lwn.git/tools/testing/selftests/kvm/include/x86/vmx.h, branch master

KVM: selftests: Use u8 instead of uint8_t

2026-04-20T21:54:17+00:00

Use u8 instead of uint8_t to make the KVM selftests code more concise and more similar to the kernel (since selftests are primarily developed by kernel developers). This commit was generated with the following command: git ls-files tools/testing/selftests/kvm | xargs sed -i 's/uint8_t/u8/g' Then by manually adjusting whitespace to make checkpatch.pl happy. No functional change intended. Signed-off-by: David Matlack Link: https://patch.msgid.link/20260420212004.3938325-11-seanjc@google.com Signed-off-by: Sean Christopherson

KVM: selftests: Use u32 instead of uint32_t

2026-04-20T21:54:16+00:00

Use u32 instead of uint32_t to make the KVM selftests code more concise and more similar to the kernel (since selftests are primarily developed by kernel developers). This commit was generated with the following command: git ls-files tools/testing/selftests/kvm | xargs sed -i 's/uint32_t/u32/g' Then by manually adjusting whitespace to make checkpatch.pl happy. No functional change intended. Signed-off-by: David Matlack Link: https://patch.msgid.link/20260420212004.3938325-7-seanjc@google.com Signed-off-by: Sean Christopherson

KVM: selftests: Use u64 instead of uint64_t

2026-04-20T21:54:16+00:00

Use u64 instead of uint64_t to make the KVM selftests code more concise and more similar to the kernel (since selftests are primarily developed by kernel developers). This commit was generated with the following command: git ls-files tools/testing/selftests/kvm | xargs sed -i 's/uint64_t/u64/g' Then by manually adjusting whitespace to make checkpatch.pl happy. Include in include/kvm_util_types.h, iinclude/test_util.h, and include/x86/pmu.h to pick up the tools-defined u64. Arguably, all headers (especially kvm_util_types.h) should have already been including stdint.h to get uint64_t from the libc headers, but the missing dependency only rears its head once KVM uses u64 instead of uint64_t. No functional change intended. Signed-off-by: David Matlack [sean: rename pread_uint64() => pread_u64, expand on types.h include] Link: https://patch.msgid.link/20260420212004.3938325-5-seanjc@google.com Signed-off-by: Sean Christopherson

KVM: selftests: Use gva_t instead of vm_vaddr_t

2026-04-20T21:54:16+00:00

Replace all occurrences of vm_vaddr_t with gva_t to align with KVM code and with the conversion helpers (e.g. addr_gva2hva()). This commit was generated with the following command: git ls-files tools/testing/selftests/kvm | xargs sed -i 's/vm_vaddr_/gva_/g' Then by manually adjusting whitespace to make checkpatch.pl happy, and dropping renames of functions that allocate memory within a given VM. No functional change intended. Signed-off-by: David Matlack [sean: drop renames of allocator APIs] Link: https://patch.msgid.link/20260420212004.3938325-2-seanjc@google.com Signed-off-by: Sean Christopherson

KVM: selftests: Move TDP mapping functions outside of vmx.c

2026-01-08T20:02:13+00:00

Now that the functions are no longer VMX-specific, move them to processor.c. Do a minor comment tweak replacing 'EPT' with 'TDP'. No functional change intended. Signed-off-by: Yosry Ahmed Link: https://patch.msgid.link/20251230230150.4150236-15-seanjc@google.com Signed-off-by: Sean Christopherson

KVM: selftests: Stop passing VMX metadata to TDP mapping functions

2026-01-08T20:02:11+00:00

The root GPA is now retrieved from the nested MMU, stop passing VMX metadata. This is in preparation for making these functions work for NPTs as well. Opportunistically drop tdp_pg_map() since it's unused. No functional change intended. Signed-off-by: Yosry Ahmed Link: https://patch.msgid.link/20251230230150.4150236-12-seanjc@google.com Signed-off-by: Sean Christopherson

KVM: selftests: Use a TDP MMU to share EPT page tables between vCPUs

2026-01-08T20:02:10+00:00

prepare_eptp() currently allocates new EPTs for each vCPU. memstress has its own hack to share the EPTs between vCPUs. Currently, there is no reason to have separate EPTs for each vCPU, and the complexity is significant. The only reason it doesn't matter now is because memstress is the only user with multiple vCPUs. Add vm_enable_ept() to allocate EPT page tables for an entire VM, and use it everywhere to replace prepare_eptp(). Drop 'eptp' and 'eptp_hva' from 'struct vmx_pages' as they serve no purpose (e.g. the EPTP can be built from the PGD), but keep 'eptp_gpa' so that the MMU structure doesn't need to be passed in along with vmx_pages. Dynamically allocate the TDP MMU structure to avoid a cyclical dependency between kvm_util_arch.h and kvm_util.h. Remove the workaround in memstress to copy the EPT root between vCPUs since that's now the default behavior. Name the MMU tdp_mmu instead of e.g. nested_mmu or nested.mmu to avoid recreating the same mess that KVM has with respect to "nested" MMUs, e.g. does nested refer to the stage-2 page tables created by L1, or the stage-1 page tables created by L2? Signed-off-by: Yosry Ahmed Co-developed-by: Sean Christopherson Link: https://patch.msgid.link/20251230230150.4150236-11-seanjc@google.com Signed-off-by: Sean Christopherson

KVM: selftests: Rename nested TDP mapping functions

2026-01-08T20:02:06+00:00

Rename the functions from nested_* to tdp_* to make their purpose clearer. No functional change intended. Suggested-by: Sean Christopherson Signed-off-by: Yosry Ahmed Link: https://patch.msgid.link/20251230230150.4150236-4-seanjc@google.com Signed-off-by: Sean Christopherson

KVM: selftests: Stop passing a memslot to nested_map_memslot()

2026-01-08T20:02:05+00:00

On x86, KVM selftests use memslot 0 for all the default regions used by the test infrastructure. This is an implementation detail. nested_map_memslot() is currently used to map the default regions by explicitly passing slot 0, which leaks the library implementation into the caller. Rename the function to a very verbose nested_identity_map_default_memslots() to reflect what it actually does. Add an assertion that only memslot 0 is being used so that the implementation does not change from under us. No functional change intended. Signed-off-by: Yosry Ahmed Link: https://patch.msgid.link/20251230230150.4150236-3-seanjc@google.com Signed-off-by: Sean Christopherson

KVM: selftests: Remove the unused argument to prepare_eptp()

2025-11-21T00:19:57+00:00

eptp_memslot is unused, remove it. No functional change intended. Signed-off-by: Yosry Ahmed Link: https://patch.msgid.link/20251021074736.1324328-10-yosry.ahmed@linux.dev Signed-off-by: Sean Christopherson