Re: [PATCHv3, RESEND] x86/trampoline: Bypass compat mode in trampoline_start64() if not needed

[Andi Kleen]

> +	/* Paging mode is correct proceed in 64-bit mode */
> +
> +	LOCK_AND_LOAD_REALMODE_ESP lock_rip=1
> +
> +	movw	$__KERNEL_DS, %dx
> +	movl	%edx, %ss
> +	addl	$pa_real_mode_base, %esp
> +	movl	%edx, %ds
> +	movl	%edx, %es
> +	movl	%edx, %fs
> +	movl	%edx, %gs
> +
> +	movl	$pa_trampoline_pgd, %eax
> +	movq	%rax, %cr3
> +
> +	jmpq	*tr_start(%rip)

Still think we should add a far jump here so that we run on a defined
code segment. It probably doesn't matter since there are likely no
IRETs before reloading anyways, but it seems cleaner.

-Andi