Linux Virtualization - May 2020 - [PATCH V2] ifcvf: move IRQ request/free to status change handlers

On 2020/5/13 ??12:42, Zhu, Lingshan wrote:
>
>
> On 5/13/2020 12:12 PM, Jason Wang wrote:
>>
>> On 2020/5/12 ??4:00, Zhu Lingshan wrote:
>>> This commit move IRQ request and free operations from probe()
>>> to VIRTIO status change handler to comply with VIRTIO spec.
>>>
>>> VIRTIO spec 1.1, section 2.1.2 Device Requirements: Device Status
Field
>>> The device MUST NOT consume buffers or send any used buffer
>>> notifications to the driver before DRIVER_OK.
>>
>>
>> This comment needs to be checked as I said previously. It's only 
>> needed if we're sure ifcvf can generate interrupt before DRIVER_OK.
>>
>>
>>>
>>> Signed-off-by: Zhu Lingshan <lingshan.zhu at intel.com>
>>> ---
>>> changes from V1:
>>> remove ifcvf_stop_datapath() in status == 0 handler, we don't
need
>>> to do this
>>> twice; handle status == 0 after DRIVER_OK -> !DRIVER_OK handler 
>>> (Jason Wang)
>>
>>
>> Patch looks good to me, but with this patch ping cannot work on my 
>> machine. (It works without this patch).
>>
>> Thanks
> This is strange, it works on my machines, let's have a check offline.
>
> Thanks,
> BR
> Zhu Lingshan

I give it a try with virito-vpda and a tiny userspace. Either works.

So it could be an issue of qemu codes.

Let's wait for Cindy to test if it really works.

Thanks