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/*
* Multifd VFIO migration
*
* Copyright (C) 2024,2025 Oracle and/or its affiliates.
*
* This work is licensed under the terms of the GNU GPL, version 2 or later.
* See the COPYING file in the top-level directory.
*
* SPDX-License-Identifier: GPL-2.0-or-later
*/
#include "qemu/osdep.h"
#include "hw/vfio/vfio-common.h"
#include "migration/misc.h"
#include "qapi/error.h"
#include "qemu/error-report.h"
#include "qemu/lockable.h"
#include "qemu/main-loop.h"
#include "qemu/thread.h"
#include "migration/qemu-file.h"
#include "migration-multifd.h"
#include "trace.h"
#define VFIO_DEVICE_STATE_CONFIG_STATE (1)
#define VFIO_DEVICE_STATE_PACKET_VER_CURRENT (0)
typedef struct VFIODeviceStatePacket {
uint32_t version;
uint32_t idx;
uint32_t flags;
uint8_t data[0];
} QEMU_PACKED VFIODeviceStatePacket;
typedef struct VFIOMultifd {
} VFIOMultifd;
static VFIOMultifd *vfio_multifd_new(void)
{
VFIOMultifd *multifd = g_new(VFIOMultifd, 1);
return multifd;
}
static void vfio_multifd_free(VFIOMultifd *multifd)
{
g_free(multifd);
}
void vfio_multifd_cleanup(VFIODevice *vbasedev)
{
VFIOMigration *migration = vbasedev->migration;
g_clear_pointer(&migration->multifd, vfio_multifd_free);
}
bool vfio_multifd_transfer_supported(void)
{
return multifd_device_state_supported() &&
migrate_send_switchover_start();
}
bool vfio_multifd_transfer_enabled(VFIODevice *vbasedev)
{
return false;
}
bool vfio_multifd_setup(VFIODevice *vbasedev, bool alloc_multifd, Error **errp)
{
VFIOMigration *migration = vbasedev->migration;
if (!vfio_multifd_transfer_enabled(vbasedev)) {
/* Nothing further to check or do */
return true;
}
if (alloc_multifd) {
assert(!migration->multifd);
migration->multifd = vfio_multifd_new();
}
return true;
}
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