linux-kernel - Re: [PATCH v6 10/12] crypto: x86/aes - Prepare for a new AES implementation

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Message-ID: <20230511213948.GA838@quark.localdomain>
Date:   Thu, 11 May 2023 14:39:48 -0700
From:   Eric Biggers <ebiggers@...nel.org>
To:     "Chang S. Bae" <chang.seok.bae@...el.com>
Cc:     linux-kernel@...r.kernel.org, linux-crypto@...r.kernel.org,
        dm-devel@...hat.com, gmazyland@...il.com, luto@...nel.org,
        dave.hansen@...ux.intel.com, tglx@...utronix.de, bp@...en8.de,
        mingo@...nel.org, x86@...nel.org, herbert@...dor.apana.org.au,
        ardb@...nel.org, dan.j.williams@...el.com, bernie.keany@...el.com,
        charishma1.gairuboyina@...el.com,
        lalithambika.krishnakumar@...el.com,
        "David S. Miller" <davem@...emloft.net>,
        Ingo Molnar <mingo@...hat.com>,
        "H. Peter Anvin" <hpa@...or.com>
Subject: Re: [PATCH v6 10/12] crypto: x86/aes - Prepare for a new AES
 implementation

On Thu, May 11, 2023 at 12:05:17PM -0700, Chang S. Bae wrote:
> +
> +struct aes_xts_ctx {
> +	struct crypto_aes_ctx tweak_ctx AES_ALIGN_ATTR;
> +	struct crypto_aes_ctx crypt_ctx AES_ALIGN_ATTR;
> +};
> +
> +static inline struct crypto_aes_ctx *aes_ctx(void *raw_ctx)
> +{
> +	unsigned long addr = (unsigned long)raw_ctx;
> +	unsigned long align = AES_ALIGN;
> +
> +	if (align <= crypto_tfm_ctx_alignment())
> +		align = 1;
> +
> +	return (struct crypto_aes_ctx *)ALIGN(addr, align);
> +}

It seems you took my suggestion to fix the definition of struct aes_xts_ctx, but
you didn't make the corresponding change to the runtime alignment code.  There
should be a helper function aes_xts_ctx() that is used like:

    struct aes_xts_ctx *ctx = aes_xts_ctx(tfm);

It would do the runtime alignment.  Then, aes_ctx() should be removed.

- Eric