linux-kernel - Re: [PATCH v3 0/3] virtio-balloon: tweak config

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Date:   Mon, 7 Jan 2019 14:40:23 +0100
From:   Christian Borntraeger <borntraeger@...ibm.com>
To:     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,
        mst@...hat.com, cohuck@...hat.com
Cc:     pbonzini@...hat.com, dgilbert@...hat.com, pasic@...ux.ibm.com
Subject: Re: [PATCH v3 0/3] virtio-balloon: tweak config_changed

Can you please cc stable? Right now 4.20 does not work under KVM.



On 07.01.2019 08:01, Wei Wang wrote:
> Since virtio-ccw doesn't work with accessing to the config space
> inside an interrupt context, this patch series avoids that issue by
> moving the config register accesses to the related workqueue contexts.
> 
> v2->v3 ChangeLog:
>     - rename cmd_id_received to cmd_id_received_cache, and have call sites
>       read the latest value via virtio_balloon_cmd_id_received. (Still
>       kept Cornelia and Halil's reviewed-by as it's a minor change)
>     - remove zeroing vb->num_free_page_blocks in probe since vb is
>       allocated via kzalloc.
> v1->v2 ChangeLog:
>     - add config_read_bitmap to indicate to the workqueue callbacks about
>       the necessity of reading the related config fields.
> 
> Wei Wang (3):
>   virtio-balloon: tweak config_changed implementation
>   virtio-balloon: improve update_balloon_size_func
>   virtio_balloon: remove the unnecessary 0-initialization
> 
>  drivers/virtio/virtio_balloon.c | 104 ++++++++++++++++++++++++++--------------
>  1 file changed, 69 insertions(+), 35 deletions(-)
>