This series implements selftests targeting the feature floated by Chao via: https://lore.kernel.org/linux-mm/20221109041358.GA118963@chaop.bj.intel.com/...
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@google.com/...
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