Hi all,
This the RFC I'm preparing to send to upstream QEMU for initial RFC review.
A couple of limitations:
I've not updated the protocol with the new msg_token field yet.
We only support a single device per bus (dev_num = 0).
The kernel driver only works as a module, when building it into the kernel
it panics.
-------------------
This adds virtio-msg, a new virtio transport. Virtio-msg works by
exchanging messages over a bus and doesn't rely on trapping and emulating
making it a good fit for a number of applications such as AMP, real-time
and safety applications.
Together with the new transport, this series adds a PCI device that
implements an AMP setup much like it would look if two SoC's would
use virtio-msg across a PCI link.
The virtio-msg spec:
https://github.com/Linaro/virtio-msg-spec/
Linux with virtio-msg:
https://github.com/edgarigl/linux/tree/edgari/virtio-msg-6.17
To try it, first build Linux with the following as modules:
CONFIG_VIRTIO_MSG=m
CONFIG_VIRTIO_MSG_AMP=m
CONFIG_VIRTIO_MSG_AMP_PCI=m
Boot linux in QEMU with a virtio-msg-amp-pci device, in this example
with a virtio-net device attached to it (x86/q35 machine):
-device virtio-msg-amp-pci
-device virtio-net-device,netdev=n1,bus=/q35-pcihost/pcie.0/virtio-msg-amp-pci/vmsg.0
-netdev user,id=nc
Modprobe:
modprobe virtio_msg_transport.ko
modprobe virtio_msg_amp.ko
modprobe virtio_msg_amp_pci.ko
You now should see the virtio device.
Cheers,
Edgar
Edgar E. Iglesias (4):
virtio: Introduce notify_queue
virtio: Add virtio_queue_get_rings
virtio: Add the virtio-msg transport
virtio-msg-bus: amp-pci: Add generic AMP PCI device
hw/misc/Kconfig | 7 +
hw/misc/meson.build | 1 +
hw/misc/virtio-msg-amp-pci.c | 324 ++++++++++++
hw/virtio/Kconfig | 4 +
hw/virtio/meson.build | 5 +
hw/virtio/virtio-msg-bus.c | 89 ++++
hw/virtio/virtio-msg.c | 596 ++++++++++++++++++++++
hw/virtio/virtio.c | 23 +
include/hw/virtio/virtio-bus.h | 1 +
include/hw/virtio/virtio-msg-bus.h | 95 ++++
include/hw/virtio/virtio-msg-prot.h | 747 ++++++++++++++++++++++++++++
include/hw/virtio/virtio-msg.h | 45 ++
include/hw/virtio/virtio.h | 2 +
13 files changed, 1939 insertions(+)
create mode 100644 hw/misc/virtio-msg-amp-pci.c
create mode 100644 hw/virtio/virtio-msg-bus.c
create mode 100644 hw/virtio/virtio-msg.c
create mode 100644 include/hw/virtio/virtio-msg-bus.h
create mode 100644 include/hw/virtio/virtio-msg-prot.h
create mode 100644 include/hw/virtio/virtio-msg.h
--
2.43.0
Hi Everyone,
Today, Arm is releasing the first public version of the Virtio Message Bus over FF-A in version 1.0 and in quality state Alpha 0.
The document is available for download here:
https://developer.arm.com/documentation/den0153/0100
Please contact me if you have any comment, remarks, questions or improvements to suggest so that i can handle them before the spec reaches Beta quality.
Regards
Bertrand
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Hi,
I pushed the following pull request to github:
https://github.com/Linaro/virtio-msg-spec/pull/24
It is a proposal to handle some things we agreed on modifying in the spec:
- header size 8 byte
- unique identifier in header
- relax error handling to let bus report errors and be coherent with current linux implementation
This is a draft and i am definitely open to comments :-)
Cheers
Bertrand
IMPORTANT NOTICE: The contents of this email and any attachments are confidential and may also be privileged. If you are not the intended recipient, please notify the sender immediately and do not disclose the contents to any other person, use it for any purpose, or store or copy the information in any medium. Thank you.
