Re: [Xen-devel] [PATCH V2 24/25] x86/vvtd: Add queued invalidation (QI) support

[Lan Tianyu <tianyu.lan@xxxxxxxxx>]

On 2017年08月23日 20:16, Roger Pau Monné wrote:
> On Wed, Aug 09, 2017 at 04:34:25PM -0400, Lan Tianyu wrote:
>> > From: Chao Gao <chao.gao@xxxxxxxxx>
>> > 
>> > Queued Invalidation Interface is an expanded invalidation interface with
>> > extended capabilities. Hardware implementations report support for queued
>> > invalidation interface through the Extended Capability Register. The queued
>> > invalidation interface uses an Invalidation Queue (IQ), which is a circular
>> > buffer in system memory. Software submits commands by writing Invalidation
>> > Descriptors to the IQ.
>> > 
>> > In this patch, a new function viommu_process_iq() is used for emulating how
>> > hardware handles invalidation requests through QI.
> It seems like this is an extended feature, which is not needed for
> basic functionality. Would it be possible to have this series focus on
> the bare-minimum functionality, leaving everything else to a separate
> series?
> 

No, IOMMU supporting interrupt remapping must also support Queued
Invalidation (QI) according VTD spec.

-- 
Best regards
Tianyu Lan

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