linux-next.git/tools/testing/selftests/kvm/include/test_util.h, branch master

KVM: selftests: Add helper to generate random u64 in range [min,max]

2026-07-07T18:24:43+00:00

Introduce kvm_random_u64_in_range(state, min, max). This function returns a random u64 in the inclusive range of [min, max] using a struct kvm_random_state. Suggested-by: Sean Christopherson Signed-off-by: Josh Hilke Link: https://patch.msgid.link/20260626213534.3866178-7-seanjc@google.com Signed-off-by: Sean Christopherson

KVM: selftests: Rename guest_rng to kvm_rng

2026-07-07T18:24:43+00:00

Rename functions prefixed with 'guest_random_' to 'kvm_random_' and the global random state variable 'guest_rng' to 'kvm_rng', as the pRNG isn't strictly limited to guest code. This will allow using the pRNG in host code without creating confusing/misleading function calls. No functional changes are intended. Suggested-by: Sean Christopherson Signed-off-by: Josh Hilke [sean: massage changelog] Link: https://patch.msgid.link/20260626213534.3866178-4-seanjc@google.com Signed-off-by: Sean Christopherson

KVM: selftests: Include sys/mman.h and linux/mman.h, via kvm_syscalls.h

2026-05-13T16:53:43+00:00

Include both linux/mman.h (the kernel provided version) and sys/mman.h (the libc provided version) throughout KVM selftests, by way of kvm_syscalls.h (which should have been including sys/mman.h anyways). Pulling in the kernel's version fixes compilation errors with the guest_memfd test on older versions of libc due to a recent commit adding MADV_COLLAPSE testing. In file included from include/kvm_util.h:8, from guest_memfd_test.c:21: guest_memfd_test.c: In function ‘test_collapse’: guest_memfd_test.c:219:47: error: ‘MADV_COLLAPSE’ undeclared (first use in this function); did you mean ‘MADV_COLD’? 219 | TEST_ASSERT_EQ(madvise(mem, pmd_size, MADV_COLLAPSE), -1); | ^~~~~~~~~~~~~ include/test_util.h:62:16: note: in definition of macro ‘TEST_ASSERT_EQ’ 62 | typeof(a) __a = (a); \ | ^ guest_memfd_test.c:219:47: note: each undeclared identifier is reported only once for each function it appears in 219 | TEST_ASSERT_EQ(madvise(mem, pmd_size, MADV_COLLAPSE), -1); | ^~~~~~~~~~~~~ include/test_util.h:62:16: note: in definition of macro ‘TEST_ASSERT_EQ’ 62 | typeof(a) __a = (a); \ | ^ Route the includes through kvm_syscalls.h to try and avoid a future game of whack-a-mole, i.e. so that future expansion of test coverage doesn't run into the same problem. To discourage use of sys/mman.h, opportunistically include the kernel's version of mman.h in test_util.h as it only needs MAP_SHARED, i.e. only needs the full set of kernel defs, not the libc syscall wrappers. Fixes: 9830209b4ae8 ("KVM: selftests: Test MADV_COLLAPSE on guest_memfd") Reported-by: Rick Edgecombe Closes: https://lore.kernel.org/all/20260427204313.50741-1-rick.p.edgecombe@intel.com Link: https://patch.msgid.link/20260428012503.1213654-1-seanjc@google.com Signed-off-by: Sean Christopherson

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 s64 instead of int64_t

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

Use s64 instead of int64_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/int64_t/s64/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/20260420212004.3938325-6-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: Add wrapper macro to handle and assert on expected SIGBUS

2025-10-10T21:25:29+00:00

Extract the guest_memfd test's SIGBUS handling functionality into a common TEST_EXPECT_SIGBUS() macro in anticipation of adding more SIGBUS testcases. Eating a SIGBUS isn't terrible difficult, but it requires a non-trivial amount of boilerplate code, and using a macro allows selftests to print out the exact action that failed to generate a SIGBUS without the developer needing to remember to add a useful error message. Explicitly mark the SIGBUS handler as "used", as gcc-14 at least likes to discard the function before linking. Opportunistically use TEST_FAIL(...) instead of TEST_ASSERT(false, ...), and fix the write path of the guest_memfd test to use the local "val" instead of hardcoding the literal value a second time. Suggested-by: Ackerley Tng Reviewed-by: Ackerley Tng Tested-by: Ackerley Tng Reviewed-by: Lisa Wang Tested-by: Lisa Wang Link: https://lore.kernel.org/r/20251003232606.4070510-12-seanjc@google.com Signed-off-by: Sean Christopherson

KVM: selftests: access_tracking_perf_test: Add option to skip the sanity check

2025-05-16T18:45:12+00:00

Add an option to skip sanity check of number of still idle pages, and set it by default to skip, in case hypervisor or NUMA balancing is detected. Signed-off-by: Maxim Levitsky Co-developed-by: James Houghton Signed-off-by: James Houghton Reviewed-by: Maxim Levitsky Link: https://lore.kernel.org/r/20250508184649.2576210-3-jthoughton@google.com Signed-off-by: Sean Christopherson

KVM: selftests: Add printf attribute to _no_printf()

2025-01-08T20:56:31+00:00

Annotate the KVM selftests' _no_printf() with the printf format attribute so that the compiler can help check parameters provided to pr_debug() and pr_info() irrespective of DEBUG and QUIET being defined. [reinette: move attribute right after storage class, rework changelog] Signed-off-by: Isaku Yamahata Signed-off-by: Reinette Chatre Link: https://lore.kernel.org/r/898ec01580f6f4af5655805863239d6dce0d3fb3.1734128510.git.reinette.chatre@intel.com Signed-off-by: Sean Christopherson

linux-next.git/tools/testing/selftests/kvm/include/test_util.h, branch master

KVM: selftests: Add helper to generate random u64 in range [min,max]

KVM: selftests: Rename guest_rng to kvm_rng

KVM: selftests: Include sys/mman.h *and* linux/mman.h, via kvm_syscalls.h

KVM: selftests: Use u8 instead of uint8_t

KVM: selftests: Use u32 instead of uint32_t

KVM: selftests: Use s64 instead of int64_t

KVM: selftests: Use u64 instead of uint64_t

KVM: selftests: Add wrapper macro to handle and assert on expected SIGBUS

KVM: selftests: access_tracking_perf_test: Add option to skip the sanity check

KVM: selftests: Add printf attribute to _no_printf()

KVM: selftests: Include sys/mman.h and linux/mman.h, via kvm_syscalls.h