Re: [kvm-devel] KVM swapping with mmu notifiers

[Avi K. <av...@qu...>]

Andrea Arcangeli wrote:
>>
>> Aren't mmu notifiers called with mmap_sem held for read?
>>
>> Maybe not from the swap path?
>>     
>
> Good point, the swap path isn't covered by the mmap_sem, so Marcelo's
> right I need to fixup the locking a bit.
>   

One idea I had at a time was to add ->lock() and ->unlock() callbacks to 
mmu notifiers that would be called in a sleepy context.  But that seems 
heavy handed.  Maybe it can be fixed in some clever way with rcu or with 
a rwlock around the memory slot map.

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