On Mon, Aug 12, 2019 at 02:13:24PM +0200, Christoph Hellwig wrote: > On Sat, Aug 10, 2019 at 11:46:21PM -0700, Ram Pai wrote: > > If the hypervisor (hardware for hw virtio devices) does not mandate a > > DMA API, why is it illegal for the driver to request, special handling > > of its i/o buffers? Why are we associating this special handling to > > always mean, some DMA address translation? Can't there be > > any other kind of special handling needs, that has nothing to do with > > DMA address translation? > > I don't think it is illegal per se. It is however completely broken > if we do that decision on a system weide scale rather than properly > requesting it through a per-device flag in the normal virtio framework. if the decision has to be system-wide; for reasons known locally only to the kernel/driver, something that is independent of any device-flag, what would be the mechanism? RP _______________________________________________ Virtualization mailing list Virtualization@xxxxxxxxxxxxxxxxxxxxxxxxxx https://lists.linuxfoundation.org/mailman/listinfo/virtualization
