Re: Odd square bracket encoding in QOM names

["Michal Prívozník" <mprivozn@redhat.com>]

On 11/30/21 09:35, Mark Cave-Ayland wrote:
> Hi all,
> 
> Has there been a recent change as to how square brackets are encoded
> within QOM names? I noticed that the output has changed here in the
> "info qom-tree" output in qemu-system-m68k for the q800 machine.
> 
> The q800 machine has a set of 256 memory region aliases that used to
> appear in the "info qom-tree" output as:
> 
>     /mac_m68k.io[100] (memory-region)
>     /mac_m68k.io[101] (memory-region)
>     /mac_m68k.io[102] (memory-region)
> 
> but they now appear as:
> 
>     /mac_m68k.io\x5b100\x5d[0] (memory-region)
>     /mac_m68k.io\x5b101\x5d[0] (memory-region)
>     /mac_m68k.io\x5b102\x5d[0] (memory-region)
> 
> Is there something that could cause the names to be double-encoded
> before being displayed?

I see the same behavior on x86_64 and qemu-system-x86_64 but with a
different member:

/machine (pc-i440fx-4.0-machine)
  /device-memory[0] (memory-region)
  /fw_cfg (fw_cfg_io)
    /\x2from@etc\x2facpi\x2frsdp[0] (memory-region)
    /\x2from@etc\x2facpi\x2ftables[0] (memory-region)
    /\x2from@etc\x2ftable-loader[0] (memory-region)

And the same happens over QMP too:

virsh qemu-monitor-command $dom qom-list '"path":"/machine/fw_cfg"'

{"return":[{"name":"type","type":"string"},{"name":"parent_bus","type":"link<bus>"},{"name":"realized","type":"bool"},{"name":"hotplugged","type":"bool"},{"name":"hotpluggable","type":"bool"},{"name":"acpi-mr-restore","type":"bool"},{"name":"x-file-slots","type":"uint16"},{"name":"dma_enabled","type":"bool"},{"name":"\\x2from@etc\\x2facpi\\x2ftables[0]","type":"child<memory-region>"},{"name":"fwcfg.dma[0]","type":"child<memory-region>"},{"name":"fwcfg[0]","type":"child<memory-region>"},{"name":"\\x2from@etc\\x2facpi\\x2frsdp[0]","type":"child<memory-region>"},{"name":"\\x2from@etc\\x2ftable-loader[0]","type":"child<memory-region>"}],"id":"libvirt-455"}

Michal