linux-kernel - Re: [PATCH v4 1/3] virtio-balloon: tweak config

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Date:   Tue, 8 Jan 2019 08:10:34 +0100
From:   Greg KH <gregkh@...uxfoundation.org>
To:     Wei Wang <wei.w.wang@...el.com>
Cc:     virtio-dev@...ts.oasis-open.org, linux-kernel@...r.kernel.org,
        stable@...r.kernel.org, virtualization@...ts.linux-foundation.org,
        kvm@...r.kernel.org, mst@...hat.com, cohuck@...hat.com,
        borntraeger@...ibm.com, pbonzini@...hat.com, dgilbert@...hat.com,
        pasic@...ux.ibm.com
Subject: Re: [PATCH v4 1/3] virtio-balloon: tweak config_changed
 implementation

On Tue, Jan 08, 2019 at 12:50:03PM +0800, 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.
> 
> Fixes: 86a559787e6f ("virtio-balloon: VIRTIO_BALLOON_F_FREE_PAGE_HINT")
> 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>
> Tested-by: Christian Borntraeger <borntraeger@...ibm.com>
> ---
>  drivers/virtio/virtio_balloon.c | 98 +++++++++++++++++++++++++++--------------
>  1 file changed, 65 insertions(+), 33 deletions(-)
> 

<formletter>

This is not the correct way to submit patches for inclusion in the
stable kernel tree.  Please read:
    https://www.kernel.org/doc/html/latest/process/stable-kernel-rules.html
for how to do this properly.

</formletter>