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2021-06-02docs: fix references to docs/devel/tracing.rstStefano Garzarella1-1/+1
Commit e50caf4a5c ("tracing: convert documentation to rST") converted docs/devel/tracing.txt to docs/devel/tracing.rst. We still have several references to the old file, so let's fix them with the following command: sed -i s/tracing.txt/tracing.rst/ $(git grep -l docs/devel/tracing.txt) Signed-off-by: Stefano Garzarella <sgarzare@redhat.com> Reviewed-by: Philippe Mathieu-Daudé <philmd@redhat.com> Message-Id: <20210517151702.109066-2-sgarzare@redhat.com> Signed-off-by: Thomas Huth <thuth@redhat.com>
2021-05-02Do not include exec/address-spaces.h if it's not really necessaryThomas Huth1-1/+0
Stop including exec/address-spaces.h in files that don't need it. Signed-off-by: Thomas Huth <thuth@redhat.com> Message-Id: <20210416171314.2074665-5-thuth@redhat.com> Signed-off-by: Laurent Vivier <laurent@vivier.eu>
2021-05-02hw: Do not include qemu/log.h if it is not necessaryThomas Huth1-1/+0
Many files include qemu/log.h without needing it. Remove the superfluous include statements. Signed-off-by: Thomas Huth <thuth@redhat.com> Reviewed-by: Alistair Francis <alistair.francis@wdc.com> Message-Id: <20210328054833.2351597-1-thuth@redhat.com> Signed-off-by: Laurent Vivier <laurent@vivier.eu>
2021-05-02hw: Do not include hw/sysbus.h if it is not necessaryThomas Huth1-1/+0
Many files include hw/sysbus.h without needing it. Remove the superfluous include statements. Signed-off-by: Thomas Huth <thuth@redhat.com> Reviewed-by: Philippe Mathieu-Daudé <f4bug@amsat.org> Message-Id: <20210327082804.2259480-1-thuth@redhat.com> Signed-off-by: Laurent Vivier <laurent@vivier.eu>
2021-02-05pci: add romsize propertyPaolo Bonzini1-2/+12
This property can be useful for distros to set up known-good ROM sizes for migration purposes. The VM will fail to start if the ROM is too large, and migration compatibility will not be broken if the ROM is too small. Note that even though romsize is a uint32_t, it has to be between 1 (because empty ROM files are not accepted, and romsize must be greater than the file) and 2^31 (because values above are not powers of two and are rejected). Signed-off-by: Paolo Bonzini <pbonzini@redhat.com> Reviewed-by: Dr. David Alan Gilbert <dgilbert@redhat.com> Reviewed-by: Peter Xu <peterx@redhat.com> Message-Id: <20201218182736.1634344-1-pbonzini@redhat.com> Signed-off-by: Paolo Bonzini <pbonzini@redhat.com> Message-Id: <20210203131828.156467-3-pbonzini@redhat.com> Reviewed-by: Michael S. Tsirkin <mst@redhat.com> Signed-off-by: Michael S. Tsirkin <mst@redhat.com> Reviewed-by: David Edmondson <david.edmondson@oracle.com> Acked-by: Laszlo Ersek <lersek@redhat.com>
2020-12-18qdev: Move softmmu properties to qdev-properties-system.hEduardo Habkost1-0/+1
Move the property types and property macros implemented in qdev-properties-system.c to a new qdev-properties-system.h header. Signed-off-by: Eduardo Habkost <ehabkost@redhat.com> Reviewed-by: Igor Mammedov <imammedo@redhat.com> Message-Id: <20201211220529.2290218-16-ehabkost@redhat.com> Signed-off-by: Eduardo Habkost <ehabkost@redhat.com>
2020-12-13hw/xen: Don't use '#' flag of printf formatXinhao Zhang3-16/+16
Fix code style. Don't use '#' flag of printf format ('%#') in format strings, use '0x' prefix instead Signed-off-by: Xinhao Zhang <zhangxinhao1@huawei.com> Signed-off-by: Kai Deng <dengkai1@huawei.com> Message-Id: <20201104133709.3326630-1-zhangxinhao1@huawei.com> Signed-off-by: Laurent Vivier <laurent@vivier.eu>
2020-11-15nomaintainer: Fix Lesser GPL version numberChetan Pant1-1/+1
There is no "version 2" of the "Lesser" General Public License. It is either "GPL version 2.0" or "Lesser GPL version 2.1". This patch replaces all occurrences of "Lesser GPL version 2" with "Lesser GPL version 2.1" in comment section. This patch contains all the files, whose maintainer I could not get from ‘get_maintainer.pl’ script. Signed-off-by: Chetan Pant <chetan4windows@gmail.com> Message-Id: <20201023124424.20177-1-chetan4windows@gmail.com> Reviewed-by: Thomas Huth <thuth@redhat.com> [thuth: Adapted exec.c and qdev-monitor.c to new location] Signed-off-by: Thomas Huth <thuth@redhat.com>
2020-10-19xen-bus: reduce scope of backend watchPaul Durrant2-8/+43
Currently a single watch on /local/domain/X/backend is registered by each QEMU process running in service domain X (where X is usually 0). The purpose of this watch is to ensure that QEMU is notified when the Xen toolstack creates a new device backend area. Such a backend area is specific to a single frontend area created for a specific guest domain and, since each QEMU process is also created to service a specfic guest domain, it is unnecessary and inefficient to notify all QEMU processes. Only the QEMU process associated with the same guest domain need receive the notification. This patch re-factors the watch registration code such that notifications are targetted appropriately. Reported-by: Jerome Leseinne <jerome.leseinne@gmail.com> Signed-off-by: Paul Durrant <pdurrant@amazon.com> Reviewed-by: Anthony PERARD <anthony.perard@citrix.com> Message-Id: <20201001081500.1026-1-paul@xen.org> Signed-off-by: Anthony PERARD <anthony.perard@citrix.com>
2020-09-18Use OBJECT_DECLARE_SIMPLE_TYPE when possibleEduardo Habkost1-3/+1
This converts existing DECLARE_INSTANCE_CHECKER usage to OBJECT_DECLARE_SIMPLE_TYPE when possible. $ ./scripts/codeconverter/converter.py -i \ --pattern=AddObjectDeclareSimpleType $(git grep -l '' -- '*.[ch]') Signed-off-by: Eduardo Habkost <ehabkost@redhat.com> Acked-by: Paul Durrant <paul@xen.org> Message-Id: <20200916182519.415636-6-ehabkost@redhat.com> Signed-off-by: Eduardo Habkost <ehabkost@redhat.com>
2020-09-09Use DECLARE_*CHECKER* macrosEduardo Habkost1-2/+2
Generated using: $ ./scripts/codeconverter/converter.py -i \ --pattern=TypeCheckMacro $(git grep -l '' -- '*.[ch]') Reviewed-by: Daniel P. Berrangé <berrange@redhat.com> Reviewed-by: Juan Quintela <quintela@redhat.com> Message-Id: <20200831210740.126168-12-ehabkost@redhat.com> Reviewed-by: Juan Quintela <quintela@redhat.com> Message-Id: <20200831210740.126168-13-ehabkost@redhat.com> Message-Id: <20200831210740.126168-14-ehabkost@redhat.com> Signed-off-by: Eduardo Habkost <ehabkost@redhat.com>
2020-09-09Move QOM typedefs and add missing includesEduardo Habkost1-0/+1
Some typedefs and macros are defined after the type check macros. This makes it difficult to automatically replace their definitions with OBJECT_DECLARE_TYPE. Patch generated using: $ ./scripts/codeconverter/converter.py -i \ --pattern=QOMStructTypedefSplit $(git grep -l '' -- '*.[ch]') which will split "typdef struct { ... } TypedefName" declarations. Followed by: $ ./scripts/codeconverter/converter.py -i --pattern=MoveSymbols \ $(git grep -l '' -- '*.[ch]') which will: - move the typedefs and #defines above the type check macros - add missing #include "qom/object.h" lines if necessary Reviewed-by: Daniel P. Berrangé <berrange@redhat.com> Reviewed-by: Juan Quintela <quintela@redhat.com> Message-Id: <20200831210740.126168-9-ehabkost@redhat.com> Reviewed-by: Juan Quintela <quintela@redhat.com> Message-Id: <20200831210740.126168-10-ehabkost@redhat.com> Message-Id: <20200831210740.126168-11-ehabkost@redhat.com> Signed-off-by: Eduardo Habkost <ehabkost@redhat.com>
2020-08-21meson: convert hw/xenMarc-André Lureau2-7/+20
Signed-off-by: Marc-André Lureau <marcandre.lureau@redhat.com> Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
2020-08-21trace: switch position of headers to what Meson requiresPaolo Bonzini1-0/+1
Meson doesn't enjoy the same flexibility we have with Make in choosing the include path. In particular the tracing headers are using $(build_root)/$(<D). In order to keep the include directives unchanged, the simplest solution is to generate headers with patterns like "trace/trace-audio.h" and place forwarding headers in the source tree such that for example "audio/trace.h" includes "trace/trace-audio.h". This patch is too ugly to be applied to the Makefiles now. It's only a way to separate the changes to the tracing header files from the Meson rewrite of the tracing logic. Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
2020-07-13osdep.h: Always include <sys/signal.h> if it existsDavid CARLIER1-1/+0
Regularize our handling of <sys/signal.h>: currently we include it in osdep.h, but only for OpenBSD, and we include it without an ifdef guard in a couple of C files. This causes problems for Haiku, which doesn't have that header. Instead, check in configure whether sys/signal.h exists, and if it does then always include it from osdep.h. Signed-off-by: David Carlier <devnexen@gmail.com> Reviewed-by: Peter Maydell <peter.maydell@linaro.org> Reviewed-by: Thomas Huth <thuth@redhat.com> Reviewed-by: Philippe Mathieu-Daudé <philmd@redhat.com> Signed-off-by: Peter Maydell <peter.maydell@linaro.org> Message-id: 20200703145614.16684-5-peter.maydell@linaro.org [PMM: Expanded commit message; rename to HAVE_SYS_SIGNAL_H] Reviewed-by: Peter Maydell <peter.maydell@linaro.org> Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
2020-07-11Merge remote-tracking branch 'remotes/aperard/tags/pull-xen-20200710' into ↵Peter Maydell1-2/+2
staging xen patches Fixes following harden checks in qdev. # gpg: Signature made Fri 10 Jul 2020 14:05:46 BST # gpg: using RSA key F80C006308E22CFD8A92E7980CF5572FD7FB55AF # gpg: issuer "anthony.perard@citrix.com" # gpg: Good signature from "Anthony PERARD <anthony.perard@gmail.com>" [marginal] # gpg: aka "Anthony PERARD <anthony.perard@citrix.com>" [marginal] # 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: 5379 2F71 024C 600F 778A 7161 D8D5 7199 DF83 42C8 # Subkey fingerprint: F80C 0063 08E2 2CFD 8A92 E798 0CF5 572F D7FB 55AF * remotes/aperard/tags/pull-xen-20200710: xen: cleanup unrealized flash devices xen: Fix xen-legacy-backend qdev types Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
2020-07-10xen: Use ERRP_GUARD()Vladimir Sementsov-Ogievskiy5-93/+75
If we want to check error after errp-function call, we need to introduce local_err and then propagate it to errp. Instead, use the ERRP_GUARD() macro, benefits are: 1. No need of explicit error_propagate call 2. No need of explicit local_err variable: use errp directly 3. ERRP_GUARD() leaves errp as is if it's not NULL or &error_fatal, this means that we don't break error_abort (we'll abort on error_set, not on error_propagate) If we want to add some info to errp (by error_prepend() or error_append_hint()), we must use the ERRP_GUARD() macro. Otherwise, this info will not be added when errp == &error_fatal (the program will exit prior to the error_append_hint() or error_prepend() call). No such cases are being fixed here. This commit is generated by command sed -n '/^X86 Xen CPUs$/,/^$/{s/^F: //p}' MAINTAINERS | \ xargs git ls-files | grep '\.[hc]$' | \ xargs spatch \ --sp-file scripts/coccinelle/errp-guard.cocci \ --macro-file scripts/cocci-macro-file.h \ --in-place --no-show-diff --max-width 80 Reported-by: Kevin Wolf <kwolf@redhat.com> Reported-by: Greg Kurz <groug@kaod.org> Signed-off-by: Vladimir Sementsov-Ogievskiy <vsementsov@virtuozzo.com> Reviewed-by: Philippe Mathieu-Daudé <philmd@redhat.com> [Commit message tweaked] Signed-off-by: Markus Armbruster <armbru@redhat.com> Message-Id: <20200707165037.1026246-9-armbru@redhat.com> [ERRP_AUTO_PROPAGATE() renamed to ERRP_GUARD(), and auto-propagated-errp.cocci to errp-guard.cocci. Commit message tweaked again.]
2020-07-10error: Avoid unnecessary error_propagate() after error_setg()Markus Armbruster1-2/+1
Replace error_setg(&err, ...); error_propagate(errp, err); by error_setg(errp, ...); Related pattern: if (...) { error_setg(&err, ...); goto out; } ... out: error_propagate(errp, err); return; When all paths to label out are that way, replace by if (...) { error_setg(errp, ...); return; } and delete the label along with the error_propagate(). When we have at most one other path that actually needs to propagate, and maybe one at the end that where propagation is unnecessary, e.g. foo(..., &err); if (err) { goto out; } ... bar(..., &err); out: error_propagate(errp, err); return; move the error_propagate() to where it's needed, like if (...) { foo(..., &err); error_propagate(errp, err); return; } ... bar(..., errp); return; and transform the error_setg() as above. In some places, the transformation results in obviously unnecessary error_propagate(). The next few commits will eliminate them. Bonus: the elimination of gotos will make later patches in this series easier to review. Candidates for conversion tracked down with this Coccinelle script: @@ identifier err, errp; expression list args; @@ - error_setg(&err, args); + error_setg(errp, args); ... when != err error_propagate(errp, err); Signed-off-by: Markus Armbruster <armbru@redhat.com> Reviewed-by: Eric Blake <eblake@redhat.com> Message-Id: <20200707160613.848843-34-armbru@redhat.com>
2020-07-10xen: Fix xen-legacy-backend qdev typesJason Andryuk1-2/+2
xen-sysdev is a TYPE_SYS_BUS_DEVICE. bus_type should not be changed so that it can plug into the System bus. Otherwise this assert triggers: qemu-system-i386: hw/core/qdev.c:102: qdev_set_parent_bus: Assertion `dc->bus_type && object_dynamic_cast(OBJECT(bus), dc->bus_type)' failed. TYPE_XENBACKEND attaches to TYPE_XENSYSBUS, so its class_init needs to be set accordingly to attach the qdev. Otherwise the following assert triggers: qemu-system-i386: hw/core/qdev.c:102: qdev_set_parent_bus: Assertion `dc->bus_type && object_dynamic_cast(OBJECT(bus), dc->bus_type)' failed. TYPE_XENBACKEND is not a subclass of XEN_XENSYSDEV, so it's parent is just TYPE_DEVICE. Change that. Signed-off-by: Jason Andryuk <jandryuk@gmail.com> Acked-by: Paul Durrant <pdurrant@amazon.com> Fixes: 81cb05732efb ("qdev: Assert devices are plugged into a bus that can take them") Message-Id: <20200624121939.10282-1-jandryuk@gmail.com> Signed-off-by: Anthony PERARD <anthony.perard@citrix.com>
2020-07-02qdev: Drop qbus_set_bus_hotplug_handler() parameter @errpMarkus Armbruster2-2/+2
All callers pass &error_abort. Drop the parameter. Cc: Paolo Bonzini <pbonzini@redhat.com> Cc: "Daniel P. Berrangé" <berrange@redhat.com> Cc: Eduardo Habkost <ehabkost@redhat.com> Signed-off-by: Markus Armbruster <armbru@redhat.com> Message-Id: <20200630090351.1247703-14-armbru@redhat.com>
2020-06-26xen: Actually fix build without passthroughAnthony PERARD1-1/+1
Fix typo. Fixes: acd0c9416d48 ("xen: fix build without pci passthrough") Signed-off-by: Anthony PERARD <anthony.perard@citrix.com> Message-Id: <20200619103115.254127-1-anthony.perard@citrix.com> Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
2020-06-15sysbus: Convert to sysbus_realize() etc. with CoccinelleMarkus Armbruster2-2/+2
Convert from qdev_realize(), qdev_realize_and_unref() with null @bus argument to sysbus_realize(), sysbus_realize_and_unref(). Coccinelle script: @@ expression dev, errp; @@ - qdev_realize(DEVICE(dev), NULL, errp); + sysbus_realize(SYS_BUS_DEVICE(dev), errp); @@ expression sysbus_dev, dev, errp; @@ + sysbus_dev = SYS_BUS_DEVICE(dev); - qdev_realize_and_unref(dev, NULL, errp); + sysbus_realize_and_unref(sysbus_dev, errp); - sysbus_dev = SYS_BUS_DEVICE(dev); @@ expression sysbus_dev, dev, errp; expression expr; @@ sysbus_dev = SYS_BUS_DEVICE(dev); ... when != dev = expr; - qdev_realize_and_unref(dev, NULL, errp); + sysbus_realize_and_unref(sysbus_dev, errp); @@ expression dev, errp; @@ - qdev_realize_and_unref(DEVICE(dev), NULL, errp); + sysbus_realize_and_unref(SYS_BUS_DEVICE(dev), errp); @@ expression dev, errp; @@ - qdev_realize_and_unref(dev, NULL, errp); + sysbus_realize_and_unref(SYS_BUS_DEVICE(dev), errp); Whitespace changes minimized manually. Signed-off-by: Markus Armbruster <armbru@redhat.com> Acked-by: Alistair Francis <alistair.francis@wdc.com> Reviewed-by: Philippe Mathieu-Daudé <philmd@redhat.com> Reviewed-by: Paolo Bonzini <pbonzini@redhat.com> Message-Id: <20200610053247.1583243-46-armbru@redhat.com> [Conflicts in hw/misc/empty_slot.c and hw/sparc/leon3.c resolved]
2020-06-15qdev: Convert uses of qdev_set_parent_bus() with CoccinelleMarkus Armbruster1-2/+1
In addition to the qdev_create() patterns converted so far, we have a qdev_set_parent_bus() pattern. Mostly when we embed a device in a parent device rather than allocating it on the heap. This pattern also puts devices in the dangerous "no QOM parent, but plugged into bus" state I explained in recent commit "qdev: New qdev_new(), qdev_realize(), etc." Apply same solution: convert to qdev_realize(). Coccinelle script: @@ expression dev, bus, errp; symbol true; @@ - qdev_set_parent_bus(DEVICE(dev), bus); ... - object_property_set_bool(OBJECT(dev), true, "realized", errp); + qdev_realize(DEVICE(dev), bus, errp); @ depends on !(file in "qdev-monitor.c") && !(file in "hw/core/qdev.c")@ expression dev, bus, errp; symbol true; @@ - qdev_set_parent_bus(dev, bus); ... - object_property_set_bool(OBJECT(dev), true, "realized", errp); + qdev_realize(dev, bus, errp); @@ expression dev, bus; symbol true; @@ - qdev_set_parent_bus(DEVICE(dev), bus); ... - qdev_init_nofail(DEVICE(dev)); + qdev_realize(DEVICE(dev), bus, &error_fatal); Unconverted uses of qdev_set_parent_bus() remain. They'll be converted later in this series. Signed-off-by: Markus Armbruster <armbru@redhat.com> Reviewed-by: Philippe Mathieu-Daudé <philmd@redhat.com> Reviewed-by: Paolo Bonzini <pbonzini@redhat.com> Message-Id: <20200610053247.1583243-12-armbru@redhat.com> [Also convert new hw/virtio/vhost-user-vsock-pci.c]
2020-06-15qdev: Convert uses of qdev_create() with CoccinelleMarkus Armbruster2-4/+4
This is the transformation explained in the commit before previous. Takes care of just one pattern that needs conversion. More to come in this series. Coccinelle script: @ depends on !(file in "hw/arm/highbank.c")@ expression bus, type_name, dev, expr; @@ - dev = qdev_create(bus, type_name); + dev = qdev_new(type_name); ... when != dev = expr - qdev_init_nofail(dev); + qdev_realize_and_unref(dev, bus, &error_fatal); @@ expression bus, type_name, dev, expr; identifier DOWN; @@ - dev = DOWN(qdev_create(bus, type_name)); + dev = DOWN(qdev_new(type_name)); ... when != dev = expr - qdev_init_nofail(DEVICE(dev)); + qdev_realize_and_unref(DEVICE(dev), bus, &error_fatal); @@ expression bus, type_name, expr; identifier dev; @@ - DeviceState *dev = qdev_create(bus, type_name); + DeviceState *dev = qdev_new(type_name); ... when != dev = expr - qdev_init_nofail(dev); + qdev_realize_and_unref(dev, bus, &error_fatal); @@ expression bus, type_name, dev, expr, errp; symbol true; @@ - dev = qdev_create(bus, type_name); + dev = qdev_new(type_name); ... when != dev = expr - object_property_set_bool(OBJECT(dev), true, "realized", errp); + qdev_realize_and_unref(dev, bus, errp); @@ expression bus, type_name, expr, errp; identifier dev; symbol true; @@ - DeviceState *dev = qdev_create(bus, type_name); + DeviceState *dev = qdev_new(type_name); ... when != dev = expr - object_property_set_bool(OBJECT(dev), true, "realized", errp); + qdev_realize_and_unref(dev, bus, errp); The first rule exempts hw/arm/highbank.c, because it matches along two control flow paths there, with different @type_name. Covered by the next commit's manual conversions. Missing #include "qapi/error.h" added manually. Signed-off-by: Markus Armbruster <armbru@redhat.com> Reviewed-by: Paolo Bonzini <pbonzini@redhat.com> Message-Id: <20200610053247.1583243-10-armbru@redhat.com> [Conflicts in hw/misc/empty_slot.c and hw/sparc/leon3.c resolved]
2020-06-12xen: fix build without pci passthroughAnthony PERARD4-4/+39
Xen PCI passthrough support may not be available and thus the global variable "has_igd_gfx_passthru" might be compiled out. Common code should not access it in that case. Unfortunately, we can't use CONFIG_XEN_PCI_PASSTHROUGH directly in xen-common.c so this patch instead move access to the has_igd_gfx_passthru variable via function and those functions are also implemented as stubs. The stubs will be used when QEMU is built without passthrough support. Now, when one will want to enable igd-passthru via the -machine property, they will get an error message if QEMU is built without passthrough support. Fixes: 46472d82322d0 ('xen: convert "-machine igd-passthru" to an accelerator property') Reported-by: Roger Pau Monné <roger.pau@citrix.com> Signed-off-by: Anthony PERARD <anthony.perard@citrix.com> Message-Id: <20200603160442.3151170-1-anthony.perard@citrix.com> Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
2020-06-10accel: Move Xen accelerator code under accel/xen/Philippe Mathieu-Daudé2-220/+1
This code is not related to hardware emulation. Move it under accel/ with the other hypervisors. Reviewed-by: Paul Durrant <paul@xen.org> Signed-off-by: Philippe Mathieu-Daudé <philmd@redhat.com> Message-Id: <20200508100222.7112-1-philmd@redhat.com> Reviewed-by: Juan Quintela <quintela@redhat.com> Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
2020-05-15hw: Remove unnecessary DEVICE() castPhilippe Mathieu-Daudé1-1/+1
The DEVICE() macro is defined as: #define DEVICE(obj) OBJECT_CHECK(DeviceState, (obj), TYPE_DEVICE) which expands to: ((DeviceState *)object_dynamic_cast_assert((Object *)(obj), (name), __FILE__, __LINE__, __func__)) This assertion can only fail when @obj points to something other than its stated type, i.e. when we're in undefined behavior country. Remove the unnecessary DEVICE() casts when we already know the pointer is of DeviceState type. Patch created mechanically using spatch with this script: @@ typedef DeviceState; DeviceState *s; @@ - DEVICE(s) + s Acked-by: David Gibson <david@gibson.dropbear.id.au> Acked-by: Paul Durrant <paul@xen.org> Reviewed-by: Markus Armbruster <armbru@redhat.com> Reviewed-by: Cédric Le Goater <clg@kaod.org> Acked-by: John Snow <jsnow@redhat.com> Reviewed-by: Richard Henderson <richard.henderson@linaro.org> Reviewed-by: Markus Armbruster <armbru@redhat.com> Signed-off-by: Philippe Mathieu-Daudé <f4bug@amsat.org> Message-Id: <20200512070020.22782-4-f4bug@amsat.org>
2020-05-15qdev: Unrealize must not failMarkus Armbruster1-6/+6
Devices may have component devices and buses. Device realization may fail. Realization is recursive: a device's realize() method realizes its components, and device_set_realized() realizes its buses (which should in turn realize the devices on that bus, except bus_set_realized() doesn't implement that, yet). When realization of a component or bus fails, we need to roll back: unrealize everything we realized so far. If any of these unrealizes failed, the device would be left in an inconsistent state. Must not happen. device_set_realized() lets it happen: it ignores errors in the roll back code starting at label child_realize_fail. Since realization is recursive, unrealization must be recursive, too. But how could a partly failed unrealize be rolled back? We'd have to re-realize, which can fail. This design is fundamentally broken. device_set_realized() does not roll back at all. Instead, it keeps unrealizing, ignoring further errors. It can screw up even for a device with no buses: if the lone dc->unrealize() fails, it still unregisters vmstate, and calls listeners' unrealize() callback. bus_set_realized() does not roll back either. Instead, it stops unrealizing. Fortunately, no unrealize method can fail, as we'll see below. To fix the design error, drop parameter @errp from all the unrealize methods. Any unrealize method that uses @errp now needs an update. This leads us to unrealize() methods that can fail. Merely passing it to another unrealize method cannot cause failure, though. Here are the ones that do other things with @errp: * virtio_serial_device_unrealize() Fails when qbus_set_hotplug_handler() fails, but still does all the other work. On failure, the device would stay realized with its resources completely gone. Oops. Can't happen, because qbus_set_hotplug_handler() can't actually fail here. Pass &error_abort to qbus_set_hotplug_handler() instead. * hw/ppc/spapr_drc.c's unrealize() Fails when object_property_del() fails, but all the other work is already done. On failure, the device would stay realized with its vmstate registration gone. Oops. Can't happen, because object_property_del() can't actually fail here. Pass &error_abort to object_property_del() instead. * spapr_phb_unrealize() Fails and bails out when remove_drcs() fails, but other work is already done. On failure, the device would stay realized with some of its resources gone. Oops. remove_drcs() fails only when chassis_from_bus()'s object_property_get_uint() fails, and it can't here. Pass &error_abort to remove_drcs() instead. Therefore, no unrealize method can fail before this patch. device_set_realized()'s recursive unrealization via bus uses object_property_set_bool(). Can't drop @errp there, so pass &error_abort. We similarly unrealize with object_property_set_bool() elsewhere, always ignoring errors. Pass &error_abort instead. Several unrealize methods no longer handle errors from other unrealize methods: virtio_9p_device_unrealize(), virtio_input_device_unrealize(), scsi_qdev_unrealize(), ... Much of the deleted error handling looks wrong anyway. One unrealize methods no longer ignore such errors: usb_ehci_pci_exit(). Several realize methods no longer ignore errors when rolling back: v9fs_device_realize_common(), pci_qdev_unrealize(), spapr_phb_realize(), usb_qdev_realize(), vfio_ccw_realize(), virtio_device_realize(). Signed-off-by: Markus Armbruster <armbru@redhat.com> Reviewed-by: Philippe Mathieu-Daudé <philmd@redhat.com> Reviewed-by: Paolo Bonzini <pbonzini@redhat.com> Message-Id: <20200505152926.18877-17-armbru@redhat.com>
2020-05-15qom: Drop parameter @errp of object_property_add() & friendsMarkus Armbruster1-2/+1
The only way object_property_add() can fail is when a property with the same name already exists. Since our property names are all hardcoded, failure is a programming error, and the appropriate way to handle it is passing &error_abort. Same for its variants, except for object_property_add_child(), which additionally fails when the child already has a parent. Parentage is also under program control, so this is a programming error, too. We have a bit over 500 callers. Almost half of them pass &error_abort, slightly fewer ignore errors, one test case handles errors, and the remaining few callers pass them to their own callers. The previous few commits demonstrated once again that ignoring programming errors is a bad idea. Of the few ones that pass on errors, several violate the Error API. The Error ** argument must be NULL, &error_abort, &error_fatal, or a pointer to a variable containing NULL. Passing an argument of the latter kind twice without clearing it in between is wrong: if the first call sets an error, it no longer points to NULL for the second call. ich9_pm_add_properties(), sparc32_ledma_realize(), sparc32_dma_realize(), xilinx_axidma_realize(), xilinx_enet_realize() are wrong that way. When the one appropriate choice of argument is &error_abort, letting users pick the argument is a bad idea. Drop parameter @errp and assert the preconditions instead. There's one exception to "duplicate property name is a programming error": the way object_property_add() implements the magic (and undocumented) "automatic arrayification". Don't drop @errp there. Instead, rename object_property_add() to object_property_try_add(), and add the obvious wrapper object_property_add(). Signed-off-by: Markus Armbruster <armbru@redhat.com> Reviewed-by: Eric Blake <eblake@redhat.com> Reviewed-by: Paolo Bonzini <pbonzini@redhat.com> Message-Id: <20200505152926.18877-15-armbru@redhat.com> [Two semantic rebase conflicts resolved]
2020-05-15qom: Drop object_property_set_description() parameter @errpMarkus Armbruster1-1/+1
object_property_set_description() and object_class_property_set_description() fail only when property @name is not found. There are 85 calls of object_property_set_description() and object_class_property_set_description(). None of them can fail: * 84 immediately follow the creation of the property. * The one in spapr_rng_instance_init() refers to a property created in spapr_rng_class_init(), from spapr_rng_properties[]. Every one of them still gets to decide what to pass for @errp. 51 calls pass &error_abort, 32 calls pass NULL, one receives the error and propagates it to &error_abort, and one propagates it to &error_fatal. I'm actually surprised none of them violates the Error API. What are we gaining by letting callers handle the "property not found" error? Use when the property is not known to exist is simpler: you don't have to guard the call with a check. We haven't found such a use in 5+ years. Until we do, let's make life a bit simpler and drop the @errp parameter. Signed-off-by: Markus Armbruster <armbru@redhat.com> Reviewed-by: Eric Blake <eblake@redhat.com> Reviewed-by: Paolo Bonzini <pbonzini@redhat.com> Message-Id: <20200505152926.18877-8-armbru@redhat.com> [One semantic rebase conflict resolved]
2020-04-29xen/pt: Fix flawed conversion to realize()Markus Armbruster1-6/+6
The conversion of xen_pt_initfn() to xen_pt_realize() blindly replaced XEN_PT_ERR() by error_setg(). Several error conditions that did not fail xen_pt_initfn() now fail xen_pt_realize(). Unsurprisingly, the cleanup on these errors looks highly suspicious. Revert the inappropriate replacements. Fixes: 5a11d0f7549e24a10e178a9dc8ff5e698031d9a6 Cc: Stefano Stabellini <sstabellini@kernel.org> Cc: Anthony Perard <anthony.perard@citrix.com> Cc: Paul Durrant <paul@xen.org> Cc: xen-devel@lists.xenproject.org Signed-off-by: Markus Armbruster <armbru@redhat.com> Reviewed-by: Paul Durrant <paul@xen.org> Message-Id: <20200422130719.28225-10-armbru@redhat.com>
2020-04-02xen: fixup RAM memory region initializationIgor Mammedov1-0/+7
Since bd457782b3b0 ("x86/pc: use memdev for RAM") Xen machine fails to start with: qemu-system-i386: xen: failed to populate ram at 0 The reason is that xen_ram_alloc() which is called by memory_region_init_ram(), compares memory region with statically allocated 'global' ram_memory memory region that it uses for RAM, and does nothing in case it matches. While it's possible feed machine->ram to xen_ram_alloc() in the same manner to keep that hack working, I'd prefer not to keep that circular dependency and try to untangle that. However it doesn't look trivial to fix, so as temporary fixup opt out Xen machine from memdev based RAM allocation, and let xen_ram_alloc() do its trick for now. Reported-by: Anthony PERARD <anthony.perard@citrix.com> Signed-off-by: Igor Mammedov <imammedo@redhat.com> Message-Id: <20200402145418.5139-1-imammedo@redhat.com> Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
2020-03-16misc: Replace zero-length arrays with flexible array member (automatic)Philippe Mathieu-Daudé1-1/+1
Description copied from Linux kernel commit from Gustavo A. R. Silva (see [3]): --v-- description start --v-- The current codebase makes use of the zero-length array language extension to the C90 standard, but the preferred mechanism to declare variable-length types such as these ones is a flexible array member [1], introduced in C99: struct foo { int stuff; struct boo array[]; }; By making use of the mechanism above, we will get a compiler warning in case the flexible array does not occur last in the structure, which will help us prevent some kind of undefined behavior bugs from being unadvertenly introduced [2] to the Linux codebase from now on. --^-- description end --^-- Do the similar housekeeping in the QEMU codebase (which uses C99 since commit 7be41675f7cb). All these instances of code were found with the help of the following Coccinelle script: @@ identifier s, m, a; type t, T; @@ struct s { ... t m; - T a[0]; + T a[]; }; @@ identifier s, m, a; type t, T; @@ struct s { ... t m; - T a[0]; + T a[]; } QEMU_PACKED; [1] https://gcc.gnu.org/onlinedocs/gcc/Zero-Length.html [2] https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=76497732932f [3] https://git.kernel.org/pub/scm/linux/kernel/git/gustavoars/linux.git/commit/?id=17642a2fbd2c1 Inspired-by: Gustavo A. R. Silva <gustavo@embeddedor.com> Reviewed-by: David Hildenbrand <david@redhat.com> Signed-off-by: Philippe Mathieu-Daudé <philmd@redhat.com> Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
2020-02-27xen-bus/block: explicitly assign event channels to an AioContextPaul Durrant1-4/+23
It is not safe to close an event channel from the QEMU main thread when that channel's poller is running in IOThread context. This patch adds a new xen_device_set_event_channel_context() function to explicitly assign the channel AioContext, and modifies xen_device_bind_event_channel() to initially assign the channel's poller to the QEMU main thread context. The code in xen-block's dataplane is then modified to assign the channel to IOThread context during xen_block_dataplane_start() and de-assign it during in xen_block_dataplane_stop(), such that the channel is always assigned back to main thread context before it is closed. aio_set_fd_handler() already deals with all the necessary synchronization when moving an fd between AioContext-s so no extra code is needed to manage this. Reported-by: Julien Grall <jgrall@amazon.com> Signed-off-by: Paul Durrant <pdurrant@amazon.com> Reviewed-by: Anthony PERARD <anthony.perard@citrix.com> Message-Id: <20191216143451.19024-1-pdurrant@amazon.com> Signed-off-by: Anthony PERARD <anthony.perard@citrix.com>
2020-02-27hw/xen/xen_pt_load_rom: Remove unused includesPhilippe Mathieu-Daudé1-4/+0
xen_pt_load_rom.c does not use any of these includes, remove them. Signed-off-by: Philippe Mathieu-Daudé <philmd@redhat.com> Reviewed-by: Paul Durrant <paul@xen.org> Message-Id: <20191014142246.4538-9-philmd@redhat.com> Signed-off-by: Anthony PERARD <anthony.perard@citrix.com>
2020-02-20Avoid cpu_physical_memory_rw() with a constant is_write argumentPhilippe Mathieu-Daudé1-1/+1
This commit was produced with the included Coccinelle script scripts/coccinelle/exec_rw_const. Inspired-by: Peter Maydell <peter.maydell@linaro.org> Reviewed-by: Richard Henderson <richard.henderson@linaro.org> Signed-off-by: Philippe Mathieu-Daudé <philmd@redhat.com>
2020-02-20Let cpu_[physical]_memory() calls pass a boolean 'is_write' argumentPhilippe Mathieu-Daudé1-1/+1
Use an explicit boolean type. This commit was produced with the included Coccinelle script scripts/coccinelle/exec_rw_const. Signed-off-by: Philippe Mathieu-Daudé <philmd@redhat.com>
2020-01-24qdev: set properties with device_class_set_props()Marc-André Lureau3-4/+4
The following patch will need to handle properties registration during class_init time. Let's use a device_class_set_props() setter. spatch --macro-file scripts/cocci-macro-file.h --sp-file ./scripts/coccinelle/qdev-set-props.cocci --keep-comments --in-place --dir . @@ typedef DeviceClass; DeviceClass *d; expression val; @@ - d->props = val + device_class_set_props(d, val) Signed-off-by: Marc-André Lureau <marcandre.lureau@redhat.com> Message-Id: <20200110153039.1379601-20-marcandre.lureau@redhat.com> Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
2019-12-17xen: convert "-machine igd-passthru" to an accelerator propertyPaolo Bonzini2-0/+20
The first machine property to fall is Xen's Intel integrated graphics passthrough. The "-machine igd-passthru" option does not set anymore a property on the machine object, but desugars to a GlobalProperty on accelerator objects. The setter is very simple, since the value ends up in a global variable, so this patch also provides an example before the more complicated cases that follow it. Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
2019-09-24xen-bus: only set the xen device frontend state if it is missingMark Syms1-16/+31
Some toolstack implementations will set the frontend xenstore keys to Initialising which will then trigger the in guest PV drivers to begin initialising and some implementations will then set their state to Closing. If this has occurred then device realize must not overwrite the frontend keys as then the handshake will stall. Signed-off-by: Mark Syms <mark.syms@citrix.com> Also avoid creating the frontend area if it already exists. Signed-off-by: Paul Durrant <paul.durrant@citrix.com> Reviewed-by: Anthony PERARD <anthony.perard@citrix.com> Message-Id: <20190918115745.39006-1-paul.durrant@citrix.com> Signed-off-by: Anthony PERARD <anthony.perard@citrix.com>
2019-09-24xen: perform XenDevice clean-up in XenBus watch handlerPaul Durrant2-25/+71
Cleaning up offline XenDevice objects directly in xen_device_backend_changed() is dangerous as xen_device_unrealize() will modify the watch list that is being walked. Even the QLIST_FOREACH_SAFE() used in notifier_list_notify() is insufficient as *two* notifiers (for the frontend and backend watches) are removed, thus potentially rendering the 'next' pointer unsafe. The solution is to use the XenBus backend_watch handler to do the clean-up instead, as it is invoked whilst walking a separate watch list. This patch therefore adds a new 'inactive_devices' list to XenBus, to which offline devices are added by xen_device_backend_changed(). The XenBus backend_watch registration is also changed to not only invoke xen_bus_enumerate() but also a new xen_bus_cleanup() function, which will walk 'inactive_devices' and perform the necessary actions. For safety an extra 'online' check is also added to xen_bus_type_enumerate() to make sure that no attempt is made to create a new XenDevice object for a backend that is offline. NOTE: This patch also includes some cosmetic changes: - substitute the local variable name 'backend_state' in xen_bus_type_enumerate() with 'state', since there is no ambiguity with any other state in that context. - change xen_device_state_is_active() to xen_device_frontend_is_active() (and pass a XenDevice directly) since the state tests contained therein only apply to a frontend. - use 'state' rather then 'xendev->backend_state' in xen_device_backend_changed() to shorten the code. Signed-off-by: Paul Durrant <paul.durrant@citrix.com> Reviewed-by: Anthony PERARD <anthony.perard@citrix.com> Message-Id: <20190913082159.31338-4-paul.durrant@citrix.com> Signed-off-by: Anthony PERARD <anthony.perard@citrix.com>
2019-09-24xen: introduce separate XenWatchList for XenDevice objectsPaul Durrant2-14/+60
This patch uses the XenWatchList abstraction to add a separate watch list for each device. This is more scalable than walking a single notifier list for all watches and is also necessary to implement a bug-fix in a subsequent patch. Signed-off-by: Paul Durrant <paul.durrant@citrix.com> Reviewed-by: Anthony Perard <anthony.perard@citrix.com> Message-Id: <20190913082159.31338-3-paul.durrant@citrix.com> Signed-off-by: Anthony PERARD <anthony.perard@citrix.com>
2019-09-24xen / notify: introduce a new XenWatchList abstractionPaul Durrant2-44/+78
Xenstore watch call-backs are already abstracted away from XenBus using the XenWatch data structure but the associated NotifierList manipulation and file handle registration is still open coded in various xen_bus_...() functions. This patch creates a new XenWatchList data structure to allow these interactions to be abstracted away from XenBus as well. This is in preparation for a subsequent patch which will introduce separate watch lists for XenBus and XenDevice objects. NOTE: This patch also introduces a new notifier_list_empty() helper function for the purposes of adding an assertion that a XenWatchList is not freed whilst its associated NotifierList is still occupied. Signed-off-by: Paul Durrant <paul.durrant@citrix.com> Reviewed-by: Anthony Perard <anthony.perard@citrix.com> Message-Id: <20190913082159.31338-2-paul.durrant@citrix.com> Signed-off-by: Anthony PERARD <anthony.perard@citrix.com>
2019-09-24xen-bus: check whether the frontend is active during device reset...Paul Durrant1-1/+1
...not the backend Commit cb323146 "xen-bus: Fix backend state transition on device reset" contained a subtle mistake. The hunk @@ -539,11 +556,11 @@ static void xen_device_backend_changed(void *opaque) /* * If the toolstack (or unplug request callback) has set the backend - * state to Closing, but there is no active frontend (i.e. the - * state is not Connected) then set the backend state to Closed. + * state to Closing, but there is no active frontend then set the + * backend state to Closed. */ if (xendev->backend_state == XenbusStateClosing && - xendev->frontend_state != XenbusStateConnected) { + !xen_device_state_is_active(state)) { xen_device_backend_set_state(xendev, XenbusStateClosed); } mistakenly replaced the check of 'xendev->frontend_state' with a check (now in a helper function) of 'state', which actually equates to 'xendev->backend_state'. This patch fixes the mistake. Fixes: cb3231460747552d70af9d546dc53d8195bcb796 Signed-off-by: Paul Durrant <paul.durrant@citrix.com> Reviewed-by: Anthony PERARD <anthony.perard@citrix.com> Message-Id: <20190910171753.3775-1-paul.durrant@citrix.com> Signed-off-by: Anthony PERARD <anthony.perard@citrix.com>
2019-08-27xen-bus: Avoid rewriting identical values to xenstoreAnthony PERARD1-4/+7
When QEMU receives a xenstore watch event suggesting that the "state" of the frontend changed, it records this in its own state but it also re-write the value back into xenstore even so there were no change. This triggers an unnecessary xenstore watch event which QEMU will process again (and maybe the frontend as well). Also QEMU could potentially write an already old value. Signed-off-by: Anthony PERARD <anthony.perard@citrix.com> Reviewed-by: Paul Durrant <paul.durrant@citrix.com> Message-Id: <20190823101534.465-3-anthony.perard@citrix.com>
2019-08-27xen-bus: Fix backend state transition on device resetAnthony PERARD1-3/+20
When a frontend wants to reset its state and the backend one, it starts with setting "Closing", then waits for the backend (QEMU) to do the same. But when QEMU is setting "Closing" to its state, it triggers an event (xenstore watch) that re-execute xen_device_backend_changed() and set the backend state to "Closed". QEMU should wait for the frontend to set "Closed" before doing the same. Before setting "Closed" to the backend_state, we are also going to check if there is a frontend. If that the case, when the backend state is set to "Closing" the frontend should react and sets its state to "Closing" then "Closed". The backend should wait for that to happen. Fixes: b6af8926fb858c4f1426e5acb2cfc1f0580ec98a Signed-off-by: Anthony PERARD <anthony.perard@citrix.com> Reviewed-by: Paul Durrant <paul.durrant@citrix.com> Message-Id: <20190823101534.465-2-anthony.perard@citrix.com>
2019-08-16sysemu: Split sysemu/runstate.h off sysemu/sysemu.hMarkus Armbruster1-1/+1
sysemu/sysemu.h is a rather unfocused dumping ground for stuff related to the system-emulator. Evidence: * It's included widely: in my "build everything" tree, changing sysemu/sysemu.h still triggers a recompile of some 1100 out of 6600 objects (not counting tests and objects that don't depend on qemu/osdep.h, down from 5400 due to the previous two commits). * It pulls in more than a dozen additional headers. Split stuff related to run state management into its own header sysemu/runstate.h. Touching sysemu/sysemu.h now recompiles some 850 objects. qemu/uuid.h also drops from 1100 to 850, and qapi/qapi-types-run-state.h from 4400 to 4200. Touching new sysemu/runstate.h recompiles some 500 objects. Since I'm touching MAINTAINERS to add sysemu/runstate.h anyway, also add qemu/main-loop.h. Suggested-by: Paolo Bonzini <pbonzini@redhat.com> Signed-off-by: Markus Armbruster <armbru@redhat.com> Message-Id: <20190812052359.30071-30-armbru@redhat.com> Reviewed-by: Alex Bennée <alex.bennee@linaro.org> [Unbreak OS-X build]
2019-08-16Include sysemu/sysemu.h a lot lessMarkus Armbruster2-0/+2
In my "build everything" tree, changing sysemu/sysemu.h triggers a recompile of some 5400 out of 6600 objects (not counting tests and objects that don't depend on qemu/osdep.h). hw/qdev-core.h includes sysemu/sysemu.h since recent commit e965ffa70a "qdev: add qdev_add_vm_change_state_handler()". This is a bad idea: hw/qdev-core.h is widely included. Move the declaration of qdev_add_vm_change_state_handler() to sysemu/sysemu.h, and drop the problematic include from hw/qdev-core.h. Touching sysemu/sysemu.h now recompiles some 1800 objects. qemu/uuid.h also drops from 5400 to 1800. A few more headers show smaller improvement: qemu/notify.h drops from 5600 to 5200, qemu/timer.h from 5600 to 4500, and qapi/qapi-types-run-state.h from 5500 to 5000. Cc: Stefan Hajnoczi <stefanha@redhat.com> Signed-off-by: Markus Armbruster <armbru@redhat.com> Reviewed-by: Alistair Francis <alistair.francis@wdc.com> Reviewed-by: Stefan Hajnoczi <stefanha@redhat.com> Message-Id: <20190812052359.30071-28-armbru@redhat.com> Reviewed-by: Alex Bennée <alex.bennee@linaro.org>
2019-08-16Clean up inclusion of sysemu/sysemu.hMarkus Armbruster1-1/+0
In my "build everything" tree, changing sysemu/sysemu.h triggers a recompile of some 5400 out of 6600 objects (not counting tests and objects that don't depend on qemu/osdep.h). Almost a third of its inclusions are actually superfluous. Delete them. Downgrade two more to qapi/qapi-types-run-state.h, and move one from char/serial.h to char/serial.c. hw/semihosting/config.c, monitor/monitor.c, qdev-monitor.c, and stubs/semihost.c define variables declared in sysemu/sysemu.h without including it. The compiler is cool with that, but include it anyway. This doesn't reduce actual use much, as it's still included into widely included headers. The next commit will tackle that. Signed-off-by: Markus Armbruster <armbru@redhat.com> Reviewed-by: Alistair Francis <alistair.francis@wdc.com> Message-Id: <20190812052359.30071-27-armbru@redhat.com> Reviewed-by: Alex Bennée <alex.bennee@linaro.org>
2019-08-16Include hw/qdev-properties.h lessMarkus Armbruster3-0/+3
In my "build everything" tree, changing hw/qdev-properties.h triggers a recompile of some 2700 out of 6600 objects (not counting tests and objects that don't depend on qemu/osdep.h). Many places including hw/qdev-properties.h (directly or via hw/qdev.h) actually need only hw/qdev-core.h. Include hw/qdev-core.h there instead. hw/qdev.h is actually pointless: all it does is include hw/qdev-core.h and hw/qdev-properties.h, which in turn includes hw/qdev-core.h. Replace the remaining uses of hw/qdev.h by hw/qdev-properties.h. While there, delete a few superfluous inclusions of hw/qdev-core.h. Touching hw/qdev-properties.h now recompiles some 1200 objects. Cc: Paolo Bonzini <pbonzini@redhat.com> Cc: "Daniel P. Berrangé" <berrange@redhat.com> Cc: Eduardo Habkost <ehabkost@redhat.com> Signed-off-by: Markus Armbruster <armbru@redhat.com> Reviewed-by: Eduardo Habkost <ehabkost@redhat.com> Message-Id: <20190812052359.30071-22-armbru@redhat.com>
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