From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from smtp.kernel.org (aws-us-west-2-korg-mail-alma10-1.taild15c8.ts.net [100.103.45.18]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 824403DDDAB; Wed, 5 Aug 2026 06:33:40 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=100.103.45.18 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1785911621; cv=none; b=gIgkgr28bP9g3jw2At5/cEsfSJI+i5pwxBgDefxcjHbI1jD6UhTOeuYsG3QNo9knm6PEjvPqgziee4v264LeuTcRd3oEnuQ1/+4j3ha7J+31UDSIRj8RJPWWJ2Eb96bH+CJAqdtMVFygaWSRQlvnT3qxADyIzMFk40fJ0h6MpDg= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1785911621; c=relaxed/simple; bh=APxQx5dWo+xAcvxP1fewVRbuvrtZKgJKaoenzO4YTa0=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=GZf8h1MOLrBCpfWErhjyHo4QSr5cf9uj08QGyPt6uq06CSzLr7ugn9GaLHqgVAYoz42j5se4Q+Jsu+lA8n8WqV6z/7v4J6lYzMd+NnsDy1/9zTjxTfwrTguzyu1z7pC948DHq7uEpo5DZOQHIwPUg71b1nqdlbsAr2kjxf7cCek= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b=Vl28a5tD; arc=none smtp.client-ip=100.103.45.18 Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b="Vl28a5tD" Received: by smtp.kernel.org (Postfix) with ESMTPSA id 9B6821F00A3A; Wed, 5 Aug 2026 06:33:35 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=kernel.org; s=k20260515; t=1785911620; bh=Gq3cGAu0BaOnCuHNL8771EcN54SBHzT0LE23CmXIUFs=; h=From:To:Cc:Subject:Date:In-Reply-To:References; b=Vl28a5tD4rpIAeXzedXYjUFh8icyK8MFNqj7YcU399QtldDQb6hSiiFaLJkkoJyL5 dkWK5amQl2H9624sIooM2S1hbw0sCRWQ7AT+UZHVhQ+tlGx/gX1w/1kftGPKU7r0pL ZVDvHnkiA9HoP1VEk346LduOgyGVz26VgFGF6VYAuDGwW8r4mhgbJCRwvN3sM3MviC CsXxFFOnzhl3yB0pKb0+WXcvq9PCeyrNkw7AkJjCr5oQstWPnUViV1lpeH9x7L8oRY JbzwqNd4aSIquJ4moxo8SjN9NQJ/xiYa3gRgtvwdZazt1S/oEewoRXnb5NBHl2oC9N 610hlugqdkASA== From: "Aneesh Kumar K.V (Arm)" To: linux-coco@lists.linux.dev, linux-arm-kernel@lists.infradead.org, linux-kernel@vger.kernel.org Cc: "Aneesh Kumar K.V (Arm)" , Catalin Marinas , Greg KH , Jeremy Linton , Jonathan Cameron , Lorenzo Pieralisi , Mark Rutland , Sudeep Holla , Will Deacon , Steven Price , Suzuki K Poulose , Andre Przywara Subject: [PATCH v9 4/7] arm64: realm: Move Realm memory encryption ops to RSI code Date: Wed, 5 Aug 2026 12:02:52 +0530 Message-ID: <20260805063255.1638614-5-aneesh.kumar@kernel.org> X-Mailer: git-send-email 2.43.0 In-Reply-To: <20260805063255.1638614-1-aneesh.kumar@kernel.org> References: <20260805063255.1638614-1-aneesh.kumar@kernel.org> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit Realm memory encryption callbacks are CCA-specific. Keep the Realm callback registration with the RSI initialization code instead of pageattr.c, which only needs to provide the low-level page-attribute transition helper. Export __set_memory_enc_dec() within arm64 so the RSI code can wrap it with the Realm-specific encrypt/decrypt callbacks and warning policy. No functional changes in this patch. Signed-off-by: Aneesh Kumar K.V (Arm) --- arch/arm64/include/asm/mem_encrypt.h | 3 +-- arch/arm64/mm/pageattr.c | 38 +--------------------------- drivers/firmware/arm_rmm/rsi.c | 34 +++++++++++++++++++++++++ 3 files changed, 36 insertions(+), 39 deletions(-) diff --git a/arch/arm64/include/asm/mem_encrypt.h b/arch/arm64/include/asm/mem_encrypt.h index f03b9d7b83b4..ef8b8463e52b 100644 --- a/arch/arm64/include/asm/mem_encrypt.h +++ b/arch/arm64/include/asm/mem_encrypt.h @@ -16,8 +16,7 @@ int arm64_mem_crypt_ops_register(const struct arm64_mem_crypt_ops *ops); int set_memory_encrypted(unsigned long addr, int numpages); int set_memory_decrypted(unsigned long addr, int numpages); - -int realm_register_memory_enc_ops(void); +int __set_memory_enc_dec(unsigned long addr, int numpages, bool encrypt); static inline bool force_dma_unencrypted(struct device *dev) { diff --git a/arch/arm64/mm/pageattr.c b/arch/arm64/mm/pageattr.c index bbe98ac9ad8c..14b2a3801f40 100644 --- a/arch/arm64/mm/pageattr.c +++ b/arch/arm64/mm/pageattr.c @@ -275,9 +275,7 @@ int set_direct_map_default_noflush(struct page *page) PAGE_SIZE, set_mask, clear_mask); } -static int __set_memory_enc_dec(unsigned long addr, - int numpages, - bool encrypt) +int __set_memory_enc_dec(unsigned long addr, int numpages, bool encrypt) { unsigned long set_prot = 0, clear_prot = 0; phys_addr_t start, end; @@ -321,40 +319,6 @@ static int __set_memory_enc_dec(unsigned long addr, __pgprot(PTE_PRESENT_INVALID)); } -static int realm_set_memory_encrypted(unsigned long addr, int numpages) -{ - int ret = __set_memory_enc_dec(addr, numpages, true); - - /* - * If the request to change state fails, then the only sensible cause - * of action for the caller is to leak the memory - */ - WARN(ret, "Failed to encrypt memory, %d pages will be leaked", - numpages); - - return ret; -} - -static int realm_set_memory_decrypted(unsigned long addr, int numpages) -{ - int ret = __set_memory_enc_dec(addr, numpages, false); - - WARN(ret, "Failed to decrypt memory, %d pages will be leaked", - numpages); - - return ret; -} - -static const struct arm64_mem_crypt_ops realm_crypt_ops = { - .encrypt = realm_set_memory_encrypted, - .decrypt = realm_set_memory_decrypted, -}; - -int realm_register_memory_enc_ops(void) -{ - return arm64_mem_crypt_ops_register(&realm_crypt_ops); -} - int set_direct_map_valid_noflush(struct page *page, unsigned nr, bool valid) { unsigned long addr = (unsigned long)page_address(page); diff --git a/drivers/firmware/arm_rmm/rsi.c b/drivers/firmware/arm_rmm/rsi.c index 8e716f1c1e31..ada139d0e344 100644 --- a/drivers/firmware/arm_rmm/rsi.c +++ b/drivers/firmware/arm_rmm/rsi.c @@ -127,6 +127,40 @@ static int realm_ioremap_hook(phys_addr_t phys, size_t size, pgprot_t *prot) return 0; } +static int realm_set_memory_encrypted(unsigned long addr, int numpages) +{ + int ret = __set_memory_enc_dec(addr, numpages, true); + + /* + * If the request to change state fails, then the only sensible cause + * of action for the caller is to leak the memory + */ + WARN(ret, "Failed to encrypt memory, %d pages will be leaked", + numpages); + + return ret; +} + +static int realm_set_memory_decrypted(unsigned long addr, int numpages) +{ + int ret = __set_memory_enc_dec(addr, numpages, false); + + WARN(ret, "Failed to decrypt memory, %d pages will be leaked", + numpages); + + return ret; +} + +static const struct arm64_mem_crypt_ops realm_crypt_ops = { + .encrypt = realm_set_memory_encrypted, + .decrypt = realm_set_memory_decrypted, +}; + +static int realm_register_memory_enc_ops(void) +{ + return arm64_mem_crypt_ops_register(&realm_crypt_ops); +} + void __init arm64_rsi_init(void) { if (arm_smccc_1_1_get_conduit() != SMCCC_CONDUIT_SMC) -- 2.43.0