Re: [PATCH v8 1/1] crypto: add virtio-crypto driver

From	Christian Borntraeger <borntraeger@de.ibm.com>
Newsgroups	linux.kernel
Subject	Re: [PATCH v8 1/1] crypto: add virtio-crypto driver
Date	2017-01-10 13:30 +0100
Message-ID	<sY3IS-1gX-7@gated-at.bofh.it> (permalink)
References	<sOtEB-8g3-1@gated-at.bofh.it> <sOtOi-8jg-13@gated-at.bofh.it>
Organization	linux.* mail to news gateway

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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?

Christian

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Re: [PATCH v8 1/1] crypto: add virtio-crypto driver Christian Borntraeger <borntraeger@de.ibm.com> - 2017-01-10 13:30 +0100
  RE: [PATCH v8 1/1] crypto: add virtio-crypto driver "Gonglei (Arei)" <arei.gonglei@huawei.com> - 2017-01-10 13:40 +0100
    Re: [PATCH v8 1/1] crypto: add virtio-crypto driver Christian Borntraeger <borntraeger@de.ibm.com> - 2017-01-10 14:00 +0100
      Re: [PATCH v8 1/1] crypto: add virtio-crypto driver Christian Borntraeger <borntraeger@de.ibm.com> - 2017-01-12 15:20 +0100
        Re: [PATCH v8 1/1] crypto: add virtio-crypto driver "Michael S. Tsirkin" <mst@redhat.com> - 2017-01-12 15:30 +0100
          RE: [PATCH v8 1/1] crypto: add virtio-crypto driver "Gonglei (Arei)" <arei.gonglei@huawei.com> - 2017-01-13 03:00 +0100

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