linux-kernel - Re: [virtio-dev] [PATCH v2 1/2] virtio-balloon: tweak config

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Message-Id: <20190104122626.1bdf019c@oc2783563651>
Date:   Fri, 4 Jan 2019 12:26:26 +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: [virtio-dev] [PATCH v2 1/2] virtio-balloon: tweak
 config_changed implementation

On Fri,  4 Jan 2019 15:11:52 +0800
Wei Wang <wei.w.wang@...el.com> 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.
> 
> Reported-by: Christian Borntraeger <borntraeger@...ibm.com>
> Signed-off-by: Wei Wang <wei.w.wang@...el.com>

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