Re: [Xen-devel] [PATCH v8 7/7] vtd: add lookup_page method to iommu_ops

["Jan Beulich" <JBeulich@xxxxxxxx>]

>>> On 13.09.18 at 16:04, <Paul.Durrant@xxxxxxxxxx> wrote:
>>  -----Original Message-----
>> From: Jan Beulich [mailto:JBeulich@xxxxxxxx]
>> Sent: 13 September 2018 14:57
>> To: Paul Durrant <Paul.Durrant@xxxxxxxxxx>
>> Cc: George Dunlap <George.Dunlap@xxxxxxxxxx>; Wei Liu
>> <wei.liu2@xxxxxxxxxx>; Kevin Tian <kevin.tian@xxxxxxxxx>; xen-devel <xen-
>> devel@xxxxxxxxxxxxxxxxxxxx>
>> Subject: RE: [PATCH v8 7/7] vtd: add lookup_page method to iommu_ops
>> 
>> >>> On 13.09.18 at 15:50, <Paul.Durrant@xxxxxxxxxx> wrote:
>> > Ok. I'll spell it out in the header if you think it is non-obvious.
>> 
>> Obvious or not - do we _have_ any such outer locking in place right now?
>> 
> 
> Yes. The locking is either via the P2M or grant table locks for all current 
> uses or map and unmap that I can see.

But two different locks still means no guarantees at all.

Jan



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