Commit Graph

25434 Commits

Author SHA1 Message Date
Michael Walle
44ac582d80 milkymist-uart: fix receive buffering
Inform qemu-char when more input data can be received.

Signed-off-by: Michael Walle <michael@walle.cc>
2013-03-18 19:40:34 +01:00
Michael Walle
ab2b9f174d lm32-dis: fix NULL pointer dereference
Signed-off-by: Michael Walle <michael@walle.cc>
2013-03-18 19:40:34 +01:00
Michael Walle
b92e062a6f target-lm32: fix debug memory access
CPU models which have the LM32_FLAG_IGNORE_MSB flag set will shadow the
lower 2GB to the upper 2GB memory space. This will fix the debug memory
access used by qemu console and GDB to match this behaviour.

Signed-off-by: Michael Walle <michael@walle.cc>
2013-03-18 19:40:34 +01:00
Anthony Liguori
e531761d63 Merge remote-tracking branch 'kraxel/pixman.v8' into staging
# By Gerd Hoffmann (18) and others
# Via Blue Swirl (1) and Gerd Hoffmann (1)
* kraxel/pixman.v8: (37 commits)
  console: remove ds_get_* helper functions
  console: zap color_table
  console: stop using DisplayState in gfx hardware emulation
  console: zap displaystate from dcl callbacks
  cocoa: stop using DisplayState
  spice: stop using DisplayState
  sdl: stop using DisplayState
  vnc: stop using DisplayState
  gtk: stop using DisplayState
  console: add surface_*() getters
  console: rework DisplaySurface handling [dcl/ui side]
  console: rework DisplaySurface handling [vga emu side]
  sdl: drop dead code
  qxl: better vga init in enter_vga_mode
  qxl: zap qxl0 global
  spice: zap sdpy global
  console: kill DisplayState->opaque
  console: fix displaychangelisteners interface
  s390: Fix cpu refactoring fallout.
  target-mips: fix rndrashift_short_acc and code for EXTR_ instructions
  ...
2013-03-18 07:34:24 -05:00
Gerd Hoffmann
1562e53112 console: remove ds_get_* helper functions
Switch the few remaining ds_get_* uses in console.c over to the new
surface_* accessors.

While doing so tripped over a few leftovers from commit
a93a4a226a (code using depth == 0
as indicator for textmode rendering).  Fixed them up.

Finally dropped ds_get_* helper helpers.

Signed-off-by: Gerd Hoffmann <kraxel@redhat.com>
2013-03-18 10:21:59 +01:00
Gerd Hoffmann
cf6f05481a console: zap color_table
qemu_create_surface hands out 32bpp surfaces.
So we can just use color_table_rgb directly.

Signed-off-by: Gerd Hoffmann <kraxel@redhat.com>
2013-03-18 10:21:59 +01:00
Gerd Hoffmann
c78f71378a console: stop using DisplayState in gfx hardware emulation
Use QemuConsole instead.  Updates interfaces in console.[ch] and adapts
gfx hardware emulation code.

Signed-off-by: Gerd Hoffmann <kraxel@redhat.com>
2013-03-18 10:21:59 +01:00
Gerd Hoffmann
bc2ed9704f console: zap displaystate from dcl callbacks
Now that nobody depends on DisplayState in DisplayChangeListener
callbacks any more we can remove the parameter from all callbacks.

Signed-off-by: Gerd Hoffmann <kraxel@redhat.com>
2013-03-18 10:21:59 +01:00
Gerd Hoffmann
5e00d3ac47 cocoa: stop using DisplayState
Rework DisplayStateListener callbacks to not use the DisplayState
any more.

Signed-off-by: Gerd Hoffmann <kraxel@redhat.com>
2013-03-18 10:21:59 +01:00
Gerd Hoffmann
71874c1751 spice: stop using DisplayState
Rework DisplayStateListener callbacks to not use the DisplayState
any more.

Signed-off-by: Gerd Hoffmann <kraxel@redhat.com>
2013-03-18 10:21:59 +01:00
Gerd Hoffmann
8db9bae94e sdl: stop using DisplayState
Rework DisplayStateListener callbacks to not use the DisplayState
any more.

Signed-off-by: Gerd Hoffmann <kraxel@redhat.com>
2013-03-18 10:21:59 +01:00
Gerd Hoffmann
d39fa6d86d vnc: stop using DisplayState
Rework DisplayStateListener callbacks to not use the DisplayState
any more.

Signed-off-by: Gerd Hoffmann <kraxel@redhat.com>
2013-03-18 10:21:58 +01:00
Gerd Hoffmann
9d9801cf80 gtk: stop using DisplayState
Rework DisplayStateListener callbacks to not use the DisplayState
any more.  Factor out the window size handling to a separate function,
so the zoom callbacks can call that directly instead of abusing the
gd_switch DisplayStateListener callback for that.

Signed-off-by: Gerd Hoffmann <kraxel@redhat.com>
2013-03-18 10:21:58 +01:00
Gerd Hoffmann
626e3b34e3 console: add surface_*() getters
Add convinence wrappers to query DisplaySurface properties.
Simliar to ds_get_*, but operating in the DisplaySurface
not the DisplayState.

With this patch in place ui frontents can stop using DisplayState
in the rendering code paths, they can simply operate using the
DisplaySurface passed in via dpy_gfx_switch callback.

Signed-off-by: Gerd Hoffmann <kraxel@redhat.com>
2013-03-18 10:21:58 +01:00
Gerd Hoffmann
c12aeb860c console: rework DisplaySurface handling [dcl/ui side]
Replace the dpy_gfx_resize and dpy_gfx_setdata DisplayChangeListener
callbacks with a dpy_gfx_switch callback which notifies the ui code
when the framebuffer backing storage changes.

Signed-off-by: Gerd Hoffmann <kraxel@redhat.com>
2013-03-18 10:21:58 +01:00
Gerd Hoffmann
da229ef3b3 console: rework DisplaySurface handling [vga emu side]
Decouple DisplaySurface allocation & deallocation from DisplayState.
Replace dpy_gfx_resize + dpy_gfx_setdata with a dpy_gfx_replace_surface
function.

This handles the graphic hardware emulation.

Signed-off-by: Gerd Hoffmann <kraxel@redhat.com>
2013-03-18 10:21:58 +01:00
Gerd Hoffmann
468dfd6de2 sdl: drop dead code
DisplayAllocator removal (commit
187cd1d9f3) made this a nop.

Signed-off-by: Gerd Hoffmann <kraxel@redhat.com>
2013-03-18 10:21:58 +01:00
Gerd Hoffmann
c099e7aa02 qxl: better vga init in enter_vga_mode
Ask the vga core to update the display.  Will trigger dpy_gfx_resize
if needed.  More complete than just calling dpy_gfx_resize.

Signed-off-by: Gerd Hoffmann <kraxel@redhat.com>
2013-03-18 10:21:58 +01:00
Gerd Hoffmann
c6c06853d9 qxl: zap qxl0 global
DisplayChangeListener is passed now to all DisplayChangeListenerOps
callbacks, so we can use that to access the qxl state and kill the
qxl0 global variable.

Signed-off-by: Gerd Hoffmann <kraxel@redhat.com>
2013-03-18 10:21:58 +01:00
Gerd Hoffmann
9c80a315b4 spice: zap sdpy global
DisplayChangeListener is passed now to all DisplayChangeListenerOps
callbacks, so we can use that to access the spice display state and
kill the sdpy global variable.

Signed-off-by: Gerd Hoffmann <kraxel@redhat.com>
2013-03-18 10:21:58 +01:00
Gerd Hoffmann
21ef45d712 console: kill DisplayState->opaque
It's broken by design.  There can be multiple DisplayChangeListener
instances, so they simply can't store state in the (single) DisplayState
struct.  Try 'qemu -display gtk -vnc :0', watch it crash & burn.

With DisplayChangeListenerOps having a more sane interface now we can
simply use the DisplayChangeListener pointer to get access to our
private data instead.

Signed-off-by: Gerd Hoffmann <kraxel@redhat.com>
2013-03-18 10:21:58 +01:00
Gerd Hoffmann
7c20b4a374 console: fix displaychangelisteners interface
Split callbacks into separate Ops struct.  Pass DisplayChangeListener
pointer as first argument to all callbacks.  Uninline a bunch of
display functions and move them from console.h to console.c

Signed-off-by: Gerd Hoffmann <kraxel@redhat.com>
2013-03-18 10:21:58 +01:00
Cornelia Huck
225dc991b0 s390: Fix cpu refactoring fallout.
Commit 259186a7 "cpu: Move halted and interrupt_request fields to CPUState"
seems to have missed one instance in target-s390x/kvm.c:

/home/cohuck/git/qemu/target-s390x/kvm.c: In function ‘kvm_arch_process_async_events’:
/home/cohuck/git/qemu/target-s390x/kvm.c:319: error: ‘CPUS390XState’ has no member named ‘halted’
/home/cohuck/git/qemu/target-s390x/kvm.c:320: warning: control reaches end of non-void function
make[1]: *** [target-s390x/kvm.o] Error 1

Let's just switch to cs->halted.

Signed-off-by: Cornelia Huck <cornelia.huck@de.ibm.com>
Acked-by: Alexander Graf <agraf@suse.de>
Acked-by: Andreas Färber <afaerber@suse.de>
Signed-off-by: Blue Swirl <blauwirbel@gmail.com>
2013-03-17 20:01:31 +00:00
Blue Swirl
7fb7377594 Merge branch 'arm-devs.next' of git://git.linaro.org/people/pmaydell/qemu-arm
* 'arm-devs.next' of git://git.linaro.org/people/pmaydell/qemu-arm:
  xilinx_spips: QOM styling fixes
  xilinx_spips: Add missing dual-bus snoop commands
  xilinx_spips: Fix bus setup conditional check
  xilinx_spips: Set unused IRQs to NULL
  xilinx_zynq: added pl330 to machine model
  pl330: Initial version
  iov: Factor out hexdumper
  hw/vexpress: Set reset values for daughterboard oscillators
  hw/arm_sysctl: Implement SYS_CFG_OSC function
  hw/vexpress: Pass voltage sensor properties to sysctl device
  hw/arm_sysctl: Implement SYS_CFG_VOLT
  qdev: Implement (variable length) array properties
  hw/arm_sysctl: Convert from qdev init to instance_init
  hw/arm_sysctl: Implement SYS_CFG_DVIMODE as a no-op
  hw/arm_sysctl: Implement SYS_CFG_MUXFPGA writes as a no-op
  hw/arm_sysctl: Handle SYS_CFGCTRL in a more structured way
  hw/vexpress: Pass proc_id via VEDBoardInfo
2013-03-17 17:44:47 +00:00
Petar Jovanovic
8b758d0568 target-mips: fix rndrashift_short_acc and code for EXTR_ instructions
Fix for rndrashift_short_acc to set correct value to higher 64 bits.
This change also corrects conditions when bit 23 of the DSPControl register
is set.

The existing test files have been extended with several examples that
trigger the issues. One bug/example in the test file for EXTR_RS_W has been
found and reported by Klaus Peichl.

Signed-off-by: Petar Jovanovic <petar.jovanovic@imgtec.com>
Signed-off-by: Aurelien Jarno <aurelien@aurel32.net>
2013-03-17 01:06:34 +01:00
Peter Crosthwaite
f8b9fe249a xilinx_spips: QOM styling fixes
Few fixes for the latest QOM styling guides.

Signed-off-by: Peter Crosthwaite <peter.crosthwaite@xilinx.com>
Message-id: de9daeee6c142e8b57ad042fd680cedcdc94d2fc.1362373359.git.peter.crosthwaite@xilinx.com
Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
2013-03-15 16:41:59 +00:00
Nathan Rossi
08a9635b68 xilinx_spips: Add missing dual-bus snoop commands
Added additional commands to the switch to check for when snooping commands in
dual bus mode setups. Cleaned up code to use an enum.

Signed-off-by: Nathan Rossi <nathan.rossi@xilinx.com>
Signed-off-by: Peter Crosthwaite <peter.crosthwaite@xilinx.com>
Message-id: 848c116c711dab0af10729a487968384aadd9faf.1362373359.git.peter.crosthwaite@xilinx.com
Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
2013-03-15 16:41:59 +00:00
Nathan Rossi
e0891bd8bf xilinx_spips: Fix bus setup conditional check
The R_LQPSI_CFG register has the LQSPI_CFG_SEP_BUS and LQSPI_CFG_TWO_MEM bits.

Signed-off-by: Nathan Rossi <nathan.rossi@xilinx.com>
Signed-off-by: Peter Crosthwaite <peter.crosthwaite@xilinx.com>
Message-id: d76c8e364c80a42352ae4f0661aff2cd17ad32a4.1362373359.git.peter.crosthwaite@xilinx.com
Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
2013-03-15 16:41:59 +00:00
Peter Crosthwaite
2790cd911e xilinx_spips: Set unused IRQs to NULL
Unused CS lines should init to 0 to avoid segfaulting when accessing an
unattached QSPI controller.

Signed-off-by: Peter Crosthwaite <peter.crosthwaite@xilinx.com>
Message-id: c1e45198032106e69e8fe9339fc2e6348d524fcd.1362373359.git.peter.crosthwaite@xilinx.com
Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
2013-03-15 16:41:58 +00:00
Peter Crosthwaite
7451afb671 xilinx_zynq: added pl330 to machine model
Signed-off-by: Peter Crosthwaite <peter.crosthwaite@xilinx.com>
Reviewed-by: Peter Maydell <peter.maydell@linaro.org>
Message-id: 5bc295bd2aa50dfe573f428574dbd7d8add7b3f8.1361853677.git.peter.crosthwaite@xilinx.com
Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
2013-03-15 16:41:58 +00:00
Peter Crosthwaite
06a1cea5f6 pl330: Initial version
Device model for Primecell PL330 DMA controller.

Signed-off-by: Peter Crosthwaite <peter.crosthwaite@xilinx.com>
Signed-off-by: Kirill Batuzov <batuzovk@ispras.ru>
Tested-by: Igor Mitsyanko <i.mitsyanko@samsung.com>
Reviewed-by: Igor Mitsyanko <i.mitsyanko@samsung.com>
Reviewed-by: Peter Maydell <peter.maydell@linaro.org>
Message-id: 098aac26233d7334bed2bca4f06f539638ca6d24.1361853677.git.peter.crosthwaite@xilinx.com
Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
2013-03-15 16:41:58 +00:00
Peter Crosthwaite
6ff66f50f0 iov: Factor out hexdumper
Factor out the hexdumper functionality from iov for all to use. Useful for
creating verbose debug printfery that dumps packet data.

Signed-off-by: Peter Crosthwaite <peter.crosthwaite@xilinx.com>
Message-id: faaac219c55ea586d3f748befaf5a2788fd271b8.1361853677.git.peter.crosthwaite@xilinx.com
Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
2013-03-15 16:41:58 +00:00
Peter Maydell
9c7d489379 hw/vexpress: Set reset values for daughterboard oscillators
Set the reset values for the VExpress daughterboard oscillators
via the new sysctl properties.

Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
2013-03-15 16:41:58 +00:00
Peter Maydell
1f81f94beb hw/arm_sysctl: Implement SYS_CFG_OSC function
Implement the SYS_CFG_OSC function. Since the idea of
programmable clock rates doesn't make much sense for QEMU,
we simply allow the clock rate to be read back as written.
The number and value of the daughterboard oscillators varies
between daughterboards, so we provide an array property to
allow their reset values to be configured.

Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
2013-03-15 16:41:57 +00:00
Peter Maydell
31410948bc hw/vexpress: Pass voltage sensor properties to sysctl device
Pass voltage sensor properties to the sysctl device. Since
these are daughterboard specific, we specify them via the
VEDBoardInfo structure.

Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
Message-id: 1359985476-29380-9-git-send-email-peter.maydell@linaro.org
2013-03-15 16:41:57 +00:00
Peter Maydell
8bd4824a61 hw/arm_sysctl: Implement SYS_CFG_VOLT
Implement the SYS_CFG_VOLT registers which return the voltage
of various supplies on motherboard and daughterboard. Since
QEMU implements a perfectly stable power supply these registers
always return a constant value. The number and value of the
daughterboard voltages is dependent on the specific daughterboard,
so we use a property array to allow the board to configure them
appropriately.

Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
2013-03-15 16:41:57 +00:00
Peter Maydell
0be6bfac62 qdev: Implement (variable length) array properties
Add support for declaring array properties for qdev devices.
These work by defining an initial static property 'len-arrayname'
which the user of the device should set to the desired size
of the array. When this property is set, memory is allocated
for the array elements, and dynamic properties "arrayname[0]",
"arrayname[1]"... are created so the user of the device can
then set the values of the individual array elements.

Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
2013-03-15 16:41:57 +00:00
Peter Maydell
1f56f50ac4 hw/arm_sysctl: Convert from qdev init to instance_init
Convert this device from old-style qdev init to an instance_init
function. We don't need a realize function yet, though.

Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
2013-03-15 16:41:56 +00:00
Peter Maydell
291155cbc5 hw/arm_sysctl: Implement SYS_CFG_DVIMODE as a no-op
SYS_CFG_DVIMODE allows the guest to select whether the
output DVI signal is VGA, SVGA, XGA, SGA or UXGA. Since
this makes no difference to QEMU, implement writes as a
no-op so Linux doesn't complain.

Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
2013-03-15 16:41:56 +00:00
Peter Maydell
8ff05c9842 hw/arm_sysctl: Implement SYS_CFG_MUXFPGA writes as a no-op
SYS_CFG_MUXFPGA allows the guest to select whether the
video output should come from the motherboard's LCD
controller or the daughterboard's one. Since QEMU doesn't
currently support selecting the video output like this,
implement as a no-op, so Linux doesn't complain about
the register not being implemented.

Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
2013-03-15 16:41:56 +00:00
Peter Maydell
7153832335 hw/arm_sysctl: Handle SYS_CFGCTRL in a more structured way
The SYS_CFGCTRL register consists of separate fields
for DCC, function, site, position and device, as well
as a read/write bit. Refactor the code handling SYS_CFGCTRL
writes to make it easier to add support for functions
like SYS_CFG_OSC which support multiple device fields.
We also pull the handling out into its own function for
clarity, as there are potentially a lot of implementable
subfunctions.

Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
2013-03-15 16:41:56 +00:00
Peter Maydell
cdef10bb93 hw/vexpress: Pass proc_id via VEDBoardInfo
Pass the daughterboard-specific proc_id property to the code that
creates the sysctl device via the VEDBoardInfo struct, rather than
by having the daughterboard init function write to a uint32_t*
argument. This is a cleaner way to pass the info around, and
is in line with the way we are going to handle voltage and
oscillator initialization.

Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
2013-03-15 16:41:56 +00:00
David Gibson
b1999e87b4 Fix TAGS creation
Currently the Makefile creates TAGS for emacs with the command:
    find "$(SRC_PATH)" -name '*.[hc]' -print0 | xargs -0 etags
That works only if xargs ends up invoking etags just once.  If xargs runs
etags several times, as it will if there are enough files, then the later
invocations will overwrite the output from the earlier invocations.  This
patch uses the etags --append option to fix the bug.

Signed-off-by: David Gibson <david@gibson.dropbear.id.au>
Message-id: 1363057048-21534-1-git-send-email-david@gibson.dropbear.id.au
Signed-off-by: Anthony Liguori <aliguori@us.ibm.com>
2013-03-15 11:36:49 -05:00
Anthony Liguori
dc0b0616f7 Merge remote-tracking branch 'stefanha/block' into staging
# By Stefan Hajnoczi (14) and others
# Via Stefan Hajnoczi
* stefanha/block: (28 commits)
  blockdev: Fix up copyright and permission notice
  qemu-iotests: use -nographic in test case 007
  qemu-iotests: add tests for rebasing zero clusters
  dataplane: fix hang introduced by AioContext transition
  coroutine: use AioContext for CoQueue BH
  threadpool: drop global thread pool
  block: add bdrv_get_aio_context()
  aio: add a ThreadPool instance to AioContext
  threadpool: add thread_pool_new() and thread_pool_free()
  threadpool: move globals into struct ThreadPool
  main-loop: add qemu_get_aio_context()
  sheepdog: set io_flush handler in do_co_req
  sheepdog: use non-blocking fd in coroutine context
  qcow2: make is_allocated return true for zero clusters
  qcow2: drop unnecessary flush in qcow2_update_snapshot_refcount()
  qcow2: drop flush in update_cluster_refcount()
  qcow2: flush in qcow2_update_snapshot_refcount()
  qcow2: set L2 cache dependency in qcow2_alloc_bytes()
  qcow2: flush refcount cache correctly in qcow2_write_snapshots()
  qcow2: flush refcount cache correctly in alloc_refcount_block()
  ...
2013-03-15 10:47:21 -05:00
Anthony Liguori
d4d7682484 Merge remote-tracking branch 'cohuck/virtio-ccw-upstr' into staging
# By Christian Borntraeger (1) and Cornelia Huck (1)
# Via Cornelia Huck
* cohuck/virtio-ccw-upstr:
  virtio-ccw: Wire up virtio-rng.
  virtio-ccw: remove qdev_unparent in unplug routing
2013-03-15 10:47:00 -05:00
Markus Armbruster
3618a09402 blockdev: Fix up copyright and permission notice
Screwed up in commit 666daa68.  Thanks to Kevin Wolf for reminding me
to fix this.

Signed-off-by: Markus Armbruster <armbru@redhat.com>
Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com>
2013-03-15 16:07:51 +01:00
Stefan Hajnoczi
804dd41792 qemu-iotests: use -nographic in test case 007
A comment explains that -nographic hangs test case 007.  This is no
longer the case so add -nographic.  This makes the test suite faster and
more pleasant to run since no windows pop up.

I am not sure exactly when -nographic starting working for this case but
there is no fundamental reason why graphics are needed here.  Make sure
the serial port is not on stdio, it would conflict with the monitor.

Also remove unnecessary trailing whitespace on these lines.

Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com>
Tested-by: Kevin Wolf <kwolf@redhat.com>
2013-03-15 16:07:51 +01:00
Paolo Bonzini
acbf30ec60 qemu-iotests: add tests for rebasing zero clusters
If zero clusters are erroneously treated as unallocated, "qemu-img rebase"
will copy the backing file's contents onto the cluster.

The bug existed also in image streaming, but since the root cause was in
qcow2's is_allocated implementation it is enough to test it with qemu-img.

Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com>
2013-03-15 16:07:51 +01:00
Paolo Bonzini
485e3ce88e dataplane: fix hang introduced by AioContext transition
The bug is that the EventNotifiers do have a NULL io_flush callback.
Because _none_ of the callbacks on the dataplane AioContext have such a
callback, aio_poll will simply do nothing.  Fixed by adding the callbacks:
the ioeventfd will always be polled (this can change in the future to
pause/resume the processing during live snapshots or similar operations);
the ioqueue will be polled if there are outstanding requests.

I must admit I have screwed up my testing somehow, because commit
2c20e71 does not work even if cherry-picked on top of 1.4.0, and this
patch fixes it there as well.

Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com>
2013-03-15 16:07:51 +01:00
Stefan Hajnoczi
28f0824696 coroutine: use AioContext for CoQueue BH
CoQueue uses a BH to awake coroutines that were made ready to run again
using qemu_co_queue_next() or qemu_co_queue_restart_all().  The BH
currently runs in the iothread AioContext and would break coroutines
that run in a different AioContext.

This is a slightly tricky problem because the lifetime of the BH exceeds
that of the CoQueue.  This means coroutines can be awoken after CoQueue
itself has been freed.  Also, there is no qemu_co_queue_destroy()
function which we could use to handle freeing resources.

Introducing qemu_co_queue_destroy() has a ripple effect of requiring us
to also add qemu_co_mutex_destroy() and qemu_co_rwlock_destroy(), as
well as updating all callers.  Avoid doing that.

We also cannot switch from BH to GIdle function because aio_poll() does
not dispatch GIdle functions.  (GIdle functions make memory management
slightly easier because they free themselves.)

Finally, I don't want to move unlock_queue and unlock_bh into
AioContext.  That would break encapsulation - AioContext isn't supposed
to know about CoQueue.

This patch implements a different solution: each qemu_co_queue_next() or
qemu_co_queue_restart_all() call creates a new BH and list of coroutines
to wake up.  Callers tend to invoke qemu_co_queue_next() and
qemu_co_queue_restart_all() occasionally after blocking I/O, so creating
a new BH for each call shouldn't be massively inefficient.

Note that this patch does not add an interface for specifying the
AioContext.  That is left to future patches which will convert CoQueue,
CoMutex, and CoRwlock to expose AioContext.

Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com>
Reviewed-by: Paolo Bonzini <pbonzini@redhat.com>
2013-03-15 16:07:51 +01:00