From mboxrd@z Thu Jan  1 00:00:00 1970
From: Malcolm Crossley <malcolm.crossley@citrix.com>
Subject: Re: One question about the hypercall to translate gfn
 to mfn.
Date: Tue, 9 Dec 2014 11:28:22 +0000
Message-ID: <5486DCD6.5000302@citrix.com>
References: <5486CAAF.9070807@linux.intel.com>	<20141209104633.GC75319@deinos.phlegethon.org>	<9AAE0902D5BC7E449B7C8E4E778ABCD025785885@AMSPEX01CL01.citrite.net>	<1418123464.14361.19.camel@citrix.com>	<9AAE0902D5BC7E449B7C8E4E778ABCD025785926@AMSPEX01CL01.citrite.net>
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On 09/12/14 11:23, Jan Beulich wrote:
>>>> On 09.12.14 at 12:17, <Paul.Durrant@citrix.com> wrote:
>> I think we want be able to avoid setting up a PTE in the MMU since it's not 
>> needed in most (or perhaps all?) cases.
> 
> With shared page tables, there's no way to do one without the other.
> 
Interestingly the IOMMU in front of the Intel GPU is only capable of
handling 4k pages and so we wouldn't end up with share page tables being
used.

For other PCI device's then shared page tables will be a problem.

Malcolm

> Jan
> 
> 
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