On 28.01.26 23:39, Ben Chaney wrote:
Tap and vhost devices can be preserved during cpr-transfer using
traditional live migration methods, wherein the management layer
creates new interfaces for the target and fiddles with 'ip link'
to deactivate the old interface and activate the new.
However, CPR can simply send the file descriptors to new QEMU,
with no special management actions required. The user enables
this behavior by specifing '-netdev tap,cpr=on'. The default
is cpr=off.
Signed-off-by: Ben Chaney <[email protected]>
Hi!
I'd like to note again, that I'mvworking on an alternative solution for
live-updating
virtio-net+TAP, passing FDs through unix domain socket, which:
1. Doesn't require second migration channel
2. Doesn't use CPR: the whole TAP state, including negotiated parameters
and opened FD are natively passed as usual migration state structure.
(look here:
https://lore.kernel.org/qemu-devel/[email protected]/
)
3. Still should be compatible with CPR, and may be used in context of CPR-update
The latest version was
[PATCH v9 0/8] virtio-net: live-TAP local migration
https://lore.kernel.org/qemu-devel/[email protected]/
and I plan to post v10 soon.
--
Best regards,
Vladimir
