linux-kernel - Re: [Qemu-devel] [PATCH v7 1/1] crypto: add virtio-crypto driver

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Date:   Thu, 15 Dec 2016 18:42:31 +0200
From:   "Michael S. Tsirkin" <mst@...hat.com>
To:     "Gonglei (Arei)" <arei.gonglei@...wei.com>
Cc:     "Zeng, Xin" <xin.zeng@...el.com>,
        Halil Pasic <pasic@...ux.vnet.ibm.com>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "qemu-devel@...gnu.org" <qemu-devel@...gnu.org>,
        "virtio-dev@...ts.oasis-open.org" <virtio-dev@...ts.oasis-open.org>,
        "virtualization@...ts.linux-foundation.org" 
        <virtualization@...ts.linux-foundation.org>,
        "linux-crypto@...r.kernel.org" <linux-crypto@...r.kernel.org>,
        "Huangweidong (C)" <weidong.huang@...wei.com>,
        Claudio Fontana <Claudio.Fontana@...wei.com>,
        Luonengjun <luonengjun@...wei.com>,
        "Hanweidong (Randy)" <hanweidong@...wei.com>,
        "Xuquan (Quan Xu)" <xuquan8@...wei.com>,
        "Wanzongshun (Vincent)" <wanzongshun@...wei.com>,
        "stefanha@...hat.com" <stefanha@...hat.com>,
        "Zhoujian (jay, Euler)" <jianjay.zhou@...wei.com>,
        "cornelia.huck@...ibm.com" <cornelia.huck@...ibm.com>,
        longpeng <longpeng2@...wei.com>,
        "arei.gonglei@...mail.com" <arei.gonglei@...mail.com>,
        "davem@...emloft.net" <davem@...emloft.net>,
        "Wubin (H)" <wu.wubin@...wei.com>,
        "herbert@...dor.apana.org.au" <herbert@...dor.apana.org.au>
Subject: Re: [Qemu-devel] [PATCH v7 1/1] crypto: add virtio-crypto driver

On Thu, Dec 15, 2016 at 01:08:51AM +0000, Gonglei (Arei) wrote:
> 
> 
> 
> 
> Regards,
> -Gonglei
> 
> 
> > -----Original Message-----
> > From: Zeng, Xin [mailto:xin.zeng@...el.com]
> > Sent: Thursday, December 15, 2016 8:59 AM
> > To: Gonglei (Arei); Halil Pasic; linux-kernel@...r.kernel.org;
> > qemu-devel@...gnu.org; virtio-dev@...ts.oasis-open.org;
> > virtualization@...ts.linux-foundation.org; linux-crypto@...r.kernel.org
> > Cc: Huangweidong (C); Claudio Fontana; mst@...hat.com; Luonengjun;
> > Hanweidong (Randy); Xuquan (Quan Xu); Wanzongshun (Vincent);
> > stefanha@...hat.com; Zhoujian (jay, Euler); cornelia.huck@...ibm.com;
> > longpeng; arei.gonglei@...mail.com; davem@...emloft.net; Wubin (H);
> > herbert@...dor.apana.org.au
> > Subject: RE: [Qemu-devel] [PATCH v7 1/1] crypto: add virtio-crypto driver
> > 
> > On Thursday, December 15, 2016 8:45 AM, Gonglei (Arei) Wrote:
> > < > > diff --git a/drivers/crypto/virtio/virtio_crypto_core.c
> > < > b/drivers/crypto/virtio/virtio_crypto_core.c
> > < > > new file mode 100644
> > < > > index 0000000..c0854a1
> > < > > --- /dev/null
> > < > > +++ b/drivers/crypto/virtio/virtio_crypto_core.c
> > < > > @@ -0,0 +1,474 @@
> > < > [..]
> > < > > +
> > < > > +static void virtcrypto_dataq_callback(struct virtqueue *vq)
> > < > > +{
> > < > > +	struct virtio_crypto *vcrypto = vq->vdev->priv;
> > < > > +	struct virtio_crypto_request *vc_req;
> > < > > +	unsigned long flags;
> > < > > +	unsigned int len;
> > < > > +	struct ablkcipher_request *ablk_req;
> > < > > +	int error;
> > < > > +
> > < > > +	spin_lock_irqsave(&vcrypto->lock, flags);
> > < >
> > < > Would it make sense to use a per virtqueue lock
> > < > like in virtio_blk for example instead of locking on the whole
> > < > device? OK, it seems you use only one dataqueue, so it
> > < > may not be that relevant.
> > < >
> > < Currently yes, both the backend device (cryptodev-backend-builtin)
> > < and the frontend driver use one dataqueue.
> > <
> > 
> > I think it makes sense to use per virtqueue lock here though it only uses one
> > queue so far,
> > but in the spec we already have multi queues support.
> > 
> Yes, I agree. Will do that in V8 soon. 
> Hope to catch up with Michael's pull request for 4.10.
> 
> Regards,
> -Gonglei

I merged v7, this change will have to wait. Sorry.