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/*
* VFIO migration
*
* Copyright Red Hat, Inc. 2025
*
* SPDX-License-Identifier: GPL-2.0-or-later
*/
#ifndef HW_VFIO_VFIO_MIGRATION_INTERNAL_H
#define HW_VFIO_VFIO_MIGRATION_INTERNAL_H
#ifdef CONFIG_LINUX
#include <linux/vfio.h>
#endif
#include "qemu/typedefs.h"
#include "qemu/notify.h"
/*
* Flags to be used as unique delimiters for VFIO devices in the migration
* stream. These flags are composed as:
* 0xffffffff => MSB 32-bit all 1s
* 0xef10 => Magic ID, represents emulated (virtual) function IO
* 0x0000 => 16-bits reserved for flags
*
* The beginning of state information is marked by _DEV_CONFIG_STATE,
* _DEV_SETUP_STATE, or _DEV_DATA_STATE, respectively. The end of a
* certain state information is marked by _END_OF_STATE.
*/
#define VFIO_MIG_FLAG_END_OF_STATE (0xffffffffef100001ULL)
#define VFIO_MIG_FLAG_DEV_CONFIG_STATE (0xffffffffef100002ULL)
#define VFIO_MIG_FLAG_DEV_SETUP_STATE (0xffffffffef100003ULL)
#define VFIO_MIG_FLAG_DEV_DATA_STATE (0xffffffffef100004ULL)
#define VFIO_MIG_FLAG_DEV_INIT_DATA_SENT (0xffffffffef100005ULL)
#define VFIO_MIG_FLAG_DEV_CONFIG_LOAD_READY (0xffffffffef100006ULL)
typedef struct VFIODevice VFIODevice;
typedef struct VFIOMultifd VFIOMultifd;
typedef struct VFIOMigration {
struct VFIODevice *vbasedev;
VMChangeStateEntry *vm_state;
NotifierWithReturn migration_state;
uint32_t device_state;
int data_fd;
void *data_buffer;
size_t data_buffer_size;
uint64_t mig_flags;
uint64_t precopy_init_size;
uint64_t precopy_dirty_size;
bool multifd_transfer;
VFIOMultifd *multifd;
bool initial_data_sent;
bool event_save_iterate_started;
bool event_precopy_empty_hit;
} VFIOMigration;
bool vfio_migration_realize(VFIODevice *vbasedev, Error **errp);
void vfio_migration_exit(VFIODevice *vbasedev);
bool vfio_device_state_is_running(VFIODevice *vbasedev);
bool vfio_device_state_is_precopy(VFIODevice *vbasedev);
int vfio_save_device_config_state(QEMUFile *f, void *opaque, Error **errp);
int vfio_load_device_config_state(QEMUFile *f, void *opaque);
#ifdef CONFIG_LINUX
int vfio_migration_set_state(VFIODevice *vbasedev,
enum vfio_device_mig_state new_state,
enum vfio_device_mig_state recover_state,
Error **errp);
#endif
void vfio_migration_add_bytes_transferred(unsigned long val);
#endif /* HW_VFIO_VFIO_MIGRATION_INTERNAL_H */
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