[pci PATCH v5 3/4] ena: Migrate over to unmanaged SR-IOV support

[Don Dutile]

On 03/13/2018 11:04 AM, David Woodhouse wrote:
> On Tue, 2018-03-13 at 07:51 -0700, Alexander Duyck wrote:
> 
>> Actually the suggestion I had from Don Dutile was that we should be
>> looking at creating a pci-stub like driver specifically for those type
>> of devices, but without the ability to arbitrarily assign devices.
>> Basically we have to white-list it in one device at a time for those
>> kind of things.
> 
> It's still not clear what the point of that would be.
> 
A PF-stub to do device-assignment(-like) ops preserves the current security model,
and allows one to add pci-quirks at a device-level as well -- when the usual ACS
structs aren't properly added for a device, which happens quite frequently -- which
retains that common workaround as well.
Yet-another-method for VF assignment w/o even a simple PF driver stub
created multiple failure cases/configs when we were hashing the multiple options
a few weeks ago.
It's just simpler to implement a PF stub w/VF enablement ... b/c it's simple...

>> If you have the device ID of the thing you wanted to have work with
>> pci-stub before I could look at putting together a quick driver and
>> adding it to this set.
> 
> 1d0f:0053 would be an example.
>