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Subject: Re: [PATCH 5/6] vdpa: introduce virtio pci driver
To:     "Michael S. Tsirkin" <mst@redhat.com>
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From:   Jason Wang <jasowang@redhat.com>
Message-ID: <61117e6a-2568-d0f4-8713-d831af32814d@redhat.com>
Date:   Mon, 8 Jun 2020 18:07:36 +0800
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On 2020/6/8 下午5:54, Michael S. Tsirkin wrote:
> On Mon, Jun 08, 2020 at 05:46:52PM +0800, Jason Wang wrote:
>> On 2020/6/8 下午5:45, Michael S. Tsirkin wrote:
>>> On Mon, Jun 08, 2020 at 05:43:58PM +0800, Jason Wang wrote:
>>>>>> Looking at
>>>>>> pci_match_one_device() it checks both subvendor and subdevice there.
>>>>>>
>>>>>> Thanks
>>>>> But IIUC there is no guarantee that driver with a specific subvendor
>>>>> matches in presence of a generic one.
>>>>> So either IFC or virtio pci can win, whichever binds first.
>>>> I'm not sure I get there. But I try manually bind IFCVF to qemu's
>>>> virtio-net-pci, and it fails.
>>>>
>>>> Thanks
>>> Right but the reverse can happen: virtio-net can bind to IFCVF first.
>>
>> That's kind of expected. The PF is expected to be bound to virtio-pci to
>> create VF via sysfs.
>>
>> Thanks
>>
>>
>>
> Once VFs are created, don't we want IFCVF to bind rather than
> virtio-pci?


Yes, but for PF we need virtio-pci.

Thanks


>