Hi,
dbg_print takes care of making it standard to have a loglevel and prefix, sounds good, but I'd still like to know if it is acceptable to also redirect with -debug, I guess reusing the DeviceState then, instead of my added struct, so just letting DeviceState.debug_chardev == NULL by default, and settable with -debug<devname>,id=<chardev_id>
Making dbg_print use DeviceState.debug_chardev (if present, stderr otherwise) looks sane to me. Buf I'd use standard properties then to set it instead of a separate -debug switch, i.e.
-chardev file,id=messages,path=... \ -device foo,dbg=1,dbglog=messages cheers, Gerd