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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]
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This allows to receive mouse and keyboard events from
a Barrier server.
This is enabled by adding the following parameter on the
command line
... -object input-barrier,id=$id,name=$name ...
Where $name is the name declared in the screens section of barrier.conf
The barrier server (barriers) must be configured and must run on the
local host.
For instance:
section: screens
localhost:
...
VM-1:
...
end
section: links
localhost:
right = VM-1
VM-1:
left = localhost
end
Then on the QEMU command line:
... -object input-barrier,id=barrie0,name=VM-1 ...
When the mouse will move out of the screen of the local host on
the right, the mouse and the keyboard will be grabbed and all
related events will be send to the guest OS.
This is usefull when qemu is configured without emulated graphic card
but with a VFIO attached graphic card.
More information about Barrier can be found at:
https://github.com/debauchee/barrier
This avoids to install the Barrier server in the guest OS,
for instance when it is not supported or during the installation.
Signed-off-by: Laurent Vivier <laurent@vivier.eu>
Message-id: 20190906083812.29487-1-laurent@vivier.eu
Signed-off-by: Gerd Hoffmann <kraxel@redhat.com>
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