virtio: Don't ignore initialization failures

Don't ignore an error in the bus specific initialization function in
virtio_init; don't ignore the result of virtio_init; and don't return 0
in virtio_bl

virtio: Don't ignore initialization failures

Don't ignore an error in the bus specific initialization function in
virtio_init; don't ignore the result of virtio_init; and don't return 0
in virtio_blk__init and virtio_scsi__init when we encounter an error.
Hopefully this will save some developer's time debugging faulty virtio
devices in a guest.

To take advantage of the cleanup function virtio_blk__exit, move appending
the new device to the list before the call to virtio_init. Change
virtio_net__exit to free all allocated net_dev devices on exit, and
matching what virtio_blk__exit does.

To safeguard against this in the future, virtio_init has been annoted
with the compiler attribute warn_unused_result.

Reviewed-by: Andre Przywara <andre.przywara@arm.com>
Signed-off-by: Alexandru Elisei <alexandru.elisei@arm.com>
Signed-off-by: Will Deacon <will@kernel.org>

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kvm tools: Add initial virtio-scsi support

This patch brings virito-scsi support to kvm tool.

With the introduce of tcm_vhost (vhost-scsi)

tcm_vhost: Initial merge for vhost level target fabric

kvm tools: Add initial virtio-scsi support

This patch brings virito-scsi support to kvm tool.

With the introduce of tcm_vhost (vhost-scsi)

tcm_vhost: Initial merge for vhost level target fabric driver

we can implement virito-scsi by simply having vhost-scsi to handle the
SCSI command.

Howto use:
1) Setup the tcm_vhost target through /sys/kernel/config

[Stefan Hajnoczi, Thanks for the script to setup tcm_vhost]

** Setup wwpn and tpgt
$ wwpn="naa.0"
$ tpgt=/sys/kernel/config/target/vhost/$wwpn/tpgt_0
$ nexus=$tpgt/nexus
$ mkdir -p $tpgt
$ echo -n $wwpn > $nexus

** Setup lun using /dev/ram
$ n=0
$ lun=$tpgt/lun/lun_${n}
$ data=/sys/kernel/config/target/core/iblock_0/data_${n}
$ ram=/dev/ram${n}
$ mkdir -p $lun
$ mkdir -p $data
$ echo -n udev_path=${ram} > $data/control
$ echo -n 1 > $data/enable
$ ln -s $data $lun

2) Run kvm tool with the new disk option '-d scsi:$wwpn:$tpgt', e.g
$ lkvm run -k /boot/bzImage -d ~/img/sid.img -d scsi:naa.0:0

Signed-off-by: Asias He <asias.hejun@gmail.com>
Cc: Nicholas A. Bellinger <nab@linux-iscsi.org>
Cc: Stefan Hajnoczi <stefanha@linux.vnet.ibm.com>
Cc: Paolo Bonzini <pbonzini@redhat.com>
Signed-off-by: Pekka Enberg <penberg@kernel.org>

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kvm tools: prevent the redefined error

In file included from ../../include/linux/stddef.h:4:0,
from ../../include/linux/list.h:5,
from include/kvm/framebuffer.h:5,

kvm tools: prevent the redefined error

In file included from ../../include/linux/stddef.h:4:0,
from ../../include/linux/list.h:5,
from include/kvm/framebuffer.h:5,
from builtin-run.c:8:
include/linux/compiler.h:8:0: error: "__attribute_const__" redefined [-Werror]
/usr/include/sys/cdefs.h:226:0: note: this is the location of the previous definition
cc1: all warnings being treated as errors

make: *** [builtin-run.o] Error 1

Signed-off-by: Wanlong Gao <gaowanlong@cn.fujitsu.com>
Signed-off-by: Pekka Enberg <penberg@kernel.org>

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kvm tools: Use kernel error check functions

Add compiler.h file to support using kernel error check funciotns(e.g
ERR_PTR, PTR_ERR and so on).

Signed-off-by: Lan Tianyu <tianyu.lan@intel.com>
Signe

kvm tools: Use kernel error check functions

Add compiler.h file to support using kernel error check funciotns(e.g
ERR_PTR, PTR_ERR and so on).

Signed-off-by: Lan Tianyu <tianyu.lan@intel.com>
Signed-off-by: Pekka Enberg <penberg@kernel.org>

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kvm: Add KVM ABI headers

This patch adds KVM ABI headers to the source tree. We can no longer include
<linux/kvm.h> directly because someone added a "#warning" to <linux/types.h>
that prevents kerne

kvm: Add KVM ABI headers

This patch adds KVM ABI headers to the source tree. We can no longer include
<linux/kvm.h> directly because someone added a "#warning" to <linux/types.h>
that prevents kernel header inclusion from userspace.

We can switch back to using kernel headers if we ever make it to Linux
mainline.

Signed-off-by: Pekka Enberg <penberg@kernel.org>

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