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

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Message-ID: <20190109095048-mutt-send-email-mst@kernel.org>
Date:   Wed, 9 Jan 2019 09:52:07 -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 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.

-- 
MST