Re: [PATCH v3 0/8] Live update: tap and vhost

["Cédric Le Goater" <clg@redhat.com>]

Hello,

Ben, Mark,

Since Steve retired, we have generic names under the "CheckPoint and
Restart (CPR)" entry in MAINTAINERS. Would you be willing to step forward
as Reviewers/Maintainers ?

Also, do you have a gitlab account so we can copy you on any reported
issues [1] ?

Thanks,

C.

[1] https://gitlab.com/qemu-project/qemu/-/issues/3235



On 12/3/25 19:51, Ben Chaney wrote:
> Changes since v2
> - I have taken over this patch set since Steve retired
> - Added comments to explain the order of events
> - Remove redundant reversion to cleanup git history
> - Inclusion of virtio and stub fixes
> 
> 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 <bchaney@akamai.com>
> ---
> Steve Sistare (8):
>        migration: stop vm earlier for cpr
>        migration: cpr setup notifier
>        vhost: reset vhost devices for cpr
>        cpr: delete all fds
>        tap: common return label
>        tap: cpr support
>        tap: postload fix for cpr
>        tap: cpr fixes
> 
>   hw/net/virtio-net.c               |  26 +++++++
>   hw/vfio/device.c                  |   2 +-
>   hw/virtio/vhost-backend.c         |   6 ++
>   hw/virtio/vhost.c                 |  32 +++++++++
>   include/hw/virtio/vhost-backend.h |   1 +
>   include/hw/virtio/vhost.h         |   1 +
>   include/migration/cpr.h           |   3 +-
>   include/net/tap.h                 |   1 +
>   io/channel-socket.c               |   4 +-
>   migration/cpr.c                   |  24 +++++--
>   migration/migration.c             |  69 ++++++++++++++----
>   net/tap-win32.c                   |   5 ++
>   net/tap.c                         | 147 +++++++++++++++++++++++++++++---------
>   qapi/net.json                     |   5 +-
>   stubs/cpr.c                       |   8 +++
>   stubs/meson.build                 |   1 +
>   16 files changed, 279 insertions(+), 56 deletions(-)
> ---
> base-commit: 9febfa94b69b7146582c48a868bd2330ac45037f
> change-id: 20251203-cpr-tap-04fd811ace03
> 
> Best regards,