Re: [PATCH 6/13] KVM: memory slot management

[Avi Kivity <avi-atKUWr5tajBWk0Htik3J/w@public.gmane.org>]

Anthony Liguori wrote:
>>
>> It's not about tlb entries.  The shadow page tables collaples a GV -> 
>> HV -> HP  double translation into a GV -> HP page table.  When the 
>> Linux vm goes around evicting pages, it invalidates those mappings.
>>
>> There are two solutions possible: lock pages which participate in 
>> these translations (and their number can be large) or modify the 
>> Linux vm to consult a reverse mapping and remove the translations (in 
>> which case TLB entries need to be removed).
>>   
>
> If you locked pages that have active shadow mappings, you could then 
> use a secondary mechanism to invalidate existing mappings when necessary.
>

Yes.

There are two needs: to propagate virtual machine activity to the host 
(by folding dirty and accessed bits from multiple shadow ptes into a 
single struct page), and to apply pressure from the vm to the guest (by 
invalidating all mappings of a given page).

-- 
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