Implement stop operation for vdpa_sim devices, so vhost-vdpa will offer that backend feature and userspace can effectively stop the device. This is a must before get virtqueue indexes (base) for live migration, since the device could modify them after userland gets them. There are individual ways to perform that action for some devices (VHOST_NET_SET_BACKEND, VHOST_VSOCK_SET_RUNNING, ...) but there was no way to perform it for any vhost device (and, in particular, vhost-vdpa). Comments are welcome. Eugenio Pérez (4): vdpa: Add stop operation vhost-vdpa: introduce STOP backend feature bit vhost-vdpa: uAPI to stop the device vdpa_sim: Implement stop vdpa op drivers/vdpa/vdpa_sim/vdpa_sim.c | 21 +++++++++++++++++++ drivers/vdpa/vdpa_sim/vdpa_sim.h | 1 + drivers/vdpa/vdpa_sim/vdpa_sim_net.c | 3 +++ drivers/vhost/vdpa.c | 31 ++++++++++++++++++++++++++++ include/linux/vdpa.h | 6 ++++++ include/uapi/linux/vhost.h | 3 +++ include/uapi/linux/vhost_types.h | 2 ++ 7 files changed, 67 insertions(+) -- 2.27.0
