The s390 skeys monitor command needs to write out a plain text
file. Currently it is using the QEMUFile class for this, but
work is ongoing to refactor QEMUFile and eliminate much code
related to it. The only feature qemu_fopen() gives over fopen()
is support for QEMU FD passing, but this can be achieved with
qemu_open() + fdopen() too. Switching to regular stdio FILE
APIs avoids the need to sprintf via an intermedia buffer which
slightly simplifies the code.
Reviewed-by: Eric Blake <eblake@redhat.com>
Signed-off-by: Daniel P. Berrange <berrange@redhat.com>
Reviewed-by: Juan Quintela <quintela@redhat.com>
Message-Id: <1461751518-12128-2-git-send-email-berrange@redhat.com>
Signed-off-by: Amit Shah <amit.shah@redhat.com>
Switch to adding compat properties incrementaly instead of
completly overwriting compat_props per machine type.
That removes data duplication which we have due to nested
[PC|SPAPR]_COMPAT_* macros.
It also allows to set default device properties from
default foo_machine_options() hook, which will be used
in following patch for putting VMGENID device as
a function if ISA bridge on pc/q35 machines.
Suggested-by: Eduardo Habkost <ehabkost@redhat.com>
Signed-off-by: Igor Mammedov <imammedo@redhat.com>
Acked-by: Cornelia Huck <cornelia.huck@de.ibm.com>
Reviewed-by: Eduardo Habkost <ehabkost@redhat.com>
[ehabkost: Fixed CCW_COMPAT_* and PC_COMPAT_0_* defines]
Signed-off-by: Eduardo Habkost <ehabkost@redhat.com>
Move cpu_inject_* to the only C file where they are used.
Move ioinst.h declarations that need S390CPU to cpu.h, to make
ioinst.h independent of cpu.h.
Move channel declarations that only need SubchDev from cpu.h
to css.h, to make more channel users independent of cpu.h.
Acked-by: Cornelia Huck <cornelia.huck@de.ibm.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
The configure/deconfigure sclp commands need a SCCB with a length of
at least 16. Indicate in the response code if this is not fulfilled.
Signed-off-by: Yi Min Zhao <zyimin@linux.vnet.ibm.com>
Reviewed-by: Pierre Morel <pmorel@linux.vnet.ibm.com>
Signed-off-by: Cornelia Huck <cornelia.huck@de.ibm.com>
Enhance error handling for mpcifc_service_call() to propagate errors
to guest by setting status codes or triggering program interrupts.
Signed-off-by: Yi Min Zhao <zyimin@linux.vnet.ibm.com>
Reviewed-by: Pierre Morel <pmorel@linux.vnet.ibm.com>
Signed-off-by: Cornelia Huck <cornelia.huck@de.ibm.com>
When deconfiguring a s390 pci device, we should deconfigure the
corresponding IOMMU memory region and the IRQs for the device.
Signed-off-by: Yi Min Zhao <zyimin@linux.vnet.ibm.com>
Reviewed-by: Pierre Morel <pmorel@linux.vnet.ibm.com>
Signed-off-by: Cornelia Huck <cornelia.huck@de.ibm.com>
We introduce iommu_enabled field for S390PCIBusDevice struct to
track whether the iommu has been enabled for the device. This allows
us to stop temporarily changing ->configured while en/disabling the
iommu and to do conditional cleanup later.
Signed-off-by: Yi Min Zhao <zyimin@linux.vnet.ibm.com>
Reviewed-by: Pierre Morel <pmorel@linux.vnet.ibm.com>
Signed-off-by: Cornelia Huck <cornelia.huck@de.ibm.com>
dereg_irqs and dereg_ioat are needed by external functions. Let's
rename and export both of them in s390-pci-inst.h.
Signed-off-by: Yi Min Zhao <zyimin@linux.vnet.ibm.com>
Reviewed-by: Pierre Morel <pmorel@linux.vnet.ibm.com>
Signed-off-by: Cornelia Huck <cornelia.huck@de.ibm.com>
Split s390_pcihost_iommu_configure() into separate functions for
configuring and deconfiguring in order to make the code more readable.
Signed-off-by: Yi Min Zhao <zyimin@linux.vnet.ibm.com>
Reviewed-by: Pierre Morel <pmorel@linux.vnet.ibm.com>
Signed-off-by: Cornelia Huck <cornelia.huck@de.ibm.com>
Split s390_sclp_configure() into separate functions for sclp
configuring and deconfiguring in order to make the code more readable.
Signed-off-by: Yi Min Zhao <zyimin@linux.vnet.ibm.com>
Reviewed-by: Pierre Morel <pmorel@linux.vnet.ibm.com>
Signed-off-by: Cornelia Huck <cornelia.huck@de.ibm.com>
In reg_irqs(), present code assumes that map_indicator() always issues
successfully. Let's check it and return the error to caller in order to
inform guest.
Signed-off-by: Yi Min Zhao <zyimin@linux.vnet.ibm.com>
Reviewed-by: Cornelia Huck <cornelia.huck@de.ibm.com>
Reviewed-by: Pierre Morel <pmorel@linux.vnet.ibm.com>
Reviewed-by: Dong Jia Shi <bjsdjshi@linux.vnet.ibm.com>
Signed-off-by: Cornelia Huck <cornelia.huck@de.ibm.com>
We don't need to pass device address for pc-bios using gr7 anymore as
the pcbios completely relies on diag308 now, so we can remove it from
qemu. devno, ssid and cssid are migrated but the value was never reused,
so we can safely ignore these fields and migrate 0.
Signed-off-by: Alexander Yarygin <yarygin@linux.vnet.ibm.com>
Reviewed-by: David Hildenbrand <dahi@linux.vnet.ibm.com>
Signed-off-by: Cornelia Huck <cornelia.huck@de.ibm.com>
Add the ssid field to the ipl parameter block struct and fill it when
necessary so the guest can use it.
Signed-off-by: Alexander Yarygin <yarygin@linux.vnet.ibm.com>
Reviewed-by: David Hildenbrand <dahi@linux.vnet.ibm.com>
Signed-off-by: Cornelia Huck <cornelia.huck@de.ibm.com>
Right now we return the ipl parameter block only if the guest
specified one. Let's fill in the parameter block when bootindex
parameter is available and not booting from an external kernel.
Signed-off-by: Alexander Yarygin <yarygin@linux.vnet.ibm.com>
Reviewed-by: David Hildenbrand <dahi@linux.vnet.ibm.com>
Signed-off-by: Cornelia Huck <cornelia.huck@de.ibm.com>
We can check for valid type and lengths of the IplParameterBlock fields
when receiving the struct from the guest.
Length of the IplParameterBlock can be less than 4K. To play safe we can
read and write only required amount of data.
Signed-off-by: Alexander Yarygin <yarygin@linux.vnet.ibm.com>
Reviewed-by: David Hildenband <dahi@linux.vnet.ibm.com>
Acked-by: Christian Borntraeger <borntraeger@de.ibm.com>
Signed-off-by: Cornelia Huck <cornelia.huck@de.ibm.com>
The IplParameterBlock struct currently has only 200 bytes filled, but it
can be up to 4K.
This patch converts the struct to union with a fully populated struct
inside it and second struct with old values.
For compatibility reasons we disable migration of the extended iplb
field for pre-2.7 machines. Also a guest still can read/write only the
first 200 bytes of IPLB for now.
Signed-off-by: Alexander Yarygin <yarygin@linux.vnet.ibm.com>
Reviewed-by: David Hildenbrand <dahi@linux.vnet.ibm.com>
Acked-by: Christian Borntraeger <borntraeger@de.ibm.com>
Signed-off-by: Cornelia Huck <cornelia.huck@de.ibm.com>
Introduce run-time-instrumentation support when running under kvm for
virtio-ccw 2.7 machine and make sure older machines can not enable it.
The new ri_allowed field in the s390MachineClass serves as an indicator
whether the feature can be used by the machine and should therefore be
activated if available.
riccb_needed() is used to check whether riccb is needed or not in live
migration.
Signed-off-by: Fan Zhang <zhangfan@linux.vnet.ibm.com>
Signed-off-by: Cornelia Huck <cornelia.huck@de.ibm.com>
Commit 57cb38b included qapi/error.h into qemu/osdep.h to get the
Error typedef. Since then, we've moved to include qemu/osdep.h
everywhere. Its file comment explains: "To avoid getting into
possible circular include dependencies, this file should not include
any other QEMU headers, with the exceptions of config-host.h,
compiler.h, os-posix.h and os-win32.h, all of which are doing a
similar job to this file and are under similar constraints."
qapi/error.h doesn't do a similar job, and it doesn't adhere to
similar constraints: it includes qapi-types.h. That's in excess of
100KiB of crap most .c files don't actually need.
Add the typedef to qemu/typedefs.h, and include that instead of
qapi/error.h. Include qapi/error.h in .c files that need it and don't
get it now. Include qapi-types.h in qom/object.h for uint16List.
Update scripts/clean-includes accordingly. Update it further to match
reality: replace config.h by config-target.h, add sysemu/os-posix.h,
sysemu/os-win32.h. Update the list of includes in the qemu/osdep.h
comment quoted above similarly.
This reduces the number of objects depending on qapi/error.h from "all
of them" to less than a third. Unfortunately, the number depending on
qapi-types.h shrinks only a little. More work is needed for that one.
Signed-off-by: Markus Armbruster <armbru@redhat.com>
[Fix compilation without the spice devel packages. - Paolo]
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
Change all machine_init() users that simply call type_register*()
to use type_init().
Cc: Evgeny Voevodin <e.voevodin@samsung.com>
Cc: Maksim Kozlov <m.kozlov@samsung.com>
Cc: Igor Mitsyanko <i.mitsyanko@gmail.com>
Cc: Dmitry Solodkiy <d.solodkiy@samsung.com>
Cc: Peter Maydell <peter.maydell@linaro.org>
Cc: Rob Herring <robh@kernel.org>
Cc: Andrzej Zaborowski <balrogg@gmail.com>
Cc: Michael Walle <michael@walle.cc>
Cc: "Hervé Poussineau" <hpoussin@reactos.org>
Cc: Aurelien Jarno <aurelien@aurel32.net>
Cc: Leon Alrae <leon.alrae@imgtec.com>
Cc: Alexander Graf <agraf@suse.de>
Cc: David Gibson <david@gibson.dropbear.id.au>
Cc: Blue Swirl <blauwirbel@gmail.com>
Cc: Mark Cave-Ayland <mark.cave-ayland@ilande.co.uk>
Cc: Max Filippov <jcmvbkbc@gmail.com>
Cc: "Michael S. Tsirkin" <mst@redhat.com>
Acked-by: Marcel Apfelbaum <marcel@redhat.com>
Reviewed-by: Michael S. Tsirkin <mst@redhat.com>
Acked-by: David Gibson <david@gibson.dropbear.id.au>
Signed-off-by: Eduardo Habkost <ehabkost@redhat.com>
nvdimm work
sparse cpu id rework
ipmi enhancements
fixes all over the place
pxb option to tweak chassis number
Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
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Merge remote-tracking branch 'remotes/mst/tags/for_upstream' into staging
vhost, virtio, pci, pc, acpi
nvdimm work
sparse cpu id rework
ipmi enhancements
fixes all over the place
pxb option to tweak chassis number
Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
# gpg: Signature made Tue 15 Mar 2016 14:33:10 GMT using RSA key ID D28D5469
# gpg: Good signature from "Michael S. Tsirkin <mst@kernel.org>"
# gpg: aka "Michael S. Tsirkin <mst@redhat.com>"
* remotes/mst/tags/for_upstream: (51 commits)
hw/acpi: fix GSI links UID
ipmi: add some local variables in ipmi_sdr_init
ipmi: remove the need of an ending record in the SDR table
ipmi: use a function to initialize the SDR table
ipmi: add a realize function to the device class
ipmi: add rsp_buffer_set_error() helper
ipmi: remove IPMI_CHECK_RESERVATION() macro
ipmi: replace IPMI_ADD_RSP_DATA() macro with inline helpers
ipmi: remove IPMI_CHECK_CMD_LEN() macro
MAINTAINERS: machine core
MAINTAINERS: Add an entry for virtio header files
pc: acpi: clarify why possible LAPIC entries must be present in MADT
pc: acpi: drop cpu->found_cpus bitmap
pc: acpi: create Processor and Notify objects only for valid lapics
pc: acpi: create MADT.lapic entries only for valid lapics
pc: acpi: SRAT: create only valid processor lapic entries
pc: acpi: cleanup qdev_get_machine() calls
machine: introduce MachineClass.possible_cpu_arch_ids() hook
pc: init pcms->apic_id_limit once and use it throughout pc.c
pc: acpi: remove NOP assignment
...
Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
Let's use g_new0 to allocate cpu_states.
Suggested-by: Thomas Huth <thuth@redhat.com>
Reviewed-by: Thomas Huth <thuth@redhat.com>
Signed-off-by: Cornelia Huck <cornelia.huck@de.ibm.com>
As we now have the new machine definitions, that let us disable/enable
machine options more easily, we need a way to save them and make them
publicly available.
The new s390-virtio-ccw.h header exports the s390 ccw machine state
and class, so they can be easily used in other C files.
Signed-off-by: Janosch Frank <frankja@linux.vnet.ibm.com>
Acked-by: Cornelia Huck <cornelia.huck@de.ibm.com>
Signed-off-by: Cornelia Huck <cornelia.huck@de.ibm.com>
Most of the machine definition code looks the same between different
machine versions. The new DEFINE_CCW_MACHINE macro makes defining a
new machine easier by inserting standard machine version
definitions. This also makes it possible to propagate values between
machine versions.
The patch is inspired by code from hw/ppc/spapr.c
Signed-off-by: Janosch Frank <frankja@linux.vnet.ibm.com>
Reviewed-by: Cornelia Huck <cornelia.huck@de.ibm.com>
Signed-off-by: Cornelia Huck <cornelia.huck@de.ibm.com>
Implement cpu hotplug routine and add the machine hook.
Signed-off-by: Matthew Rosato <mjrosato@linux.vnet.ibm.com>
Reviewed-by: David Hildenbrand <dahi@linux.vnet.ibm.com>
Message-Id: <1457112875-5209-8-git-send-email-mjrosato@linux.vnet.ibm.com>
Signed-off-by: Cornelia Huck <cornelia.huck@de.ibm.com>
Check for and propogate errors during s390 cpu creation.
Signed-off-by: Matthew Rosato <mjrosato@linux.vnet.ibm.com>
Message-Id: <1457112875-5209-7-git-send-email-mjrosato@linux.vnet.ibm.com>
Reviewed-by: David Hildenbrand <dahi@linux.vnet.ibm.com>
Signed-off-by: Cornelia Huck <cornelia.huck@de.ibm.com>
Link each CPUState as property machine/cpu[n] during initialization.
Add a hotplug handler to s390-virtio-ccw machine and set the
state during plug.
Signed-off-by: Matthew Rosato <mjrosato@linux.vnet.ibm.com>
Reviewed-by: David Hildenbrand <dahi@linux.vnet.ibm.com>
Message-Id: <1457112875-5209-6-git-send-email-mjrosato@linux.vnet.ibm.com>
Signed-off-by: Cornelia Huck <cornelia.huck@de.ibm.com>
Once hotplug is enabled, interrupts may come in for CPUs
with an address > smp_cpus. Allocate for this and allow
search routines to look beyond smp_cpus.
Signed-off-by: Matthew Rosato <mjrosato@linux.vnet.ibm.com>
Message-Id: <1457112875-5209-5-git-send-email-mjrosato@linux.vnet.ibm.com>
Reviewed-by: David Hildenbrand <dahi@linux.vnet.ibm.com>
Signed-off-by: Cornelia Huck <cornelia.huck@de.ibm.com>
Both initial and hotplugged CPUs need to set the same initial
state.
Signed-off-by: Matthew Rosato <mjrosato@linux.vnet.ibm.com>
Reviewed-by: David Hildenbrand <dahi@linux.vnet.ibm.com>
Message-Id: <1457112875-5209-3-git-send-email-mjrosato@linux.vnet.ibm.com>
Signed-off-by: Cornelia Huck <cornelia.huck@de.ibm.com>
Ensure a valid cpu_model is set upfront by setting the
default value directly into the MachineState when none is
specified. This is needed to ensure hotplugged CPUs share
the same cpu_model.
Signed-off-by: Matthew Rosato <mjrosato@linux.vnet.ibm.com>
Reviewed-by: David Hildenbrand <dahi@linux.vnet.ibm.com>
Message-Id: <1457112875-5209-2-git-send-email-mjrosato@linux.vnet.ibm.com>
Signed-off-by: Cornelia Huck <cornelia.huck@de.ibm.com>
Some CPUs are of an opposite data-endianness to other components in the
system. Sometimes elfs have the data sections layed out with this CPU
data-endianness accounting for when loaded via the CPU, so byte swaps
(relative to other system components) will occur.
The leading example, is ARM's BE32 mode, which is is basically LE with
address manipulation on half-word and byte accesses to access the
hw/byte reversed address. This means that word data is invariant
across LE and BE32. This also means that instructions are still LE.
The expectation is that the elf will be loaded via the CPU in this
endianness scheme, which means the data in the elf is reversed at
compile time.
As QEMU loads via the system memory directly, rather than the CPU, we
need a mechanism to reverse elf data endianness to implement this
possibility.
Reviewed-by: Peter Maydell <peter.maydell@linaro.org>
Signed-off-by: Peter Crosthwaite <crosthwaite.peter@gmail.com>
Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
We must not allow a channel program to suspend if the suspend
control bit in the orb had not been specified.
Reviewed-by: Halil Pasic <pasic@linux.vnet.ibm.com>
Signed-off-by: Cornelia Huck <cornelia.huck@de.ibm.com>
Even PCI_CAP_FLAGS has the same value as PCI_MSIX_FLAGS, the later one is
the more proper on retrieving MSIX entries.
This patch uses PCI_MSIX_FLAGS to retrieve the MSIX entries.
Signed-off-by: Wei Yang <richard.weiyang@gmail.com>
CC: Cornelia Huck <cornelia.huck@de.ibm.com>
CC: Christian Borntraeger <borntraeger@de.ibm.com>
Message-Id: <1455895091-7589-3-git-send-email-richard.weiyang@gmail.com>
Signed-off-by: Cornelia Huck <cornelia.huck@de.ibm.com>
machine_init() will be gone, but we don't need it if we just
initialize the channel_subsys fields statically.
Cc: Cornelia Huck <cornelia.huck@de.ibm.com>
Cc: Christian Borntraeger <borntraeger@de.ibm.com>
Cc: Richard Henderson <rth@twiddle.net>
Cc: Alexander Graf <agraf@suse.de>
Signed-off-by: Eduardo Habkost <ehabkost@redhat.com>
Message-Id: <1455656347-29033-4-git-send-email-ehabkost@redhat.com>
Reviewed-by: Cornelia Huck <cornelia.huck@de.ibm.com>
[adapted on top of indicator changes]
Signed-off-by: Cornelia Huck <cornelia.huck@de.ibm.com>
There's no need to use g_malloc0() to allocate the channel_subsys
struct, just use a static variable.
Cc: Cornelia Huck <cornelia.huck@de.ibm.com>
Cc: Christian Borntraeger <borntraeger@de.ibm.com>
Cc: Richard Henderson <rth@twiddle.net>
Cc: Alexander Graf <agraf@suse.de>
Signed-off-by: Eduardo Habkost <ehabkost@redhat.com>
Message-Id: <1455656347-29033-3-git-send-email-ehabkost@redhat.com>
Reviewed-by: Cornelia Huck <cornelia.huck@de.ibm.com>
[adapted on top of indicator changes]
Signed-off-by: Cornelia Huck <cornelia.huck@de.ibm.com>
Indicator refcounting interfaces are introduced. This patch fixes
introducing unneeded indicator mappings and failure to release
AISB mappings on deregistration.
Signed-off-by: Yi Min Zhao <zyimin@linux.vnet.ibm.com>
Reviewed-by: Cornelia Huck <cornelia.huck@de.ibm.com>
Signed-off-by: Cornelia Huck <cornelia.huck@de.ibm.com>
Currently, virtio-ccw uses its own interfaces to keep indicators mapped
just once even if the same address has been registered multiple times.
These interfaces fit the PCI use case as well. Therefore, move them to
css and make them generic interfaces.
Signed-off-by: Yi Min Zhao <zyimin@linux.vnet.ibm.com>
Reviewed-by: Cornelia Huck <cornelia.huck@de.ibm.com>
Signed-off-by: Cornelia Huck <cornelia.huck@de.ibm.com>
This is an s390 boot rom which was used in s390-virtio machine.
but since commit 3538fb6f89
"s390x: remove s390-virtio machine", this file isn't used.
The only place it is referenced in the code is an unused
define ZIPL_FILENAME. There's also comment in hw/s390/ipl.c
which I'm modifying too, to refer to s390-ccw.img instead.
Signed-off-by: Michael Tokarev <mjt@tls.msk.ru>
Acked-by: Christian Borntraeger <borntraeger@de.ibm.com>
Acked-by: Cornelia Huck <cornelia.huck@de.ibm.com>
Clean up includes so that osdep.h is included first and headers
which it implies are not included manually.
This commit was created with scripts/clean-includes.
Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
Acked-by: Cornelia Huck <cornelia.huck@de.ibm.com>
Message-id: 1453832250-766-8-git-send-email-peter.maydell@linaro.org
From the beginning, css support contained an error in csch handling:
instead of setting the clear bit in the function control bits twice, we
need to set the clear pending bit in the activity control bits. Let's
fix this.
Cc: qemu-stable@nongnu.org
Reviewed-by: Cornelia Huck <cornelia.huck@de.ibm.com>
Signed-off-by: Halil Pasic <pasic@linux.vnet.ibm.com>
Signed-off-by: Cornelia Huck <cornelia.huck@de.ibm.com>
Only one channel report word (crw) may be pending if there is
event-information pending.
This patch introduces a bool-type field 'sei_pending' for the
channel subsystem, which indicates whether there are pending events.
It is set when event information is made pending and the crw
generated, and cleared after the guest has collected all pending
event information. A crw is not generated if this flag had already
been set.
Signed-off-by: Song Shan Gong <gongss@linux.vnet.ibm.com>
Reviewed-by: Cornelia Huck <cornelia.huck@de.ibm.com>
Signed-off-by: Cornelia Huck <cornelia.huck@de.ibm.com>
The init of a device should have no side effects. Therefore move
registering of the event facility into the realize function, so
multiple instances of the SCLP device can be created e.g. for
introspection.
Add some more detail as to why we have to add it to the sysbus
at all.
Suggested-by: Paolo Bonzini <pbonzini@redhat.com>
Signed-off-by: David Hildenbrand <dahi@linux.vnet.ibm.com>
Signed-off-by: Cornelia Huck <cornelia.huck@de.ibm.com>
fix a typo that messes up instance and class size.
Signed-off-by: Christian Borntraeger <borntraeger@de.ibm.com>
Reviewed-by: David Hildenbrand <dahi@linux.vnet.ibm.com>
Signed-off-by: Cornelia Huck <cornelia.huck@de.ibm.com>
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-----END PGP SIGNATURE-----
Merge remote-tracking branch 'remotes/armbru/tags/pull-error-2016-01-13' into staging
Error reporting patches for 2016-01-13
# gpg: Signature made Wed 13 Jan 2016 14:21:48 GMT using RSA key ID EB918653
# gpg: Good signature from "Markus Armbruster <armbru@redhat.com>"
# gpg: aka "Markus Armbruster <armbru@pond.sub.org>"
* remotes/armbru/tags/pull-error-2016-01-13: (41 commits)
checkpatch: Detect newlines in error_report and other error functions
error: Consistently name Error * objects err, and not errp
s390/sclp: Simplify control flow in sclp_realize()
hw/s390x: Rename local variables Error *l_err to just err
error: Clean up errors with embedded newlines (again)
vhdx: Fix "log that needs to be replayed" error message
pci-assign: Clean up "Failed to assign" error messages
vmdk: Clean up "Invalid extent lines" error message
vmdk: Clean up control flow in vmdk_parse_extents() a bit
error: Strip trailing '\n' from error string arguments (again)
qemu-io qemu-nbd: Use error_report() etc. instead of fprintf()
migration: Use error_reportf_err() instead of monitor_printf()
spapr: Use error_reportf_err()
error: Use error_prepend() where it makes obvious sense
error: Use error_reportf_err() where it makes obvious sense
error: Don't decorate original error message when adding to it
error: New error_prepend(), error_reportf_err()
test-throttle: Simplify qemu_init_main_loop() error handling
qemu-nbd: Clean up "Failed to load snapshot" error message
block: Clean up "Could not create temporary overlay" error message
...
Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
