Re: [Xen-devel] [Qemu-devel] [PATCH 4/5] pci: Add INTERFACE_LEGACY_PCI_DEVICE to legacy PCI devices

[Eduardo Habkost <ehabkost@xxxxxxxxxx>]

On Mon, Aug 28, 2017 at 06:58:37PM -0400, John Snow wrote:
> 
> 
> On 08/25/2017 03:39 PM, Eduardo Habkost wrote:
> > CCing maintainers of affected devices (sorry for not CCing you
> > before).
> > 
> > On Wed, Aug 23, 2017 at 07:14:44PM -0300, Eduardo Habkost wrote:
> >> Add INTERFACE_LEGACY_PCI_DEVICE to all direct subtypes of
> >> TYPE_PCI_DEVICE, except:
> >>
> >> 1) The ones that already have INTERFACE_PCIE_DEVICE set:
> >>
> >> * base-xhci
> >> * e1000e
> >> * nvme
> >> * pvscsi
> >> * vfio-pci
> >> * virtio-pci
> >> * vmxnet3
> >>
> >> 2) base-pci-bridge
> >>
> >> Not all PCI bridges are legacy PCI devices, so
> >> INTERFACE_LEGACY_PCI_DEVICE is added only to the subtypes that
> >> are actually legacy PCI devices:
> >>
> >> * dec-21154-p2p-bridge
> >> * i82801b11-bridge
> >> * pbm-bridge
> >> * pci-bridge
> >>
> >> The direct subtypes of base-pci-bridge not touched by this patch
> >> are:
> >>
> >> * xilinx-pcie-root: Already marked as PCIe-only device.
> >> * pcie-port: all non-abstract subtypes of pcie-port are already
> >>   marked as PCIe-only devices.
> >>
> >> 3) megasas-base
> >>
> >> Not all megasas devices are legacy PCI devices, so the interface
> >> names are added to the subclasses registered by
> >> megasas_register_types(), according to information in the
> >> megasas_devices[] array.
> >>
> >> "megasas-gen2" already implements INTERFACE_PCIE_DEVICE, so add
> >> INTERFACE_LEGACY_PCI_DEVICE only to "megasas".
> >>
> >> Signed-off-by: Eduardo Habkost <ehabkost@xxxxxxxxxx>
> >> ---
> 
> [...]
> 
> >>  hw/ide/ich.c                        |  4 ++++
> >>  hw/ide/pci.c                        |  4 ++++
> 
> Acked-by: John Snow <jsnow@xxxxxxxxxx>
> 
> 
> (Random fly-by comment without looking at the other patches: I assume
> there are reasons it's not appropriate or good to add a legacy PCI
> device parent that we inherit from, and it's instead better to manually
> add the property to all children?)

Yes, the reason I'm using interfaces instead of regular
inheritance is the existence of hybrid devices (see patch 2/5).

-- 
Eduardo

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