[v1,00/13] KVM: s390: Stop using page->index and other things

Message

Claudio Imbrenda Jan. 8, 2025, 6:14 p.m. UTC

This patchseries starts moving some of the gmap logic into KVM itself,
going towards the final goal of completely removing gmap from the
non-kvm memory management code. Aside from just moving some code from
mm/gmap into kvm, this series also starts using __kvm_faultin_pfn() to
fault-in pages as needed.

But more importantly, this series removes almost all uses of
page->index (and all uses of page->lru) from the s390 KVM code.
The only remaining use is for the vsie pages, but that has already been
taken care of by David in another series.

Unfortunately the mix of hastiness and holidays means that this series
is a little bit all over the place, and not as complete as I would have
liked to.

I'm posting it now so to try to speed up the removal of page->index,
hopefully I will be able to post another short series before the
upcoming merge window closes.

Claudio Imbrenda (13):
  KVM: s390: wrapper for KVM_BUG
  KVM: s390: fake memslots for ucontrol VMs
  KVM: s390: use __kvm_faultin_pfn()
  KVM: s390: move pv gmap functions into kvm
  KVM: s390: get rid of gmap_fault()
  KVM: s390: get rid of gmap_translate()
  KVM: s390: move some gmap shadowing functions away from mm/gmap.c
  KVM: s390: stop using page->index for non-shadow gmaps
  KVM: s390: stop using lists to keep track of used dat tables
  KVM: s390: move gmap_shadow_pgt_lookup() into kvm
  KVM: s390: remove useless page->index usage
  KVM: s390: move PGSTE softbits
  KVM: s390: remove the last user of page->index

 arch/s390/include/asm/gmap.h    |  16 +-
 arch/s390/include/asm/pgtable.h |  21 +-
 arch/s390/include/asm/uv.h      |   7 +-
 arch/s390/kernel/uv.c           | 293 +++------------
 arch/s390/kvm/Makefile          |   2 +-
 arch/s390/kvm/gaccess.c         |  42 +++
 arch/s390/kvm/gmap.c            | 183 ++++++++++
 arch/s390/kvm/gmap.h            |  19 +
 arch/s390/kvm/intercept.c       |   5 +-
 arch/s390/kvm/interrupt.c       |  19 +-
 arch/s390/kvm/kvm-s390.c        | 229 ++++++++++--
 arch/s390/kvm/kvm-s390.h        |  18 +
 arch/s390/kvm/pv.c              |   1 +
 arch/s390/kvm/vsie.c            | 137 +++++++
 arch/s390/mm/gmap.c             | 630 ++++++--------------------------
 15 files changed, 786 insertions(+), 836 deletions(-)
 create mode 100644 arch/s390/kvm/gmap.c
 create mode 100644 arch/s390/kvm/gmap.h