From: "Edgar E. Iglesias" <edgar.iglesias@amd.com>
This adds virtio-msg, a new virtio transport. Virtio-msg works by
exchanging messages over a bus and doesn't rely on trapping and emulation
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 could look if two SoC's would
use virtio-msg across a PCI link.
Current gaps and limitations:
Shared memory FIFO layout likely to change in the future.
Temporarily uses PCI Vendor Xilinx / Device 0x9039.
Documentation.
The virtio-msg draft spec:
https://github.com/Linaro/virtio-msg-spec/
QEMU with these patches:
https://github.com/edgarigl/qemu/tree/edgar/virtio-msg-rfc
Linux with virtio-msg support:
https://github.com/edgarigl/linux/tree/edgari/virtio-msg-6.17
To try it, first build Linux with the following enabled:
CONFIG_VIRTIO_MSG=y
CONFIG_VIRTIO_MSG_AMP=y
CONFIG_VIRTIO_MSG_AMP_PCI=y
Boot linux on QEMU with a virtio-msg-amp-pci device, in this example
with a virtio-net device attached to it:
-device virtio-msg-amp-pci
-device virtio-net-device,netdev=n0
-netdev user,id=n0
If you're running on a QEMU machine that has virtio-mmio enabled, e.g
ARM virt, you'll need to specify the virtio-bus for the device, otherwise
QEMU will connect it to virtio-mmio. For ARM virt machines:
-device virtio-msg-amp-pci
-device virtio-net-device,netdev=n0,bus=/gpex-pcihost/pcie.0/virtio-msg-amp-pci/fifo0/virtio-msg/bus0/virtio-msg-dev
-netdev user,id=n0
Cheers,
Edgar
Edgar E. Iglesias (5):
virtio: Introduce notify_queue
virtio: Add virtio_queue_get_rings
virtio: Add the virtio-msg transport
hw/misc: Add generic virtio-msg AMP PCI device
docs: Describe virtio-msg-amp-pci
.../devices/virtio/virtio-msg-amp-pci.rst | 70 ++
hw/misc/Kconfig | 7 +
hw/misc/meson.build | 1 +
hw/misc/virtio-msg-amp-pci.c | 328 +++++++
hw/virtio/Kconfig | 4 +
hw/virtio/meson.build | 5 +
hw/virtio/virtio-msg-bus.c | 89 ++
hw/virtio/virtio-msg.c | 695 ++++++++++++++
hw/virtio/virtio.c | 23 +
include/hw/virtio/spsc_queue.h | 213 +++++
include/hw/virtio/virtio-bus.h | 1 +
include/hw/virtio/virtio-msg-bus.h | 95 ++
include/hw/virtio/virtio-msg-prot.h | 846 ++++++++++++++++++
include/hw/virtio/virtio-msg.h | 56 ++
include/hw/virtio/virtio.h | 2 +
15 files changed, 2435 insertions(+)
create mode 100644 docs/system/devices/virtio/virtio-msg-amp-pci.rst
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/spsc_queue.h
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