Re: [PATCHv2 vringh 1/3] remoteproc: Add support for vringh (Host vrings)

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Ohad Ben-Cohen <ohad@xxxxxxxxxx> writes:
> Hi Sjur,
>
> On Tue, Feb 12, 2013 at 1:49 PM,  <sjur.brandeland@xxxxxxxxxxxxxx> wrote:
>> From: Sjur Brændeland <sjur.brandeland@xxxxxxxxxxxxxx>
>>
>> Add functions for creating, deleting and kicking host-side virtio rings.
>>
>> The host ring is not integrated with virtiqueues and cannot be managed
>> through virtio-config.
>
> Is that an inherent design/issue of vringh or just a description of
> the current vringh code ?

It's by design.  The producer (virtqueue) and consumer (vringh) are two
sides of the same coin, but they do different things.

virtqueue is a slightly higher level abstraction which assumes a
virtio_device, because every user so far has had one.  vringh doesn't,
because it's also aimed to underlie vhost.c which doesn't really have
one.

> This is possible of course thanks to the abstraction provided by
> virtio: remoteproc only implements a set of callbacks which virtio
> invokes when needed.
>
> Do we not want to follow a similar design scheme with vringh ?

Hmm... I clearly jumped the gun, assuming consensus was already reached.
I have put these patches *back* into pending-rebases, and they will not
be merged this merge window.

Cheers,
Rusty.
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