Re: [PATCH RFC v2 1/1] virtio-msg: Add virtio-msg, a message based virtio transport layer

On Mon, Sep 1, 2025 at 11:37 AM Alex Bennée <[email protected]> wrote:
>
> Bill Mills <[email protected]> writes:
>
> > Add a new transport layer that is based on messages.
> >
> > This transport layer still uses virtqueues as the other transport layers do
> > but implements transport layer operations by sending and receiving messages
> > instead of the "MMR" reads and writes used in virtio-mmio and virtio-pci.
> >
> > This transport is useful when the device and driver are both implemented in
> > software but the trap and emulate operations of virtio-mmio and virtio-pci
> > can not be used.
> >
> > This transport is intended to be used in many situations, including:
> > * between a host processor and its co-processors
> > * between two different systems (not SMP) connected via PCIe
> > * between normal and secure worlds
> > * host to vm
> > * vm to vm
> >
> > This is an RFC and not yet intended to be merged. There are multiple
> > know issues including not conforming to virtio spec standards.
> >
> > Signed-off-by: Bill Mills <[email protected]>
> > Signed-off-by: Bertrand Marquis <[email protected]>
> > Signed-off-by: Edgar E. Iglesias <[email protected]>
> > Signed-off-by: Arnaud Pouliquen <[email protected]>
>
> Ping?
>
> I'll be around at KVM Forum if anyone has any questions about our
> use-cases. We've reviewed stuff pretty thoroughly internally but
> obviously we need to input from the wider VirtIO community before
> proposing a vote.
>

I am interested in understanding the use-case. I'll also attend the
KVM Forum. I am afraid I won't have time before we meet to read the
patches.

Matias


> --
> Alex Bennée
> Virtualisation Tech Lead @ Linaro
>