Add a live migration section to the VFIO documentation covering the
requirements beyond snapshot and restore, the dirty tracking behavior,
the destination file descriptor substitution with an example, and the
failure recovery behavior. Link it from the live migration and
snapshot sections.
Signed-off-by: Saravanan D <saravanand@crusoe.ai>
Advertise `VIRTIO_NET_F_GUEST_ANNOUNCE` on virtio-net devices, surface
`VIRTIO_NET_S_ANNOUNCE` through config status, and handle
`VIRTIO_NET_CTRL_ANNOUNCE_ACK` on the control queue.
This adds the guest-visible state needed for post-migration or
post-restore announce requests; the VMM side triggering is added in
follow-up commits.
The motivation is to reduce post-migration and post-restore
connectivity gap. After a live migration or after restoring, it can
take the guest several seconds to be reachable again over the network.
With these announcements, the network path should be refreshed within a
few milliseconds.
On-behalf-of: SAP sebastian.eydam@sap.com
Signed-off-by: Sebastian Eydam <sebastian.eydam@cyberus-technology.de>
Wire up the source side of postcopy migration over TCP. When
`mode=postcopy` is requested on vm.send-migration, the source skips
the pre-copy dirty-tracking loop and lets the destination resume early,
then serves guest pages on demand over a dedicated connection.
Signed-off-by: Sebastien Boeuf <sboeuf@meta.com>
Assisted-by: Claude:claude-opus-4-7
Document how live migration protocol versions are handled, including
the supported current/previous version window and the need to migrate
through an intermediate Cloud Hypervisor version for larger version
gaps.
On-behalf-of: SAP leander.kohler@sap.com
Signed-off-by: Leander Kohler <leander.kohler@cyberus-technology.de>
Minor modifications were made to make the sentences sound more natural.
Also fixed some parameter usage issues in bash code block.
Signed-off-by: Yi Wang <foxywang@tencent.com>
Updated the live migration documentation to include instructions for
performing cross-host live migrations over TCP connections.
Signed-off-by: Jinrong Liang <cloudliang@tencent.com>
The previous docs were very developer centric and have led several
people to believe that cross-machine migration is not supported at
all.
Signed-off-by: Julian Stecklina <julian.stecklina@cyberus-technology.de>
I've added newlines between paragraphs and code blocks for easier
reading. I've also changed the code blocks to use the correct
highlighting.
Signed-off-by: Julian Stecklina <julian.stecklina@cyberus-technology.de>
To enable live-migration for vhost-user devices, we now always shutdown
the source VM when the migration is completed. This patch reflects this
change in the documentation.
Signed-off-by: Bo Chen <chen.bo@intel.com>
