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SubjectRe: [PATCH v8 1/1] selftests/x86/xstate: Add xstate test cases for XSAVE feature
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On 3/16/2022 5:40 AM, Pengfei Xu wrote:
>
> +static inline void check_cpuid_xsave_availability(void)
> +{
> + uint32_t eax, ebx, ecx, edx;
> +
> + /*
> + * CPUID.1:ECX.XSAVE[bit 26] enumerates general
> + * support for the XSAVE feature set, including
> + * XGETBV.
> + */
> + __cpuid_count(1, 0, eax, ebx, ecx, edx);
> + if (!(ecx & CPUID_LEAF1_ECX_XSAVE_MASK))
> + fatal_error("cpuid: no CPU xsave support");
> + if (!(ecx & CPUID_LEAF1_ECX_OSXSAVE_MASK))
> + fatal_error("cpuid: no OS xsave support");

We need to skip the test when XSAVE is not available. See the point
here: https://lore.kernel.org/lkml/8735j8aa9g.ffs@tglx/

Thanks,
Chang


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