add some useful mask macros
  KVM: s390: Add alignment checks for hugepages
  KVM: s390: Allow 4k granularity for memslots
  KVM: selftests: Remove 1M alignment requirement for s390
  KVM: s390: selftests: enable some common memory-related tests
  KVM: s390: ucontrol: Fix memslot handling

 arch/s390/kvm/dat.h                           |  5 +++
 arch/s390/kvm/faultin.c                       |  2 +-
 arch/s390/kvm/gaccess.c                       |  2 +-
 arch/s390/kvm/gmap.c                          | 32 +++++++++++++++----
 arch/s390/kvm/gmap.h                          |  3 +-
 arch/s390/kvm/kvm-s390.c                      | 22 ++++---------
 tools/testing/selftests/kvm/Makefile.kvm      |  9 ++----
 tools/testing/selftests/kvm/dirty_log_test.c  |  3 --
 .../testing/selftests/kvm/include/kvm_util.h  |  4 ---
 .../selftests/kvm/kvm_page_table_test.c       |  3 --
 tools/testing/selftests/kvm/lib/kvm_util.c    |  9 +-----
 tools/testing/selftests/kvm/lib/memstress.c   |  4 ---
 .../selftests/kvm/pre_fault_memory_test.c     |  4 ---
 .../selftests/kvm/set_memory_region_test.c    |  9 +-----
 14 files changed, 47 insertions(+), 64 deletions(-)

-- 
2.53.0