Re: [patch 2/2] x86 NMI-safe INT3 and Page Fault

H. Peter Anvin
2010-07-16T18:19:21Z

On 07/16/2010 11:15 AM, Avi Kivity wrote:
>
> There aren't that many processes at this time (or there shouldn't be,
> don't know how fork-happy udev is at this stage), so the sync should be
> pretty fast. In any case, we can sync only modules that contain NMI
> handlers.
>
>> I really hope noone ever gets the idea of touching user space from an
>> NMI handler, though, and expecting it to work...
>>
>
> I think the concern here is about an NMI handler's code running in
> vmalloc space, or is it something else?
>

Code or data, yes; including percpu data.

-hpa