linux.git/drivers/vhost, branch v3.6-rc2

tcm_vhost: Initial merge for vhost level target fabric driver

2012-07-29T20:49:10+00:00

This patch adds the initial code for tcm_vhost, a Vhost level TCM
fabric driver for virtio SCSI initiators into KVM guest.

This code is currently up and running on v3.5-rc2 host+guest
from target-pending/for-next-merge.

Using tcm_vhost requires Zhi's -> Stefan -> nab's qemu vhost-scsi tree here:

  http://git.kernel.org/?p=virt/kvm/nab/qemu-kvm.git;a=shortlog;h=refs/heads/vhost-scsi

--

Changelog v4 -> v5:

  Expose ABI version via VHOST_SCSI_GET_ABI_VERSION + use Rev 0 as
  starting point for v3.6-rc code (Stefan + ALiguori + nab)
  Convert vhost_scsi_handle_vq() to vq_err() (nab + MST)
  Minor style fixes from checkpatch (nab)

Changelog v3 -> v4:

  Rename vhost_vring_target -> vhost_scsi_target (mst + nab)
  Use TRANSPORT_IQN_LEN in vhost_scsi_target->vhost_wwpn[] def (nab)
  Move back to drivers/vhost/, and just use drivers/vhost/Kconfig.tcm (mst)
  Move TCM_VHOST related ioctl defines from include/linux/vhost.h ->
  drivers/vhost/tcm_vhost.h as requested by MST (nab)
  Move Kbuild.tcm include from drivers/staging -> drivers/vhost/, and
  just use 'if STAGING' around 'source drivers/vhost/Kbuild.tcm'

Changelog v2 -> v3:

  Unlock on error in tcm_vhost_drop_nexus() (DanC)
  Fix strlen() doesn't count the terminator (DanC)
  Call kfree() on an error path (DanC)
  Convert tcm_vhost_write_pending to use target_execute_cmd (hch + nab)
  Fix another strlen() off by one in tcm_vhost_make_tport (DanC)
  Add option under drivers/staging/Kconfig, and move to drivers/vhost/tcm/
  as requested by MST (nab)

Changelog v1 -> v2:

  Fix tv_cmd completion -> release SGL memory leak (nab)
  Fix sparse warnings for static variable usage ((Fengguang Wu)
  Fix sparse warnings for min() typing + printk format specs (Fengguang Wu)
  Convert to cmwq submission for I/O dispatch (nab + hch)

Changelog v0 -> v1:

  Merge into single source + header file, and move to drivers/vhost/

Acked-by: Michael S. Tsirkin 
Cc: Stefan Hajnoczi 
Cc: Anthony Liguori 
Cc: Zhi Yong Wu 
Cc: Paolo Bonzini 
Cc: Christoph Hellwig 
Cc: Hannes Reinecke 
Cc: Jens Axboe 
Signed-off-by: Nicholas Bellinger

vhost: make vhost work queue visible

2012-07-21T22:22:23+00:00

The vhost work queue allows processing to be done in vhost worker thread
context, which uses the owner process mm.  Access to the vring and guest
memory is typically only possible from vhost worker context so it is
useful to allow work to be queued directly by users.

Currently vhost_net only uses the poll wrappers which do not expose the
work queue functions.  However, for tcm_vhost (vhost_scsi) it will be
necessary to queue custom work.

Signed-off-by: Stefan Hajnoczi 
Cc: Zhi Yong Wu 
Cc: Michael S. Tsirkin 
Cc: Paolo Bonzini 
Signed-off-by: Nicholas Bellinger 
Signed-off-by: Michael S. Tsirkin

vhost: Separate vhost-net features from vhost features

2012-07-21T22:21:53+00:00

In order for other vhost devices to use the VHOST_FEATURES bits the
vhost-net specific bits need to be moved to their own VHOST_NET_FEATURES
constant.

(Asias: Update drivers/vhost/test.c to use VHOST_NET_FEATURES)

Signed-off-by: Stefan Hajnoczi 
Cc: Zhi Yong Wu 
Cc: Michael S. Tsirkin 
Cc: Paolo Bonzini 
Cc: Asias He 
Signed-off-by: Nicholas A. Bellinger 
Signed-off-by: Michael S. Tsirkin

vhost: use USER_DS in vhost_worker thread

2012-06-27T04:10:56+00:00

On some architectures address spaces are set up in a way that this is
not necessary to work properly but on some others (like s390) it is.
Make sure we operate on the user address space to allow copy_xxx_user()
from the vhost_worker() thread by setting it explicitly before calling
use_mm() and revert it after unuse_mm().

Signed-off-by: Jens Freimann 
Signed-off-by: Christian Borntraeger 
Acked-by: Michael S. Tsirkin 
Signed-off-by: David S. Miller

Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/net

2012-05-17T02:17:37+00:00

vhost-net: fix handle_rx buffer size

2012-05-11T22:16:57+00:00

Take vlan header length into account, when vlan id is stored as
vlan_tci. Otherwise tagged packets coming from macvtap will be
truncated.

Signed-off-by: Basil Gor 
Acked-by: Michael S. Tsirkin 
Signed-off-by: David S. Miller

vhost: zerocopy: poll vq in zerocopy callback

2012-05-02T15:22:25+00:00

We add used and signal guest in worker thread but did not poll the virtqueue
during the zero copy callback. This may lead the missing of adding and
signalling during zerocopy. Solve this by polling the virtqueue and let it
wakeup the worker during callback.

Signed-off-by: Jason Wang 
Signed-off-by: Michael S. Tsirkin

vhost_net: zerocopy: adding and signalling immediately when fully copied

2012-05-02T15:22:24+00:00

When a packet were fully copied in zerocopy, we don't wait for the DMA done to
mark the done flag, so after the packet were passed to lower device, we need to
add used and signal guest immediately.

Signed-off-by: Jason Wang 
Signed-off-by: Michael S. Tsirkin

vhost_net: re-poll only on EAGAIN or ENOBUFS

2012-05-02T15:22:24+00:00

Currently, we restart tx polling unconditionally when sendmsg()
fails. This would cause unnecessary wakeups of vhost wokers and waste
cpu utlization when evil userspace(guest driver) is able to hit EFAULT or
EINVAL.

The polling is only needed when the socket send buffer were exceeded or not
enough memory. So fix this by restarting polling only when sendmsg() returns
EAGAIN/ENOBUFS.

Signed-off-by: Jason Wang 
Signed-off-by: Michael S. Tsirkin

vhost_net: zerocopy: fix possible NULL pointer dereference of vq->bufs

2012-05-02T15:22:22+00:00

When we want to disable vhost_net backend while there's a tx work, a possible
NULL pointer defernece may happen we we try to deference the vq->bufs after
vhost_net_set_backend() assign a NULL to it.

As suggested by Michael, fix this by checking the vq->bufs instead of
vhost_sock_zcopy().

Signed-off-by: Michael S. Tsirkin