linux-kernel - [PATCH v3 0/4] KVM: s390: some cleanup and small fixes

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Message-ID: <20250522132259.167708-1-imbrenda@linux.ibm.com>
Date: Thu, 22 May 2025 15:22:55 +0200
From: Claudio Imbrenda <imbrenda@...ux.ibm.com>
To: linux-kernel@...r.kernel.org
Cc: kvm@...r.kernel.org, linux-s390@...r.kernel.org, frankja@...ux.ibm.com,
        borntraeger@...ibm.com, seiden@...ux.ibm.com, nsg@...ux.ibm.com,
        nrb@...ux.ibm.com, david@...hat.com, hca@...ux.ibm.com,
        agordeev@...ux.ibm.com, svens@...ux.ibm.com, gor@...ux.ibm.com,
        schlameuss@...ux.ibm.com
Subject: [PATCH v3 0/4] KVM: s390: some cleanup and small fixes

This series has some cleanups and small fixes in preparation of the
upcoming series that will finally completely move all guest page table
handling into kvm. The cleaups and fixes in this series are good enough
on their own, hence why they are being sent now.

v2->v3  (mainly addresses Nina's and Heiko's comments)
* drop patch 3 - it was just an attempt to clean up the code a little
  and make it more readable, but there were too many issues to address
* remove all dead code from s390/mm/gmap.c that is being replaced by
  code in s390/mm/gmap_helpers.c
* remove a couple of unused functions from s390/mm/gmap_helpers.c, some
  of them will be introduced again in a later series when they are
  actually needed
* added documentation to the functions in s390/mm/gmap_helpers.c
* general readability improvements

v1->v2
* remove uneeded "gmap.h" include from gaccess.c (thanks Christph)
* use a custom helper instead of u64_replace_bits() (thanks Nina)
* new helper functions in priv.c to increase readability (thanks Nina)
* add lockdep assertion in handle_essa() (thanks Nina)
* gmap_helper_disable_cow_sharing() will not take the mmap lock, and
  must now be called while already holding the mmap lock in write mode

Claudio Imbrenda (4):
  s390: remove unneeded includes
  KVM: s390: remove unneeded srcu lock
  KVM: s390: refactor and split some gmap helpers
  KVM: s390: simplify and move pv code

 MAINTAINERS                          |   2 +
 arch/s390/include/asm/gmap.h         |   2 -
 arch/s390/include/asm/gmap_helpers.h |  15 ++
 arch/s390/include/asm/tlb.h          |   1 +
 arch/s390/include/asm/uv.h           |   1 -
 arch/s390/kernel/uv.c                |  12 +-
 arch/s390/kvm/Makefile               |   2 +-
 arch/s390/kvm/diag.c                 |  13 +-
 arch/s390/kvm/gaccess.c              |   3 +-
 arch/s390/kvm/gmap-vsie.c            |   1 -
 arch/s390/kvm/gmap.c                 | 121 ---------------
 arch/s390/kvm/gmap.h                 |  39 -----
 arch/s390/kvm/intercept.c            |   9 +-
 arch/s390/kvm/kvm-s390.c             |  10 +-
 arch/s390/kvm/kvm-s390.h             |  42 +++++
 arch/s390/kvm/priv.c                 |   6 +-
 arch/s390/kvm/pv.c                   |  61 +++++++-
 arch/s390/kvm/vsie.c                 |  19 ++-
 arch/s390/mm/Makefile                |   2 +
 arch/s390/mm/fault.c                 |   1 -
 arch/s390/mm/gmap.c                  | 158 +------------------
 arch/s390/mm/gmap_helpers.c          | 223 +++++++++++++++++++++++++++
 arch/s390/mm/init.c                  |   1 -
 arch/s390/mm/pgalloc.c               |   2 -
 arch/s390/mm/pgtable.c               |   1 -
 25 files changed, 395 insertions(+), 352 deletions(-)
 create mode 100644 arch/s390/include/asm/gmap_helpers.h
 delete mode 100644 arch/s390/kvm/gmap.c
 delete mode 100644 arch/s390/kvm/gmap.h
 create mode 100644 arch/s390/mm/gmap_helpers.c

-- 
2.49.0