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/*
* Copyright (c) 2024-2025 Oracle and/or its affiliates.
*
* SPDX-License-Identifier: GPL-2.0-or-later
*/
#include "qemu/osdep.h"
#include "qemu/error-report.h"
#include "qapi/error.h"
#include "hw/vfio/vfio-cpr.h"
#include "hw/vfio/vfio-device.h"
#include "migration/blocker.h"
#include "migration/cpr.h"
#include "migration/migration.h"
#include "migration/vmstate.h"
#include "system/iommufd.h"
#include "vfio-iommufd.h"
#include "trace.h"
typedef struct CprVFIODevice {
char *name;
unsigned int namelen;
uint32_t ioas_id;
int devid;
uint32_t hwpt_id;
QLIST_ENTRY(CprVFIODevice) next;
} CprVFIODevice;
static const VMStateDescription vmstate_cpr_vfio_device = {
.name = "cpr vfio device",
.version_id = 1,
.minimum_version_id = 1,
.fields = (VMStateField[]) {
VMSTATE_UINT32(namelen, CprVFIODevice),
VMSTATE_VBUFFER_ALLOC_UINT32(name, CprVFIODevice, 0, NULL, namelen),
VMSTATE_INT32(devid, CprVFIODevice),
VMSTATE_UINT32(ioas_id, CprVFIODevice),
VMSTATE_UINT32(hwpt_id, CprVFIODevice),
VMSTATE_END_OF_LIST()
}
};
const VMStateDescription vmstate_cpr_vfio_devices = {
.name = CPR_STATE "/vfio devices",
.version_id = 1,
.minimum_version_id = 1,
.fields = (const VMStateField[]){
VMSTATE_QLIST_V(vfio_devices, CprState, 1, vmstate_cpr_vfio_device,
CprVFIODevice, next),
VMSTATE_END_OF_LIST()
}
};
static void vfio_cpr_save_device(VFIODevice *vbasedev)
{
CprVFIODevice *elem = g_new0(CprVFIODevice, 1);
elem->name = g_strdup(vbasedev->name);
elem->namelen = strlen(vbasedev->name) + 1;
elem->ioas_id = vbasedev->cpr.ioas_id;
elem->devid = vbasedev->devid;
elem->hwpt_id = vbasedev->cpr.hwpt_id;
QLIST_INSERT_HEAD(&cpr_state.vfio_devices, elem, next);
}
static CprVFIODevice *find_device(const char *name)
{
CprVFIODeviceList *head = &cpr_state.vfio_devices;
CprVFIODevice *elem;
QLIST_FOREACH(elem, head, next) {
if (!strcmp(elem->name, name)) {
return elem;
}
}
return NULL;
}
static void vfio_cpr_delete_device(const char *name)
{
CprVFIODevice *elem = find_device(name);
if (elem) {
QLIST_REMOVE(elem, next);
g_free(elem->name);
g_free(elem);
}
}
static bool vfio_cpr_find_device(VFIODevice *vbasedev)
{
CprVFIODevice *elem = find_device(vbasedev->name);
if (elem) {
vbasedev->cpr.ioas_id = elem->ioas_id;
vbasedev->devid = elem->devid;
vbasedev->cpr.hwpt_id = elem->hwpt_id;
trace_vfio_cpr_find_device(elem->ioas_id, elem->devid, elem->hwpt_id);
return true;
}
return false;
}
static bool vfio_cpr_supported(IOMMUFDBackend *be, Error **errp)
{
if (!iommufd_change_process_capable(be)) {
if (errp) {
error_setg(errp, "vfio iommufd backend does not support "
"IOMMU_IOAS_CHANGE_PROCESS");
}
return false;
}
return true;
}
static int iommufd_cpr_pre_save(void *opaque)
{
IOMMUFDBackend *be = opaque;
/*
* The process has not changed yet, but proactively try the ioctl,
* and it will fail if any DMA mappings are not supported.
*/
if (!iommufd_change_process_capable(be)) {
error_report("some memory regions do not support "
"IOMMU_IOAS_CHANGE_PROCESS");
return -1;
}
return 0;
}
static int iommufd_cpr_post_load(void *opaque, int version_id)
{
IOMMUFDBackend *be = opaque;
Error *local_err = NULL;
if (!iommufd_change_process(be, &local_err)) {
error_report_err(local_err);
return -1;
}
return 0;
}
static const VMStateDescription iommufd_cpr_vmstate = {
.name = "iommufd",
.version_id = 0,
.minimum_version_id = 0,
.pre_save = iommufd_cpr_pre_save,
.post_load = iommufd_cpr_post_load,
.needed = cpr_incoming_needed,
.fields = (VMStateField[]) {
VMSTATE_END_OF_LIST()
}
};
bool vfio_iommufd_cpr_register_iommufd(IOMMUFDBackend *be, Error **errp)
{
Error **cpr_blocker = &be->cpr_blocker;
if (!vfio_cpr_supported(be, cpr_blocker)) {
return migrate_add_blocker_modes(cpr_blocker, errp,
MIG_MODE_CPR_TRANSFER, -1) == 0;
}
vmstate_register(NULL, -1, &iommufd_cpr_vmstate, be);
return true;
}
void vfio_iommufd_cpr_unregister_iommufd(IOMMUFDBackend *be)
{
vmstate_unregister(NULL, &iommufd_cpr_vmstate, be);
migrate_del_blocker(&be->cpr_blocker);
}
bool vfio_iommufd_cpr_register_container(VFIOIOMMUFDContainer *container,
Error **errp)
{
VFIOContainerBase *bcontainer = &container->bcontainer;
migration_add_notifier_mode(&bcontainer->cpr_reboot_notifier,
vfio_cpr_reboot_notifier,
MIG_MODE_CPR_REBOOT);
vfio_cpr_add_kvm_notifier();
return true;
}
void vfio_iommufd_cpr_unregister_container(VFIOIOMMUFDContainer *container)
{
VFIOContainerBase *bcontainer = &container->bcontainer;
migration_remove_notifier(&bcontainer->cpr_reboot_notifier);
}
void vfio_iommufd_cpr_register_device(VFIODevice *vbasedev)
{
if (!cpr_is_incoming()) {
/*
* Beware fd may have already been saved by vfio_device_set_fd,
* so call resave to avoid a duplicate entry.
*/
cpr_resave_fd(vbasedev->name, 0, vbasedev->fd);
vfio_cpr_save_device(vbasedev);
}
}
void vfio_iommufd_cpr_unregister_device(VFIODevice *vbasedev)
{
cpr_delete_fd(vbasedev->name, 0);
vfio_cpr_delete_device(vbasedev->name);
}
void vfio_cpr_load_device(VFIODevice *vbasedev)
{
if (cpr_is_incoming()) {
bool ret = vfio_cpr_find_device(vbasedev);
g_assert(ret);
if (vbasedev->fd < 0) {
vbasedev->fd = cpr_find_fd(vbasedev->name, 0);
}
}
}
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