disas does not need to access the CPU env for any reason. Change the
APIs to accept CPU pointers instead. Small change pattern needs to be
applied to all target translate.c. This brings us closer to making
disas.o a common-obj and less architecture specific in general.
Cc: Richard Henderson <rth@twiddle.net>
Cc: Peter Maydell <peter.maydell@linaro.org>
Cc: "Edgar E. Iglesias" <edgar.iglesias@gmail.com>
Cc: Paolo Bonzini <pbonzini@redhat.com>
Cc: Eduardo Habkost <ehabkost@redhat.com>
Cc: Michael Walle <michael@walle.cc>
Cc: Aurelien Jarno <aurelien@aurel32.net>
Cc: Leon Alrae <leon.alrae@imgtec.com>
Cc: Jia Liu <proljc@gmail.com>
Cc: Alexander Graf <agraf@suse.de>
Cc: Mark Cave-Ayland <mark.cave-ayland@ilande.co.uk>
Cc: Bastian Koppelmann <kbastian@mail.uni-paderborn.de>
Cc: Guan Xuetao <gxt@mprc.pku.edu.cn>
Cc: Max Filippov <jcmvbkbc@gmail.com>
Reviewed-by: Richard Henderson <rth@twiddle.net>
Reviewed-by: Eduardo Habkost <ehabkost@redhat.com>
Signed-off-by: Peter Crosthwaite <crosthwaite.peter@gmail.com>
Acked-by: Luiz Capitulino <lcapitulino@redhat.com>
Signed-off-by: Markus Armbruster <armbru@redhat.com>
* Changes to name string ownership for alias properties
* Improvements around enum properties
* Cleanups around -object handling
* New helper functions
* Cleanups of qdev init helper functions
* Add path argument to qom-tree script
* QTest cleanup to use new qtest_add_data_func() consistently
-----BEGIN PGP SIGNATURE-----
Version: GnuPG v2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=bIg2
-----END PGP SIGNATURE-----
Merge remote-tracking branch 'remotes/afaerber/tags/qom-devices-for-peter' into staging
QOM infrastructure fixes and device conversions
* Changes to name string ownership for alias properties
* Improvements around enum properties
* Cleanups around -object handling
* New helper functions
* Cleanups of qdev init helper functions
* Add path argument to qom-tree script
* QTest cleanup to use new qtest_add_data_func() consistently
# gpg: Signature made Fri Jun 19 18:14:38 2015 BST using RSA key ID 3E7E013F
# gpg: Good signature from "Andreas Färber <afaerber@suse.de>"
# gpg: aka "Andreas Färber <afaerber@suse.com>"
* remotes/afaerber/tags/qom-devices-for-peter:
qdev: Un-deprecate qdev_init_nofail()
qdev: Deprecated qdev_init() is finally unused, drop
qom: Don't pass string table to object_get_enum() function
qom: Add an object_property_add_enum() helper function
qom: Make enum string tables const-correct
qom: Add object_new_with_props() / object_new_withpropv() helpers
qom: Add helper function for getting user objects root
vl: Create (most) objects before creating chardev backends
doc: Document user creatable object types in help text
backends: Fix typename of 'policy' enum property in hostmem obj
scripts: Add support for path as argument of qom-tree
tests: Use qtest_add_data_func() consistently
qdev: Free property names after registering gpio aliases
qom: strdup() target property name on object_property_add_alias()
Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
It is reasonably common to want to create an object, set a
number of properties, register it in the hierarchy and then
mark it as complete (if a user creatable type). This requires
quite a lot of error prone, verbose, boilerplate code to achieve.
First a pair of functions object_set_props() / object_set_propv()
are added which allow for a list of objects to be set in
one single API call.
Then object_new_with_props() / object_new_with_propv() constructors
are added which simplify the sequence of calls to create an
object, populate properties, register in the object composition
tree and mark the object complete, into a single method call.
Usage would be:
Error *err = NULL;
Object *obj;
obj = object_new_with_propv(TYPE_MEMORY_BACKEND_FILE,
object_get_objects_root(),
"hostmem0",
&err,
"share", "yes",
"mem-path", "/dev/shm/somefile",
"prealloc", "yes",
"size", "1048576",
NULL);
Note all property values are passed in string form and will
be parsed into their required data types, using normal QOM
semantics for parsing from string format.
Signed-off-by: Daniel P. Berrange <berrange@redhat.com>
Reviewed-by: Eric Blake <eblake@redhat.com>
Signed-off-by: Andreas Färber <afaerber@suse.de>
Commit 691a0c9c introduced a mechanism by which QEMU_CLOCK_HOST can
notify other parts of the emulator when the host clock has jumped
backward. This is used to avoid stalling timers that were scheduled
based on the host clock.
However, if the host clock jumps forward, then timers that were
scheduled based on the host clock may fire rapidly and cause other
problems. For example, the mc146818rtc periodic timer will block
execution of the VM and consume host CPU while firing every interrupt
for the time period that was skipped by the host clock.
To correct that problem, this commit fires the reset notification if the
host clock jumps forward by more than a hard-coded limit. The limit is
currently set to a value of 60 seconds, which should be small enough to
prevent excessive timer loops, but large enough to avoid frequent resets
in idle VMs.
Signed-off-by: Paul Donohue <qemu-git@PaulSD.com>
Message-Id: <20150612140845.GD2749@TopQuark.net>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
-----BEGIN PGP SIGNATURE-----
Version: GnuPG v2.0.22 (GNU/Linux)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=QgYk
-----END PGP SIGNATURE-----
Merge remote-tracking branch 'remotes/kevin/tags/for-upstream' into staging
Block layer core and image format patches
# gpg: Signature made Fri Jun 12 16:08:53 2015 BST using RSA key ID C88F2FD6
# gpg: Good signature from "Kevin Wolf <kwolf@redhat.com>"
* remotes/kevin/tags/for-upstream: (25 commits)
block: Fix reopen flag inheritance
block: Add BlockDriverState.inherits_from
block: Add list of children to BlockDriverState
queue.h: Add QLIST_FIX_HEAD_PTR()
block: Drain requests before swapping nodes in bdrv_swap()
block: Move flag inheritance to bdrv_open_inherit()
block: Use QemuOpts in bdrv_open_common()
block: Use macro for cache option names
vmdk: Use bdrv_open_image()
quorum: Use bdrv_open_image()
check-qdict: Test cases for new functions
qdict: Add qdict_{set,copy}_default()
qdict: Add qdict_array_entries()
iotests: Add tests for overriding BDRV_O_PROTOCOL
block: driver should override flags in bdrv_open()
block: Change bitmap truncate conditional to assertion
block: record new size in bdrv_dirty_bitmap_truncate
raw-posix: Fix .bdrv_co_get_block_status() for unaligned image size
vmdk: Use vmdk_find_index_in_cluster everywhere
vmdk: Fix index_in_cluster calculation in vmdk_co_get_block_status
...
Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
Version: GnuPG v1
iQEcBAABAgAGBQJVevNrAAoJEJykq7OBq3PIn3wH/iTkoxK+8c6vHY4gAyW/3Vel
JAWyDULliLg/mJiyDyz+9hbyb3FmDsQ7Gve5laFCqSES8IChe/fAoR2dXAapHbJm
VroBii+C4MIakAjB1eSGVTMeJVgyq0SxCbEgo6MSgCNRg8pH/ne4kGMn0elsyMQm
VrxqsoW1qda0gLbybu7uRKmdZlb5Eklk0zQmBlzd25j3xgMXmo7ZcXW0d7dCi/xd
ot01aPNHWKy2FyYsI+N1SMagCedjn0FFCHMMc08W34olUOAschV+Croxi6gupbTl
RdlYNnB6BBYLgT7mxYuKKd20r4Q8Si3E5YjIsYaXIskbCOxDuryKboyheMXWqdA=
=mx5x
-----END PGP SIGNATURE-----
Merge remote-tracking branch 'remotes/stefanha/tags/block-pull-request' into staging
# gpg: Signature made Fri Jun 12 15:57:47 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:
qemu-iotests: expand test 093 to support group throttling
throttle: Update throttle infrastructure copyright
throttle: add the name of the ThrottleGroup to BlockDeviceInfo
throttle: acquire the ThrottleGroup lock in bdrv_swap()
throttle: Add throttle group support
throttle: Add throttle group infrastructure tests
throttle: Add throttle group infrastructure
throttle: Extract timers from ThrottleState into a separate structure
raw-posix: Fix .bdrv_co_get_block_status() for unaligned image size
Revert "iothread: release iothread around aio_poll"
Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
If the head of a list has been moved to a different memory location, the
le_prev link in the first list entry has to be fixed up. Provide a macro
that implements this fixup.
Signed-off-by: Kevin Wolf <kwolf@redhat.com>
Reviewed-by: Eric Blake <eblake@redhat.com>
Reviewed-by: Max Reitz <mreitz@redhat.com>
Version: GnuPG v1
iQEcBAABAgAGBQJVetcwAAoJEJykq7OBq3PI+84IAMfkE0uCXdUbp3jZP9iVx68y
ZtHbhpnZle3bmVFBkgsF8vHWsMlxMZzr2PpAl02VXrrE6z0ScTz+GmVU2V89Y5nv
kn9DhAR4gcyKbKKgRtwjCLMoCfxsdaHTOJXfcHhsiqQP4PwdFkV6bQAymwcJegY/
ze5wKX8XqIML6yUCnhrN41pjt6NkIQoyRneLwX5ymeRLfWg23i9YOVU4Njmm9X52
kH7Xg0UuT6HTyyNER7iqwh61gQ33ETkfWd9UrHFGi7q70UJAr+cVXtzJjqnh08OU
BExph/lQfxXuivpiThvjZkPvMVqISyCrsIAXrwjhXnjqwz/3nt3i6zrfvPNNPG0=
=VdKf
-----END PGP SIGNATURE-----
Merge remote-tracking branch 'remotes/stefanha/tags/net-pull-request' into staging
# gpg: Signature made Fri Jun 12 13:57:20 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/net-pull-request:
qmp/hmp: add rocker device support
rocker: bring link up/down on PHY enable/disable
rocker: update tests using hw-derived interface names
rocker: Add support for phys name
iohandler: Change return type of qemu_set_fd_handler to "void"
event-notifier: Always return 0 for posix implementation
xen_backend: Remove unused error handling of qemu_set_fd_handler
oss: Remove unused error handling of qemu_set_fd_handler
alsaaudio: Remove unused error handling of qemu_set_fd_handler
main-loop: Drop qemu_set_fd_handler2
Change qemu_set_fd_handler2(..., NULL, ...) to qemu_set_fd_handler
tap: Drop tap_can_send
net/socket: Drop net_socket_can_send
netmap: Drop netmap_can_send
l2tpv3: Drop l2tpv3_can_send
stubs: Add qemu_set_fd_handler
Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
Group throttling will share ThrottleState between multiple bs.
As a consequence the ThrottleState will be accessed by multiple aio
context.
Timers are tied to their aio context so they must go out of the
ThrottleState structure.
This commit paves the way for each bs of a common ThrottleState to
have its own timer.
Signed-off-by: Benoit Canet <benoit.canet@nodalink.com>
Signed-off-by: Alberto Garcia <berto@igalia.com>
Reviewed-by: Stefan Hajnoczi <stefanha@redhat.com>
Message-id: 6cf9ea96d8b32ae2f8769cead38f68a6a0c8c909.1433779731.git.berto@igalia.com
Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com>
All users are converted to qemu_set_fd_handler now, drop
qemu_set_fd_handler2 and IOHandlerRecord.fd_read_poll.
Signed-off-by: Fam Zheng <famz@redhat.com>
Message-id: 1433400324-7358-9-git-send-email-famz@redhat.com
Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com>
In postcopy we need the loadvm_handlers to be used in a couple
of different instances of the loadvm loop/routine, and thus
it can't be local any more.
Signed-off-by: Dr. David Alan Gilbert <dgilbert@redhat.com>
Reviewed-by: David Gibson <david@gibson.dropbear.id.au>
Reviewed-by: Juan Quintela <quintela@redhat.com>
Signed-off-by: Juan Quintela <quintela@redhat.com>
There are currently lots of pieces of incoming migration state scattered
around, and postcopy is adding more, and it seems better to try and keep
it together.
allocate MIS in process_incoming_migration_co
Signed-off-by: Dr. David Alan Gilbert <dgilbert@redhat.com>
Reviewed-by: Amit Shah <amit.shah@redhat.com>
Reviewed-by: David Gibson <david@gibson.dropbear.id.au>
Reviewed-by: Juan Quintela <quintela@redhat.com>
Signed-off-by: Juan Quintela <quintela@redhat.com>
Retain the function value for now, to permit selective conversion of
its callers.
Signed-off-by: Markus Armbruster <armbru@redhat.com>
Reviewed-by: Eric Blake <eblake@redhat.com>
When the argument is non-zero, qemu_opt_foreach() stops on callback
returning non-zero, and returns that value.
When the argument is zero, it doesn't stop, and returns the callback's
value from the last iteration.
The two callers that pass zero could just as well pass one:
* qemu_spice_init()'s callback add_channel() either returns zero or
exit()s.
* config_write_opts()'s callback config_write_opt() always returns
zero.
Drop the parameter, and always stop.
Signed-off-by: Markus Armbruster <armbru@redhat.com>
Reviewed-by: Eric Blake <eblake@redhat.com>
Retain the function value for now, to permit selective conversion of
its callers.
Signed-off-by: Markus Armbruster <armbru@redhat.com>
Reviewed-by: Eric Blake <eblake@redhat.com>
Acked-by: Kevin Wolf <kwolf@redhat.com>
When the argument is non-zero, qemu_opts_foreach() stops on callback
returning non-zero, and returns that value.
When the argument is zero, it doesn't stop, and returns the bit-wise
inclusive or of all the return values. Funky :)
The callers that pass zero could just as well pass one, because their
callbacks can't return anything but zero:
* qemu_add_globals()'s callback qdev_add_one_global()
* qemu_config_write()'s callback config_write_opts()
* main()'s callbacks default_driver_check(), drive_enable_snapshot(),
vnc_init_func()
Drop the parameter, and always stop.
Signed-off-by: Markus Armbruster <armbru@redhat.com>
Reviewed-by: Eric Blake <eblake@redhat.com>
Acked-by: Kevin Wolf <kwolf@redhat.com>
__atomic_thread_fence does not include a compiler barrier; in the
C++11 memory model, fences take effect in combination with other
atomic operations. GCC implements this by making __atomic_load and
__atomic_store access memory as if the pointer was volatile, and
leaves no trace whatsoever of acquire and release fences in the
compiler's intermediate representation.
In QEMU, we want memory barriers to act on all memory, but at the same
time we would like to use __atomic_thread_fence for portability reasons.
Add compiler barriers manually around the __atomic_thread_fence.
Message-Id: <1433334080-14912-1-git-send-email-pbonzini@redhat.com>
Reviewed-by: Stefan Hajnoczi <stefanha@redhat.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
The new bitmap_test_and_clear_atomic() function clears a range and
returns whether or not the bits were set.
Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com>
Message-Id: <1417519399-3166-3-git-send-email-stefanha@redhat.com>
[Test before xchg; then a full barrier is needed at the end just like
in the previous patch. The barrier can be avoided if we did at least
one xchg. - Paolo]
Reviewed-by: Fam Zheng <famz@redhat.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
Use atomic_or() for atomic bitmaps where several threads may set bits at
the same time. This avoids the race condition between threads loading
an element, bitwise ORing, and then storing the element.
When setting all bits in a word we can avoid atomic ops and instead just
use an smp_mb() at the end.
Most bitmap users don't need atomicity so introduce new functions.
Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com>
Message-Id: <1417519399-3166-2-git-send-email-stefanha@redhat.com>
[Avoid barrier in the single word case, use full barrier instead of write.
- Paolo]
Reviewed-by: Fam Zheng <famz@redhat.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
The qemu-img.c file has a read_password() method impl that is
used to prompt for passwords on the console, with impls for
POSIX and Windows. This will be needed by qemu-io.c too, so
move it into the QEMU osdep/oslib files where it can be shared
without code duplication
Signed-off-by: Daniel P. Berrange <berrange@redhat.com>
Reviewed-by: Eric Blake <eblake@redhat.com>
Signed-off-by: Kevin Wolf <kwolf@redhat.com>
Delete the unused functions qemu_signalfd_available(),
qemu_send_full() and qemu_recv_full().
Signed-off-by: Thomas Huth <thuth@linux.vnet.ibm.com>
Signed-off-by: Michael Tokarev <mjt@tls.msk.ru>
Signed-off-by: John Snow <jsnow@redhat.com>
Reviewed-by: Max Reitz <mreitz@redhat.com>
Reviewed-by: Stefan Hajnoczi <stefanha@redhat.com>
Message-id: 1429314609-29776-16-git-send-email-jsnow@redhat.com
Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com>
Signed-off-by: Kevin Wolf <kwolf@redhat.com>
We add a bitmap merge operation to assist in error cases
where we wish to combine two bitmaps together.
This is algorithmically O(bits) provided HBITMAP_LEVELS remains
constant. For a full bitmap on a 64bit machine:
sum(bits/64^k, k, 0, HBITMAP_LEVELS) ~= 1.01587 * bits
We may be able to improve running speed for particularly sparse
bitmaps by using iterators, but the running time for dense maps
will be worse.
We present the simpler solution first, and we can refine it later
if needed.
Signed-off-by: John Snow <jsnow@redhat.com>
Reviewed-by: Max Reitz <mreitz@redhat.com>
Reviewed-by: Eric Blake <eblake@redhat.com>
Reviewed-by: Stefan Hajnoczi <stefanha@redhat.com>
Message-id: 1429314609-29776-8-git-send-email-jsnow@redhat.com
Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com>
Signed-off-by: Kevin Wolf <kwolf@redhat.com>
If QEMU forks after the CPU threads have been created, qemu_mutex_lock_iothread
will not be able to do qemu_cpu_kick_thread. There is no solution other than
assuming that forks after the CPU threads have been created will end up in an
exec. Forks before the CPU threads have been created (such as -daemonize)
have to call rcu_after_fork manually.
Notably, the oxygen theme for GTK+ forks and shows a "No such process" error
without this patch.
This patch can be reverted once the iothread loses the "kick the TCG thread"
magic.
User-mode emulation does not use the iothread, so it can also call
rcu_after_fork.
Reported by: Dr. David Alan Gilbert <dgilbert@redhat.com>
Tested by: Dr. David Alan Gilbert <dgilbert@redhat.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
2ed1ebcf6 "timer: replace time() with QEMU_CLOCK_HOST" broke compile
when configured with --enable-profiler. Turned out the profiler has been
broken for a while.
This does s/qemu_time/tcg_time/ as the profiler only works in a TCG mode.
This also fixes the compile error.
This changes profile_getclock() to return nanoseconds rather than
CPU ticks as the "profile" HMP command prints seconds and there is no
platform-independent way to get ticks-per-second rate.
Since TCG is quite slow and get_clock() returns nanoseconds (fine
enough), this should not affect precision much.
This removes unused qemu_time_start and tlb_flush_time.
Signed-off-by: Alexey Kardashevskiy <aik@ozlabs.ru>
Message-Id: <1426478258-29961-1-git-send-email-aik@ozlabs.ru>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
There is a not-so-subtle race in QSLIST_INSERT_HEAD_ATOMIC.
Because atomic_cmpxchg returns the old value instead of a success flag,
QSLIST_INSERT_HEAD_ATOMIC was checking for success by comparing against
the second argument to atomic_cmpxchg. Unfortunately, this only works
if the second argument is a local or thread-local variable.
If it is in memory, it can be subject to common subexpression elimination
(and then everything's fine) or reloaded after the atomic_cmpxchg,
depending on the compiler's whims. If the latter happens, the race can
happen. A thread can sneak in, doing something on elm->field.sle_next
after the atomic_cmpxchg and before the comparison. This causes a wrong
failure, and then two threads are using "elm" at the same time. In the
case discovered by Christian, the sequence was likely something like this:
thread 1 | thread 2
QSLIST_INSERT_HEAD_ATOMIC |
atomic_cmpxchg succeeds |
elm added to list |
| steal release_pool
| QSLIST_REMOVE_HEAD
| elm removed from list
| ...
| QSLIST_INSERT_HEAD_ATOMIC
| (overwrites sle_next)
spurious failure |
atomic_cmpxchg succeeds |
elm added to list again |
|
steal release_pool |
QSLIST_REMOVE_HEAD |
elm removed again |
The last three steps could be done by a third thread as well.
A reproducer that failed in a matter of seconds is as follows:
- the guest has 32 VCPUs on a 28 core host (hyperthreading was enabled),
memory was 16G just to err on the safe side (the host has 64G, but hey
at least you need no s390)
- the guest has 24 null-aio virtio-blk devices using dataplane
(-object iothread,id=ioN -drive if=none,id=blkN,driver=null-aio,size=500G
-device virtio-blk-pci,iothread=ioN,drive=blkN)
- the guest also has a single network interface. It's only doing loopback
tests so slirp vs. tap and the model doesn't matter.
- the guest is running fio with the following script:
[global]
rw=randread
blocksize=16k
ioengine=libaio
runtime=10m
buffered=0
fallocate=none
time_based
iodepth=32
[virtio1a]
filename=/dev/block/252\:16
[virtio1b]
filename=/dev/block/252\:16
...
[virtio24a]
filename=/dev/block/252\:384
[virtio24b]
filename=/dev/block/252\:384
[listen1]
protocol=tcp
ioengine=net
port=12345
listen
rw=read
bs=4k
size=1000g
[connect1]
protocol=tcp
hostname=localhost
ioengine=net
port=12345
protocol=tcp
rw=write
startdelay=1
size=1000g
...
[listen8]
protocol=tcp
ioengine=net
port=12352
listen
rw=read
bs=4k
size=1000g
[connect8]
protocol=tcp
hostname=localhost
ioengine=net
port=12352
rw=write
startdelay=1
size=1000g
Moral of the story: I should refrain from writing more clever stuff.
At least it looks like it is not too clever to be undebuggable.
Reported-by: Christian Borntraeger <borntraeger@de.ibm.com>
Tested-by: Christian Borntraeger <borntraeger@de.ibm.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
Message-id: 1426002357-6889-1-git-send-email-pbonzini@redhat.com
Fixes: c740ad92d0
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com>
The documentation for sextract64() claims that the return type is
an int64_t, but the code itself disagrees. Fix the return type to
conform to the documentation and to bring it into line with
sextract32(), which returns int32_t.
Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
Reviewed-by: Richard Henderson <rth@twiddle.net>
Message-id: 1423231328-15662-1-git-send-email-peter.maydell@linaro.org
img_convert() and img_amend() use qemu_opts_do_parse(), which reports
errors with qerror_report_err(). Its error messages aren't helpful
here, the caller reports one that actually makes sense. Reproducer:
$ qemu-img convert -o backing_format=raw in.img out.img
qemu-img: Invalid parameter 'backing_format'
qemu-img: Invalid options for file format 'raw'
To fix, propagate errors through qemu_opts_do_parse(). This lifts the
error reporting into callers. Drop it from img_convert() and
img_amend(), keep it in qemu_chr_parse_compat(), bdrv_img_create().
Since I'm touching qemu_opts_do_parse() anyway, write a function
comment for it.
Signed-off-by: Markus Armbruster <armbru@redhat.com>
Reviewed-by: Eric Blake <eblake@redhat.com>
qemu_opt_set() is a wrapper around qemu_opt_set() that reports the
error with qerror_report_err().
Most of its users assume the function can't fail. Make them use
qemu_opt_set_err() with &error_abort, so that should the assumption
ever break, it'll break noisily.
Just two users remain, in util/qemu-config.c. Switch them to
qemu_opt_set_err() as well, then rename qemu_opt_set_err() to
qemu_opt_set().
Signed-off-by: Markus Armbruster <armbru@redhat.com>
Reviewed-by: Eric Blake <eblake@redhat.com>
Return the Error object instead of reporting it with
qerror_report_err().
Change callers that assume the function can't fail to pass
&error_abort, so that should the assumption ever break, it'll break
noisily.
Turns out all callers outside its unit test assume that. We could
drop the Error ** argument, but that would make the interface less
regular, so don't.
Signed-off-by: Markus Armbruster <armbru@redhat.com>
Reviewed-by: Eric Blake <eblake@redhat.com>
Return the Error object instead of reporting it with
qerror_report_err().
Change callers that assume the function can't fail to pass
&error_abort, so that should the assumption ever break, it'll break
noisily.
Turns out all callers outside its unit test assume that. We could
drop the Error ** argument, but that would make the interface less
regular, so don't.
Signed-off-by: Markus Armbruster <armbru@redhat.com>
Reviewed-by: Eric Blake <eblake@redhat.com>
Return the Error object instead of reporting it with
qerror_report_err().
Change callers that assume the function can't fail to pass
&error_abort, so that should the assumption ever break, it'll break
noisily.
Turns out all callers outside its unit test assume that. We could
drop the Error ** argument, but that would make the interface less
regular, so don't.
Signed-off-by: Markus Armbruster <armbru@redhat.com>
Reviewed-by: Eric Blake <eblake@redhat.com>
Add RCU-enabled variants on the existing bsd DQ facility. Each
operation has the same interface as the existing (non-RCU)
version. Also, each operation is implemented as macro.
Using the RCU-enabled QLIST, existing QLIST users will be able to
convert to RCU without using a different list interface.
Signed-off-by: Mike Day <ncmike@ncultra.org>
Reviewed-by: Fam Zheng <famz@redhat.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
With the introduction of QEMU_CLOCK_VIRTUAL_RT, the computation of
sc->diff_clk can be simplified nicely:
qemu_clock_get_ns(QEMU_CLOCK_VIRTUAL) -
qemu_clock_get_ns(QEMU_CLOCK_REALTIME) +
cpu_get_clock_offset()
= qemu_clock_get_ns(QEMU_CLOCK_VIRTUAL) -
(qemu_clock_get_ns(QEMU_CLOCK_REALTIME) - cpu_get_clock_offset())
= qemu_clock_get_ns(QEMU_CLOCK_VIRTUAL) -
(qemu_clock_get_ns(QEMU_CLOCK_REALTIME) + timers_state.cpu_clock_offset)
= qemu_clock_get_ns(QEMU_CLOCK_VIRTUAL) -
qemu_clock_get_ns(QEMU_CLOCK_VIRTUAL_RT)
Cc: Sebastian Tanase <sebastian.tanase@openwide.fr>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
Asynchronous callbacks provided by call_rcu are particularly important
for QEMU, because the BQL makes it hard to use synchronize_rcu.
In addition, the current RCU implementation is not particularly friendly
to multiple concurrent synchronize_rcu callers, making call_rcu even
more important.
Reviewed-by: Fam Zheng <famz@redhat.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
This includes a (mangled) copy of the liburcu code. The main changes
are: 1) removing dependencies on many other header files in liburcu; 2)
removing for simplicity the tentative busy waiting in synchronize_rcu,
which has limited performance effects; 3) replacing futexes in
synchronize_rcu with QemuEvents for Win32 portability. The API is
the same as liburcu, so it should be possible in the future to require
liburcu on POSIX systems for example and use our copy only on Windows.
Among the various versions available I chose urcu-mb, which is the
least invasive implementation even though it does not have the
fastest rcu_read_{lock,unlock} implementation. The urcu flavor can
be changed later, after benchmarking.
Reviewed-by: Fam Zheng <famz@redhat.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
In some cases, a timer was set to NULL so that we could check if it is
initialized. Use the timer_list field instead, and add a timer_deinit
function that NULLs it.
It then makes sense that timer_del be a no-op (instead of a crasher) on
such a de-initialized timer. It avoids the need to poke at the timerlist
field to check if the timers are initialized.
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
Add documentation of what the cpu_*_* accessors look like.
Correct some minor errors in the existing documentation of the
direct _p accessor family. Remove the near-duplicate comment
on the _p accessors from cpu-all.h and replace it with a reference
to the comment in bswap.h.
Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
Reviewed-by: Richard Henderson <rth@twiddle.net>
Reviewed-by: Paolo Bonzini <pbonzini@redhat.com>
Reviewed-by: Alex Bennée <alex.bennee@linaro.org>
Message-id: 1421334118-3287-16-git-send-email-peter.maydell@linaro.org
The Xen ioreq-server API, introduced in Xen 4.5, requires that PCI device
models explicitly register with Xen for config space accesses. This patch
adds a listener interface into qdev-core which can be used by the Xen
interface code to monitor for arrival and departure of PCI devices.
Signed-off-by: Paul Durrant <paul.durrant@citrix.com>
Signed-off-by: Stefano Stabellini <stefano.stabellini@eu.citrix.com>
Reviewed-by: Paolo Bonzini <pbonzini@redhat.com>
Add QEMUFile interface to allow a socket to be 'shut down' - i.e. any
reads/writes will fail (and any blocking read/write will be woken).
Signed-off-by: Dr. David Alan Gilbert <dgilbert@redhat.com>
Reviewed-by: Paolo Bonzini <pbonzini@redhat.com>
Reviewed-by: Amit Shah <amit.shah@redhat.com>
Signed-off-by: Amit Shah <amit.shah@redhat.com>
the record/replay series, and a few SCSI and i386 patches as well.
-----BEGIN PGP SIGNATURE-----
Version: GnuPG v2.0.22 (GNU/Linux)
iQEcBAABAgAGBQJUtjlCAAoJEL/70l94x66Dy5gH/0QIHoXVH/2wuA9apNK2/gBj
2U7g08QGKlc2wQGF4a48sQf523lSt5eirVxrwta0wmvFeznrdR84d4YGpolHM67A
Q9Y5J2i+v1H6cfQH6ylq61QQ7rEC3+isa65wblLeMSCAb2W1CcV7avSKu4BSPZw2
jGr3jd2Ve7pOsULpPhiNsmmltYSeZc7sQBYc9C7fQEoxOGsNnRoKOUKPnIk1mJTc
iYH480L1MnOL3enIz13K34lQofNRhJxJBLYKhYsBydQbOh0/Ls1eifOY4xEegXZ0
IUODy6c2pk+s/IUPARpBucKGKzDxdv0DLXDV60uGn5EsYT0CjCl9/sRs3bZvaQE=
=eT8u
-----END PGP SIGNATURE-----
Merge remote-tracking branch 'remotes/bonzini/tags/for-upstream' into staging
Mostly bugfixes and cleanups from qemu-devel. Yet another small patch from
the record/replay series, and a few SCSI and i386 patches as well.
# gpg: Signature made Wed 14 Jan 2015 09:39:14 GMT using RSA key ID 78C7AE83
# gpg: Good signature from "Paolo Bonzini <bonzini@gnu.org>"
# gpg: aka "Paolo Bonzini <pbonzini@redhat.com>"
# gpg: WARNING: This key is not certified with sufficiently trusted signatures!
# gpg: It is not certain 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
* remotes/bonzini/tags/for-upstream:
cpus: consistently use QEMU_CLOCK_VIRTUAL_RT for icount_warp_rt timer
qemu-timer: rename timer_init to timer_init_tl
scsi: fix cancellation when I/O was completed but DMA was not.
rules.mak: Fix module build
hw/scsi/lsi53c895a: add support for additional diag / debug registers
qemu-common.h: optimise muldiv64 if int128 is available
target-i386: do not memcpy in and out of xmm_regs
target-i386: fix movntsd on big-endian hosts
vl.c: fix regression when reading memory size from config file
vl: Don't silently change topology when all -smp options were set
vl: fix max_cpus check
vl: Avoid unnecessary 'if' nesting
9pfs: changed to use event_notifier instead of qemu_pipe
vl.c: fix regression when reading machine type from config file
char: restore stdio echo on resume from suspend.
Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
These operations are trivial to implement and do not have ABA problems.
They are enough to implement simple multiple-producer, single consumer
lock-free lists or, as in the next patch, the multiple consumers can
steal a whole batch of elements and process them at their leisure.
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
Reviewed-by: Fam Zheng <famz@redhat.com>
Message-id: 1417518350-6167-5-git-send-email-pbonzini@redhat.com
Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com>
Destructors are the main additional feature of pthread TLS compared
to __thread. If we were using C++ (hint, hint!) we could have used
thread-local objects with a destructor. Since we are not, instead,
we add a simple Notifier-based API.
Note that the notifier must be per-thread as well. We can add a
global list as well later, perhaps.
The Win32 implementation has some complications because a) detached
threads used not to have a QemuThreadData; b) the main thread does
not go through win32_start_routine, so we have to use atexit too.
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
Reviewed-by: Fam Zheng <famz@redhat.com>
Message-id: 1417518350-6167-3-git-send-email-pbonzini@redhat.com
Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com>
