Re: [Qemu-devel] No more chameleon devices

[Marcel Apfelbaum <marcel.apfelbaum@gmail.com>]

On 10/18/18 5:48 PM, Peter Maydell wrote:
> On 18 October 2018 at 15:45, Marcel Apfelbaum
> <marcel.apfelbaum@gmail.com> wrote:
>> PCIe machines support PCI devices while PCI machines do not support
>> PCIe devices.
>>
>> I think users of the PCI machines would benefit from having a clear list of
>> supported devices, rather than have to find out if their device
>>   1. Is a hybrid device - QEMU will 'make' it PCI/PCIe
>>   2. Is a PCIe device - would not work on a PCI machine
>>   3. Is a PCI device - all good
> Ah, I see. So, today, of all the devices labelled as "pci" which
> QEMU has, how many of them are in which of those categories?
> (I guess I'm mostly interested in whether what we have is
> mostly really-PCI devices with one or two PCIe devices, or
> if we're currently (mis-)modelling some PCIe devices as hybrid.)

Eduardo added 'marker' interfaces to all PCI/PCIe devices
making it easier to answer the question.

A 'hybrid' devices implements both:
    * INTERFACE_CONVENTIONAL_PCI_DEVICE
    * INTERFACE_PCIE_DEVICE
interfaces, please see the complete list:
     https://paste.fedoraproject.org/paste/vgOo7n7PKi3Wxij~5dZxQQ

The list is not complete as we cannot see devices of derived classes,
like virtio-*-pci, but is good enough.


Thanks,
Marcel

> thanks
> -- PMM