Re: [PATCH v2 06/27] x86/entry/64: Adapt assembly for PIE support

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On Tue, Mar 13, 2018 at 01:59:24PM -0700, Thomas Garnier wrote:
> @@ -1576,7 +1578,9 @@ first_nmi:
>  	addq	$8, (%rsp)	/* Fix up RSP */
>  	pushfq			/* RFLAGS */
>  	pushq	$__KERNEL_CS	/* CS */
> -	pushq	$1f		/* RIP */
> +	pushq	%rax		/* Support Position Independent Code */
> +	leaq	1f(%rip), %rax	/* RIP */
> +	xchgq	%rax, (%rsp)	/* Restore RAX, put 1f */
>  	iretq			/* continues at repeat_nmi below */
>  	UNWIND_HINT_IRET_REGS
>  1:

Urgh, xchg with a memop has an implicit LOCK prefix.
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