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. v4: * Sync headers with Linux's latest existing and proposed UAPI. Both files constants and new ioctl VDUSE_SET_FEATURES. * Check for more error conditions and clarified some error messages in ready message processing. * Add relevant release notes. * Fix cosmetic whitespaces & checkpath errors. * Fix error path of vhost_user_iotlb_init and vhost_user_iotlb_init_one. * Fix commits author. v3: * Replace incorrect '%lx' DEBUG print format specifier with PRIx64 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 (4): uapi: align VDUSE header for ASID vhost: Support VDUSE QUEUE_READY feature vhost: Support vduse suspend feature doc: add release notes for VDUSE live migration support Maxime Coquelin (7): 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 uapi: Align vduse.h for enable and suspend VDUSE messages doc/guides/rel_notes/release_26_07.rst | 17 ++ kernel/linux/uapi/linux/vduse.h | 121 ++++++++++++- lib/vhost/iotlb.c | 233 +++++++++++++++---------- lib/vhost/iotlb.h | 14 +- lib/vhost/vduse.c | 212 ++++++++++++++++++++-- lib/vhost/vduse.h | 3 +- lib/vhost/vhost.c | 16 +- lib/vhost/vhost.h | 16 +- lib/vhost/vhost_user.c | 13 +- 9 files changed, 503 insertions(+), 142 deletions(-) -- 2.55.0
