Re: [Xen-devel] [PATCH v6 08/14] vtd: add lookup_page method to iommu_ops

["Jan Beulich" <JBeulich@xxxxxxxx>]

>>> On 07.09.18 at 14:36, <Paul.Durrant@xxxxxxxxxx> wrote:
>>  -----Original Message-----
>> From: Jan Beulich [mailto:JBeulich@xxxxxxxx]
>> Sent: 07 September 2018 12:11
>> To: Paul Durrant <Paul.Durrant@xxxxxxxxxx>
>> Cc: George Dunlap <George.Dunlap@xxxxxxxxxx>; Kevin Tian
>> <kevin.tian@xxxxxxxxx>; xen-devel <xen-devel@xxxxxxxxxxxxxxxxxxxx>
>> Subject: Re: [PATCH v6 08/14] vtd: add lookup_page method to iommu_ops
>> 
>> >>> On 23.08.18 at 11:47, <paul.durrant@xxxxxxxxxx> wrote:
>> > This patch adds a new method to the VT-d IOMMU implementation to find
>> the
>> > MFN currently mapped by the specified BFN along with a wrapper function
>> in
>> > generic IOMMU code to call the implementation if it exists.
>> 
>> For this to go in, I think the AMD side of it wants to also be implemented.
> 
> Why? It can be done later. Nothing existing is going to break if it is not 
> implemented.

If it was something that's terribly difficult to implement, I'd
probably agree. But introducing PV IOMMU for Intel only (and
hence once again making AMD a second class citizen) I don't
really like. Another thing would be if you had the implementation
ready, but the maintainer(s) don't respond...

Jan



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