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vhost-user: Interface for migration state transfer

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Add the interface for transferring the back-end's state during migration
as defined previously in vhost-user.rst.

Reviewed-by: Stefan Hajnoczi <stefanha@redhat.com>
Signed-off-by: Hanna Czenczek <hreitz@redhat.com>
Message-Id: <20231016134243.68248-6-hreitz@redhat.com>
Reviewed-by: Michael S. Tsirkin <mst@redhat.com>
Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
This commit is contained in:
Hanna Czenczek 2023-10-16 15:42:41 +02:00 • committed by Michael S. Tsirkin
parent 019233096c
commit cda83adc62
5 changed files with 286 additions and 0 deletions
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24
include/hw/virtio/vhost-backend.h
View file

@ -26,6 +26,18 @@ typedef enum VhostSetConfigType {
VHOST_SET_CONFIG_TYPE_MIGRATION = 1,
} VhostSetConfigType;
typedef enum VhostDeviceStateDirection {
/* Transfer state from back-end (device) to front-end */
VHOST_TRANSFER_STATE_DIRECTION_SAVE = 0,
/* Transfer state from front-end to back-end (device) */
VHOST_TRANSFER_STATE_DIRECTION_LOAD = 1,
} VhostDeviceStateDirection;
typedef enum VhostDeviceStatePhase {
/* The device (and all its vrings) is stopped */
VHOST_TRANSFER_STATE_PHASE_STOPPED = 0,
} VhostDeviceStatePhase;
struct vhost_inflight;
struct vhost_dev;
struct vhost_log;
@ -129,6 +141,15 @@ typedef int (*vhost_set_config_call_op)(struct vhost_dev *dev,
typedef void (*vhost_reset_status_op)(struct vhost_dev *dev);
typedef bool (*vhost_supports_device_state_op)(struct vhost_dev *dev);
typedef int (*vhost_set_device_state_fd_op)(struct vhost_dev *dev,
VhostDeviceStateDirection direction,
VhostDeviceStatePhase phase,
int fd,
int *reply_fd,
Error **errp);
typedef int (*vhost_check_device_state_op)(struct vhost_dev *dev, Error **errp);
typedef struct VhostOps {
VhostBackendType backend_type;
vhost_backend_init vhost_backend_init;
@ -176,6 +197,9 @@ typedef struct VhostOps {
vhost_force_iommu_op vhost_force_iommu;
vhost_set_config_call_op vhost_set_config_call;
vhost_reset_status_op vhost_reset_status;
vhost_supports_device_state_op vhost_supports_device_state;
vhost_set_device_state_fd_op vhost_set_device_state_fd;
vhost_check_device_state_op vhost_check_device_state;
} VhostOps;
int vhost_backend_update_device_iotlb(struct vhost_dev *dev,