Re: [PATCH] x86_64 paravirt_ops port

[Chris Wright <chrisw@sous-sol.org>]

* Glauber de Oliveira Costa (gcosta@redhat.com) wrote:
> I've been working on a port of paravirt_ops for the x86_64 architectures
> for a couple of days. Here's the result so far. I'm posting it soon for
> early cooments. The more, the better.

Thanks a lot for getting this started Glauber.  As Rusty mentioned,
we'll want to follow the no export paravirt_ops motion upstream
for x86_64 as well.

> Index: linux-2.6.19-quilt/arch/x86_64/kernel/entry.S
> ===================================================================
> --- linux-2.6.19-quilt.orig/arch/x86_64/kernel/entry.S
> +++ linux-2.6.19-quilt/arch/x86_64/kernel/entry.S
> @@ -1064,6 +1064,22 @@ KPROBE_ENTRY(int3)
>   	CFI_ENDPROC
>  KPROBE_END(int3)
>  
> +#ifdef CONFIG_PARAVIRT
> +ENTRY(native_iret)
> +1:	iretq
> +.section __ex_table,"a"
> +	.align 8
> +	.quad 1b, bad_iret
> +.previous
> +ENDPROC(native_iret)
> +
> +ENTRY(native_irq_enable_sysexit)
> +	sti
> +	sysretq
> +ENDPROC(native_irq_enable_sysexit)

sysexit is legacy mode only

and I think we'll need a story for swapgs