linux-kernel - Re: [PATCH v3 1/3] virtio-balloon: tweak config

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Date:   Wed, 9 Jan 2019 19:22:50 +0100
From:   Christian Borntraeger <borntraeger@...ibm.com>
To:     "Michael S. Tsirkin" <mst@...hat.com>
Cc:     Wei Wang <wei.w.wang@...el.com>, virtio-dev@...ts.oasis-open.org,
        linux-kernel@...r.kernel.org,
        virtualization@...ts.linux-foundation.org, kvm@...r.kernel.org,
        cohuck@...hat.com, pbonzini@...hat.com, dgilbert@...hat.com,
        pasic@...ux.ibm.com
Subject: Re: [PATCH v3 1/3] virtio-balloon: tweak config_changed
 implementation


On 09.01.2019 15:52, Michael S. Tsirkin wrote:
> On Wed, Jan 09, 2019 at 01:07:16PM +0100, Christian Borntraeger wrote:
>> On 09.01.2019 11:35, Wei Wang wrote:
>>> On 01/08/2019 04:46 PM, Christian Borntraeger wrote:
>>>>
>>>> On 08.01.2019 06:35, Wei Wang wrote:
>>>>> On 01/07/2019 09:49 PM, Christian Borntraeger wrote:
>>>>>> On 07.01.2019 08:01, Wei Wang wrote:
>>>>>>> virtio-ccw has deadlock issues with reading the config space inside the
>>>>>>> interrupt context, so we tweak the virtballoon_changed implementation
>>>>>>> by moving the config read operations into the related workqueue contexts.
>>>>>>> The config_read_bitmap is used as a flag to the workqueue callbacks
>>>>>>> about the related config fields that need to be read.
>>>>>>>
>>>>>>> The cmd_id_received is also renamed to cmd_id_received_cache, and
>>>>>>> the value should be obtained via virtio_balloon_cmd_id_received.
>>>>>>>
>>>>>>> Reported-by: Christian Borntraeger <borntraeger@...ibm.com>
>>>>>>> Signed-off-by: Wei Wang <wei.w.wang@...el.com>
>>>>>>> Reviewed-by: Cornelia Huck <cohuck@...hat.com>
>>>>>>> Reviewed-by: Halil Pasic <pasic@...ux.ibm.com>
>>>>>> Together with
>>>>>>     virtio_pci: use queue idx instead of array idx to set up the vq
>>>>>>     virtio: don't allocate vqs when names[i] = NULL
>>>>>>
>>>>>> Tested-by: Christian Borntraeger <borntraeger@...ibm.com>
>>>>> OK. I don't plan to send a new version of the above patches as no changes needed so far.
>>>>>
>>>>> Michael, if the above two patches look good to you, please help add the related tested-by
>>>>> and reviewed-by tags. Thanks.
>>>> Can we also make sure that
>>>>
>>>> virtio_pci: use queue idx instead of array idx to set up the vq
>>>> virtio: don't allocate vqs when names[i] = NULL
>>>>
>>>> also land in stable?
>>>>
>>>
>>> You could also send the request to stable after it gets merged to Linus' tree.
>>> The stable review committee will decide whether to take it.
>>>
>>> Please see Option 2:
>>>
>>> https://www.kernel.org/doc/html/latest/process/stable-kernel-rules.html
>>>
>>
>> Those patches are not upstream yet, Correct?
>>
>> Michael,
>>
>> can you add the stable tag before submitting? If not, can you give me a heads up when doing the
>> pull request so that I can ping the stable folks.
> 
> Can you reply to patches that you feel are needed on stable with just
> 
> Cc: stable@...r.kernel.org
> 
> in the message body?
> 
> Then it's all automatically handled by ack attaching scripts.

Done. But this only works if those patches are not already part of a tree. I guess they have to go via
your tree, correct?