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

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Message-ID: <82063967A54EF84C8AFCD6BD7F6AD93310C14374@SHSMSX103.ccr.corp.intel.com>
Date:   Thu, 15 Dec 2016 00:59:19 +0000
From:   "Zeng, Xin" <xin.zeng@...el.com>
To:     "Gonglei (Arei)" <arei.gonglei@...wei.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>
CC:     "Huangweidong (C)" <weidong.huang@...wei.com>,
        Claudio Fontana <Claudio.Fontana@...wei.com>,
        "mst@...hat.com" <mst@...hat.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 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.

< Regards,
< -Gonglei