On Fri, Dec 04, 2015 at 12:55:07PM +0000, Peter Maydell wrote: > On 4 December 2015 at 12:50, Markus Armbruster <arm...@redhat.com> wrote: > > To finally answer your question: the proper owner of the property > > connecting the backend is the frontend half of the split device. So, if > > we have separate device models for controller and the block devices > > connected to it, the block backend property belongs to the latter, not > > the former. If we have separate device models for SD controller and > > card, the block backend property belongs to the card, not the > > controller. > > I thought this might be your answer, but this is problematic because > we now have a device in the tree (the sdhci pci card) which has the > property on the controller, and so that's now user-facing command > line ABI which we can't change...
If by ABI, you mean the command line format: -device sdhci-pci,drive=drive0 -drive id=drive0,if=sd,file=myimage then I don't see why that should change. As Paolo points out, there is only one card per controller. That's how real hardware does it as well. Cheers, -Kevin
