Hi Joerg, On 09/25/2018 09:26 PM, Joerg Roedel wrote:
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?
No. It's not required.
Or is a device always using only one of the above modes at the same time?
A device might use one or multiple modes described above at the same time. Best regards, Lu Baolu
