Re: [PATCHv3 13/32] x86/tdx: Detect TDX at early kernel decompression time

[Cyrill Gorcunov]

On Fri, Feb 18, 2022 at 07:16:59PM +0300, Kirill A. Shutemov wrote:
...
> 
> +
> +void early_tdx_detect(void)
> +{
> +	u32 eax, sig[3];
> +
> +	cpuid_count(TDX_CPUID_LEAF_ID, 0, &eax, &sig[0], &sig[2],  &sig[1]);
> +
> +	if (memcmp(TDX_IDENT, sig, 12))
> +		return;

Maybe worth to guard ourself, like

	BUILD_BUG_ON(sizeof(sig) != (sizeof(TDX_IDENT)-1));
	if (memcmp(TDX_IDENT, sig, sizeof(sig))
		return;