Currently, the alignment of each field in struct aesni_xts_ctx occurs right before every access. However, it's possible to perform this alignment ahead of time. Introduce a helper function that converts struct crypto_skcipher *tfm to struct aesni_xts_ctx *ctx and returns an aligned address. Utilize this helper function at the beginning of each XTS function and then eliminate redundant alignment code. Suggested-by: Eric Biggers <ebiggers@xxxxxxxxxx> Link: https://lore.kernel.org/all/ZFWQ4sZEVu%2FLHq+Q@xxxxxxxxx/ Signed-off-by: Chang S. Bae <chang.seok.bae@xxxxxxxxx> Cc: linux-crypto@xxxxxxxxxxxxxxx Cc: x86@xxxxxxxxxx Cc: linux-kernel@xxxxxxxxxxxxxxx --- V1->V2: drop the cast (Eric). --- arch/x86/crypto/aesni-intel_glue.c | 23 ++++++++++++++--------- 1 file changed, 14 insertions(+), 9 deletions(-) diff --git a/arch/x86/crypto/aesni-intel_glue.c b/arch/x86/crypto/aesni-intel_glue.c index 80e28a01aa3a..b1d90c25975a 100644 --- a/arch/x86/crypto/aesni-intel_glue.c +++ b/arch/x86/crypto/aesni-intel_glue.c @@ -223,6 +223,11 @@ static inline struct crypto_aes_ctx *aes_ctx(void *raw_ctx) return aes_align_addr(raw_ctx); } +static inline struct aesni_xts_ctx *aes_xts_ctx(struct crypto_skcipher *tfm) +{ + return aes_align_addr(crypto_skcipher_ctx(tfm)); +} + static int aes_set_key_common(struct crypto_aes_ctx *ctx, const u8 *in_key, unsigned int key_len) { @@ -875,7 +880,7 @@ static int helper_rfc4106_decrypt(struct aead_request *req) static int xts_aesni_setkey(struct crypto_skcipher *tfm, const u8 *key, unsigned int keylen) { - struct aesni_xts_ctx *ctx = crypto_skcipher_ctx(tfm); + struct aesni_xts_ctx *ctx = aes_xts_ctx(tfm); int err; err = xts_verify_key(tfm, key, keylen); @@ -885,18 +890,18 @@ static int xts_aesni_setkey(struct crypto_skcipher *tfm, const u8 *key, keylen /= 2; /* first half of xts-key is for crypt */ - err = aes_set_key_common(aes_ctx(&ctx->crypt_ctx), key, keylen); + err = aes_set_key_common(&ctx->crypt_ctx, key, keylen); if (err) return err; /* second half of xts-key is for tweak */ - return aes_set_key_common(aes_ctx(&ctx->tweak_ctx), key + keylen, keylen); + return aes_set_key_common(&ctx->tweak_ctx, key + keylen, keylen); } static int xts_crypt(struct skcipher_request *req, bool encrypt) { struct crypto_skcipher *tfm = crypto_skcipher_reqtfm(req); - struct aesni_xts_ctx *ctx = crypto_skcipher_ctx(tfm); + struct aesni_xts_ctx *ctx = aes_xts_ctx(tfm); int tail = req->cryptlen % AES_BLOCK_SIZE; struct skcipher_request subreq; struct skcipher_walk walk; @@ -932,7 +937,7 @@ static int xts_crypt(struct skcipher_request *req, bool encrypt) kernel_fpu_begin(); /* calculate first value of T */ - aesni_enc(aes_ctx(&ctx->tweak_ctx), walk.iv, walk.iv); + aesni_enc(&ctx->tweak_ctx, walk.iv, walk.iv); while (walk.nbytes > 0) { int nbytes = walk.nbytes; @@ -941,11 +946,11 @@ static int xts_crypt(struct skcipher_request *req, bool encrypt) nbytes &= ~(AES_BLOCK_SIZE - 1); if (encrypt) - aesni_xts_encrypt(aes_ctx(&ctx->crypt_ctx), + aesni_xts_encrypt(&ctx->crypt_ctx, walk.dst.virt.addr, walk.src.virt.addr, nbytes, walk.iv); else - aesni_xts_decrypt(aes_ctx(&ctx->crypt_ctx), + aesni_xts_decrypt(&ctx->crypt_ctx, walk.dst.virt.addr, walk.src.virt.addr, nbytes, walk.iv); kernel_fpu_end(); @@ -973,11 +978,11 @@ static int xts_crypt(struct skcipher_request *req, bool encrypt) kernel_fpu_begin(); if (encrypt) - aesni_xts_encrypt(aes_ctx(&ctx->crypt_ctx), + aesni_xts_encrypt(&ctx->crypt_ctx, walk.dst.virt.addr, walk.src.virt.addr, walk.nbytes, walk.iv); else - aesni_xts_decrypt(aes_ctx(&ctx->crypt_ctx), + aesni_xts_decrypt(&ctx->crypt_ctx, walk.dst.virt.addr, walk.src.virt.addr, walk.nbytes, walk.iv); kernel_fpu_end(); -- 2.34.1
