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From: "Gonglei (Arei)" <arei.gonglei@huawei.com>
To: Christian Borntraeger <borntraeger@de.ibm.com>,
	"linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>,
	"qemu-devel@nongnu.org" <qemu-devel@nongnu.org>,
	"virtio-dev@lists.oasis-open.org"
	<virtio-dev@lists.oasis-open.org>,
	"virtualization@lists.linux-foundation.org"
	<virtualization@lists.linux-foundation.org>,
	"linux-crypto@vger.kernel.org" <linux-crypto@vger.kernel.org>
Cc: "Huangweidong (C)" <weidong.huang@huawei.com>,
	Claudio Fontana <Claudio.Fontana@huawei.com>,
	"mst@redhat.com" <mst@redhat.com>,
	Luonengjun <luonengjun@huawei.com>,
	"Hanweidong (Randy)" <hanweidong@huawei.com>,
	"Xuquan (Quan Xu)" <xuquan8@huawei.com>,
	"Wanzongshun (Vincent)" <wanzongshun@huawei.com>,
	"stefanha@redhat.com" <stefanha@redhat.com>,
	"Zhoujian (jay, Euler)" <jianjay.zhou@huawei.com>,
	longpeng <longpeng2@huawei.com>,
	"arei.gonglei@hotmail.com" <arei.gonglei@hotmail.com>,
	"davem@davemloft.net" <davem@davemloft.net>,
	"Wubin (H)" <wu.wubin@huawei.com>,
	"herbert@gondor.apana.org.au" <herbert@gondor.apana.org.au>
Subject: RE: [PATCH v8 1/1] crypto: add virtio-crypto driver
Date: Tue, 10 Jan 2017 12:36:27 +0000	[thread overview]
Message-ID: <33183CC9F5247A488A2544077AF19020DA182B83@DGGEMA505-MBX.china.huawei.com> (raw)
In-Reply-To: <e235caf4-f51c-dccf-4eb7-548d3fa71644@de.ibm.com>

Hi,

> 
> On 12/15/2016 03:03 AM, Gonglei wrote:
> [...]
> > +
> > +static struct crypto_alg virtio_crypto_algs[] = { {
> > +	.cra_name = "cbc(aes)",
> > +	.cra_driver_name = "virtio_crypto_aes_cbc",
> > +	.cra_priority = 501,
> 
> 
> This is still higher than the hardware-accelerators (like intel aesni or the
> s390 cpacf functions or the arm hw). aesni and s390/cpacf are supported by the
> hardware virtualization and available to the guests. I do not see a way how
> virtio
> crypto can be faster than that (in the end it might be cpacf/aesni + overhead)
> instead it will very likely be slower.
> So we should use a number that is higher than software implementations but
> lower than the hw ones.
> 
> Just grepping around, the software ones seem be be around 100 and the
> hardware
> ones around 200-400. So why was 150 not enough?
> 
I didn't find a documentation about how we use the priority, and I assumed
people use virtio-crypto will configure hardware accelerators in the
host. So I choosed the number which bigger than aesni's priority.

Regards,
-Gonglei

  reply	other threads:[~2017-01-10 12:36 UTC|newest]

Thread overview: 8+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2016-12-15  2:03 [PATCH v8 0/1] virtio-crypto: add Linux driver Gonglei
2016-12-15  2:03 ` [PATCH v8 1/1] crypto: add virtio-crypto driver Gonglei
2017-01-10 12:27   ` Christian Borntraeger
2017-01-10 12:36     ` Gonglei (Arei) [this message]
2017-01-10 12:56       ` Christian Borntraeger
2017-01-12 14:10         ` Christian Borntraeger
2017-01-12 14:23           ` Michael S. Tsirkin
2017-01-13  1:56             ` Gonglei (Arei)

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