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From: Peter Maydell <peter.maydell@linaro.org>
Date: Thu, 13 Nov 2014 14:52:43 +0000
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Subject: Re: [Qemu-devel] [PATCH v3 1/1] virtio: serial: expose a
 'guest_writable' callback for users
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To: Gerd Hoffmann <kraxel@redhat.com>
Cc: Amit Shah <amit.shah@redhat.com>, =?UTF-8?B?TWFyYy1BbmRyw6kgTHVyZWF1?= <marcandre.lureau@redhat.com>, Amos Kong <akong@redhat.com>, qemu list <qemu-devel@nongnu.org>, Markus Armbruster <armbru@redhat.com>

On 13 November 2014 14:47, Gerd Hoffmann <kraxel@redhat.com> wrote:
> On Di, 2014-10-28 at 20:21 +0530, Amit Shah wrote:
>> Users of virtio-serial may want to know when a port becomes writable.  A
>> port can stop accepting writes if the guest port is open but not being
>> read from.  In this case, data gets queued up in the virtqueue, and
>> after the vq is full, writes to the port do not succeed.
>>
>> When the guest reads off a vq element, and adds a new one for the host
>> to put data in, we can tell users the port is available for more writes,
>> via the new ->guest_writable() callback.
>>
>> Signed-off-by: Amit Shah <amit.shah@redhat.com>
>
> What is the plan with that one?

It missed the hardfreeze deadline and is heading for 2.3 instead.

thanks
-- PMM