virtio-blk: Account for failed and invalid operations

Signed-off-by: Alberto Garcia <berto@igalia.com>
Message-id: 4f623ce52c9d673d35a043fc2959526b41b685c6.1446044838.git.berto@igalia.com
Signed-off

virtio-blk: Account for failed and invalid operations

Signed-off-by: Alberto Garcia <berto@igalia.com>
Message-id: 4f623ce52c9d673d35a043fc2959526b41b685c6.1446044838.git.berto@igalia.com
Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com>
Signed-off-by: Kevin Wolf <kwolf@redhat.com>

show more ...

Merge remote-tracking branch 'remotes/stefanha/tags/block-pull-request' into staging

# gpg: Signature made Thu 29 Oct 2015 18:09:16 GMT using RSA key ID 81AB73C8
# gpg: Good signature from "Stefan H

Merge remote-tracking branch 'remotes/stefanha/tags/block-pull-request' into staging

# gpg: Signature made Thu 29 Oct 2015 18:09:16 GMT using RSA key ID 81AB73C8
# gpg: Good signature from "Stefan Hajnoczi <stefanha@redhat.com>"
# gpg: aka "Stefan Hajnoczi <stefanha@gmail.com>"

* remotes/stefanha/tags/block-pull-request:
block: Consider all child nodes in bdrv_requests_pending()
target-arm: xlnx-zynqmp: Add sdhci support.
sdhci: Split sdhci.h for public and internal device usage
sd.h: Move sd.h to include/hw/sd/
virtio: sync the dataplane vring state to the virtqueue before virtio_save
gdb command: qemu handlers
virtio-blk: switch off scsi-passthrough by default
ppc/spapr: add 2.4 compat props
s390x: include HW_COMPAT_* props
qemu-gdb: add $qemu_coroutine_sp and $qemu_coroutine_pc
qemu-gdb: extract parts of "qemu coroutine" implementation
qemu-gdb: allow using glibc_pointer_guard() on core dumps

Signed-off-by: Peter Maydell <peter.maydell@linaro.org>

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virtio: sync the dataplane vring state to the virtqueue before virtio_save

When creating snapshot with the dataplane enabled, the snapshot file gets
not the actual state of virtqueue, because the cu

virtio: sync the dataplane vring state to the virtqueue before virtio_save

When creating snapshot with the dataplane enabled, the snapshot file gets
not the actual state of virtqueue, because the current state is stored in
VirtIOBlockDataPlane. Therefore, before saving snapshot need to sync
the dataplane vring state to the virtqueue. The dataplane will resume its
work at the next notify virtqueue.

When snapshot loads with loadvm we get a message:
VQ 0 size 0x80 Guest index 0x15f5 inconsistent with Host index 0x0:
delta 0x15f5
error while loading state for instance 0x0 of device
'0000:00:08.0/virtio-blk'
Error -1 while loading VM state

to reproduce the error I used the following hmp commands:
savevm snap1
loadvm snap1

qemu parameters:
--enable-kvm -smp 4 -m 1024 -drive file=/var/lib/libvirt/images/centos6.4.qcow2,if=none,id=drive-virtio-disk0,format=qcow2,cache=none,aio=native -device virtio-blk-pci,scsi=off,bus=pci.0,addr=0x8,drive=drive-virtio-disk0,id=virtio-disk0 -set device.virtio-disk0.x-data-plane=on

Signed-off-by: Pavel Butsykin <pbutsykin@virtuozzo.com>
Signed-off-by: Denis V. Lunev <den@openvz.org>
Message-id: 1445859777-2982-1-git-send-email-den@openvz.org
CC: Stefan Hajnoczi <stefanha@redhat.com>
CC: "Michael S. Tsirkin" <mst@redhat.com>
CC: Kevin Wolf <kwolf@redhat.com>
CC: Paolo Bonzini <pbonzini@redhat.com>
Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com>

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virtio-blk: switch off scsi-passthrough by default

Devices that are compliant with virtio-1 do not support scsi
passthrough any more (and it has not been a recommended setup
anyway for quite some ti

virtio-blk: switch off scsi-passthrough by default

Devices that are compliant with virtio-1 do not support scsi
passthrough any more (and it has not been a recommended setup
anyway for quite some time). To avoid having to switch it off
explicitly in newer qemus that turn on virtio-1 by default, let's
switch the default to scsi=false for 2.5.

Signed-off-by: Cornelia Huck <cornelia.huck@de.ibm.com>
Message-id: 1444991154-79217-4-git-send-email-cornelia.huck@de.ibm.com
Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com>

show more ...

Merge remote-tracking branch 'remotes/mst/tags/for_upstream' into staging

virtio, pc, memory: fixes+features for 2.5

New features:
This enables hotplug for multifunction devices.
Patches ar

Merge remote-tracking branch 'remotes/mst/tags/for_upstream' into staging

virtio, pc, memory: fixes+features for 2.5

New features:
This enables hotplug for multifunction devices.
Patches are very small, so I think it's OK to merge
at this stage.

There's also some new infrastructure for vhost-user testing
not enabled yet so it's harmless to merge.

I've reverted the "gap between DIMMs" workaround, as it seems too risky, and
applied my own patch in virtio, but not in dataplane code. This means that
dataplane is broken for some complex DIMM configurations for now. Waiting for
Stefan to review the dataplane fix.

Signed-off-by: Michael S. Tsirkin <mst@redhat.com>

# gpg: Signature made Thu 29 Oct 2015 09:36:16 GMT using RSA key ID D28D5469
# gpg: Good signature from "Michael S. Tsirkin <mst@kernel.org>"
# gpg: aka "Michael S. Tsirkin <mst@redhat.com>"

* remotes/mst/tags/for_upstream:
enable multi-function hot-add
remove function during multi-function hot-add
tests/vhost-user-bridge: add vhost-user bridge application
Revert "memhp: extend address auto assignment to support gaps"
Revert "pc: memhp: force gaps between DIMM's GPA"
virtio: drop virtqueue_map_sg
virtio-scsi: convert to virtqueue_map
virtio-serial: convert to virtio_map
virtio-blk: convert to virtqueue_map
virtio: switch to virtio_map
virtio: introduce virtio_map
mmap-alloc: fix error handling
pc: memhp: do not emit inserting event for coldplugged DIMMs
vhost-user-test: fix up rhel6 build
vhost-user: cleanup msg size math
vhost-user: cleanup struct size math

Signed-off-by: Peter Maydell <peter.maydell@linaro.org>

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virtio-blk: convert to virtqueue_map

Drop deprecated use of virtqueue_map_sg.

Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
Reviewed-by: Igor Mammedov <imammedo@redhat.com>

Merge remote-tracking branch 'remotes/stefanha/tags/block-pull-request' into staging

Pull request

v2:
* Fix virtio 16lx -> HWADDR_PRIx format specifier [Peter]

# gpg: Signature made Mon 12 Oct 20

Merge remote-tracking branch 'remotes/stefanha/tags/block-pull-request' into staging

Pull request

v2:
* Fix virtio 16lx -> HWADDR_PRIx format specifier [Peter]

# gpg: Signature made Mon 12 Oct 2015 11:19:06 BST using RSA key ID 81AB73C8
# gpg: Good signature from "Stefan Hajnoczi <stefanha@redhat.com>"
# gpg: aka "Stefan Hajnoczi <stefanha@gmail.com>"

* remotes/stefanha/tags/block-pull-request:
sdhci.c: Limit the maximum block size
block: switch from g_slice allocator to malloc
virtio dataplane: adapt dataplane for virtio Version 1
virtio-blk: use blk_io_plug/unplug for Linux AIO batching
sdhci: Pass drive parameter to sdhci-pci via qdev property

Signed-off-by: Peter Maydell <peter.maydell@linaro.org>

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block: switch from g_slice allocator to malloc

Simplify memory allocation by sticking with a single API. GSlice
is not that fast anyway (tcmalloc/jemalloc are better).

Signed-off-by: Paolo Bonzini

block: switch from g_slice allocator to malloc

Simplify memory allocation by sticking with a single API. GSlice
is not that fast anyway (tcmalloc/jemalloc are better).

Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com>

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virtio-blk: use blk_io_plug/unplug for Linux AIO batching

The raw-posix block driver implements Linux AIO batching so multiple
requests can be submitted with a single io_submit(2) system call.
Batch

virtio-blk: use blk_io_plug/unplug for Linux AIO batching

The raw-posix block driver implements Linux AIO batching so multiple
requests can be submitted with a single io_submit(2) system call.
Batching is currently only used by virtio-scsi and
virtio-blk-data-plane.

Enable batching for regular virtio-blk so the number of io_submit(2)
system calls is reduced for workloads with queue depth > 1.

In 4KB random read performance tests with queue depth 32, the CPU
utilization on the host is reduced by 9.4%. The fio job is as follows:

[global]
bs=4k
ioengine=libaio
iodepth=32
direct=1
sync=0
time_based=1
runtime=30
clocksource=gettimeofday
ramp_time=5

[job1]
rw=randread
filename=/dev/vdb
size=4096M
write_bw_log=fio
write_iops_log=fio
write_lat_log=fio
log_avg_msec=1000

This benchmark was run on an raw image on LVM. The disk was an SSD
drive and -drive cache=none,aio=native was used.

Tested-by: Pradeep Surisetty <psuriset@redhat.com>
Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com>
Reviewed-by: Fam Zheng <famz@redhat.com>

show more ...

Merge remote-tracking branch 'remotes/mst/tags/for_upstream' into staging

virtio,pc,acpi fixes, cleanups

Fixes all over the place.

Signed-off-by: Michael S. Tsirkin <mst@redhat.com>

# gpg: Signat

Merge remote-tracking branch 'remotes/mst/tags/for_upstream' into staging

virtio,pc,acpi fixes, cleanups

Fixes all over the place.

Signed-off-by: Michael S. Tsirkin <mst@redhat.com>

# gpg: Signature made Thu 10 Sep 2015 10:16:18 BST using RSA key ID D28D5469
# gpg: Good signature from "Michael S. Tsirkin <mst@kernel.org>"
# gpg: aka "Michael S. Tsirkin <mst@redhat.com>"

* remotes/mst/tags/for_upstream:
hw/pci: fix pci_update_mappings() trace events
pc: memhotplug: keep reserved-memory-end broken on 2.4 and earlier machines
pc: memhotplug: fix incorrectly set reserved-memory-end
acpi: Remove unused definition.
virtio: avoid leading underscores for helpers
pc: Remove redundant arguments from xen_hvm_init()
pci: Fix pci_device_iommu_address_space() bus propagation

Signed-off-by: Peter Maydell <peter.maydell@linaro.org>

show more ...

virtio: avoid leading underscores for helpers

Commit ef546f1275f6563e8934dd5e338d29d9f9909ca6 ("virtio: add
feature checking helpers") introduced a helper __virtio_has_feature.
We don't want to use

virtio: avoid leading underscores for helpers

Commit ef546f1275f6563e8934dd5e338d29d9f9909ca6 ("virtio: add
feature checking helpers") introduced a helper __virtio_has_feature.
We don't want to use reserved identifiers, though, so let's
rename __virtio_has_feature to virtio_has_feature and virtio_has_feature
to virtio_vdev_has_feature.

Signed-off-by: Cornelia Huck <cornelia.huck@de.ibm.com>
Reviewed-by: Michael S. Tsirkin <mst@redhat.com>
Signed-off-by: Michael S. Tsirkin <mst@redhat.com>

show more ...

Merge remote-tracking branch 'remotes/mst/tags/for_upstream' into staging

virtio fixes for 2.4

Mostly virtio 1 spec compliance fixes.
We are unlikely to make it perfectly compliant in
the first rel

Merge remote-tracking branch 'remotes/mst/tags/for_upstream' into staging

virtio fixes for 2.4

Mostly virtio 1 spec compliance fixes.
We are unlikely to make it perfectly compliant in
the first release, but it seems worth it to try.

Signed-off-by: Michael S. Tsirkin <mst@redhat.com>

# gpg: Signature made Mon Jul 27 21:55:48 2015 BST using RSA key ID D28D5469
# gpg: Good signature from "Michael S. Tsirkin <mst@kernel.org>"
# gpg: aka "Michael S. Tsirkin <mst@redhat.com>"

* remotes/mst/tags/for_upstream:
virtio: minor cleanup
acpi: fix pvpanic device is not shown in ui
virtio-blk: only clear VIRTIO_F_ANY_LAYOUT for legacy device
virtio-blk: fail get_features when both scsi and 1.0 were set
virtio: get_features() can fail
virtio-pci: fix memory MR cleanup for modern
virtio: set any_layout in virtio core
virtio-9p: fix any_layout
virtio-serial: fix ANY_LAYOUT
virtio: hide legacy features from modern guests

Signed-off-by: Peter Maydell <peter.maydell@linaro.org>

show more ...

virtio: minor cleanup

There's no need for blk to set ANY_LAYOUT, it's
done by virtio core as necessary.

Signed-off-by: Michael S. Tsirkin <mst@redhat.com>

virtio-blk: only clear VIRTIO_F_ANY_LAYOUT for legacy device

Chapter 6.3 of spec said

"
Transitional devices MUST offer, and if offered by the device
transitional drivers MUST accept the following:

virtio-blk: only clear VIRTIO_F_ANY_LAYOUT for legacy device

Chapter 6.3 of spec said

"
Transitional devices MUST offer, and if offered by the device
transitional drivers MUST accept the following:

VIRTIO_F_ANY_LAYOUT (27)
"

So this patch only clear VIRTIO_F_LAYOUT for legacy device.

Cc: Stefan Hajnoczi <stefanha@redhat.com>
Cc: Kevin Wolf <kwolf@redhat.com>
Cc: qemu-block@nongnu.org
Signed-off-by: Jason Wang <jasowang@redhat.com>
Reviewed-by: Michael S. Tsirkin <mst@redhat.com>
Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
Acked-by: Paolo Bonzini <pbonzini@redhat.com>

show more ...

virtio-blk: fail get_features when both scsi and 1.0 were set

SCSI passthrough was no longer supported in virtio 1.0, so this patch
fail the get_features() when both 1.0 and scsi is set. And also on

virtio-blk: fail get_features when both scsi and 1.0 were set

SCSI passthrough was no longer supported in virtio 1.0, so this patch
fail the get_features() when both 1.0 and scsi is set. And also only
advertise VIRTIO_BLK_F_SCSI for legacy virtio-blk device.

Signed-off-by: Jason Wang <jasowang@redhat.com>
Reviewed-by: Michael S. Tsirkin <mst@redhat.com>
Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
Acked-by: Paolo Bonzini <pbonzini@redhat.com>

show more ...

virtio: get_features() can fail

Signed-off-by: Jason Wang <jasowang@redhat.com>
Reviewed-by: Michael S. Tsirkin <mst@redhat.com>
Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
Acked-by: Paolo Bo

virtio: get_features() can fail

Signed-off-by: Jason Wang <jasowang@redhat.com>
Reviewed-by: Michael S. Tsirkin <mst@redhat.com>
Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
Acked-by: Paolo Bonzini <pbonzini@redhat.com>

show more ...

virtio: set any_layout in virtio core

Exceptions:
- virtio-blk
- compat machine types

Signed-off-by: Michael S. Tsirkin <mst@redhat.com>

Merge remote-tracking branch 'remotes/stefanha/tags/block-pull-request' into staging

# gpg: Signature made Wed Jun 24 16:27:53 2015 BST using RSA key ID 81AB73C8
# gpg: Good signature from "Stefan H

Merge remote-tracking branch 'remotes/stefanha/tags/block-pull-request' into staging

# gpg: Signature made Wed Jun 24 16:27:53 2015 BST using RSA key ID 81AB73C8
# gpg: Good signature from "Stefan Hajnoczi <stefanha@redhat.com>"
# gpg: aka "Stefan Hajnoczi <stefanha@gmail.com>"

* remotes/stefanha/tags/block-pull-request:
virito-blk: drop duplicate check
qemu-iotests: fix 051.out after qdev error message change
iov: don't touch iov in iov_send_recv()
raw-posix: Introduce hdev_is_sg()
raw-posix: Use DPRINTF for DEBUG_FLOPPY
raw-posix: DPRINTF instead of DEBUG_BLOCK_PRINT
Fix migration in case of scsi-generic
block: Use bdrv_is_sg() everywhere
nvme: Fix memleak in nvme_dma_read_prp
vvfat: add a label option
util/hbitmap: Add an API to reset all set bits in hbitmap
virtio-blk: Use blk_drain() to drain IO requests
block-backend: Introduce blk_drain()
throttle: Check current timers before updating any_timer_armed[]
block: Let bdrv_drain_all() to call aio_poll() for each AioContext

Signed-off-by: Peter Maydell <peter.maydell@linaro.org>

show more ...

virito-blk: drop duplicate check

in_num = req->elem.in_num, and req->elem.in_num is
checked in line 489, so the check about in_num variable
is superflous, let's drop it.

Signed-off-by: Gonglei <are

virito-blk: drop duplicate check

in_num = req->elem.in_num, and req->elem.in_num is
checked in line 489, so the check about in_num variable
is superflous, let's drop it.

Signed-off-by: Gonglei <arei.gonglei@huawei.com>
Reviewed-by: Fam Zheng <famz@redhat.com>
Message-id: 1435138164-11728-1-git-send-email-arei.gonglei@huawei.com
Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com>

show more ...

virtio-blk: Use blk_drain() to drain IO requests

Each call of the virtio_blk_reset() function calls blk_drain_all(),
which works for all existing BlockDriverStates, while draining only
one is needed

virtio-blk: Use blk_drain() to drain IO requests

Each call of the virtio_blk_reset() function calls blk_drain_all(),
which works for all existing BlockDriverStates, while draining only
one is needed.

This patch replaces blk_drain_all() by blk_drain() in
virtio_blk_reset(). virtio_blk_data_plane_stop() should be called
after draining because it restores vblk->complete_request.

Cc: "Michael S. Tsirkin" <mst@redhat.com>
Cc: Christian Borntraeger <borntraeger@de.ibm.com>
Cc: Cornelia Huck <cornelia.huck@de.ibm.com>
Cc: Kevin Wolf <kwolf@redhat.com>
Cc: Paolo Bonzini <pbonzini@redhat.com>
Cc: Stefan Hajnoczi <stefanha@redhat.com>
Signed-off-by: Alexander Yarygin <yarygin@linux.vnet.ibm.com>
Message-id: 1434537440-28236-3-git-send-email-yarygin@linux.vnet.ibm.com
Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com>

show more ...

Merge remote-tracking branch 'remotes/mst/tags/for_upstream' into staging

pc, pci, tpm, virtio, vhost enhancements and fixes

A bunch of cleanups and fixes all over the place,
enhancements in TPM, v

Merge remote-tracking branch 'remotes/mst/tags/for_upstream' into staging

pc, pci, tpm, virtio, vhost enhancements and fixes

A bunch of cleanups and fixes all over the place,
enhancements in TPM, virtio and vhost.

Signed-off-by: Michael S. Tsirkin <mst@redhat.com>

# gpg: Signature made Mon Jun 1 13:19:48 2015 BST using RSA key ID D28D5469
# gpg: Good signature from "Michael S. Tsirkin <mst@kernel.org>"
# gpg: aka "Michael S. Tsirkin <mst@redhat.com>"

* remotes/mst/tags/for_upstream: (60 commits)
vhost-user: add multi queue support
virtio: make features 64bit wide
qdev: add 64bit properties
virtio-mmio: ioeventfd support
hw/acpi/aml-build: Fix memory leak
acpi: add aml_while() term
acpi: add aml_increment() term
acpi: add aml_shiftright() term
acpi: add aml_shiftleft() term
acpi: add aml_index() term
acpi: add aml_lless() term
acpi: add aml_add() term
TPM2 ACPI table support
tpm: Probe for connected TPM 1.2 or TPM 2
Extend TPM TIS interface to support TPM 2
Add stream ID to MSI write
acpi: Simplify printing to dynamic string
i386: drop FDC in pc-q35-2.4+ if neither it nor floppy drives are wanted
i386/pc_q35: don't insist on board FDC if there's no default floppy
i386/pc: '-drive if=floppy' should imply a board-default FDC
...

Signed-off-by: Peter Maydell <peter.maydell@linaro.org>

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virtio: make features 64bit wide

Make features 64bit wide everywhere.

On migration a full 64bit guest_features field is sent if one of the
high bits is set, in addition to the lower 32bit guest_fea

virtio: make features 64bit wide

Make features 64bit wide everywhere.

On migration a full 64bit guest_features field is sent if one of the
high bits is set, in addition to the lower 32bit guest_features field
which must stay for compatibility reasons. That way we send the lower
32 feature bits twice, but the code is simpler because we don't have
to split and compose the 64bit features into two 32bit fields.

Signed-off-by: Gerd Hoffmann <kraxel@redhat.com>
Reviewed-by: Michael S. Tsirkin <mst@redhat.com>
Signed-off-by: Michael S. Tsirkin <mst@redhat.com>

show more ...

Merge remote-tracking branch 'remotes/mjt/tags/pull-trivial-patches-2015-04-30' into staging

trivial patches for 2015-04-30

# gpg: Signature made Thu Apr 30 14:07:50 2015 BST using RSA key ID A4C3D

Merge remote-tracking branch 'remotes/mjt/tags/pull-trivial-patches-2015-04-30' into staging

trivial patches for 2015-04-30

# gpg: Signature made Thu Apr 30 14:07:50 2015 BST using RSA key ID A4C3D7DB
# gpg: Good signature from "Michael Tokarev <mjt@tls.msk.ru>"
# gpg: aka "Michael Tokarev <mjt@corpit.ru>"
# gpg: aka "Michael Tokarev <mjt@debian.org>"

* remotes/mjt/tags/pull-trivial-patches-2015-04-30: (42 commits)
openrisc: cpu: Remove unused cpu_get_pc
microblaze: fix memory leak
tcg: Delete unused cpu_pc_from_tb()
kvm: Silence warning from valgrind
vhost-user: remove superfluous '\n' around error_report()
target-mips: fix memory leak
qmp-commands: Fix typo
linux-user/elfload: use QTAILQ_FOREACH instead of open-coding it
coroutine: remove unnecessary parentheses in qemu_co_queue_empty
qemu-char: remove unused list node from FDCharDriver
input: remove unused mouse_handlers list
cpus: use first_cpu macro instead of QTAILQ_FIRST(&cpus)
microblaze: cpu: delete unused cpu_interrupts_enabled
microblaze: cpu: Renumber EXCP_* constants to close gap
microblaze: cpu: Delete EXCP_NMI
microblaze: cpu: Remove unused CC_OP enum
microblaze: cpu: Remote unused cpu_get_pc
microblaze: mmu: Delete flip_um fn prototype
defconfigs: Piggyback microblazeel on microblaze
libcacard: do not use full paths for include files in the same dir
...

Signed-off-by: Peter Maydell <peter.maydell@linaro.org>

show more ...

misc: Fix new collection of typos

All of them were reported by codespell.
Most typos are in comments, one is in an error message.

Signed-off-by: Stefan Weil <sw@weilnetz.de>
Reviewed-by: Peter Mayd

misc: Fix new collection of typos

All of them were reported by codespell.
Most typos are in comments, one is in an error message.

Signed-off-by: Stefan Weil <sw@weilnetz.de>
Reviewed-by: Peter Maydell <peter.maydell@linaro.org>
Reviewed-by: Stefan Hajnoczi <stefanha@redhat.com>
Signed-off-by: Michael Tokarev <mjt@tls.msk.ru>

show more ...

Merge remote-tracking branch 'remotes/stefanha/tags/block-pull-request' into staging

# gpg: Signature made Thu Apr 9 10:55:11 2015 BST using RSA key ID 81AB73C8
# gpg: Good signature from "Stefan H

Merge remote-tracking branch 'remotes/stefanha/tags/block-pull-request' into staging

# gpg: Signature made Thu Apr 9 10:55:11 2015 BST using RSA key ID 81AB73C8
# gpg: Good signature from "Stefan Hajnoczi <stefanha@redhat.com>"
# gpg: aka "Stefan Hajnoczi <stefanha@gmail.com>"

* remotes/stefanha/tags/block-pull-request:
block/iscsi: handle zero events from iscsi_which_events
aio: strengthen memory barriers for bottom half scheduling
virtio-blk: correctly dirty guest memory
qcow2: Fix header update with overridden backing file

Signed-off-by: Peter Maydell <peter.maydell@linaro.org>

show more ...