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crypto/arm64: sha3 - Switch to 'ksimd' scoped guard API

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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 13:47:13 +02:00
parent 931ceb5785
commit a6b4084455
1 changed files with 4 additions and 6 deletions
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10
arch/arm64/crypto/sha3-ce-glue.c
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@@ -46,9 +46,8 @@ static int sha3_update(struct shash_desc *desc, const u8 *data,
do {
int rem;
kernel_neon_begin();
rem = sha3_ce_transform(sctx->st, data, blocks, ds);
kernel_neon_end();
scoped_ksimd()
rem = sha3_ce_transform(sctx->st, data, blocks, ds);
data += (blocks - rem) * bs;
blocks = rem;
} while (blocks);
@@ -73,9 +72,8 @@ static int sha3_finup(struct shash_desc *desc, const u8 *src, unsigned int len,
memset(block + len, 0, bs - len);
block[bs - 1] |= 0x80;
kernel_neon_begin();
sha3_ce_transform(sctx->st, block, 1, ds);
kernel_neon_end();
scoped_ksimd()
sha3_ce_transform(sctx->st, block, 1, ds);
memzero_explicit(block , sizeof(block));
for (i = 0; i < ds / 8; i++)