On Mon, 2019-11-25 at 23:07 +0100, Richard Weinberger wrote: > On Fri, Nov 8, 2019 at 6:03 AM Hajime Tazaki <thehajime@xxxxxxxxx> wrote: > > From: Octavian Purdila <tavi.purdila@xxxxxxxxx> > > > > Add helpers for implementing host virtio devices. It uses the memory > > mapped I/O helpers to interact with the Linux MMIO virtio transport > > driver and offers support to setup and add a new virtio device, > > dispatch requests from the incoming queues as well as support for > > completing requests. > > > > All added virtio devices are stored in lkl_virtio_devs as strings, per > > the Linux MMIO virtio transport driver command line specification. > > Did you checkout arch/um/drivers/virtio_uml.c? > Why is this driver needed? This isn't really a driver, this is virtio *device-side* code. Our virtio_uml is *guest-side* code, and only speaks vhost-user. I'm not sure how MMIO devices could possibly work though, does LKL intercept MMIO somehow? johannes
