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

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Date:   Wed, 9 Jan 2019 13:31:27 -0500
From:   "Michael S. Tsirkin" <mst@...hat.com>
To:     Christian Borntraeger <borntraeger@...ibm.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 Wed, Jan 09, 2019 at 07:22:50PM +0100, Christian Borntraeger wrote:
> 
> 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?

Yes. It works because I rebase my tree.

-- 
MST