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

[Andi Kleen]

> I think it is cleaner to switch to IRET here. Does this work for you?
> 
> diff --git a/arch/x86/realmode/rm/trampoline_64.S b/arch/x86/realmode/rm/trampoline_64.S
> index 608f108cba7d..14d9c7daf90f 100644
> --- a/arch/x86/realmode/rm/trampoline_64.S
> +++ b/arch/x86/realmode/rm/trampoline_64.S
> @@ -243,7 +243,9 @@ SYM_CODE_START(trampoline_start64)
>  	movl	$pa_trampoline_pgd, %eax
>  	movq	%rax, %cr3
>  
> -	jmpq	*tr_start(%rip)
> +	pushq	$__KERNEL_CS
> +	pushq	tr_start(%rip)
> +	lretq

Looks good. Thanks.

-Andi