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vfio: Add migration region initialization and finalize function

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Whether the VFIO device supports migration or not is decided based of
migration region query. If migration region query is successful and migration
region initialization is successful then migration is supported else
migration is blocked.

Signed-off-by: Kirti Wankhede <kwankhede@nvidia.com>
Reviewed-by: Neo Jia <cjia@nvidia.com>
Acked-by: Dr. David Alan Gilbert <dgilbert@redhat.com>
Reviewed-by: Cornelia Huck <cohuck@redhat.com>
Signed-off-by: Alex Williamson <alex.williamson@redhat.com>
This commit is contained in:
Kirti Wankhede 2020-10-26 15:06:14 +05:30 • committed by Alex Williamson
parent c5e2fb3ce4
commit a9e271ec9b
4 changed files with 135 additions and 0 deletions
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122
hw/vfio/migration.c Normal file
View file

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/*
* Migration support for VFIO devices
*
* Copyright NVIDIA, Inc. 2020
*
* This work is licensed under the terms of the GNU GPL, version 2. See
* the COPYING file in the top-level directory.
*/
#include "qemu/osdep.h"
#include <linux/vfio.h>
#include "hw/vfio/vfio-common.h"
#include "cpu.h"
#include "migration/migration.h"
#include "migration/qemu-file.h"
#include "migration/register.h"
#include "migration/blocker.h"
#include "migration/misc.h"
#include "qapi/error.h"
#include "exec/ramlist.h"
#include "exec/ram_addr.h"
#include "pci.h"
#include "trace.h"
static void vfio_migration_exit(VFIODevice *vbasedev)
{
VFIOMigration *migration = vbasedev->migration;
vfio_region_exit(&migration->region);
vfio_region_finalize(&migration->region);
g_free(vbasedev->migration);
vbasedev->migration = NULL;
}
static int vfio_migration_init(VFIODevice *vbasedev,
struct vfio_region_info *info)
{
int ret;
Object *obj;
if (!vbasedev->ops->vfio_get_object) {
return -EINVAL;
}
obj = vbasedev->ops->vfio_get_object(vbasedev);
if (!obj) {
return -EINVAL;
}
vbasedev->migration = g_new0(VFIOMigration, 1);
ret = vfio_region_setup(obj, vbasedev, &vbasedev->migration->region,
info->index, "migration");
if (ret) {
error_report("%s: Failed to setup VFIO migration region %d: %s",
vbasedev->name, info->index, strerror(-ret));
goto err;
}
if (!vbasedev->migration->region.size) {
error_report("%s: Invalid zero-sized VFIO migration region %d",
vbasedev->name, info->index);
ret = -EINVAL;
goto err;
}
return 0;
err:
vfio_migration_exit(vbasedev);
return ret;
}
/* ---------------------------------------------------------------------- */
int vfio_migration_probe(VFIODevice *vbasedev, Error **errp)
{
struct vfio_region_info *info = NULL;
Error *local_err = NULL;
int ret;
ret = vfio_get_dev_region_info(vbasedev, VFIO_REGION_TYPE_MIGRATION,
VFIO_REGION_SUBTYPE_MIGRATION, &info);
if (ret) {
goto add_blocker;
}
ret = vfio_migration_init(vbasedev, info);
if (ret) {
goto add_blocker;
}
g_free(info);
trace_vfio_migration_probe(vbasedev->name, info->index);
return 0;
add_blocker:
error_setg(&vbasedev->migration_blocker,
"VFIO device doesn't support migration");
g_free(info);
ret = migrate_add_blocker(vbasedev->migration_blocker, &local_err);
if (local_err) {
error_propagate(errp, local_err);
error_free(vbasedev->migration_blocker);
vbasedev->migration_blocker = NULL;
}
return ret;
}
void vfio_migration_finalize(VFIODevice *vbasedev)
{
if (vbasedev->migration) {
vfio_migration_exit(vbasedev);
}
if (vbasedev->migration_blocker) {
migrate_del_blocker(vbasedev->migration_blocker);
error_free(vbasedev->migration_blocker);
vbasedev->migration_blocker = NULL;
}
}