On Mon, May 21, 2012 at 10:36 AM, Peter Maydell <peter.mayd...@linaro.org> wrote: > On 21 May 2012 08:21, nicolas.sauzede <nicolas.sauz...@laposte.net> wrote: >> Ok, so I guess that for now, we have to live with the lack of a way to >> actually >> get those io transaction properties, right ? >> Do you think it would be feasible to allow it the future ? (for now, I've >> done >> some shortcuts and ugly hardcoding in my TLM prototype to make things work, >> but still..) >> >> In fact, we encounter the same kind of issues regarding the "debug" property >> when doing >> io transaction. > >> Do you think this feature could be useful/legitimate in upstream qemu ? > > I think it would be nice to have this in upstream qemu; however adding > transaction properties to the IO interface would be quite tricky I > suspect...
This is limited to CPU and CPU local bus devices (not generic like PCI), so there could be an out of band mechanism to get/set the additional data. For example store in op_helper.c could use cpu_set_amba_properties(...) before the store and afterwards cpu_get_amba_reply(...). An AMBA device could do the counterpart with device_get_amba_properties() and device_set_amba_reply(). A generic device (like NE2k) would not care about the properties or replies. > > -- PMM
