From 119e9db233ad0f4cbd4cfb9f9385a7bca378b37d Mon Sep 17 00:00:00 2001 From: Zeng Chi Date: Mon, 21 Sep 2026 18:24:42 +0800 Subject: KVM: Don't pre-reserve xarray entries when storing empty/NULL attributes Skip the xarray reservation loop when clearing all memory attributes, as storing NULL only erases the entry and never needs to allocate, so no reservation (and no cleanup of a failed one) is required in that case. Suggested-by: Sean Christopherson Cc: David Ballesteros Signed-off-by: Zeng Chi Link: https://patch.msgid.link/20260921102442.1232375-1-zeng_chi911@163.com [sean: split to separate patch] Signed-off-by: Sean Christopherson --- crypto/sm3.c | 89 ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 89 insertions(+) create mode 100644 crypto/sm3.c (limited to 'crypto/sm3.c') diff --git a/crypto/sm3.c b/crypto/sm3.c new file mode 100644 index 000000000..05111a99b --- /dev/null +++ b/crypto/sm3.c @@ -0,0 +1,89 @@ +// SPDX-License-Identifier: GPL-2.0-only +/* + * SM3 secure hash, as specified by OSCCA GM/T 0004-2012 SM3 and + * described at https://tools.ietf.org/html/draft-shen-sm3-hash-01 + * + * Copyright (C) 2017 ARM Limited or its affiliates. + * Written by Gilad Ben-Yossef + * Copyright (C) 2021 Tianjia Zhang + * Copyright 2026 Google LLC + */ + +#include +#include +#include +#include + +#define SM3_CTX(desc) ((struct sm3_ctx *)shash_desc_ctx(desc)) + +static int crypto_sm3_init(struct shash_desc *desc) +{ + sm3_init(SM3_CTX(desc)); + return 0; +} + +static int crypto_sm3_update(struct shash_desc *desc, + const u8 *data, unsigned int len) +{ + sm3_update(SM3_CTX(desc), data, len); + return 0; +} + +static int crypto_sm3_final(struct shash_desc *desc, u8 *out) +{ + sm3_final(SM3_CTX(desc), out); + return 0; +} + +static int crypto_sm3_digest(struct shash_desc *desc, + const u8 *data, unsigned int len, u8 *out) +{ + sm3(data, len, out); + return 0; +} + +static int crypto_sm3_export_core(struct shash_desc *desc, void *out) +{ + memcpy(out, SM3_CTX(desc), sizeof(struct sm3_ctx)); + return 0; +} + +static int crypto_sm3_import_core(struct shash_desc *desc, const void *in) +{ + memcpy(SM3_CTX(desc), in, sizeof(struct sm3_ctx)); + return 0; +} + +static struct shash_alg sm3_alg = { + .base.cra_name = "sm3", + .base.cra_driver_name = "sm3-lib", + .base.cra_priority = 300, + .base.cra_blocksize = SM3_BLOCK_SIZE, + .base.cra_module = THIS_MODULE, + .digestsize = SM3_DIGEST_SIZE, + .init = crypto_sm3_init, + .update = crypto_sm3_update, + .final = crypto_sm3_final, + .digest = crypto_sm3_digest, + .export_core = crypto_sm3_export_core, + .import_core = crypto_sm3_import_core, + .descsize = sizeof(struct sm3_ctx), +}; + +static int __init crypto_sm3_mod_init(void) +{ + return crypto_register_shash(&sm3_alg); +} +module_init(crypto_sm3_mod_init); + +static void __exit crypto_sm3_mod_exit(void) +{ + crypto_unregister_shash(&sm3_alg); +} +module_exit(crypto_sm3_mod_exit); + +MODULE_LICENSE("GPL v2"); +MODULE_DESCRIPTION("Crypto API support for SM3"); + +MODULE_ALIAS_CRYPTO("sm3"); +MODULE_ALIAS_CRYPTO("sm3-lib"); -- cgit v1.3.1