On Tue, Sep 25, 2018 at 11:15:40AM +0800, Lu Baolu wrote:
> This might be problematic for vt-d (and other possible arch's which use
> PASID other than SVA). When vt-d iommu works in scalable mode, a PASID
> might be allocated for:
>
> (1) SVA
> (2) Device Assignable Interface (might be a mdev or directly managed
> within a device driver).
> (3) SVA in VM guest
> (4) Device Assignable Interface in VM guest
>
> So we can't expect that an io_mm pointer was associated with each PASID.
> And this code might run into problem if the pasid is allocated for
> usages other than SVA.
So all of these use-cases above should work in parallel on the same
device, just with different PASIDs? Or is a device always using only one
of the above modes at the same time?
Regards,
Joerg
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