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

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Message-ID: <87k3q1faca.fsf@rustcorp.com.au>
Date:	Fri, 22 Feb 2013 11:12:13 +1030
From:	Rusty Russell <rusty@...tcorp.com.au>
To:	Ohad Ben-Cohen <ohad@...ery.com>
Cc:	Sjur Brændeland <sjur.brandeland@...ricsson.com>,
	"David S. Miller" <davem@...emloft.net>,
	Sjur Brændeland <sjur@...ndeland.net>,
	netdev@...r.kernel.org,
	virtualization <virtualization@...ts.linux-foundation.org>,
	"linux-kernel\@vger.kernel.org" <linux-kernel@...r.kernel.org>,
	Dmitry Tarnyagin <dmitry.tarnyagin@...ricsson.com>,
	Linus Walleij <linus.walleij@...aro.org>,
	Erwan Yvin <erwan.yvin@...ricsson.com>,
	Ido Yariv <ido@...ery.com>
Subject: Re: [PATCHv2 vringh 1/3] remoteproc: Add support for vringh (Host vrings)

Ohad Ben-Cohen <ohad@...ery.com> writes:
> On Thu, Feb 21, 2013 at 8:37 AM, Rusty Russell <rusty@...tcorp.com.au> wrote:
>> 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.
>
> Thanks.
>
> What do you think about creating some virtio-level wrappers for the
> vringh handlers?
>
> I don't think we're going to stop with caif as the only vringh user,
> and it could be nice if we follow the virtio spirit of decoupling the
> drivers from the low level implementation. It sure did prove itself
> when the remoteproc use cases started showing up, and it's neat.

The problem space is a bit different.  My immediate concern is getting
vhost (and thus vhost_net/blk) to use vringh: I wanted to unify the
in-userspace and in-kernelspace ring implementations.  We don't have
that issue in virtqueue.c.

vhost is (will be) the higher abstraction for in-userspace rings,
perhaps we want an equivalent for in-kernelspace rings.  I'm happy to
look at patches, but I don't immediately see what it would look like...

Thanks,
Rusty.
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