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

[Kirill A. Shutemov]

On Mon, Feb 21, 2022 at 02:37:29PM +0300, Cyrill Gorcunov wrote:
> 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;

Sure. Will do.

-- 
 Kirill A. Shutemov