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vfio/migration: Make VFIO migration non-experimental

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The major parts of VFIO migration are supported today in QEMU. This
includes basic VFIO migration, device dirty page tracking and precopy
support.

Thus, at this point in time, it seems appropriate to make VFIO migration
non-experimental: remove the x prefix from enable_migration property,
change it to ON_OFF_AUTO and let the default value be AUTO.

In addition, make the following adjustments:
1. When enable_migration is ON and migration is not supported, fail VFIO
   device realization.
2. When enable_migration is AUTO (i.e., not explicitly enabled), require
   device dirty tracking support. This is because device dirty tracking
   is currently the only method to do dirty page tracking, which is
   essential for migrating in a reasonable downtime. Setting
   enable_migration to ON will not require device dirty tracking.
3. Make migration error and blocker messages more elaborate.
4. Remove error prints in vfio_migration_query_flags().
5. Rename trace_vfio_migration_probe() to
   trace_vfio_migration_realize().

Signed-off-by: Avihai Horon <avihaih@nvidia.com>
Reviewed-by: Joao Martins <joao.m.martins@oracle.com>
Reviewed-by: Cédric Le Goater <clg@redhat.com>
Reviewed-by: Alex Williamson <alex.williamson@redhat.com>
Signed-off-by: Cédric Le Goater <clg@redhat.com>
This commit is contained in:
Avihai Horon 2023-06-28 10:31:12 +03:00 • committed by Cédric Le Goater
parent 808642a2f6
commit 8bbcb64a71
5 changed files with 73 additions and 34 deletions
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6
include/hw/vfio/vfio-common.h
View file

@ -139,7 +139,7 @@ typedef struct VFIODevice {
bool needs_reset;
bool no_mmap;
bool ram_block_discard_allowed;
bool enable_migration;
OnOffAuto enable_migration;
VFIODeviceOps *ops;
unsigned int num_irqs;
unsigned int num_regions;
@ -225,9 +225,9 @@ typedef QLIST_HEAD(VFIOGroupList, VFIOGroup) VFIOGroupList;
extern VFIOGroupList vfio_group_list;
bool vfio_mig_active(void);
int vfio_block_multiple_devices_migration(Error **errp);
int vfio_block_multiple_devices_migration(VFIODevice *vbasedev, Error **errp);
void vfio_unblock_multiple_devices_migration(void);
int vfio_block_giommu_migration(Error **errp);
int vfio_block_giommu_migration(VFIODevice *vbasedev, Error **errp);
int64_t vfio_mig_bytes_transferred(void);
void vfio_reset_bytes_transferred(void);