Re: [Qemu-devel] KVM call agenfda for 2014-04-01

[Alexander Graf]

On 10.04.2014, at 17:52, Peter Maydell <address@hidden> wrote:

> On 10 April 2014 16:49, Alexander Graf <address@hidden> wrote:
>> For the next call, I would propose to revive the "platform bus"
>> (aka: how to create non-PCI devices with -device) discussions
>> to make sure we're all on the same page.
> 
> I rather suspect we are not :-)  Do you have a link to
> the current proposals for prior reading?

The only thing I could find is the old thread about my platform bus approach 
(which Anthony disliked):

  https://lists.gnu.org/archive/html/qemu-devel/2013-07/msg03614.html

So from what I remember the plan moving forward was to have a special device 
type similar to my platform bus devices that you can just create using -device, 
no bus involved. The machine file would then loop through them, interpret the 
"I sit at address x" and "I want interrupt number y" fields to link them to 
whatever the machine model thinks is a good fit.

The same way the machine model today has to have knowledge on each device tree 
node type it generates, it would do the same for these devices. So the machine 
has to have awareness of all the "funky special options" a device tree node 
receives - the same as for any other device. Just that in this case it wouldn't 
be able to hardcode them, but have to generate them on the fly when it sees a 
device in the object tree.


Alex