On Mon, Oct 26, 2020 at 09:26:37AM -0300, Jason Gunthorpe wrote: > On Sat, Oct 24, 2020 at 08:48:07AM +0100, Christoph Hellwig wrote: > > On Fri, Oct 23, 2020 at 03:20:05PM -0300, Jason Gunthorpe wrote: > > > The problem is we have RDMA drivers that assume SGL's have a valid > > > struct page, and these hacky/wrong P2P sgls that DMABUF creates cannot > > > be passed into those drivers. > > > > RDMA drivers do not assume scatterlist have a valid struct page, > > scatterlists are defined to have a valid struct page. Any scatterlist > > without a struct page is completely buggy. > > It is not just having the struct page, it needs to be a CPU accessible > one for memcpy/etc. They aren't correct with the > MEMORY_DEVICE_PCI_P2PDMA SGLs either. Exactly.
