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From: Christian Borntraeger <borntraeger@de.ibm.com>
To: "Gonglei (Arei)" <arei.gonglei@huawei.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>,
	"davem@davemloft.net" <davem@davemloft.net>,
	"herbert@gondor.apana.org.au" <herbert@gondor.apana.org.au>
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>,
	"Wubin (H)" <wu.wubin@huawei.com>
Subject: Re: [PATCH v8 1/1] crypto: add virtio-crypto driver
Date: Thu, 12 Jan 2017 15:10:25 +0100	[thread overview]
Message-ID: <a8384ff8-ff65-c578-c338-e6d8ebf498c4@de.ibm.com> (raw)
In-Reply-To: <c4282723-2afb-1764-2431-ef41f7126371@de.ibm.com>

On 01/10/2017 01:56 PM, Christian Borntraeger wrote:
> On 01/10/2017 01:36 PM, Gonglei (Arei) wrote:
>> 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.
> 
> Yes, but the aesni driver will only bind if there is HW support in the guest.
> And if aesni is available in the guest (or the s390 aes function from cpacf)
> it will always be faster than the same in the host via virtio.So your priority
> should be smaller.


any opinion on this? 

  reply	other threads:[~2017-01-12 14:10 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)
2017-01-10 12:56       ` Christian Borntraeger
2017-01-12 14:10         ` Christian Borntraeger [this message]
2017-01-12 14:23           ` Michael S. Tsirkin
2017-01-13  1:56             ` Gonglei (Arei)

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