[V1 PATCH 0/6] selftests: KVM: selftests for fd-based private memory

[Vishal Annapurve]

This series implements selftests targeting the feature floated by Chao
via:
https://lore.kernel.org/linux-mm/20221109041358.GA118963@xxxxxxxxxxxxxxxxxx/T/

Below changes aim to test the fd based approach for guest private memory
in context of normal (non-confidential) VMs executing on non-confidential
platforms.

private_mem_test.c file adds selftest to access private memory from the
guest via private/shared accesses and checking if the contents can be
leaked to/accessed by vmm via shared memory view before/after conversions.

Updates in V1 (Compared to RFC v3 patches):
1) Incorporated suggestions from Sean around simplifying KVM changes
2) Addressed comments from Sean
3) Added private mem test with shared memory backed by 2MB hugepages.

RFC v3 series:
https://lore.kernel.org/lkml/20220819174659.2427983-1-vannapurve@xxxxxxxxxx/t/

This series has dependency on following patches:
1) V9 series patches from Chao mentioned above.

Github link for the patches posted as part of this series:
https://github.com/vishals4gh/linux/commits/priv_memfd_selftests-v1

Vishal Annapurve (6):
  KVM: x86: Add support for testing private memory
  KVM: Selftests: Add support for private memory
  KVM: selftests: x86: Add IS_ALIGNED/IS_PAGE_ALIGNED helpers
  KVM: selftests: x86: Execute VMs with private memory
  KVM: selftests: Add get_free_huge_2m_pages
  KVM: selftests: x86: Add selftest for private memory

 arch/x86/kvm/mmu/mmu.c                        |   4 +
 arch/x86/kvm/mmu/mmu_internal.h               |   4 +-
 tools/testing/selftests/kvm/.gitignore        |   1 +
 tools/testing/selftests/kvm/Makefile          |   2 +
 .../selftests/kvm/include/kvm_util_base.h     |  15 +-
 .../testing/selftests/kvm/include/test_util.h |   5 +
 .../kvm/include/x86_64/private_mem.h          |  37 +++
 .../selftests/kvm/include/x86_64/processor.h  |   1 +
 tools/testing/selftests/kvm/lib/kvm_util.c    |  58 ++++-
 tools/testing/selftests/kvm/lib/test_util.c   |  30 +++
 .../selftests/kvm/lib/x86_64/private_mem.c    | 211 ++++++++++++++++++
 .../selftests/kvm/x86_64/private_mem_test.c   | 190 ++++++++++++++++
 virt/kvm/Kconfig                              |   4 +
 virt/kvm/kvm_main.c                           |   2 +-
 14 files changed, 555 insertions(+), 9 deletions(-)
 create mode 100644 tools/testing/selftests/kvm/include/x86_64/private_mem.h
 create mode 100644 tools/testing/selftests/kvm/lib/x86_64/private_mem.c
 create mode 100644 tools/testing/selftests/kvm/x86_64/private_mem_test.c

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2.38.1.431.g37b22c650d-goog