On Wed, Jul 30, 2025 at 4:29 AM Viresh Kumar <viresh.kumar@xxxxxxxxxx> wrote: > > Hello, > > This RFC series introduces support for a new Virtio transport type: > "virtio-msg", as proposed in [1]. Unlike existing transport types like > virtio-mmio or virtio-pci, which rely on memory-mapped registers, virtio-msg > implements transport operations via structured messages. Those messages can be > transported through different mechanisms such as mailboxes, shared memory based > FIFO or specific protocols such as FF-A on Arm. > > This series includes: > - Core virtio-msg transport support. > - Two message transport bus implementations: > - virtio-msg-ffa: based on ARM's Firmware Framework for Arm (FF-A). > - virtio-msg-loopback: a loopback device for testing and validation. > > The code is available here for reference: [2] and virtio-msg loopback and FF-A > test setups are explained here: [3] and [4]. > > This series is based on v6.16 and depends on commit [5]. > > > ### Memory Mapping and Reserved Memory Usage > > The first two patches enhance the reserved-memory subsystem to support attaching > struct device`s that do not originate from DT nodes — essential for virtual or > dynamically discovered devices like the FF-A or loopback buses. We support creating devices from reserved-memory nodes. Just add a compatible which you should do anyways because node names are not supposed to be that specific or an ABI. Rob
