Power ISA 3.0 introduces a few quadruple precision floating point
instructions that support round-to-odd rounding mode. The
round-to-odd mode is explained as under:
Let Z be the intermediate arithmetic result or the operand of a convert
operation. If Z can be represented exactly in the target format, the
result is Z. Otherwise the result is either Z1 or Z2 whichever is odd.
Here Z1 and Z2 are the next larger and smaller numbers representable
in the target format respectively.
Signed-off-by: Bharata B Rao <bharata@linux.vnet.ibm.com>
Reviewed-by: Peter Maydell <peter.maydell@linaro.org>
Reviewed-by: Richard Henderson <rth@twiddle.net>
Signed-off-by: David Gibson <david@gibson.dropbear.id.au>
Programs run under qemu-ppc64 on an x86_64 host currently segfault
if they use pthread_create() due to the adjustment made to the NIP in
commit bd6fefe71c.
This patch changes cpu_loop() to set the NIP back to the
pre-incremented value before calling do_syscall(), which causes the
correct address to be used for the new thread and corrects the fault.
Signed-off-by: Sam Bobroff <sam.bobroff@au1.ibm.com>
Reviewed-by: Laurent Vivier <laurent@vivier.eu>
Reviewed-by: Peter Maydell <peter.maydell@linaro.org>
Signed-off-by: David Gibson <david@gibson.dropbear.id.au>
Use the available wait instruction implementation.
Signed-off-by: Nikunj A Dadhania <nikunj@linux.vnet.ibm.com>
Signed-off-by: David Gibson <david@gibson.dropbear.id.au>
slbsync: SLB Synchoronize
The instruction provides an ordering function for the effects of all
slbieg instructions executed by the thread executing the slbsync
instruction.
Signed-off-by: Nikunj A Dadhania <nikunj@linux.vnet.ibm.com>
Signed-off-by: David Gibson <david@gibson.dropbear.id.au>
slbieg: SLB Invalidate Entry Global
Signed-off-by: Nikunj A Dadhania <nikunj@linux.vnet.ibm.com>
Signed-off-by: David Gibson <david@gibson.dropbear.id.au>
stwat: Store Word Atomic
stdat: Store Doubleword Atomic
The instruction includes as function code (5 bits) which gives a detail
on the operation to be performed. The patch implements five such
functions.
Signed-off-by: Balamuruhan S <bala24@linux.vnet.ibm.com>
Signed-off-by: Harish S <harisrir@linux.vnet.ibm.com>
Signed-off-by: Athira Rajeev <atrajeev@linux.vnet.ibm.com>
[ implement stdat, use macro and combine both implementation ]
Signed-off-by: Nikunj A Dadhania <nikunj@linux.vnet.ibm.com>
Signed-off-by: David Gibson <david@gibson.dropbear.id.au>
lwat: Load Word Atomic
ldat: Load Doubleword Atomic
The instruction includes as function code (5 bits) which gives a detail
on the operation to be performed. The patch implements five such
functions.
Signed-off-by: Balamuruhan S <bala24@linux.vnet.ibm.com>
Signed-off-by: Harish S <harisrir@linux.vnet.ibm.com>
Signed-off-by: Athira Rajeev <atrajeev@linux.vnet.ibm.com>
[ combine both lwat/ldat implementation using macro ]
Signed-off-by: Nikunj A Dadhania <nikunj@linux.vnet.ibm.com>
Signed-off-by: David Gibson <david@gibson.dropbear.id.au>
The last byte of the option vector was missing due to an off-by-one
error. Without this fix, client architecture support negotiation will
fail because the last byte of option vector 5, which contains the MMU
support, will be missed.
Signed-off-by: Sam Bobroff <sam.bobroff@au1.ibm.com>
Reviewed-by: Thomas Huth <thuth@redhat.com>
Reviewed-by: Michael Roth <mdroth@linux.vnet.ibm.com>
Signed-off-by: David Gibson <david@gibson.dropbear.id.au>
error_report() already puts a prefix with the program name in front
of the error strings, so the "qemu:" prefix is not necessary here
anymore.
Reported-by: Markus Armbruster <armbru@redhat.com>
Signed-off-by: Thomas Huth <thuth@redhat.com>
Signed-off-by: David Gibson <david@gibson.dropbear.id.au>
spapr_core_unplug() were essentially spapr_core_unplug_request()
handler that requested CPU removal and registered callback
which did actual cpu core removali but it was called from
spapr_machine_device_unplug() which is intended for actual object
removal. Commit (cf632463 spapr: Memory hot-unplug support)
sort of fixed it introducing spapr_machine_device_unplug_request()
and calling spapr_core_unplug() but it hasn't renamed callback and
by mistake calls it from spapr_machine_device_unplug().
However spapr_machine_device_unplug() isn't ever called for
cpu core since spapr_core_release() doesn't follow expected
hotunplug call flow which is:
1: device_del() ->
hotplug_handler_unplug_request() ->
set destroy_cb()
2: destroy_cb() ->
hotplug_handler_unplug() ->
object_unparent // actual device removal
Fix it by renaming spapr_core_unplug() to spapr_core_unplug_request()
which is called from spapr_machine_device_unplug_request() and
making spapr_core_release() call hotplug_handler_unplug() which
will call spapr_machine_device_unplug() -> spapr_core_unplug()
to remove cpu core.
Signed-off-by: Igor Mammedov <imammedo@redhat.com>
Reveiwed-by: Bharata B Rao <bharata@linux.vnet.ibm.com>
Signed-off-by: David Gibson <david@gibson.dropbear.id.au>
spapr_core_pre_plug/spapr_core_plug/spapr_core_unplug() are managing
wiring CPU core into spapr machine state and not internal CPU core state.
So move them from spapr_cpu_core.c to spapr.c where other similar
(spapr_memory_[foo]plug()) callbacks are located, which also matches
x86 target practice.
Signed-off-by: Igor Mammedov <imammedo@redhat.com>
Signed-off-by: David Gibson <david@gibson.dropbear.id.au>
Split off destroying VCPU threads from drc callback
spapr_core_release() into new spapr_cpu_core_unrealizefn()
which takes care of internal cpu core state cleanup (i.e.
VCPU threads) and is called when object_unparent(core)
is called.
That leaves spapr_core_release() only with board mgmt
code, which will be moved to board related file in
follow up patch along with the rest on hotplug callbacks.
Signed-off-by: Igor Mammedov <imammedo@redhat.com>
Reviewed-by: Bharata B Rao <bharata@linux.vnet.ibm.com>
Signed-off-by: David Gibson <david@gibson.dropbear.id.au>
The sheepdog URL is broken twice: First it uses a duplicated
http:// prefix, second the website seems to have moved to
https://sheepdog.github.io/sheepdog/ instead.
Signed-off-by: Thomas Huth <thuth@redhat.com>
Signed-off-by: Jeff Cody <jcody@redhat.com>
If explicit zeroing out before mirroring is required for the target image,
it moves the block job offset counter to EOF, then offset and len counters
count the image size twice. There is no harm but stats are confusing,
specifically the progress of the operation is always reported as 99% by
management tools.
The patch skips offset increase for the first "technical" pass over the
image. This should not cause any further harm.
Signed-off-by: Anton Nefedov <anton.nefedov@virtuozzo.com>
Signed-off-by: Denis V. Lunev <den@openvz.org>
Reviewed-by: Eric Blake <eblake@redhat.com>
Reviewed-by: Stefan Hajnoczi <stefanha@redhat.com>
Message-id: 1486045515-8009-1-git-send-email-den@openvz.org
CC: Jeff Cody <jcody@redhat.com>
CC: Kevin Wolf <kwolf@redhat.com>
CC: Max Reitz <mreitz@redhat.com>
CC: Eric Blake <eblake@redhat.com>
Signed-off-by: Jeff Cody <jcody@redhat.com>
This adds blockdev-add support for iscsi devices.
Reviewed-by: Daniel P. Berrange <berrange@redhat.com>
Reviewed-by: Fam Zheng <famz@redhat.com>
Signed-off-by: Kevin Wolf <kwolf@redhat.com>
Signed-off-by: Jeff Cody <jcody@redhat.com>
This was previously only available with -iscsi. Again, after this patch,
the -iscsi option only takes effect if an URL is given. New users are
supposed to use the new driver-specific option.
All -iscsi options have a corresponding driver-specific option for the
iscsi block driver now.
Reviewed-by: Daniel P. Berrange <berrange@redhat.com>
Reviewed-by: Fam Zheng <famz@redhat.com>
Signed-off-by: Kevin Wolf <kwolf@redhat.com>
Signed-off-by: Jeff Cody <jcody@redhat.com>
This was previously only available with -iscsi. Again, after this patch,
the -iscsi option only takes effect if an URL is given. New users are
supposed to use the new driver-specific option.
Reviewed-by: Daniel P. Berrange <berrange@redhat.com>
Reviewed-by: Fam Zheng <famz@redhat.com>
Signed-off-by: Kevin Wolf <kwolf@redhat.com>
Signed-off-by: Jeff Cody <jcody@redhat.com>
This was previously only available with -iscsi. Again, after this patch,
the -iscsi option only takes effect if an URL is given. New users are
supposed to use the new driver-specific option.
Reviewed-by: Daniel P. Berrange <berrange@redhat.com>
Reviewed-by: Fam Zheng <famz@redhat.com>
Signed-off-by: Kevin Wolf <kwolf@redhat.com>
Signed-off-by: Jeff Cody <jcody@redhat.com>
This splits the logic in the old parse_chap() function into a part that
parses the -iscsi options into the new driver-specific options, and
another part that actually applies those options (called apply_chap()
now).
Note that this means that username and password specified with -iscsi
only take effect when a URL is provided. This is intentional, -iscsi is
a legacy interface only supported for compatibility, new users should
use the proper driver-specific options.
Reviewed-by: Fam Zheng <famz@redhat.com>
Signed-off-by: Kevin Wolf <kwolf@redhat.com>
Signed-off-by: Jeff Cody <jcody@redhat.com>
This introduces a .bdrv_parse_filename handler for iscsi which parses an
URL if given and translates it to individual options.
Reviewed-by: Fam Zheng <famz@redhat.com>
Signed-off-by: Kevin Wolf <kwolf@redhat.com>
Signed-off-by: Jeff Cody <jcody@redhat.com>
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Merge remote-tracking branch 'remotes/armbru/tags/pull-block-2017-02-21' into staging
Changes to -drive without if= and with if=scsi
# gpg: Signature made Tue 21 Feb 2017 12:22:35 GMT
# gpg: using RSA key 0x3870B400EB918653
# gpg: Good signature from "Markus Armbruster <armbru@redhat.com>"
# gpg: aka "Markus Armbruster <armbru@pond.sub.org>"
# Primary key fingerprint: 354B C8B3 D7EB 2A6B 6867 4E5F 3870 B400 EB91 8653
* remotes/armbru/tags/pull-block-2017-02-21:
hw/i386: Deprecate -drive if=scsi with PC machine types
hw: Deprecate -drive if=scsi with non-onboard HBAs
hw/scsi: Concentrate -drive if=scsi auto-create in one place
hw: Drop superfluous special checks for orphaned -drive
blockdev: Make orphaned -drive fatal
blockdev: Improve message for orphaned -drive
hw/arm/highbank: Default -drive to if=ide instead of if=scsi
hw: Default -drive to if=none instead of scsi when scsi cannot work
hw: Default -drive to if=none instead of ide when ide cannot work
hw/arm/cubieboard hw/arm/xlnx-ep108: Fix units_per_default_bus
hw: Default -drive to if=ide explicitly where it works
Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
The PC machines (pc-q35-* pc-i440fx-* pc-* isapc xenfv) automatically
create lsi53c895a SCSI HBAs and SCSI devices to honor -drive if=scsi.
For giggles, try -drive if=scsi,bus=25,media=cdrom --- this makes QEMU
create 25 of them.
lsi53c895a is thoroughly obsolete (PCI Ultra2 SCSI, ca. 2000), and
currently has no maintainer in QEMU. megasas is a better choice,
except with old OSes that lack drivers. virtio-scsi is a much better
choice when you have a driver, but only (newish) Linux comes with one
in the box. There is no good default that works for all guests.
Encourage users to pick a non-obsolete SCSI HBA that works for them by
deprecating -drive if=scsi.
Signed-off-by: Markus Armbruster <armbru@redhat.com>
Message-Id: <1487161136-9018-4-git-send-email-armbru@redhat.com>
Acked-By: Paolo Bonzini <pbonzini@redhat.com>
Block backends defined with "-drive if=T" with T other than "none" are
meant to be picked up by machine initialization code: a suitable
frontend gets created and wired up automatically.
Drives defined with if=scsi are also picked up by SCSI HBAs added with
-device, unlike other interface types. Deprecate this usage, as follows.
Create the frontends for onboard HBAs in machine initialization code,
exactly like we do for if=ide and other interface types. Change
scsi_legacy_handle_cmdline() to create a frontend only when it's still
missing, and warn that this usage is deprecated.
Signed-off-by: Markus Armbruster <armbru@redhat.com>
Message-Id: <1487161136-9018-3-git-send-email-armbru@redhat.com>
The logic to create frontends for -drive if=scsi is in SCSI HBAs. For
all other interface types, it's in machine initialization code.
A few machine types create the SCSI HBAs necessary for that. That's
also not done for other interface types.
I'm going to deprecate these SCSI eccentricities. In preparation for
that, create the frontends in main() instead of the SCSI HBAs, by
calling new function scsi_legacy_handle_cmdline() there.
Note that not all SCSI HBAs create frontends. Take care not to change
that.
Signed-off-by: Markus Armbruster <armbru@redhat.com>
Message-Id: <1487161136-9018-2-git-send-email-armbru@redhat.com>
Acked-By: Paolo Bonzini <pbonzini@redhat.com>
We've traditionally rejected orphans here and there, but not
systematically. For instance, the sun4m machines have an onboard SCSI
HBA (bus=0), and have always rejected bus>0. Other machines with an
onboard SCSI HBA don't.
Commit a66c9dc made all orphans trigger a warning, and the previous
commit turned this into an error. The checks "here and there" are now
redundant. Drop them.
Note that the one in mips_jazz.c was wrong: it rejected bus > MAX_FD,
but MAX_FD is the number of floppy drives per bus.
Error messages change from
$ qemu-system-x86_64 -drive if=ide,bus=2
qemu-system-x86_64: Too many IDE buses defined (3 > 2)
$ qemu-system-mips64 -M magnum,accel=qtest -drive if=floppy,bus=2,id=fd1
qemu: too many floppy drives
$ qemu-system-sparc -M LX -drive if=scsi,bus=1
qemu: too many SCSI bus
to
$ qemu-system-x86_64 -drive if=ide,bus=2
qemu-system-x86_64: -drive if=ide,bus=2: machine type does not support if=ide,bus=2,unit=0
$ qemu-system-mips64 -M magnum,accel=qtest -drive if=floppy,bus=2,id=fd1
qemu-system-mips64: -drive if=floppy,bus=2,id=fd1: machine type does not support if=floppy,bus=2,unit=0
$ qemu-system-sparc -M LX -drive if=scsi,bus=1
qemu-system-sparc: -drive if=scsi,bus=1: machine type does not support if=scsi,bus=1,unit=0
Cc: John Snow <jsnow@redhat.com>
Cc: "Hervé Poussineau" <hpoussin@reactos.org>
Cc: Mark Cave-Ayland <mark.cave-ayland@ilande.co.uk>
Signed-off-by: Markus Armbruster <armbru@redhat.com>
Message-Id: <1487153147-11530-9-git-send-email-armbru@redhat.com>
Reviewed-by: John Snow <jsnow@redhat.com>
Block backends defined with "-drive if=T" with T other than "none" are
meant to be picked up by machine initialization code: a suitable
frontend gets created and wired up automatically.
If machine initialization code doesn't comply, the block backend
remains unused. This triggers a warning since commit a66c9dc, v2.2.0.
Drives created by default are exempted; use -nodefaults to get rid of
them.
Turn this warning into an error.
Signed-off-by: Markus Armbruster <armbru@redhat.com>
Message-Id: <1487153147-11530-8-git-send-email-armbru@redhat.com>
Reviewed-by: John Snow <jsnow@redhat.com>
We warn when a -drive isn't supported by the machine type (commit
a66c9dc):
$ qemu-system-x86_64 -S -display none -drive if=mtd
Warning: Orphaned drive without device: id=mtd0,file=,if=mtd,bus=0,unit=0
Improve this to point to the offending bit of configuration:
qemu-system-x86_64: -drive if=mtd: warning: machine type does not support if=mtd,bus=0,unit=0
Especially nice when it's hidden behind -readconfig foo.cfg:
qemu-system-x86_64:foo.cfg:140: warning: machine type does not support if=mtd,bus=0,unit=0
Signed-off-by: Markus Armbruster <armbru@redhat.com>
Message-Id: <1487153147-11530-7-git-send-email-armbru@redhat.com>
Reviewed-by: John Snow <jsnow@redhat.com>
These machines have no onboard SCSI HBA, and no way to plug one.
-drive if=scsi therefore cannot work. They do have an onboard IDE
controller (sysbus-ahci), but fail to honor if=ide.
Change their default to if=ide, and add a TODO comment on what needs
to be done to actually honor -drive if=ide.
Cc: Rob Herring <robh@kernel.org>
Cc: Peter Maydell <peter.maydell@linaro.org>
Cc: qemu-arm@nongnu.org
Signed-off-by: Markus Armbruster <armbru@redhat.com>
Reviewed-by: Thomas Huth <thuth@redhat.com>
Message-Id: <1487153147-11530-6-git-send-email-armbru@redhat.com>
Block backends defined with -drive if=scsi are meant to be picked up
by machine initialization code: a suitable frontend gets created and
wired up automatically.
if=scsi drives not picked up that way can still be used with -device
as if they had if=none, but that's unclean and best avoided. Unused
ones produce an "Orphaned drive without device" warning.
A few machine types default to if=scsi, even though they don't
actually have a SCSI HBA. This makes no sense. Change their default
to if=none. Affected machines:
* aarch64/arm: realview-pbx-a9 vexpress-a9 vexpress-a15 xilinx-zynq-a9
Cc: Peter Maydell <peter.maydell@linaro.org>
Cc: "Edgar E. Iglesias" <edgar.iglesias@gmail.com>
Cc: Alistair Francis <alistair.francis@xilinx.com>
Cc: qemu-arm@nongnu.org
Signed-off-by: Markus Armbruster <armbru@redhat.com>
Reviewed-by: Thomas Huth <thuth@redhat.com>
Reviewed-by: Alistair Francis <alistair.francis@xilinx.com>
Message-Id: <1487153147-11530-5-git-send-email-armbru@redhat.com>
Block backends defined with -drive if=ide are meant to be picked up by
machine initialization code: a suitable frontend gets created and
wired up automatically.
if=ide drives not picked up that way can still be used with -device as
if they had if=none, but that's unclean and best avoided. Unused ones
produce an "Orphaned drive without device" warning.
-drive parameter "if" is optional, and the default depends on the
machine type. If a machine type doesn't specify a default, the
default is "ide".
Many machine types implicitly default to if=ide that way, even though
they don't actually have an IDE controller. This makes no sense.
Change the implicit default to if=none. Affected machines:
* all targets: none
* aarch64/arm: akita ast2500 canon cheetah collie connex imx25
integratorcp kzm lm3s6965evb lm3s811evb mainstone musicpal n800 n810
netduino2 nuri palmetto realview romulus sabrelite smdkc210 sx1 sx1
verdex z2
* cris: axis-dev88
* i386/x86_64: xenpv
* lm32: lm32-evr lm32-uclinux milkymist
* m68k: an5206 dummy mcf5208evb
* microblaze/microblazeel: petalogix-ml605 petalogix-s3adsp1800
* mips/mips64/mips64el/mipsel: mipssim
* moxie: moxiesim
* or32: or32-sim
* ppc/ppc64/ppcemb: bamboo ref405ep taihu virtex-ml507
* ppc/ppc64: mpc8544ds ppce500
* sh4/sh4eb: shix
* sparc: leon3_generic
* sparc64: niagara
* tricore: tricore_testboard
* unicore32: puv3
* xtensa/xtensaeb: kc705 lx200 lx60 ml605 sim
None of these machines have an IDE controller, let alone code to
honor if=ide.
Cc: Peter Maydell <peter.maydell@linaro.org>
Cc: qemu-arm@nongnu.org
Cc: Edgar E. Iglesias <edgar.iglesias@gmail.com>
Cc: Stefano Stabellini <sstabellini@kernel.org>
Cc: Anthony Perard <anthony.perard@citrix.com>
Cc: xen-devel@lists.xensource.com
Cc: Michael Walle <michael@walle.cc>
Cc: Laurent Vivier <laurent@vivier.eu>
Cc: Anthony Green <green@moxielogic.com>
Cc: Jia Liu <proljc@gmail.com>
Cc: Alexander Graf <agraf@suse.de>
Cc: qemu-ppc@nongnu.org
Cc: Magnus Damm <magnus.damm@gmail.com>
Cc: Fabien Chouteau <chouteau@adacore.com>
Cc: Mark Cave-Ayland <mark.cave-ayland@ilande.co.uk>
Cc: Artyom Tarasenko <atar4qemu@gmail.com>
Cc: Bastian Koppelmann <kbastian@mail.uni-paderborn.de>
Cc: Guan Xuetao <gxt@mprc.pku.edu.cn>
Cc: Max Filippov <jcmvbkbc@gmail.com>
Signed-off-by: Markus Armbruster <armbru@redhat.com>
Acked-By: Artyom Tarasenko <atar4qemu@gmail.com>
Reviewed-by: Laurent Vivier <laurent@vivier.eu>
Reviewed-by: Thomas Huth <thuth@redhat.com>
Message-Id: <1487153147-11530-4-git-send-email-armbru@redhat.com>
Machine types cubieboard, xlnx-ep108, xlnx-zcu102 have an onboard AHCI
controller, but neglect to set their MachineClass member
units_per_default_bus = 1. This permits -drive if=ide,unit=1, which
makes no sense for AHCI. It also screws up index=N for odd N, because
it gets desugared to unit=1,bus=N/2
Doesn't really matter, because these machine types fail to honor
-drive if=ide. Add the missing units_per_default_bus = 1 anyway,
along with a TODO comment on what needs to be done for -drive if=ide.
Also set block_default_type = IF_IDE explicitly. It's currently the
default, but the next commit will change it to something more
sensible, and we want to keep the IF_IDE default for these three
machines. See also the previous commit.
Cc: Beniamino Galvani <b.galvani@gmail.com>
Cc: Alistair Francis <alistair.francis@xilinx.com>
Cc: "Edgar E. Iglesias" <edgar.iglesias@gmail.com>
Cc: Peter Maydell <peter.maydell@linaro.org>
Cc: qemu-arm@nongnu.org
Signed-off-by: Markus Armbruster <armbru@redhat.com>
Acked-by: Alistair Francis <alistair.francis@xilinx.com>
Message-Id: <1487153147-11530-3-git-send-email-armbru@redhat.com>
Block backends defined with -drive if=ide are meant to be picked up by
machine initialization code: a suitable frontend gets created and
wired up automatically.
if=ide drives not picked up that way can still be used with -device as
if they had if=none, but that's unclean and best avoided. Unused ones
produce an "Orphaned drive without device" warning.
-drive parameter "if" is optional, and the default depends on the
machine type. If a machine type doesn't specify a default, the
default is "ide".
Many machine types default to if=ide, even though they don't actually
have an IDE controller. A future patch will change these defaults to
something more sensible. To prepare for it, this patch makes default
"ide" explicit for the machines that actually pick up if=ide drives:
* alpha: clipper
* arm/aarch64: spitz borzoi terrier tosa
* i386/x86_64: generic-pc-machine (with concrete subtypes pc-q35-*
pc-i440fx-* pc-* isapc xenfv)
* mips64el: fulong2e
* mips/mipsel/mips64el: malta mips
* ppc/ppc64: mac99 g3beige prep
* sh4/sh4eb: r2d
* sparc64: sun4u sun4v
Note that ppc64 machine powernv already sets an "ide" default
explicitly. Its IDE controller isn't implemented, yet.
Signed-off-by: Markus Armbruster <armbru@redhat.com>
Reviewed-by: Thomas Huth <thuth@redhat.com>
Message-Id: <1487153147-11530-2-git-send-email-armbru@redhat.com>
v2:
* Rebased to resolve scsi conflicts
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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: 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>
This adds a CoMutex around the existing CoQueue. Because the write-side
can just take CoMutex, the old "writer" field is not necessary anymore.
Instead of removing it altogether, count the number of pending writers
during a read-side critical section and forbid further readers from
entering.
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
Reviewed-by: Fam Zheng <famz@redhat.com>
Message-id: 20170213181244.16297-7-pbonzini@redhat.com
Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com>
All that CoQueue needs in order to become thread-safe is help
from an external mutex. Add this to the API.
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
Reviewed-by: Fam Zheng <famz@redhat.com>
Message-id: 20170213181244.16297-6-pbonzini@redhat.com
Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com>
This will avoid forward references in the next patch. It is also
more logical because CoQueue is not anymore the basic primitive.
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
Reviewed-by: Fam Zheng <famz@redhat.com>
Message-id: 20170213181244.16297-5-pbonzini@redhat.com
Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com>
Add two implementations of the same benchmark as the previous patch,
but using pthreads. One uses a normal QemuMutex, the other is Linux
only and implements a fair mutex based on MCS locks and futexes.
This shows that the slower performance of the 5-thread case is due to
the fairness of CoMutex, rather than to coroutines. If fairness does
not matter, as is the case with two threads, CoMutex can actually be
faster than pthreads.
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
Reviewed-by: Fam Zheng <famz@redhat.com>
Message-id: 20170213181244.16297-4-pbonzini@redhat.com
Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com>
Running a very small critical section on pthread_mutex_t and CoMutex
shows that pthread_mutex_t is much faster because it doesn't actually
go to sleep. What happens is that the critical section is shorter
than the latency of entering the kernel and thus FUTEX_WAIT always
fails. With CoMutex there is no such latency but you still want to
avoid wait and wakeup. So introduce it artificially.
This only works with one waiters; because CoMutex is fair, it will
always have more waits and wakeups than a pthread_mutex_t.
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
Reviewed-by: Fam Zheng <famz@redhat.com>
Message-id: 20170213181244.16297-3-pbonzini@redhat.com
Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com>
