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qdev: Rework array properties based on list visitor
Until now, array properties are actually implemented with a hack that uses multiple properties on the QOM level: a static "foo-len" property and after it is set, dynamically created "foo[i]" properties. In external interfaces (-device on the command line and device_add in QMP), this interface was broken by commit f3558b1 ('qdev: Base object creation on QDict rather than QemuOpts') because QDicts are unordered and therefore it could happen that QEMU tried to set the indexed properties before setting the length, which fails and effectively makes array properties inaccessible. In particular, this affects the 'ports' property of the 'rocker' device, which used to be configured like this: -device rocker,len-ports=2,ports[0]=dev0,ports[1]=dev1 This patch reworks the external interface so that instead of using a separate top-level property for the length and for each element, we use a single true array property that accepts a list value. In the external interfaces, this is naturally expressed as a JSON list and makes array properties accessible again. The new syntax looks like this: -device '{"driver":"rocker","ports":["dev0","dev1"]}' Creating an array property on the command line without using JSON format is currently not possible. This could be fixed by switching from QemuOpts to a keyval parser, which however requires consideration of the compatibility implications. All internal users of devices with array properties go through qdev_prop_set_array() at this point, so updating it takes care of all of them. Resolves: https://gitlab.com/qemu-project/qemu/-/issues/1090 Fixes: f3558b1 Signed-off-by: Kevin Wolf <kwolf@redhat.com> Message-ID: <20231109174240.72376-12-kwolf@redhat.com> Signed-off-by: Kevin Wolf <kwolf@redhat.com>
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