linux-kernel - Re: [PATCH v1 1/2] virtio-balloon: tweak config

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Message-Id: <20190103131628.3674a50d@oc2783563651>
Date:   Thu, 3 Jan 2019 13:16:28 +0100
From:   Halil Pasic <pasic@...ux.ibm.com>
To:     Wei Wang <wei.w.wang@...el.com>
Cc:     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, borntraeger@...ibm.com,
        pbonzini@...hat.com, dgilbert@...hat.com
Subject: Re: [PATCH v1 1/2] virtio-balloon: tweak config_changed
 implementation

On Thu,  3 Jan 2019 13:31:01 +0800
Wei Wang <wei.w.wang@...el.com> wrote:

> virtio-ccw has deadlock issues with reading config registers inside the
> interrupt context

I would say something like 'virtio-ccw does not support using
virtio_config_ops from an atomic context' as the limitation is not
limited to read config (aka. get()). But I'm fine with your formulation
as well.

> , so we tweak the virtballoon_changed implementation
> by moving the config read operations into the related workqueue contexts.
> 
> Signed-off-by: Wei Wang <wei.w.wang@...el.com>


Reviewed-by: Halil Pasic <pasic@...ux.ibm.com>

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