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crypto/arm64: aes-gcm - Switch to 'ksimd' scoped guard API 

Switch to the more abstract 'scoped_ksimd()' API, which will be modified
in a future patch to transparently allocate a kernel mode FP/SIMD state
buffer on the stack, so that kernel mode FP/SIMD code remains
preemptible in principe, but without the memory overhead that adds 528
bytes to the size of struct task_struct.

Reviewed-by: Eric Biggers <ebiggers@kernel.org>
Reviewed-by: Jonathan Cameron <jonathan.cameron@huawei.com>
Acked-by: Catalin Marinas <catalin.marinas@arm.com>
Signed-off-by: Ard Biesheuvel <ardb@kernel.org>
This commit is contained in:
Ard Biesheuvel 2025-10-01 13:43:59 +02:00
parent ba3c1b3b5a
commit 87c9b04e71
1 changed files with 13 additions and 14 deletions
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27
arch/arm64/crypto/ghash-ce-glue.c
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@ -5,7 +5,6 @@
* Copyright (C) 2014 - 2018 Linaro Ltd. <ard.biesheuvel@linaro.org>
*/
#include <asm/neon.h>
#include <crypto/aes.h>
#include <crypto/b128ops.h>
#include <crypto/gcm.h>
@ -22,6 +21,8 @@
#include <linux/string.h>
#include <linux/unaligned.h>
#include <asm/simd.h>
MODULE_DESCRIPTION("GHASH and AES-GCM using ARMv8 Crypto Extensions");
MODULE_AUTHOR("Ard Biesheuvel <ard.biesheuvel@linaro.org>");
MODULE_LICENSE("GPL v2");
@ -74,9 +75,8 @@ void ghash_do_simd_update(int blocks, u64 dg[], const char *src,
u64 const h[][2],
const char *head))
{
kernel_neon_begin();
simd_update(blocks, dg, src, key->h, head);
kernel_neon_end();
scoped_ksimd()
simd_update(blocks, dg, src, key->h, head);
}
/* avoid hogging the CPU for too long */
@ -329,11 +329,10 @@ static int gcm_encrypt(struct aead_request *req, char *iv, int assoclen)
tag = NULL;
}
kernel_neon_begin();
pmull_gcm_encrypt(nbytes, dst, src, ctx->ghash_key.h,
dg, iv, ctx->aes_key.key_enc, nrounds,
tag);
kernel_neon_end();
scoped_ksimd()
pmull_gcm_encrypt(nbytes, dst, src, ctx->ghash_key.h,
dg, iv, ctx->aes_key.key_enc, nrounds,
tag);
if (unlikely(!nbytes))
break;
@ -399,11 +398,11 @@ static int gcm_decrypt(struct aead_request *req, char *iv, int assoclen)
tag = NULL;
}
kernel_neon_begin();
ret = pmull_gcm_decrypt(nbytes, dst, src, ctx->ghash_key.h,
dg, iv, ctx->aes_key.key_enc,
nrounds, tag, otag, authsize);
kernel_neon_end();
scoped_ksimd()
ret = pmull_gcm_decrypt(nbytes, dst, src,
ctx->ghash_key.h,
dg, iv, ctx->aes_key.key_enc,
nrounds, tag, otag, authsize);
if (unlikely(!nbytes))
break;