Re: [PATCH v8 1/1] selftests/x86/xstate: Add xstate test cases for XSAVE feature

[Chang S. Bae]

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