On Mon, Dec 04, 2023 at 10:48:50AM -0400, Jason Gunthorpe wrote: > > Or am I missing some point here? > > It sounds Ok, we just have to understand what userspace should be > doing and how much of this the kernel should implement. > > It seems to me that the error code should return the gerror and the > req_num should indicate the halted cons. The vmm should relay both > into the virtual registers. I see your concern. I will take a closer look and see if we can add to the initial version of arm_smmu_cache_invalidate_user(). Otherwise, we can add later. Btw, VT-d seems to want the error_code and reports in the VT-d specific invalidate entry structure, as Kevin and Yi had that discussion in the other side of the thread. Thanks Nicolin
