[RFC v2 00/10] Add vduse live migration features

Eugenio Pérez
2026-03-10T19:16:55Z

This series introduces features to the VDUSE (vDPA Device in Userspace) driver
to support Live Migration.

Currently, DPDK does not support VDUSE devices live migration because the
driver lacks a mechanism to suspend the device and quiesce the rings to
initiate the switchover. This series implements the suspend operation to
address this limitation.

Furthermore, enabling Live Migration for devices with control virtqueue needs
two additional features. Both of them are included in this series.

* Address Spaces (ASID) support: This allows QEMU to isolate and intercept the
device's CVQ. By doing so, QEMU is able to migrate the device status
transparently, without requiring the device to support state save and
restore.
* QUEUE_ENABLE: This allows QEMU to control when the dataplane virtqueues are
enabled. This ensures the dataplane is started after the device
configuration has been fully restores via the CVQ.

Last but not least, it enables the VIRTIO_NET_F_STATUS feature. This allows the
device to signal the driver that it needs to send gratuitous ARP with
VIRTIO_NET_S_ANNOUNCE, reducing the Live Migration downtime.

v2:
* Following latest comments on kernel series about VDUSE features, not checking
API version but only check if VDUSE_GET_FEATURES success.
* Move the start and last declarations in the braces as gcc 8 does not like
them interleaved with statements. Actually, I think the move was a mistake in
the first version.
https://mails.dpdk.org/archives/test-report/2026-February/958175.html

Eugenio Pérez (1):
uapi: align VDUSE header for ASID

Maxime Coquelin (6):
vhost: introduce ASID support
vhost: add VDUSE API version negotiation
vhost: add virtqueues groups support to VDUSE
vhost: add ASID support to VDUSE IOTLB operations
vhost: claim VDUSE support for API version 1
vhost: add net status feature to VDUSE

Super User (3):
uapi: Align vduse.h for enable and suspend VDUSE messages
vhost: Support VDUSE QUEUE_READY feature
vhost: Support vduse suspend feature

kernel/linux/uapi/linux/vduse.h | 114 +++++++++++++++-
lib/vhost/iotlb.c | 226 ++++++++++++++++++++------------
lib/vhost/iotlb.h | 14 +-
lib/vhost/vduse.c | 197 +++++++++++++++++++++++++---
lib/vhost/vduse.h | 3 +-
lib/vhost/vhost.c | 16 +--
lib/vhost/vhost.h | 16 +--
lib/vhost/vhost_user.c | 11 +-
8 files changed, 460 insertions(+), 137 deletions(-)

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2.53.0