Message-ID: <4544714F.7070203@qumranet.com>
Date: Sun, 29 Oct 2006 11:15:59 +0200
From: Avi Kivity <avi@qumranet.com>
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To: Anthony Liguori <aliguori@us.ibm.com>
CC: Arnd Bergmann <arnd@arndb.de>, kvm-devel@lists.sourceforge.net,
       linux-kernel@vger.kernel.org
Subject: Re: [kvm-devel] [PATCH 6/13] KVM: memory slot management
References: <4540EE2B.9020606@qumranet.com> <200610270044.31382.arnd@arndb.de>	<45419D73.1070106@qumranet.com> <200610270937.11646.arnd@arndb.de> <454208EB.7080007@qumranet.com> <4542292C.3080409@us.ibm.com>
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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).

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

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