linux/drivers/vhost, branch v3.9

Merge git://git.kernel.org/pub/scm/linux/kernel/git/nab/target-pending

2013-04-12T22:26:42Z

Pull SCSI target fixes from Nicholas Bellinger: "Here are remaining target-pending items for v3.9-rc7 code. The tcm_vhost patches are more than I'd usually include in a -rc7 pull, but are changes required for v3.9 to work correctly with the pending vhost-scsi-pci QEMU upstream series merge. (Paolo CC'ed) Plus Asias's conversion to use vhost_virtqueue->private_data + RCU for managing vhost-scsi endpoints has gotten alot of review + testing over the past weeks, and MST has ACKed the full series. Also, there is a target patch to fix a long-standing bug within control CDB handling with Standby/Offline/Transition ALUA port access states, that had been incorrectly rejecting the control CDBs required for LUN scan to work during these port group states. CC'ing to stable." * git://git.kernel.org/pub/scm/linux/kernel/git/nab/target-pending: target: Fix incorrect fallthrough of ALUA Standby/Offline/Transition CDBs tcm_vhost: Send bad target to guest when cmd fails tcm_vhost: Add vhost_scsi_send_bad_target() helper tcm_vhost: Fix tv_cmd leak in vhost_scsi_handle_vq tcm_vhost: Remove double check of response tcm_vhost: Initialize vq->last_used_idx when set endpoint tcm_vhost: Use vq->private_data to indicate if the endpoint is setup tcm_vhost: Use ACCESS_ONCE for vs->vs_tpg[target] access

tcm_vhost: Send bad target to guest when cmd fails

2013-04-11T08:48:42Z

Send bad target to guest in case: 1) we can not allocate the cmd 2) fail to submit the cmd Signed-off-by: Asias He Acked-by: Michael S. Tsirkin Signed-off-by: Nicholas Bellinger

tcm_vhost: Add vhost_scsi_send_bad_target() helper

2013-04-11T08:48:35Z

Share the send bad target code with other use cases. Signed-off-by: Asias He Acked-by: Michael S. Tsirkin Signed-off-by: Nicholas Bellinger

tcm_vhost: Fix tv_cmd leak in vhost_scsi_handle_vq

2013-04-11T08:48:27Z

If we fail to submit the allocated tv_vmd to tcm_vhost_submission_work, we will leak the tv_vmd. Free tv_vmd on fail path. Signed-off-by: Asias He Acked-by: Michael S. Tsirkin Signed-off-by: Nicholas Bellinger

tcm_vhost: Remove double check of response

2013-04-11T08:48:11Z

We did the length of response check twice. Signed-off-by: Asias He Acked-by: Michael S. Tsirkin Signed-off-by: Nicholas Bellinger

tcm_vhost: Initialize vq->last_used_idx when set endpoint

2013-04-08T21:09:54Z

This patch fixes guest hang when booting seabios and guest. [ 0.576238] scsi0 : Virtio SCSI HBA [ 0.616754] virtio_scsi virtio1: request:id 0 is not a head! vq->last_used_idx is initialized only when /dev/vhost-scsi is opened or closed. vhost_scsi_open -> vhost_dev_init() -> vhost_vq_reset() vhost_scsi_release() -> vhost_dev_cleanup -> vhost_vq_reset() So, when guest talks to tcm_vhost after seabios does, vq->last_used_idx still contains the old valule for seabios. This confuses guest. Fix this by calling vhost_init_used() to init vq->last_used_idx when we set endpoint. Signed-off-by: Asias He Acked-by: Michael S. Tsirkin Signed-off-by: Nicholas Bellinger

tcm_vhost: Use vq->private_data to indicate if the endpoint is setup

2013-04-08T21:07:00Z

Currently, vs->vs_endpoint is used indicate if the endpoint is setup or not. It is set or cleared in vhost_scsi_set_endpoint() or vhost_scsi_clear_endpoint() under the vs->dev.mutex lock. However, when we check it in vhost_scsi_handle_vq(), we ignored the lock. Instead of using the vs->vs_endpoint and the vs->dev.mutex lock to indicate the status of the endpoint, we use per virtqueue vq->private_data to indicate it. In this way, we can only take the vq->mutex lock which is per queue and make the concurrent multiqueue process having less lock contention. Further, in the read side of vq->private_data, we can even do not take the lock if it is accessed in the vhost worker thread, because it is protected by "vhost rcu". (nab: Do s/VHOST_FEATURES/~VHOST_SCSI_FEATURES) Signed-off-by: Asias He Acked-by: Michael S. Tsirkin Signed-off-by: Nicholas Bellinger

tcm_vhost: Use ACCESS_ONCE for vs->vs_tpg[target] access

2013-04-02T23:43:34Z

In vhost_scsi_handle_vq: tv_tpg = vs->vs_tpg[target]; if (!tv_tpg) { .... return } tv_cmd = vhost_scsi_allocate_cmd(tv_tpg, &v_req, 1) vs->vs_tpg[target] might change after the NULL check and 2) the above line might access tv_tpg from vs->vs_tpg[target]. To prevent 2), use ACCESS_ONCE. Thanks mst for catching this up! Signed-off-by: Asias He Acked-by: Michael S. Tsirkin Signed-off-by: Nicholas Bellinger

Merge git://git.kernel.org/pub/scm/linux/kernel/git/nab/target-pending

2013-03-30T20:13:05Z

Pull SCSI target fixes from Nicholas Bellinger: "This includes the bug-fix for a >= v3.8-rc1 regression specific to iscsi-target persistent reservation conflict handling (CC'ed to stable), and a tcm_vhost patch to drop VIRTIO_RING_F_EVENT_IDX usage so that in-flight qemu vhost-scsi-pci device code can detect the proper vhost feature bits. Also, there are two more tcm_vhost patches still being discussed by MST and Asias for v3.9 that will be required for the in-flight qemu vhost-scsi-pci device patch to function properly, and that should (hopefully) be the last target fixes for this round." * git://git.kernel.org/pub/scm/linux/kernel/git/nab/target-pending: target: Fix RESERVATION_CONFLICT status regression for iscsi-target special case tcm_vhost: Avoid VIRTIO_RING_F_EVENT_IDX feature bit

tcm_vhost: Avoid VIRTIO_RING_F_EVENT_IDX feature bit

2013-03-29T06:42:47Z

This patch adds a VHOST_SCSI_FEATURES mask minus VIRTIO_RING_F_EVENT_IDX so that vhost-scsi-pci userspace will strip this feature bit once GET_FEATURES reports it as being unsupported on the host. This is to avoid a bug where ->handle_kicks() are missed when EVENT_IDX is enabled by default in userspace code. (mst: Rename to VHOST_SCSI_FEATURES + add comment) Acked-by: Michael S. Tsirkin Reviewed-by: Asias He Cc: Paolo Bonzini Signed-off-by: Nicholas Bellinger