Messages in this thread | | | Date | Mon, 1 Feb 2021 19:44:24 -0400 | From | Jason Gunthorpe <> | Subject | Re: [RFC PATCH v2] uacce: Add uacce_ctrl misc device |
| |
On Fri, Jan 29, 2021 at 10:09:03AM +0000, Tian, Kevin wrote: > > SVA is not doom to work with IO page fault only. If we have SVA+pin, > > we would get both sharing address and stable I/O latency. > > Isn't it like a traditional MAP_DMA API (imply pinning) plus specifying > cpu_va of the memory pool as the iova?
I think their issue is the HW can't do the cpu_va trick without also involving the system IOMMU in a SVA mode
It really is something that belongs under some general /dev/sva as we talked on the vfio thread
Jason
| |