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. 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 | 118 ++++++++++++++++- lib/vhost/iotlb.c | 226 ++++++++++++++++++++------------ lib/vhost/iotlb.h | 14 +- lib/vhost/vduse.c | 208 ++++++++++++++++++++++++++--- lib/vhost/vduse.h | 3 +- lib/vhost/vhost.c | 16 +-- lib/vhost/vhost.h | 16 +-- lib/vhost/vhost_user.c | 11 +- 8 files changed, 475 insertions(+), 137 deletions(-) -- 2.53.0
