Re: [PATCH v7 9/9] x86/startup_64: Drop global variables keeping track of LA57 state

[Borislav Petkov]

On Tue, Feb 27, 2024 at 04:19:17PM +0100, Ard Biesheuvel wrote:
> +	asm(ALTERNATIVE_TERNARY(
> +		"movq %%cr4, %[reg] \n\t btl %[la57], %k[reg]" CC_SET(c),
> +		%P[feat], "stc", "clc")
> +		: [reg] "=&r" (r), CC_OUT(c) (ret)
> +		: [feat] "i"  (X86_FEATURE_LA57),
> +		  [la57] "i"  (X86_CR4_LA57_BIT)
> +		: "cc");
> +
> +	return ret;

Yeah, I said this is creative but an alternative here looks like an
overkill.

Can we use a RIP_REL_REF(global var) instead pls?

Thx.

-- 
Regards/Gruss,
    Boris.

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