[RFC,v1,00/10] KVM: s390: Do storage key checking

Message

Janis Schoetterl-Glausch Jan. 18, 2022, 9:52 a.m. UTC

Check keys when emulating instructions and let user space do key checked
accesses.
User space can do so via an extension of the MEMOP IOCTL:
* allow optional key checking
* allow MEMOP on vm fd, so key checked accesses on absolute memory
  become possible

TODO:
* Documentation changes for MEMOP
* Consider redesign of capability for MEMOP

Janis Schoetterl-Glausch (10):
  s390/uaccess: Add storage key checked access to user memory
  KVM: s390: Honor storage keys when accessing guest memory
  KVM: s390: handle_tprot: Honor storage keys
  KVM: s390: selftests: Test TEST PROTECTION emulation
  KVM: s390: Add optional storage key checking to MEMOP IOCTL
  KVM: s390: Add vm IOCTL for key checked guest absolute memory access
  KVM: s390: Rename existing vcpu memop functions
  KVM: s390: selftests: Test memops with storage keys
  KVM: s390: Add capability for storage key extension of MEM_OP IOCTL
  KVM: s390: selftests: Make use of capability in MEM_OP test

 arch/s390/include/asm/ctl_reg.h           |   2 +
 arch/s390/include/asm/page.h              |   2 +
 arch/s390/include/asm/uaccess.h           |  32 ++
 arch/s390/kvm/gaccess.c                   | 237 ++++++++-
 arch/s390/kvm/gaccess.h                   |  85 +++-
 arch/s390/kvm/intercept.c                 |  12 +-
 arch/s390/kvm/kvm-s390.c                  | 122 ++++-
 arch/s390/kvm/priv.c                      |  66 +--
 arch/s390/lib/uaccess.c                   |  57 ++-
 include/uapi/linux/kvm.h                  |   4 +
 tools/testing/selftests/kvm/.gitignore    |   1 +
 tools/testing/selftests/kvm/Makefile      |   1 +
 tools/testing/selftests/kvm/s390x/memop.c | 560 +++++++++++++++++++---
 tools/testing/selftests/kvm/s390x/tprot.c | 184 +++++++
 14 files changed, 1207 insertions(+), 158 deletions(-)
 create mode 100644 tools/testing/selftests/kvm/s390x/tprot.c


base-commit: bad13799e0305deb258372b7298a86be4c78aaba
prerequisite-patch-id: 5f8ae41bde2fa5717a775e17c08239ed1ddbcc83