diff options
| -rw-r--r-- | tools/testing/selftests/x86/xstate.c | 24 |
1 files changed, 24 insertions, 0 deletions
diff --git a/tools/testing/selftests/x86/xstate.c b/tools/testing/selftests/x86/xstate.c index fd8451e55f3f..875777911d82 100644 --- a/tools/testing/selftests/x86/xstate.c +++ b/tools/testing/selftests/x86/xstate.c @@ -15,6 +15,24 @@ #include "helpers.h" #include "xstate.h" +/* + * The userspace xstate test suite is designed to be generic and operates + * with randomized xstate data. However, some states require special handling: + * + * - PKRU and XTILECFG need specific adjustments, such as modifying + * randomization behavior or using fixed values. + * - But, PKRU already has a dedicated test suite in /tools/selftests/mm. + * - Legacy states (FP and SSE) are excluded, as they are not considered + * part of extended states (xstates) and their usage is already deeply + * integrated into user-space libraries. + */ +#define XFEATURE_MASK_TEST_SUPPORTED \ + ((1 << XFEATURE_YMM) | \ + (1 << XFEATURE_OPMASK) | \ + (1 << XFEATURE_ZMM_Hi256) | \ + (1 << XFEATURE_Hi16_ZMM) | \ + (1 << XFEATURE_XTILEDATA)) + static inline uint64_t xgetbv(uint32_t index) { uint32_t eax, edx; @@ -435,6 +453,12 @@ void test_xstate(uint32_t feature_num) unsigned long features; long rc; + if (!(XFEATURE_MASK_TEST_SUPPORTED & (1 << feature_num))) { + ksft_print_msg("The xstate test does not fully support the component %u, yet.\n", + feature_num); + return; + } + rc = syscall(SYS_arch_prctl, ARCH_GET_XCOMP_SUPP, &features); if (rc || !(features & (1 << feature_num))) { ksft_print_msg("The kernel does not support feature number: %u\n", feature_num); |