Re: [Xen-devel] [PATCH v12 2/6] vt-d: synchronize for Device-TLB flush one by one

["Tian, Kevin" <kevin.tian@xxxxxxxxx>]

> From: Xu, Quan
> Sent: Friday, June 24, 2016 1:52 PM
> 
> From: Quan Xu <quan.xu@xxxxxxxxx>
> 
> Today we do Device-TLB flush synchronization after issuing flush
> requests for all ATS devices belonging to a VM. Doing so however
> imposes a limitation, i.e. that we can not figure out which flush
> request is blocked in the flush queue list, based on VT-d spec.
> 
> To prepare correct Device-TLB flush timeout handling in next patch,
> we change the behavior to synchronize for every Device-TLB flush
> request. So the Device-TLB flush interface is changed a little bit,
> by checking timeout within the function instead of outside of function.
> 
> Accordingly we also do a similar change for flush interfaces of
> IOTLB/IEC/Context, i.e. moving synchronization into the function.
> Since there is no user of a non-synced interface, we just rename
> existing ones with _sync suffix.
> 
> Signed-off-by: Quan Xu <quan.xu@xxxxxxxxx>
> Reviewed-by: Jan Beulich <jbeulich@xxxxxxxx>
> 

Acked-by: Kevin Tian <kevin.tian@xxxxxxxxx>

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