Re: [RFC] KVM MMU: thinking of shadow page cache

[Avi Kivity]

On 04/01/2010 12:05 PM, Xiao Guangrong wrote:
> > We've considered this in the past, it makes sense.  The big question is
> > whether any guests actually map the same page table through PDEs with
> > different permissions (mapping the same page table through multiple PDEs
> > is very common, but always with the same permissions).  Do you know of
> > any such guest?
> >      
> I also don't know whether have such guest.
> Maybe my idea is no good for current OS, thanks for your comments.
>    

In fact there are plans to make kvm such a guest (when running in nested 
mode) - when we perform live migration we write-protect all guest pages, 
and it's reasonable to use the top-level shadow page to write protect 
all memory at once instead of iterating over all mmu pages.  When that 
goes in, we should also implement your idea.

--
error compiling committee.c: too many arguments to function

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