diff options
author | Joao Martins <joao.m.martins@oracle.com> | 2023-03-07 12:54:48 +0000 |
---|---|---|
committer | Alex Williamson <alex.williamson@redhat.com> | 2023-03-07 10:21:22 -0700 |
commit | e46883204c384f992088f8c3ea713f7e1c2d5a6d (patch) | |
tree | e88ee1d09482d9107bdc21960013aa93fa04735d /hw/vfio | |
parent | b153402a8941c2193e91ac50ed9720c7da6ee8db (diff) |
vfio/migration: Block migration with vIOMMU
Migrating with vIOMMU will require either tracking maximum
IOMMU supported address space (e.g. 39/48 address width on Intel)
or range-track current mappings and dirty track the new ones
post starting dirty tracking. This will be done as a separate
series, so add a live migration blocker until that is fixed.
Signed-off-by: Joao Martins <joao.m.martins@oracle.com>
Reviewed-by: Cédric Le Goater <clg@redhat.com>
Link: https://lore.kernel.org/r/20230307125450.62409-14-joao.m.martins@oracle.com
Signed-off-by: Alex Williamson <alex.williamson@redhat.com>
Diffstat (limited to 'hw/vfio')
-rw-r--r-- | hw/vfio/common.c | 46 | ||||
-rw-r--r-- | hw/vfio/migration.c | 5 | ||||
-rw-r--r-- | hw/vfio/pci.c | 1 |
3 files changed, 52 insertions, 0 deletions
diff --git a/hw/vfio/common.c b/hw/vfio/common.c index 334c625858..539246e332 100644 --- a/hw/vfio/common.c +++ b/hw/vfio/common.c @@ -362,6 +362,7 @@ bool vfio_mig_active(void) } static Error *multiple_devices_migration_blocker; +static Error *giommu_migration_blocker; static unsigned int vfio_migratable_device_num(void) { @@ -413,6 +414,51 @@ void vfio_unblock_multiple_devices_migration(void) multiple_devices_migration_blocker = NULL; } +static bool vfio_viommu_preset(void) +{ + VFIOAddressSpace *space; + + QLIST_FOREACH(space, &vfio_address_spaces, list) { + if (space->as != &address_space_memory) { + return true; + } + } + + return false; +} + +int vfio_block_giommu_migration(Error **errp) +{ + int ret; + + if (giommu_migration_blocker || + !vfio_viommu_preset()) { + return 0; + } + + error_setg(&giommu_migration_blocker, + "Migration is currently not supported with vIOMMU enabled"); + ret = migrate_add_blocker(giommu_migration_blocker, errp); + if (ret < 0) { + error_free(giommu_migration_blocker); + giommu_migration_blocker = NULL; + } + + return ret; +} + +void vfio_unblock_giommu_migration(void) +{ + if (!giommu_migration_blocker || + vfio_viommu_preset()) { + return; + } + + migrate_del_blocker(giommu_migration_blocker); + error_free(giommu_migration_blocker); + giommu_migration_blocker = NULL; +} + static void vfio_set_migration_error(int err) { MigrationState *ms = migrate_get_current(); diff --git a/hw/vfio/migration.c b/hw/vfio/migration.c index a2c3d9bade..776fd2d7cd 100644 --- a/hw/vfio/migration.c +++ b/hw/vfio/migration.c @@ -634,6 +634,11 @@ int vfio_migration_probe(VFIODevice *vbasedev, Error **errp) return ret; } + ret = vfio_block_giommu_migration(errp); + if (ret) { + return ret; + } + trace_vfio_migration_probe(vbasedev->name); return 0; diff --git a/hw/vfio/pci.c b/hw/vfio/pci.c index 939dcc3d4a..30a271eab3 100644 --- a/hw/vfio/pci.c +++ b/hw/vfio/pci.c @@ -3185,6 +3185,7 @@ static void vfio_instance_finalize(Object *obj) */ vfio_put_device(vdev); vfio_put_group(group); + vfio_unblock_giommu_migration(); } static void vfio_exitfn(PCIDevice *pdev) |