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

[H. Peter Anvin]

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
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