linux-kernel - Re: [PATCH 5/5] crypto: AES CBC multi-buffer glue code

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Message-ID: <2511888.9MT8h10EQL@tauon.atsec.com>
Date:	Thu, 29 Oct 2015 03:03:54 +0100
From:	Stephan Mueller <smueller@...onox.de>
To:	Tim Chen <tim.c.chen@...ux.intel.com>
Cc:	Herbert Xu <herbert@...dor.apana.org.au>,
	"H. Peter Anvin" <hpa@...or.com>,
	"David S.Miller" <davem@...emloft.net>,
	Chandramouli Narayanan <mouli_7982@...oo.com>,
	Vinodh Gopal <vinodh.gopal@...el.com>,
	James Guilford <james.guilford@...el.com>,
	Wajdi Feghali <wajdi.k.feghali@...el.com>,
	Jussi Kivilinna <jussi.kivilinna@....fi>,
	linux-crypto@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 5/5] crypto: AES CBC multi-buffer glue code

Am Mittwoch, 28. Oktober 2015, 14:19:29 schrieb Tim Chen:

Hi Tim,

>+
>+	/* check for dependent cpu features */
>+	if (!cpu_has_aes) {
>+		pr_err("aes_cbc_mb_mod_init: no aes support\n");
>+		err = -ENODEV;
>+		goto err1;
>+	}

In your post 0/5, you say that this mechanism needs AVX2. In the existing 
AESNI glue code I find

#ifdef CONFIG_X86_64
#ifdef CONFIG_AS_AVX2
        if (boot_cpu_has(X86_FEATURE_AVX2)) {

...

Why would that CPU check not be needed here?

Ciao
Stephan
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