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vhost-vdpa: introduce vhost-vdpa backend

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Currently we have 2 types of vhost backends in QEMU: vhost kernel and
vhost-user. The above patch provides a generic device for vDPA purpose,
this vDPA device exposes to user space a non-vendor-specific configuration
interface for setting up a vhost HW accelerator, this patch set introduces
a third vhost backend called vhost-vdpa based on the vDPA interface.

Vhost-vdpa usage:

qemu-system-x86_64 -cpu host -enable-kvm \
    ......
    -netdev type=vhost-vdpa,vhostdev=/dev/vhost-vdpa-id,id=vhost-vdpa0 \
    -device virtio-net-pci,netdev=vhost-vdpa0,page-per-vq=on \

Signed-off-by: Lingshan zhu <lingshan.zhu@intel.com>
Signed-off-by: Tiwei Bie <tiwei.bie@intel.com>
Signed-off-by: Cindy Lu <lulu@redhat.com>
Signed-off-by: Jason Wang <jasowang@redhat.com>
Message-Id: <20200701145538.22333-14-lulu@redhat.com>
Reviewed-by: Michael S. Tsirkin <mst@redhat.com>
Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
Acked-by: Jason Wang <jasowang@redhat.com>
This commit is contained in:
Cindy Lu 2020-07-01 22:55:37 +08:00 • committed by Michael S. Tsirkin
parent 38140cc4d9
commit 108a64818e
12 changed files with 600 additions and 7 deletions
Download patch file Download diff file Expand all files Collapse all files

4
include/hw/virtio/vhost-backend.h
View file

@ -17,7 +17,8 @@ typedef enum VhostBackendType {
VHOST_BACKEND_TYPE_NONE = 0,
VHOST_BACKEND_TYPE_KERNEL = 1,
VHOST_BACKEND_TYPE_USER = 2,
VHOST_BACKEND_TYPE_MAX = 3,
VHOST_BACKEND_TYPE_VDPA = 3,
VHOST_BACKEND_TYPE_MAX = 4,
} VhostBackendType;
typedef enum VhostSetConfigType {
@ -170,6 +171,7 @@ typedef struct VhostOps {
} VhostOps;
extern const VhostOps user_ops;
extern const VhostOps vdpa_ops;
int vhost_set_backend_type(struct vhost_dev *dev,
VhostBackendType backend_type);

26
include/hw/virtio/vhost-vdpa.h Normal file
View file

@ -0,0 +1,26 @@
/*
* vhost-vdpa.h
*
* Copyright(c) 2017-2018 Intel Corporation.
* Copyright(c) 2020 Red Hat, Inc.
*
* This work is licensed under the terms of the GNU GPL, version 2 or later.
* See the COPYING file in the top-level directory.
*
*/
#ifndef HW_VIRTIO_VHOST_VDPA_H
#define HW_VIRTIO_VHOST_VDPA_H
#include "hw/virtio/virtio.h"
typedef struct vhost_vdpa {
int device_fd;
uint32_t msg_type;
MemoryListener listener;
} VhostVDPA;
extern AddressSpace address_space_memory;
extern int vhost_vdpa_get_device_id(struct vhost_dev *dev,
uint32_t *device_id);
#endif

7
include/hw/virtio/vhost.h
View file

@ -92,6 +92,13 @@ struct vhost_dev {
const VhostDevConfigOps *config_ops;
};
struct vhost_net {
struct vhost_dev dev;
struct vhost_virtqueue vqs[2];
int backend;
NetClientState *nc;
};
int vhost_dev_init(struct vhost_dev *hdev, void *opaque,
VhostBackendType backend_type,
uint32_t busyloop_timeout);