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vhost-user: add new vhost user messages to support virtio config space

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Add VHOST_USER_GET_CONFIG/VHOST_USER_SET_CONFIG messages which can be
used for live migration of vhost user devices, also vhost user devices
can benefit from the messages to get/set virtio config space from/to the
I/O target. For the purpose to support virtio config space change,
VHOST_USER_SLAVE_CONFIG_CHANGE_MSG message is added as the event notifier
in case virtio config space change in the slave I/O target.

Signed-off-by: Changpeng Liu <changpeng.liu@intel.com>
Reviewed-by: Marc-André Lureau <marcandre.lureau@redhat.com>
Reviewed-by: Michael S. Tsirkin <mst@redhat.com>
Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
This commit is contained in:
Changpeng Liu 2018-01-04 09:53:31 +08:00 • committed by Michael S. Tsirkin
parent 1bcf209154
commit 4c3e257b5e
5 changed files with 232 additions and 0 deletions
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12
include/hw/virtio/vhost-backend.h
View file

@ -20,6 +20,11 @@ typedef enum VhostBackendType {
VHOST_BACKEND_TYPE_MAX = 3,
} VhostBackendType;
typedef enum VhostSetConfigType {
VHOST_SET_CONFIG_TYPE_MASTER = 0,
VHOST_SET_CONFIG_TYPE_MIGRATION = 1,
} VhostSetConfigType;
struct vhost_dev;
struct vhost_log;
struct vhost_memory;
@ -84,6 +89,11 @@ typedef void (*vhost_set_iotlb_callback_op)(struct vhost_dev *dev,
int enabled);
typedef int (*vhost_send_device_iotlb_msg_op)(struct vhost_dev *dev,
struct vhost_iotlb_msg *imsg);
typedef int (*vhost_set_config_op)(struct vhost_dev *dev, const uint8_t *data,
uint32_t offset, uint32_t size,
uint32_t flags);
typedef int (*vhost_get_config_op)(struct vhost_dev *dev, uint8_t *config,
uint32_t config_len);
typedef struct VhostOps {
VhostBackendType backend_type;
@ -118,6 +128,8 @@ typedef struct VhostOps {
vhost_vsock_set_running_op vhost_vsock_set_running;
vhost_set_iotlb_callback_op vhost_set_iotlb_callback;
vhost_send_device_iotlb_msg_op vhost_send_device_iotlb_msg;
vhost_get_config_op vhost_get_config;
vhost_set_config_op vhost_set_config;
} VhostOps;
extern const VhostOps user_ops;

15
include/hw/virtio/vhost.h
View file

@ -46,6 +46,12 @@ struct vhost_iommu {
QLIST_ENTRY(vhost_iommu) iommu_next;
};
typedef struct VhostDevConfigOps {
/* Vhost device config space changed callback
*/
int (*vhost_dev_config_notifier)(struct vhost_dev *dev);
} VhostDevConfigOps;
struct vhost_memory;
struct vhost_dev {
VirtIODevice *vdev;
@ -76,6 +82,7 @@ struct vhost_dev {
QLIST_ENTRY(vhost_dev) entry;
QLIST_HEAD(, vhost_iommu) iommu_list;
IOMMUNotifier n;
const VhostDevConfigOps *config_ops;
};
int vhost_dev_init(struct vhost_dev *hdev, void *opaque,
@ -106,4 +113,12 @@ int vhost_net_set_backend(struct vhost_dev *hdev,
struct vhost_vring_file *file);
int vhost_device_iotlb_miss(struct vhost_dev *dev, uint64_t iova, int write);
int vhost_dev_get_config(struct vhost_dev *dev, uint8_t *config,
uint32_t config_len);
int vhost_dev_set_config(struct vhost_dev *dev, const uint8_t *data,
uint32_t offset, uint32_t size, uint32_t flags);
/* notifier callback in case vhost device config space changed
*/
void vhost_dev_set_config_notifier(struct vhost_dev *dev,
const VhostDevConfigOps *ops);
#endif