Implement KVM_PRE_FAULT_MEMORY on s390, and update documentation and
selftests accordingly.

Faulted-in pages will be marked as accessed, unlike x86, otherwise they
will trigger a minor fault when accessed. Avoiding such faults is one of
the points of KVM_PRE_FAULT_MEMORY.

CCing x86 people due to changes in the documentation and the selftests

Claudio Imbrenda (4):
  KVM: s390: Implement KVM_PRE_FAULT_MEMORY
  KVM: s390: Update KVM_PRE_FAULT_MEMORY API documentation
  KVM: selftests: Fix pre_fault_memory_test to run on s390
  KVM: selftests: Enable pre_fault_memory_test for s390

 Documentation/virt/kvm/api.rst                |  5 ++-
 arch/s390/kvm/Kconfig                         |  1 +
 arch/s390/kvm/kvm-s390.c                      | 41 +++++++++++++++++++
 tools/testing/selftests/kvm/Makefile.kvm      |  1 +
 .../selftests/kvm/pre_fault_memory_test.c     |  7 ++--
 5 files changed, 50 insertions(+), 5 deletions(-)

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2.54.0