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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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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