[PATCH v6 00/10] KVM: s390: A bunch of gmap-related fixes

[Claudio Imbrenda <imbrenda@linux.ibm.com>]

Fix handling of _PAGE_UNUSED pte bit. The bit was lingering around
longer than it should have, causing issues. This is yet a different
approach from the previous version.

Fix some cmma dirty tracking functions.

Also fix a few other small issues in gmap.

v5->v6:
* Move locking back in the individual cases in kvm_s390_set_mem_control()
* Add commends and rework the handling of cmma dirty flags in
  kvm_s390_vm_{start,stop}_migration()
* Avoid potential deadlock in the unlikely case of a nested guest running
  with a real address space

v4->v5:
* Make sure the counter of cmma-dirty pages does not explode
* Improve comments in cmma selftest
* Rework and fix locking in kvm_s390_set_mem_control()
* Do not return success if an allocation in kvm_s390_set_cmma_bits() fails

v3->v4:
* Improve/fix descriptions of patches 1 and 3
* Fix handle_{sske,pfmf} under memory pressure
* Fix cmma dirty tracking and its selftest

v2->v3:
* Fix _PAGE_UNUSED in yet a different way
* Fix a potential overflow in dat_peek_cmma()
* Some minor gmap fixes that are not actual bugs yet

v1->v2:
* Completely different approach, entirely new patch

Claudio Imbrenda (10):
  s390/mm: Fix handling of _PAGE_UNUSED pte bit
  KVM: s390: Fix dat_peek_cmma() overflow
  KVM: s390: Do not set special large pages dirty
  KVM: s390: Fix code typo in gmap_protect_asce_top_level()
  KVM: s390: Fix handle_{sske,pfmf} under memory pressure
  KVM: s390: Fix locking in kvm_s390_set_mem_control()
  KVM: s390: Fix cmma dirty tracking
  KVM: s390: selftests: Fix cmma selftest
  KVM: s390: Return failure in case of failure in
    kvm_s390_set_cmma_bits()
  KVM: s390: vsie: Avoid potential deadlock with real spaces

 arch/s390/include/asm/pgtable.h              |  4 +-
 arch/s390/kvm/dat.c                          |  5 +-
 arch/s390/kvm/gmap.c                         | 41 +++++++++---
 arch/s390/kvm/gmap.h                         | 12 +++-
 arch/s390/kvm/kvm-s390.c                     | 66 +++++++++++++-------
 arch/s390/kvm/priv.c                         | 10 ++-
 arch/s390/mm/gmap_helpers.c                  |  3 +-
 tools/testing/selftests/kvm/s390/cmma_test.c |  6 ++
 8 files changed, 111 insertions(+), 36 deletions(-)

-- 
2.54.0