Merge tag 'for-upstream' of https://repo.or.cz/qemu/kevin into staging

Block layer patches

- virtio-blk: use blk_io_plug_call() instead of notification BH
- mirror: allow switching from background

Merge tag 'for-upstream' of https://repo.or.cz/qemu/kevin into staging

Block layer patches

- virtio-blk: use blk_io_plug_call() instead of notification BH
- mirror: allow switching from background to active mode
- qemu-img rebase: add compression support
- Fix locking in media change monitor commands
- Fix a few blockjob-related deadlocks when using iothread

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# gpg: Good signature from "Kevin Wolf <kwolf@redhat.com>" [full]
# Primary key fingerprint: DC3D EB15 9A9A F95D 3D74 56FE 7F09 B272 C88F 2FD6

* tag 'for-upstream' of https://repo.or.cz/qemu/kevin: (27 commits)
iotests: add test for changing mirror's copy_mode
mirror: return mirror-specific information upon query
blockjob: query driver-specific info via a new 'query' driver method
qapi/block-core: turn BlockJobInfo into a union
qapi/block-core: use JobType for BlockJobInfo's type
mirror: implement mirror_change method
block/mirror: determine copy_to_target only once
block/mirror: move dirty bitmap to filter
block/mirror: set actively_synced even after the job is ready
blockjob: introduce block-job-change QMP command
virtio-blk: remove batch notification BH
virtio: use defer_call() in virtio_irqfd_notify()
util/defer-call: move defer_call() to util/
block: rename blk_io_plug_call() API to defer_call()
blockdev: mirror: avoid potential deadlock when using iothread
block: avoid potential deadlock during bdrv_graph_wrlock() in bdrv_close()
blockjob: drop AioContext lock before calling bdrv_graph_wrlock()
iotests: Test media change with iothreads
block: Fix locking in media change monitor commands
iotests: add tests for "qemu-img rebase" with compression
...

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

show more ...

virtio: use defer_call() in virtio_irqfd_notify()

virtio-blk and virtio-scsi invoke virtio_irqfd_notify() to send Used
Buffer Notifications from an IOThread. This involves an eventfd
write(2) syscal

virtio: use defer_call() in virtio_irqfd_notify()

virtio-blk and virtio-scsi invoke virtio_irqfd_notify() to send Used
Buffer Notifications from an IOThread. This involves an eventfd
write(2) syscall. Calling this repeatedly when completing multiple I/O
requests in a row is wasteful.

Use the defer_call() API to batch together virtio_irqfd_notify() calls
made during thread pool (aio=threads), Linux AIO (aio=native), and
io_uring (aio=io_uring) completion processing.

Behavior is unchanged for emulated devices that do not use
defer_call_begin()/defer_call_end() since defer_call() immediately
invokes the callback when called outside a
defer_call_begin()/defer_call_end() region.

fio rw=randread bs=4k iodepth=64 numjobs=8 IOPS increases by ~9% with a
single IOThread and 8 vCPUs. iodepth=1 decreases by ~1% but this could
be noise. Detailed performance data and configuration specifics are
available here:
https://gitlab.com/stefanha/virt-playbooks/-/tree/blk_io_plug-irqfd

This duplicates the BH that virtio-blk uses for batching. The next
commit will remove it.

Reviewed-by: Eric Blake <eblake@redhat.com>
Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com>
Message-ID: <20230913200045.1024233-4-stefanha@redhat.com>
Reviewed-by: Michael S. Tsirkin <mst@redhat.com>
Reviewed-by: Kevin Wolf <kwolf@redhat.com>
Signed-off-by: Kevin Wolf <kwolf@redhat.com>

show more ...

Merge tag 'for-upstream' of https://repo.or.cz/qemu/kevin into staging

Block layer patches

- Graph locking part 4 (node management)
- qemu-img map: report compressed data blocks
- block-backend: pr

Merge tag 'for-upstream' of https://repo.or.cz/qemu/kevin into staging

Block layer patches

- Graph locking part 4 (node management)
- qemu-img map: report compressed data blocks
- block-backend: process I/O in the current AioContext

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# gpg: issuer "kwolf@redhat.com"
# gpg: Good signature from "Kevin Wolf <kwolf@redhat.com>" [full]
# Primary key fingerprint: DC3D EB15 9A9A F95D 3D74 56FE 7F09 B272 C88F 2FD6

* tag 'for-upstream' of https://repo.or.cz/qemu/kevin: (28 commits)
block: mark aio_poll as non-coroutine
block-backend: process zoned requests in the current AioContext
block-backend: process I/O in the current AioContext
test-bdrv-drain: avoid race with BH in IOThread drain test
block: remove AIOCBInfo->get_aio_context()
qemu-img: map: report compressed data blocks
block: add BDRV_BLOCK_COMPRESSED flag for bdrv_block_status()
block: Mark bdrv_add/del_child() and caller GRAPH_WRLOCK
block: Mark bdrv_unref_child() GRAPH_WRLOCK
block: Mark bdrv_root_unref_child() GRAPH_WRLOCK
block: Take graph rdlock in bdrv_change_aio_context()
block: Take graph rdlock in bdrv_drop_intermediate()
block: Mark bdrv_parent_cb_change_media() GRAPH_RDLOCK
block: Mark bdrv_child_perm() GRAPH_RDLOCK
block: Mark bdrv_get_cumulative_perm() and callers GRAPH_RDLOCK
block: Mark bdrv_parent_perms_conflict() and callers GRAPH_RDLOCK
block: Mark bdrv_attach_child() GRAPH_WRLOCK
block: Call transaction callbacks with lock held
block: Mark bdrv_attach_child_common() GRAPH_WRLOCK
block: Mark bdrv_replace_child_tran() GRAPH_WRLOCK
...

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

show more ...

block: remove AIOCBInfo->get_aio_context()

The synchronous bdrv_aio_cancel() function needs the acb's AioContext so
it can call aio_poll() to wait for cancellation.

It turns out that all users run

block: remove AIOCBInfo->get_aio_context()

The synchronous bdrv_aio_cancel() function needs the acb's AioContext so
it can call aio_poll() to wait for cancellation.

It turns out that all users run under the BQL in the main AioContext, so
this callback is not needed.

Remove the callback, mark bdrv_aio_cancel() GLOBAL_STATE_CODE just like
its blk_aio_cancel() caller, and poll the main loop AioContext.

The purpose of this cleanup is to identify bdrv_aio_cancel() as an API
that does not work with the multi-queue block layer.

Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com>
Message-ID: <20230912231037.826804-2-stefanha@redhat.com>
Reviewed-by: Kevin Wolf <kwolf@redhat.com>
Reviewed-by: Eric Blake <eblake@redhat.com>
Reviewed-by: Klaus Jensen <k.jensen@samsung.com>
Signed-off-by: Kevin Wolf <kwolf@redhat.com>

show more ...

Merge tag 'pull-xen-20230801' of https://xenbits.xen.org/git-http/people/aperard/qemu-dm into staging

Misc fixes, for thread-pool, xen, and xen-emulate

* fix an access to `request_cond` QemuCond in

Merge tag 'pull-xen-20230801' of https://xenbits.xen.org/git-http/people/aperard/qemu-dm into staging

Misc fixes, for thread-pool, xen, and xen-emulate

* fix an access to `request_cond` QemuCond in thread-pool
* fix issue with PCI devices when unplugging IDE devices in Xen guest
* several fixes for issues pointed out by Coverity

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# gpg: Signature made Tue 01 Aug 2023 02:38:47 AM PDT
# gpg: using RSA key F80C006308E22CFD8A92E7980CF5572FD7FB55AF
# gpg: Good signature from "Anthony PERARD <anthony.perard@gmail.com>" [unknown]
# gpg: aka "Anthony PERARD <anthony.perard@citrix.com>" [unknown]
# gpg: WARNING: This key is not certified with a trusted signature!
# gpg: There is no indication that the signature belongs to the owner.
# Primary key fingerprint: 5379 2F71 024C 600F 778A 7161 D8D5 7199 DF83 42C8
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* tag 'pull-xen-20230801' of https://xenbits.xen.org/git-http/people/aperard/qemu-dm:
xen-platform: do full PCI reset during unplug of IDE devices
xen: Don't pass MemoryListener around by value
thread-pool: signal "request_cond" while locked
xen-block: Avoid leaks on new error path
hw/xen: Clarify (lack of) error handling in transaction_commit()

Signed-off-by: Richard Henderson <richard.henderson@linaro.org>

show more ...

thread-pool: signal "request_cond" while locked

thread_pool_free() might have been called on the `pool`, which would
be a reason for worker_thread() to quit. In this case,
`pool->request_cond` is be

thread-pool: signal "request_cond" while locked

thread_pool_free() might have been called on the `pool`, which would
be a reason for worker_thread() to quit. In this case,
`pool->request_cond` is been destroyed.

If worker_thread() didn't managed to signal `request_cond` before it
been destroyed by thread_pool_free(), we got:
util/qemu-thread-posix.c:198: qemu_cond_signal: Assertion `cond->initialized' failed.

One backtrace:
__GI___assert_fail (assertion=0x55555614abcb "cond->initialized", file=0x55555614ab88 "util/qemu-thread-posix.c", line=198,
function=0x55555614ad80 <__PRETTY_FUNCTION__.17104> "qemu_cond_signal") at assert.c:101
qemu_cond_signal (cond=0x7fffb800db30) at util/qemu-thread-posix.c:198
worker_thread (opaque=0x7fffb800dab0) at util/thread-pool.c:129
qemu_thread_start (args=0x7fffb8000b20) at util/qemu-thread-posix.c:505
start_thread (arg=<optimized out>) at pthread_create.c:486

Reported here:
https://lore.kernel.org/all/ZJwoK50FcnTSfFZ8@MacBook-Air-de-Roger.local/T/#u

To avoid issue, keep lock while sending a signal to `request_cond`.

Fixes: 900fa208f506 ("thread-pool: replace semaphore with condition variable")
Signed-off-by: Anthony PERARD <anthony.perard@citrix.com>
Reviewed-by: Stefan Hajnoczi <stefanha@redhat.com>
Message-Id: <20230714152720.5077-1-anthony.perard@citrix.com>
Signed-off-by: Anthony PERARD <anthony.perard@citrix.com>

show more ...

Merge tag 'for-upstream' of https://repo.or.cz/qemu/kevin into staging

Block layer patches

- Protect BlockBackend.queued_requests with its own lock
- Switch to AIO_WAIT_WHILE_UNLOCKED() where possi

Merge tag 'for-upstream' of https://repo.or.cz/qemu/kevin into staging

Block layer patches

- Protect BlockBackend.queued_requests with its own lock
- Switch to AIO_WAIT_WHILE_UNLOCKED() where possible
- AioContext removal: LinuxAioState/LuringState/ThreadPool
- Add more coroutine_fn annotations, use bdrv/blk_co_*
- Fix crash when execute hmp_commit

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# gpg: Signature made Tue 25 Apr 2023 02:12:29 PM BST
# gpg: using RSA key DC3DEB159A9AF95D3D7456FE7F09B272C88F2FD6
# gpg: issuer "kwolf@redhat.com"
# gpg: Good signature from "Kevin Wolf <kwolf@redhat.com>" [full]

* tag 'for-upstream' of https://repo.or.cz/qemu/kevin: (25 commits)
block/monitor: Fix crash when executing HMP commit
vmdk: make vmdk_is_cid_valid a coroutine_fn
qcow2: mark various functions as coroutine_fn and GRAPH_RDLOCK
tests: mark more coroutine_fns
qemu-pr-helper: mark more coroutine_fns
9pfs: mark more coroutine_fns
nbd: mark more coroutine_fns, do not use co_wrappers
mirror: make mirror_flush a coroutine_fn, do not use co_wrappers
blkdebug: add missing coroutine_fn annotation
vvfat: mark various functions as coroutine_fn
thread-pool: avoid passing the pool parameter every time
thread-pool: use ThreadPool from the running thread
io_uring: use LuringState from the running thread
linux-aio: use LinuxAioState from the running thread
block: add missing coroutine_fn to bdrv_sum_allocated_file_size()
include/block: fixup typos
monitor: convert monitor_cleanup() to AIO_WAIT_WHILE_UNLOCKED()
hmp: convert handle_hmp_command() to AIO_WAIT_WHILE_UNLOCKED()
block: convert bdrv_drain_all_begin() to AIO_WAIT_WHILE_UNLOCKED()
block: convert bdrv_graph_wrlock() to AIO_WAIT_WHILE_UNLOCKED()
...

Signed-off-by: Richard Henderson <richard.henderson@linaro.org>

show more ...

thread-pool: avoid passing the pool parameter every time

thread_pool_submit_aio() is always called on a pool taken from
qemu_get_current_aio_context(), and that is the only intended
use: each pool r

thread-pool: avoid passing the pool parameter every time

thread_pool_submit_aio() is always called on a pool taken from
qemu_get_current_aio_context(), and that is the only intended
use: each pool runs only in the same thread that is submitting
work to it, it can't run anywhere else.

Therefore simplify the thread_pool_submit* API and remove the
ThreadPool function parameter.

Signed-off-by: Emanuele Giuseppe Esposito <eesposit@redhat.com>
Message-Id: <20230203131731.851116-5-eesposit@redhat.com>
Reviewed-by: Kevin Wolf <kwolf@redhat.com>
Reviewed-by: Stefan Hajnoczi <stefanha@redhat.com>
Signed-off-by: Kevin Wolf <kwolf@redhat.com>

show more ...

thread-pool: use ThreadPool from the running thread

Use qemu_get_current_aio_context() where possible, since we always
submit work to the current thread anyways.

We want to also be sure that the th

thread-pool: use ThreadPool from the running thread

Use qemu_get_current_aio_context() where possible, since we always
submit work to the current thread anyways.

We want to also be sure that the thread submitting the work is
the same as the one processing the pool, to avoid adding
synchronization to the pool list.

Signed-off-by: Emanuele Giuseppe Esposito <eesposit@redhat.com>
Message-Id: <20230203131731.851116-4-eesposit@redhat.com>
Reviewed-by: Kevin Wolf <kwolf@redhat.com>
Reviewed-by: Stefan Hajnoczi <stefanha@redhat.com>
Signed-off-by: Kevin Wolf <kwolf@redhat.com>

show more ...

Merge tag 'for-upstream' of https://gitlab.com/bonzini/qemu into staging

* ac97 cleanups (Zoltan)
* default the amount of prealloc-threads to smp-cpus (Jaroslav)
* fix disabling MPX on "-cpu host" w

Merge tag 'for-upstream' of https://gitlab.com/bonzini/qemu into staging

* ac97 cleanups (Zoltan)
* default the amount of prealloc-threads to smp-cpus (Jaroslav)
* fix disabling MPX on "-cpu host" with MPX-capable host (Maciej)
* thread-pool performance optimizations (myself)
* Hyper-V enlightenment enabling and docs (Vitaly)
* check ELF header in elf2dmp (Viktor)
* tweak LBREn migration (Weijiang)

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# gpg: Signature made Wed 25 May 2022 12:27:04 PM PDT
# gpg: using RSA key F13338574B662389866C7682BFFBD25F78C7AE83
# gpg: issuer "pbonzini@redhat.com"
# gpg: Good signature from "Paolo Bonzini <bonzini@gnu.org>" [undefined]
# gpg: aka "Paolo Bonzini <pbonzini@redhat.com>" [undefined]
# gpg: WARNING: This key is not certified with a trusted signature!
# gpg: There is no indication that the signature belongs to the owner.
# Primary key fingerprint: 46F5 9FBD 57D6 12E7 BFD4 E2F7 7E15 100C CD36 69B1
# Subkey fingerprint: F133 3857 4B66 2389 866C 7682 BFFB D25F 78C7 AE83

* tag 'for-upstream' of https://gitlab.com/bonzini/qemu:
i386: docs: Convert hyperv.txt to rST
i386: Hyper-V Direct TLB flush hypercall
i386: Hyper-V Support extended GVA ranges for TLB flush hypercalls
i386: Hyper-V XMM fast hypercall input feature
i386: Hyper-V Enlightened MSR bitmap feature
i386: Use hv_build_cpuid_leaf() for HV_CPUID_NESTED_FEATURES
ide_ioport_read: Return lower octet of data register instead of 0xFF
target/i386/kvm: Fix disabling MPX on "-cpu host" with MPX-capable host
hw/audio/ac97: Remove unneeded local variables
hw/audio/ac97: Remove unimplemented reset functions
hw/audio/ac97: Coding style fixes to avoid checkpatch errors
contrib/elf2dmp: add ELF dump header checking
thread-pool: remove stopping variable
thread-pool: replace semaphore with condition variable
thread-pool: optimize scheduling of completion bottom half
hostmem: default the amount of prealloc-threads to smp-cpus
target/i386: Remove LBREn bit check when access Arch LBR MSRs

Signed-off-by: Richard Henderson <richard.henderson@linaro.org>

show more ...

thread-pool: remove stopping variable

Just setting the max threads to 0 is enough to stop all workers.

Message-Id: <20220514065012.1149539-4-pbonzini@redhat.com>
Reviewed-by: Stefan Hajnoczi <stefa

thread-pool: remove stopping variable

Just setting the max threads to 0 is enough to stop all workers.

Message-Id: <20220514065012.1149539-4-pbonzini@redhat.com>
Reviewed-by: Stefan Hajnoczi <stefanha@redhat.com>
Reviewed-by: Nicolas Saenz Julienne <nsaenzju@redhat.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>

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thread-pool: replace semaphore with condition variable

Since commit f9fc8932b1 ("thread-posix: remove the posix semaphore
support", 2022-04-06) QemuSemaphore has its own mutex and condition
variable

thread-pool: replace semaphore with condition variable

Since commit f9fc8932b1 ("thread-posix: remove the posix semaphore
support", 2022-04-06) QemuSemaphore has its own mutex and condition
variable; this adds unnecessary overhead on I/O with small block sizes.

Check the QTAILQ directly instead of adding the indirection of a
semaphore's count. Using a semaphore has not been necessary since
qemu_cond_timedwait was introduced; the new code has to be careful about
spurious wakeups but it is simpler, for example thread_pool_cancel does
not have to worry about synchronizing the semaphore count with the number
of elements of pool->request_list.

Note that the return value of qemu_cond_timedwait (0 for timeout, 1 for
signal or spurious wakeup) is different from that of qemu_sem_timedwait
(-1 for timeout, 0 for success).

Reported-by: Lukáš Doktor <ldoktor@redhat.com>
Suggested-by: Stefan Hajnoczi <stefanha@redhat.com>
Reviewed-by: Nicolas Saenz Julienne <nsaenzju@redhat.com>
Message-Id: <20220514065012.1149539-3-pbonzini@redhat.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>

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thread-pool: optimize scheduling of completion bottom half

The completion bottom half was scheduled within the pool->lock
critical section. That actually results in worse performance,
because the w

thread-pool: optimize scheduling of completion bottom half

The completion bottom half was scheduled within the pool->lock
critical section. That actually results in worse performance,
because the worker thread can run its own small critical section
and go to sleep before the bottom half starts running.

Note that this simple change does not produce an improvement without
changing the thread pool QemuSemaphore to a condition variable.

Reviewed-by: Stefan Hajnoczi <stefanha@redhat.com>
Reviewed-by: Nicolas Saenz Julienne <nsaenzju@redhat.com>
Message-Id: <20220514065012.1149539-2-pbonzini@redhat.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>

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Merge tag 'block-pull-request' of https://gitlab.com/stefanha/qemu into staging

Pull request

- Add new thread-pool-min/thread-pool-max parameters to control the thread pool
used for async I/O.

-

Merge tag 'block-pull-request' of https://gitlab.com/stefanha/qemu into staging

Pull request

- Add new thread-pool-min/thread-pool-max parameters to control the thread pool
used for async I/O.

- Fix virtio-scsi IOThread 100% CPU consumption QEMU 7.0 regression.

# -----BEGIN PGP SIGNATURE-----
#
# iQEzBAABCAAdFiEEhpWov9P5fNqsNXdanKSrs4Grc8gFAmJ5DqgACgkQnKSrs4Gr
# c8iAqAf/WEJzEso0Hu3UUYJi2lAXpLxWPjoNBlPdQlKIJ/I0zQIF0P7GeCifF+0l
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# NJNBg5Ldszwj4PDZ1dFU3/03aigb3g==
# =t5eR
# -----END PGP SIGNATURE-----
# gpg: Signature made Mon 09 May 2022 05:52:56 AM PDT
# gpg: using RSA key 8695A8BFD3F97CDAAC35775A9CA4ABB381AB73C8
# gpg: Good signature from "Stefan Hajnoczi <stefanha@redhat.com>" [full]
# gpg: aka "Stefan Hajnoczi <stefanha@gmail.com>" [full]

* tag 'block-pull-request' of https://gitlab.com/stefanha/qemu:
virtio-scsi: move request-related items from .h to .c
virtio-scsi: clean up virtio_scsi_handle_cmd_vq()
virtio-scsi: clean up virtio_scsi_handle_ctrl_vq()
virtio-scsi: clean up virtio_scsi_handle_event_vq()
virtio-scsi: don't waste CPU polling the event virtqueue
virtio-scsi: fix ctrl and event handler functions in dataplane mode
util/event-loop-base: Introduce options to set the thread pool size
util/main-loop: Introduce the main loop into QOM
Introduce event-loop-base abstract class

Signed-off-by: Richard Henderson <richard.henderson@linaro.org>

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util/event-loop-base: Introduce options to set the thread pool size

The thread pool regulates itself: when idle, it kills threads until
empty, when in demand, it creates new threads until full. This

util/event-loop-base: Introduce options to set the thread pool size

The thread pool regulates itself: when idle, it kills threads until
empty, when in demand, it creates new threads until full. This behaviour
doesn't play well with latency sensitive workloads where the price of
creating a new thread is too high. For example, when paired with qemu's
'-mlock', or using safety features like SafeStack, creating a new thread
has been measured take multiple milliseconds.

In order to mitigate this let's introduce a new 'EventLoopBase'
property to set the thread pool size. The threads will be created during
the pool's initialization or upon updating the property's value, remain
available during its lifetime regardless of demand, and destroyed upon
freeing it. A properly characterized workload will then be able to
configure the pool to avoid any latency spikes.

Signed-off-by: Nicolas Saenz Julienne <nsaenzju@redhat.com>
Reviewed-by: Stefan Hajnoczi <stefanha@redhat.com>
Acked-by: Markus Armbruster <armbru@redhat.com>
Message-id: 20220425075723.20019-4-nsaenzju@redhat.com
Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com>

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

Pull request

v2:
* Fixed stray slirp submodule change [Peter]

Fixes for the lock guard macros, code conversion

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

Pull request

v2:
* Fixed stray slirp submodule change [Peter]

Fixes for the lock guard macros, code conversions to the lock guard macros, and
support for selecting fuzzer targets with argv[0].

# gpg: Signature made Mon 04 May 2020 16:11:11 BST
# gpg: using RSA key 8695A8BFD3F97CDAAC35775A9CA4ABB381AB73C8
# gpg: Good signature from "Stefan Hajnoczi <stefanha@redhat.com>" [full]
# gpg: aka "Stefan Hajnoczi <stefanha@gmail.com>" [full]
# Primary key fingerprint: 8695 A8BF D3F9 7CDA AC35 775A 9CA4 ABB3 81AB 73C8

* remotes/stefanha/tags/block-pull-request:
lockable: Replace locks with lock guard macros
lockable: replaced locks with lock guard macros where appropriate
lockable: fix __COUNTER__ macro to be referenced properly
fuzz: select fuzz target using executable name

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

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lockable: replaced locks with lock guard macros where appropriate

- ran regexp "qemu_mutex_lock\(.*\).*\n.*if" to find targets
- replaced result with QEMU_LOCK_GUARD if all unlocks at function end
-

lockable: replaced locks with lock guard macros where appropriate

- ran regexp "qemu_mutex_lock\(.*\).*\n.*if" to find targets
- replaced result with QEMU_LOCK_GUARD if all unlocks at function end
- replaced result with WITH_QEMU_LOCK_GUARD if unlock not at end

Signed-off-by: Daniel Brodsky <dnbrdsky@gmail.com>
Reviewed-by: Juan Quintela <quintela@redhat.com>
Message-id: 20200404042108.389635-3-dnbrdsky@gmail.com
Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com>

show more ...

Merge remote-tracking branch 'remotes/armbru/tags/pull-misc-2019-06-11-v3' into staging

Miscellaneous patches for 2019-06-11

# gpg: Signature made Wed 12 Jun 2019 12:20:41 BST
# gpg:

Merge remote-tracking branch 'remotes/armbru/tags/pull-misc-2019-06-11-v3' into staging

Miscellaneous patches for 2019-06-11

# gpg: Signature made Wed 12 Jun 2019 12:20:41 BST
# gpg: using RSA key 354BC8B3D7EB2A6B68674E5F3870B400EB918653
# gpg: issuer "armbru@redhat.com"
# gpg: Good signature from "Markus Armbruster <armbru@redhat.com>" [full]
# gpg: aka "Markus Armbruster <armbru@pond.sub.org>" [full]
# Primary key fingerprint: 354B C8B3 D7EB 2A6B 6867 4E5F 3870 B400 EB91 8653

* remotes/armbru/tags/pull-misc-2019-06-11-v3:
MAINTAINERS: Polish headline decorations
MAINTAINERS: Improve section headlines
MAINTAINERS: Remove duplicate entries of qemu-devel@nongnu.org
Clean up a header guard symbols (again)
Supply missing header guards
Clean up a few header guard symbols
scripts/clean-header-guards: Fix handling of trailing comments
Normalize position of header guard
Include qemu-common.h exactly where needed
Include qemu/module.h where needed, drop it from qemu-common.h
qemu-common: Move qemu_isalnum() etc. to qemu/ctype.h
qemu-common: Move tcg_enabled() etc. to sysemu/tcg.h

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

show more ...

Include qemu-common.h exactly where needed

No header includes qemu-common.h after this commit, as prescribed by
qemu-common.h's file comment.

Signed-off-by: Markus Armbruster <armbru@redhat.com>
Me

Include qemu-common.h exactly where needed

No header includes qemu-common.h after this commit, as prescribed by
qemu-common.h's file comment.

Signed-off-by: Markus Armbruster <armbru@redhat.com>
Message-Id: <20190523143508.25387-5-armbru@redhat.com>
[Rebased with conflicts resolved automatically, except for
include/hw/arm/xlnx-zynqmp.h hw/arm/nrf51_soc.c hw/arm/msf2-soc.c
block/qcow2-refcount.c block/qcow2-cluster.c block/qcow2-cache.c
target/arm/cpu.h target/lm32/cpu.h target/m68k/cpu.h target/mips/cpu.h
target/moxie/cpu.h target/nios2/cpu.h target/openrisc/cpu.h
target/riscv/cpu.h target/tilegx/cpu.h target/tricore/cpu.h
target/unicore32/cpu.h target/xtensa/cpu.h; bsd-user/main.c and
net/tap-bsd.c fixed up]

show more ...

Merge remote-tracking branch 'remotes/kevin/tags/for-upstream' into staging

Block layer fixes for 2.9.0-rc1

# gpg: Signature made Fri 17 Mar 2017 12:06:04 GMT
# gpg: using RSA key 0x

Merge remote-tracking branch 'remotes/kevin/tags/for-upstream' into staging

Block layer fixes for 2.9.0-rc1

# gpg: Signature made Fri 17 Mar 2017 12:06:04 GMT
# gpg: using RSA key 0x7F09B272C88F2FD6
# gpg: Good signature from "Kevin Wolf <kwolf@redhat.com>"
# Primary key fingerprint: DC3D EB15 9A9A F95D 3D74 56FE 7F09 B272 C88F 2FD6

* remotes/kevin/tags/for-upstream:
block: quiesce AioContext when detaching from it
thread-pool: add missing qemu_bh_cancel in completion function
block: Propagate error in bdrv_open_backing_file
blockdev: fix bitmap clear undo
block: Always call bdrv_child_check_perm first
file-posix: Don't leak fd in hdev_get_max_segments
replication: clarify permissions
file-posix: clean up max_segments buffer termination

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

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thread-pool: add missing qemu_bh_cancel in completion function

commit 3c80ca15 fixed a deadlock scenarion with nested aio_poll invocations.

However, the rescheduling of the completion BH introcuded

thread-pool: add missing qemu_bh_cancel in completion function

commit 3c80ca15 fixed a deadlock scenarion with nested aio_poll invocations.

However, the rescheduling of the completion BH introcuded unnecessary spinning
in the main-loop. On very fast file backends this can even lead to the
"WARNING: I/O thread spun for 1000 iterations" message popping up.

Callgrind reports about 3-4% less instructions with this patch running
qemu-img bench on a ramdisk based VMDK file.

Fixes: 3c80ca158c96ff902a30883a8933e755988948b1
Cc: qemu-stable@nongnu.org
Signed-off-by: Peter Lieven <pl@kamp.de>
Signed-off-by: Kevin Wolf <kwolf@redhat.com>

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

Pull request

v2:
* Rebased to resolve scsi conflicts

# gpg: Signature made Tue 21 Feb 2017 11:56:24 GMT
# gpg:

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

Pull request

v2:
* Rebased to resolve scsi conflicts

# gpg: Signature made Tue 21 Feb 2017 11:56:24 GMT
# gpg: using RSA key 0x9CA4ABB381AB73C8
# gpg: Good signature from "Stefan Hajnoczi <stefanha@redhat.com>"
# gpg: aka "Stefan Hajnoczi <stefanha@gmail.com>"
# Primary key fingerprint: 8695 A8BF D3F9 7CDA AC35 775A 9CA4 ABB3 81AB 73C8

* remotes/stefanha/tags/block-pull-request: (24 commits)
coroutine-lock: make CoRwlock thread-safe and fair
coroutine-lock: add mutex argument to CoQueue APIs
coroutine-lock: place CoMutex before CoQueue in header
test-aio-multithread: add performance comparison with thread-based mutexes
coroutine-lock: add limited spinning to CoMutex
coroutine-lock: make CoMutex thread-safe
block: document fields protected by AioContext lock
async: remove unnecessary inc/dec pairs
aio-posix: partially inline aio_dispatch into aio_poll
block: explicitly acquire aiocontext in aio callbacks that need it
block: explicitly acquire aiocontext in bottom halves that need it
block: explicitly acquire aiocontext in callbacks that need it
block: explicitly acquire aiocontext in timers that need it
aio: push aio_context_acquire/release down to dispatching
qed: introduce qed_aio_start_io and qed_aio_next_io_cb
blkdebug: reschedule coroutine on the AioContext it is running on
coroutine-lock: reschedule coroutine on the AioContext it was running on
nbd: convert to use qio_channel_yield
io: make qio_channel_yield aware of AioContexts
io: add methods to set I/O handlers on AioContext
...

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

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block: explicitly acquire aiocontext in aio callbacks that need it

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

block: explicitly acquire aiocontext in aio callbacks that need it

Reviewed-by: Stefan Hajnoczi <stefanha@redhat.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
Reviewed-by: Fam Zheng <famz@redhat.com>
Reviewed-by: Daniel P. Berrange <berrange@redhat.com>
Message-id: 20170213135235.12274-16-pbonzini@redhat.com
Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com>

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block: explicitly acquire aiocontext in bottom halves that need it

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

block: explicitly acquire aiocontext in bottom halves that need it

Reviewed-by: Stefan Hajnoczi <stefanha@redhat.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
Reviewed-by: Fam Zheng <famz@redhat.com>
Reviewed-by: Daniel P. Berrange <berrange@redhat.com>
Message-id: 20170213135235.12274-15-pbonzini@redhat.com
Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com>

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block: move AioContext, QEMUTimer, main-loop to libqemuutil

AioContext is fairly self contained, the only dependency is QEMUTimer but
that in turn doesn't need anything else. So move them out of bl

block: move AioContext, QEMUTimer, main-loop to libqemuutil

AioContext is fairly self contained, the only dependency is QEMUTimer but
that in turn doesn't need anything else. So move them out of block-obj-y
to avoid introducing a dependency from io/ to block-obj-y.

main-loop and its dependency iohandler also need to be moved, because
later in this series io/ will call iohandler_get_aio_context.

[Changed copyright "the QEMU team" to "other QEMU contributors" as
suggested by Daniel Berrange and agreed by Paolo.
--Stefan]

Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
Reviewed-by: Fam Zheng <famz@redhat.com>
Message-id: 20170213135235.12274-2-pbonzini@redhat.com
Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com>

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