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/* SPDX-License-Identifier: GPL-2.0-or-later */
/*
* GHASH optimized using the CP Assist for Cryptographic Functions (CPACF)
*
* Copyright 2026 Google LLC
*/
#include <asm/cpacf.h>
#include <linux/cpufeature.h>
static __ro_after_init DEFINE_STATIC_KEY_FALSE(have_cpacf_ghash);
#define ghash_preparekey_arch ghash_preparekey_arch
static void ghash_preparekey_arch(struct ghash_key *key,
const u8 raw_key[GHASH_BLOCK_SIZE])
{
/* Save key in POLYVAL format for fallback */
ghash_key_to_polyval(raw_key, &key->h);
/* Save key in GHASH format for CPACF_KIMD_GHASH */
memcpy(key->h_raw, raw_key, GHASH_BLOCK_SIZE);
}
#define ghash_blocks_arch ghash_blocks_arch
static void ghash_blocks_arch(struct polyval_elem *acc,
const struct ghash_key *key,
const u8 *data, size_t nblocks)
{
if (static_branch_likely(&have_cpacf_ghash)) {
/*
* CPACF_KIMD_GHASH requires the accumulator and key in a single
* buffer, each using the GHASH convention.
*/
u8 ctx[2][GHASH_BLOCK_SIZE] __aligned(8);
polyval_acc_to_ghash(acc, ctx[0]);
memcpy(ctx[1], key->h_raw, GHASH_BLOCK_SIZE);
cpacf_kimd(CPACF_KIMD_GHASH, ctx, data,
nblocks * GHASH_BLOCK_SIZE);
ghash_acc_to_polyval(ctx[0], acc);
memzero_explicit(ctx, sizeof(ctx));
} else {
ghash_blocks_generic(acc, &key->h, data, nblocks);
}
}
#define gf128hash_mod_init_arch gf128hash_mod_init_arch
static void gf128hash_mod_init_arch(void)
{
if (cpu_have_feature(S390_CPU_FEATURE_MSA) &&
cpacf_query_func(CPACF_KIMD, CPACF_KIMD_GHASH))
static_branch_enable(&have_cpacf_ghash);
}
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