Re: [PATCH] Add a text_poke syscall v2

Oleg Nesterov
2013-11-29T20:05:01Z

On 11/29, Andi Kleen wrote:
>
> > Andi, et al. I am going to discuss the things I do not really
> > understand, probably this can't make any sense, but...
>
> I think it's enough to set the dirty bit in the underlying
> struct page, no need to play games with the PTE.

Ah, sorry for confusion, I guess you misunderstood.

I meant, perhaps sys_text_poke() doesn't the in-kernel text_poke
machinery altogether?

Can't we invalidate pte (so that any user will stuck in page fault),
update the page(s), restore the pte and drop the locks?

This way sys_text_poke() won't be x86-specific, and it will be per-mm.

Oleg.