[Xen-devel] xen-pci-passthrough PCI Express support? (Re: [Qemu-devel] [PATCH v2 4/5] pci: Add INTERFACE_CONVENTIONAL_PCI_DEVICE to Conventional PCI devices)

["Jan Beulich" <JBeulich@xxxxxxxx>]

>>> On 03.10.17 at 02:12, <ehabkost@xxxxxxxxxx> wrote:
> On Thu, Sep 28, 2017 at 10:12:34AM -0300, Eduardo Habkost wrote:
>> On Thu, Sep 28, 2017 at 02:33:57AM -0600, Jan Beulich wrote:
>> > >>> On 27.09.17 at 21:56, <ehabkost@xxxxxxxxxx> wrote:
>> > > --- a/hw/xen/xen_pt.c
>> > > +++ b/hw/xen/xen_pt.c
>> > > @@ -964,6 +964,10 @@ static const TypeInfo xen_pci_passthrough_info = {
>> > >      .instance_size = sizeof(XenPCIPassthroughState),
>> > >      .instance_finalize = xen_pci_passthrough_finalize,
>> > >      .class_init = xen_pci_passthrough_class_init,
>> > > +    .interfaces = (InterfaceInfo[]) {
>> > > +        { INTERFACE_CONVENTIONAL_PCI_DEVICE },
>> > > +        { },
>> > > +    },
>> > >  };
>> > 
>> > Passed through devices can be both PCI and PCIe, so following
>> > the description of the patch I don't think these can be statically
>> > given either property. Granted quite a bit of PCIe specific
>> > functionality may be missing in the Xen code ...
>> 
>> This is just static data about what the device type supports, not
>> about what a given device instance really is.  Deciding if the
>> device is PCIe or Conventional at runtime is out of the scope of
>> this series.
>> 
>> That said, if passed through PCI Express devices are really
>> supported, it looks like this should be marked as hybrid.
> 
> Can anybody confirm if PCI Express devices are really supported
> by xen-pci-passthrough?

I think I've clearly said they're supported, with some limitations.

Jan


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