en Copyright 2015 Java http://kernelsources.org:8080/source/history/linux/tools/testing/selftests/kvm/x86/nested_tdp_fault_test.c#0de1020f7bbb3e1c9cd5b6f3eb4bdd661b1ff735 KVM: selftests: Add nested page fault injection testAdd a test that exercises nested page fault injection during L2execution. L2 executes I/O string instructions (OUTSB/INSB) that accessmemory restricted in L1's nested page tables (NPT/EPT), triggering anested page fault that L0 must inject to L1.The test supports both AMD SVM (NPF) and Intel VMX (EPT violation) andverifies that: - The exit reason is an NPF/EPT violation - The access type and permission bits are correct - The faulting GPA is correctThree test cases are implemented: - Unmap the final data page (final translation fault, OUTSB read) - Unmap a PT page (page walk fault, OUTSB read) - Write-protect the final data page (protection violation, INSB write) - Write-protect a PT page (protection violation on A/D update, OUTSB read)Signed-off-by: Kevin Cheng <chengkev@google.com>[sean: name it nested_tdp_fault_test, consolidate asserts]Link: https://patch.msgid.link/20260522232701.3671446-6-seanjc@google.comSigned-off-by: Sean Christopherson <seanjc@google.com> List of files: /linux/tools/testing/selftests/kvm/x86/nested_tdp_fault_test.c Sat, 23 May 2026 01:27:01 +0200 Kevin Cheng <chengkev@google.com>