[v3] Live update: tap and vhost

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

Ben Chaney posted 8 patches 1 week, 3 days ago

Diff against v2 v3
Download series mbox

Patches applied successfully (tree, apply log)
git fetch https://github.com/patchew-project/qemu tags/patchew/20251203-cpr-tap-v3-0-3cc89e9b19e4@akamai.com

Maintainers: "Michael S. Tsirkin" <mst@redhat.com>, Jason Wang <jasowang@redhat.com>, Alex Williamson <alex@shazbot.org>, "Cédric Le Goater" <clg@redhat.com>, Stefano Garzarella <sgarzare@redhat.com>, Peter Xu <peterx@redhat.com>, Fabiano Rosas <farosas@suse.de>, "Daniel P. Berrangé" <berrange@redhat.com>, Stefan Weil <sw@weilnetz.de>, Eric Blake <eblake@redhat.com>, Markus Armbruster <armbru@redhat.com>, Paolo Bonzini <pbonzini@redhat.com>

There is a newer version of this series

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(-)

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

Posted by Ben Chaney 1 week, 3 days ago

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,
-- 
Ben Chaney <bchaney@akamai.com>