On Wed, Dec 09, 2015 at 08:03:49PM +0800, Stefan Hajnoczi wrote:
> Note: the virtio-vsock device specification is currently under review but not
> yet finalized. Please review this code but don't merge until I send an update
> when the spec is finalized. Thanks!
Yes, this should have RFC in the subject.
> v3:
> * Remove unnecessary 3-way handshake, just do REQUEST/RESPONSE instead
>of REQUEST/RESPONSE/ACK
> * Remove SOCK_DGRAM support and focus on SOCK_STREAM first
>(also drop v2 Patch 1, it's only needed for SOCK_DGRAM)
> * Only allow host->guest connections (same security model as latest
>VMware)
> * Don't put vhost vsock driver into staging
> * Add missing Kconfig dependencies (Arnd Bergmann )
> * Remove unneeded variable used to store return value
>(Fengguang Wu and Julia Lawall
>)
>
> v2:
> * Rebased onto Linux v4.4-rc2
> * vhost: Refuse to assign reserved CIDs
> * vhost: Refuse guest CID if already in use
> * vhost: Only accept correctly addressed packets (no spoofing!)
> * vhost: Support flexible rx/tx descriptor layout
> * vhost: Add missing total_tx_buf decrement
> * virtio_transport: Fix total_tx_buf accounting
> * virtio_transport: Add virtio_transport global mutex to prevent races
> * common: Notify other side of SOCK_STREAM disconnect (fixes shutdown
>semantics)
> * common: Avoid recursive mutex_lock(tx_lock) for write_space (fixes
> deadlock)
> * common: Define VIRTIO_VSOCK_TYPE_STREAM/DGRAM hardware interface constants
> * common: Define VIRTIO_VSOCK_SHUTDOWN_RCV/SEND hardware interface constants
> * common: Fix peer_buf_alloc inheritance on child socket
>
> This patch series adds a virtio transport for AF_VSOCK (net/vmw_vsock/).
> AF_VSOCK is designed for communication between virtual machines and
> hypervisors. It is currently only implemented for VMware's VMCI transport.
>
> This series implements the proposed virtio-vsock device specification from
> here:
> http://permalink.gmane.org/gmane.comp.emulators.virtio.devel/980
>
> Most of the work was done by Asias He and Gerd Hoffmann a while back. I have
> picked up the series again.
>
> The QEMU userspace changes are here:
> https://github.com/stefanha/qemu/commits/vsock
>
> Why virtio-vsock?
> -
> Guest<->host communication is currently done over the virtio-serial device.
> This makes it hard to port sockets API-based applications and is limited to
> static ports.
>
> virtio-vsock uses the sockets API so that applications can rely on familiar
> SOCK_STREAM semantics. Applications on the host can easily connect to guest
> agents because the sockets API allows multiple connections to a listen socket
> (unlike virtio-serial). This simplifies the guest<->host communication and
> eliminates the need for extra processes on the host to arbitrate virtio-serial
> ports.
>
> Overview
>
> This series adds 3 pieces:
>
> 1. virtio_transport_common.ko - core virtio vsock code that uses vsock.ko
>
> 2. virtio_transport.ko - guest driver
>
> 3. drivers/vhost/vsock.ko - host driver
>
> Howto
> -
> The following kernel options are needed:
> CONFIG_VSOCKETS=y
> CONFIG_VIRTIO_VSOCKETS=y
> CONFIG_VIRTIO_VSOCKETS_COMMON=y
> CONFIG_VHOST_VSOCK=m
>
> Launch QEMU as follows:
> # qemu ... -device vhost-vsock-pci,id=vhost-vsock-pci0,guest-cid=3
>
> Guest and host can communicate via AF_VSOCK sockets. The host's CID (address)
> is 2 and the guest must be assigned a CID (3 in the example above).
>
> Status
> --
> This patch series implements the latest draft specification. Please review.
>
> Asias He (4):
> VSOCK: Introduce virtio-vsock-common.ko
> VSOCK: Introduce virtio-vsock.ko
> VSOCK: Introduce vhost-vsock.ko
> VSOCK: Add Makefile and Kconfig
>
> drivers/vhost/Kconfig | 10 +
> drivers/vhost/Makefile | 4 +
> drivers/vhost/vsock.c | 628 +++
> drivers/vhost/vsock.h | 4 +
> include/linux/virtio_vsock.h| 203
> include/uapi/linux/virtio_ids.h | 1 +
> include/uapi/linux/virtio_vsock.h | 87
> net/vmw_vsock/Kconfig | 18 +
> net/vmw_vsock/Makefile | 2 +
> net/vmw_vsock/virtio_transport.c| 466 +
> net/vmw_vsock/virtio_transport_common.c | 854
>
> 11 files changed, 2277 insertions(+)
> create mode 100644 drivers/vhost/vsock.c
> create mode 100644 drivers/vhost/vsock.h
> create mode 100644 include/linux/virtio_vsock.h
> create mode 100644 include/uapi/linux/virtio_vsock.h
> create mode 100644 net/vmw_vsock/virtio_transport.c
> create mode 100644 net/vmw_vsock/virtio_transport_common.c
>
> --
> 2.5.0
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