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vhost-vsock: add virtio sockets device

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Implement the new virtio sockets device for host<->guest communication
using the Sockets API.  Most of the work is done in a vhost kernel
driver so that virtio-vsock can hook into the AF_VSOCK address family.
The QEMU vhost-vsock device handles configuration and live migration
while the rx/tx happens in the vhost_vsock.ko Linux kernel driver.

The vsock device must be given a CID (host-wide unique address):

  # qemu -device vhost-vsock-pci,id=vhost-vsock-pci0,guest-cid=3 ...

For more information see:
http://qemu-project.org/Features/VirtioVsock

[Endianness fixes and virtio-ccw support by Claudio Imbrenda
<imbrenda@linux.vnet.ibm.com>]

Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com>
[mst: rebase to master]
Reviewed-by: Michael S. Tsirkin <mst@redhat.com>
Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
This commit is contained in:
Stefan Hajnoczi
2016-08-16 13:27:22 +01:00
committed by Michael S. Tsirkin
parent 947b205fdb
commit fc0b9b0e1c
11 changed files with 631 additions and 0 deletions
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5
include/hw/virtio/vhost-backend.h
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@@ -73,6 +73,9 @@ typedef int (*vhost_migration_done_op)(struct vhost_dev *dev,
typedef bool (*vhost_backend_can_merge_op)(struct vhost_dev *dev,
uint64_t start1, uint64_t size1,
uint64_t start2, uint64_t size2);
typedef int (*vhost_vsock_set_guest_cid_op)(struct vhost_dev *dev,
uint64_t guest_cid);
typedef int (*vhost_vsock_set_running_op)(struct vhost_dev *dev, int start);
typedef struct VhostOps {
VhostBackendType backend_type;
@@ -102,6 +105,8 @@ typedef struct VhostOps {
vhost_requires_shm_log_op vhost_requires_shm_log;
vhost_migration_done_op vhost_migration_done;
vhost_backend_can_merge_op vhost_backend_can_merge;
vhost_vsock_set_guest_cid_op vhost_vsock_set_guest_cid;
vhost_vsock_set_running_op vhost_vsock_set_running;
} VhostOps;
extern const VhostOps user_ops;