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virtio-devices: net: add guest-announce plumbing

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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>
This commit is contained in:
Sebastian Eydam
2026-03-31 13:21:59 +02:00
committed by Rob Bradford
parent e17c0be127
commit 53a00c0514
9 changed files with 967 additions and 125 deletions
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docs/snapshot_restore.md
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@@ -102,6 +102,9 @@ after restore completes:
At this point, the VM is fully restored and is identical to the VM which was
snapshot earlier.
See [Network Announcements After Resume](live_migration.md#network-announcements-after-resume)
for the announcement behavior after restore/resume.
Restore also supports selecting how guest memory is populated:
```bash