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| author | Alex Williamson | 2020-11-09 19:56:02 +0100 |
|---|---|---|
| committer | Alex Williamson | 2020-11-23 16:29:29 +0100 |
| commit | cf254988a50d4164c86a356c80b8d3ae0ccaa005 (patch) | |
| tree | 5e5994ade2dc6b1c9e41c0e150944b628fb087b6 /hw/vfio | |
| parent | Merge remote-tracking branch 'remotes/stefanha-gitlab/tags/block-pull-request... (diff) | |
| download | qemu-cf254988a50d4164c86a356c80b8d3ae0ccaa005.tar.gz qemu-cf254988a50d4164c86a356c80b8d3ae0ccaa005.tar.xz qemu-cf254988a50d4164c86a356c80b8d3ae0ccaa005.zip | |
vfio: Make migration support experimental
Support for migration of vfio devices is still in flux. Developers
are attempting to add support for new devices and new architectures,
but none are yet readily available for validation. We have concerns
whether we're transferring device resources at the right point in the
migration, whether we're guaranteeing that updates during pre-copy are
migrated, and whether we can provide bit-stream compatibility should
any of this change. Even the question of whether devices should
participate in dirty page tracking during pre-copy seems contentious.
In short, migration support has not had enough soak time and it feels
premature to mark it as supported.
Create an experimental option such that we can continue to develop.
[Retaining previous acks/reviews for a previously identical code
change with different specifics in the commit log.]
Reviewed-by: Dr. David Alan Gilbert <dgilbert@redhat.com>
Acked-by: Cornelia Huck <cohuck@redhat.com>
Signed-off-by: Alex Williamson <alex.williamson@redhat.com>
Diffstat (limited to 'hw/vfio')
| -rw-r--r-- | hw/vfio/migration.c | 2 | ||||
| -rw-r--r-- | hw/vfio/pci.c | 2 |
2 files changed, 3 insertions, 1 deletions
diff --git a/hw/vfio/migration.c b/hw/vfio/migration.c index 55261562d4..00daa50ed8 100644 --- a/hw/vfio/migration.c +++ b/hw/vfio/migration.c @@ -882,7 +882,7 @@ int vfio_migration_probe(VFIODevice *vbasedev, Error **errp) Error *local_err = NULL; int ret = -ENOTSUP; - if (!container->dirty_pages_supported) { + if (!vbasedev->enable_migration || !container->dirty_pages_supported) { goto add_blocker; } diff --git a/hw/vfio/pci.c b/hw/vfio/pci.c index 58c0ce8971..1349b900e5 100644 --- a/hw/vfio/pci.c +++ b/hw/vfio/pci.c @@ -3194,6 +3194,8 @@ static Property vfio_pci_dev_properties[] = { VFIO_FEATURE_ENABLE_REQ_BIT, true), DEFINE_PROP_BIT("x-igd-opregion", VFIOPCIDevice, features, VFIO_FEATURE_ENABLE_IGD_OPREGION_BIT, false), + DEFINE_PROP_BOOL("x-enable-migration", VFIOPCIDevice, + vbasedev.enable_migration, false), DEFINE_PROP_BOOL("x-no-mmap", VFIOPCIDevice, vbasedev.no_mmap, false), DEFINE_PROP_BOOL("x-balloon-allowed", VFIOPCIDevice, vbasedev.ram_block_discard_allowed, false), |