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Received-SPF: Pass (protection.outlook.com: domain of amd.com designates 165.204.84.17 as permitted sender) receiver=protection.outlook.com; client-ip=165.204.84.17; helo=SATLEXMB04.amd.com; pr=C Received: from SATLEXMB04.amd.com (165.204.84.17) by CY4PEPF0000EE30.mail.protection.outlook.com (10.167.242.36) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_128_GCM_SHA256) id 15.20.7897.11 via Frontend Transport; Fri, 23 Aug 2024 13:32:03 +0000 Received: from aiemdee.2.ozlabs.ru (10.180.168.240) by SATLEXMB04.amd.com (10.181.40.145) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_128_GCM_SHA256) id 15.1.2507.39; Fri, 23 Aug 2024 08:31:57 -0500 From: Alexey Kardashevskiy To: CC: , , , Suravee Suthikulpanit , Alex Williamson , Dan Williams , , , , , Santosh Shukla , Tom Lendacky , Michael Roth , "Alexander Graf" , Nikunj A Dadhania , Vasant Hegde , Lukas Wunner , Alexey Kardashevskiy Subject: [RFC PATCH 16/21] coco/sev-guest: Make SEV-to-PSP request helpers public Date: Fri, 23 Aug 2024 23:21:30 +1000 Message-ID: <20240823132137.336874-17-aik@amd.com> X-Mailer: git-send-email 2.45.2 In-Reply-To: <20240823132137.336874-1-aik@amd.com> References: <20240823132137.336874-1-aik@amd.com> Precedence: bulk X-Mailing-List: linux-pci@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-ClientProxiedBy: SATLEXMB03.amd.com (10.181.40.144) To SATLEXMB04.amd.com (10.181.40.145) X-EOPAttributedMessage: 0 X-MS-PublicTrafficType: Email X-MS-TrafficTypeDiagnostic: CY4PEPF0000EE30:EE_|PH8PR12MB6747:EE_ X-MS-Office365-Filtering-Correlation-Id: a6eea877-7511-4e31-caec-08dcc377f9c9 X-MS-Exchange-SenderADCheck: 1 X-MS-Exchange-AntiSpam-Relay: 0 X-Microsoft-Antispam: BCL:0;ARA:13230040|1800799024|376014|36860700013|82310400026; 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No functional change intended. Signed-off-by: Alexey Kardashevskiy --- drivers/virt/coco/sev-guest/sev-guest.h | 54 ++++++++++++++++++++ drivers/virt/coco/sev-guest/sev_guest.c | 42 +++------------ 2 files changed, 60 insertions(+), 36 deletions(-) diff --git a/drivers/virt/coco/sev-guest/sev-guest.h b/drivers/virt/coco/sev-guest/sev-guest.h new file mode 100644 index 000000000000..765f42ff55aa --- /dev/null +++ b/drivers/virt/coco/sev-guest/sev-guest.h @@ -0,0 +1,54 @@ +/* SPDX-License-Identifier: GPL-2.0-only */ +/* + * Copyright (C) 2024 Advanced Micro Devices, Inc. + */ + +#ifndef __VIRT_SEVGUEST_H__ +#define __VIRT_SEVGUEST_H__ + +#include +#include + +struct snp_guest_crypto { + struct crypto_aead *tfm; + u8 *iv, *authtag; + int iv_len, a_len; +}; + +struct snp_guest_dev { + struct device *dev; + struct miscdevice misc; + + void *certs_data; + struct snp_guest_crypto *crypto; + /* request and response are in unencrypted memory */ + struct snp_guest_msg *request, *response; + + /* + * Avoid information leakage by double-buffering shared messages + * in fields that are in regular encrypted memory. + */ + struct snp_guest_msg secret_request, secret_response; + + struct snp_secrets_page *secrets; + struct snp_req_data input; + union { + struct snp_report_req report; + struct snp_derived_key_req derived_key; + struct snp_ext_report_req ext_report; + } req; + u32 *os_area_msg_seqno; + u8 *vmpck; +}; + +extern struct mutex snp_cmd_mutex; + +int handle_guest_request(struct snp_guest_dev *snp_dev, u64 exit_code, + struct snp_guest_request_ioctl *rio, u8 type, + void *req_buf, size_t req_sz, void *resp_buf, + u32 resp_sz); + +void *alloc_shared_pages(struct device *dev, size_t sz); +void free_shared_pages(void *buf, size_t sz); + +#endif /* __VIRT_SEVGUEST_H__ */ diff --git a/drivers/virt/coco/sev-guest/sev_guest.c b/drivers/virt/coco/sev-guest/sev_guest.c index ecc6176633be..d04d270f359e 100644 --- a/drivers/virt/coco/sev-guest/sev_guest.c +++ b/drivers/virt/coco/sev-guest/sev_guest.c @@ -30,6 +30,8 @@ #include #include +#include "sev-guest.h" + #define DEVICE_NAME "sev-guest" #define AAD_LEN 48 #define MSG_HDR_VER 1 @@ -39,38 +41,6 @@ #define SVSM_MAX_RETRIES 3 -struct snp_guest_crypto { - struct crypto_aead *tfm; - u8 *iv, *authtag; - int iv_len, a_len; -}; - -struct snp_guest_dev { - struct device *dev; - struct miscdevice misc; - - void *certs_data; - struct snp_guest_crypto *crypto; - /* request and response are in unencrypted memory */ - struct snp_guest_msg *request, *response; - - /* - * Avoid information leakage by double-buffering shared messages - * in fields that are in regular encrypted memory. - */ - struct snp_guest_msg secret_request, secret_response; - - struct snp_secrets_page *secrets; - struct snp_req_data input; - union { - struct snp_report_req report; - struct snp_derived_key_req derived_key; - struct snp_ext_report_req ext_report; - } req; - u32 *os_area_msg_seqno; - u8 *vmpck; -}; - /* * The VMPCK ID represents the key used by the SNP guest to communicate with the * SEV firmware in the AMD Secure Processor (ASP, aka PSP). By default, the key @@ -83,7 +53,7 @@ module_param(vmpck_id, int, 0444); MODULE_PARM_DESC(vmpck_id, "The VMPCK ID to use when communicating with the PSP."); /* Mutex to serialize the shared buffer access and command handling. */ -static DEFINE_MUTEX(snp_cmd_mutex); +DEFINE_MUTEX(snp_cmd_mutex); static bool is_vmpck_empty(struct snp_guest_dev *snp_dev) { @@ -435,7 +405,7 @@ static int __handle_guest_request(struct snp_guest_dev *snp_dev, u64 exit_code, return rc; } -static int handle_guest_request(struct snp_guest_dev *snp_dev, u64 exit_code, +int handle_guest_request(struct snp_guest_dev *snp_dev, u64 exit_code, struct snp_guest_request_ioctl *rio, u8 type, void *req_buf, size_t req_sz, void *resp_buf, u32 resp_sz) @@ -709,7 +679,7 @@ static long snp_guest_ioctl(struct file *file, unsigned int ioctl, unsigned long return ret; } -static void free_shared_pages(void *buf, size_t sz) +void free_shared_pages(void *buf, size_t sz) { unsigned int npages = PAGE_ALIGN(sz) >> PAGE_SHIFT; int ret; @@ -726,7 +696,7 @@ static void free_shared_pages(void *buf, size_t sz) __free_pages(virt_to_page(buf), get_order(sz)); } -static void *alloc_shared_pages(struct device *dev, size_t sz) +void *alloc_shared_pages(struct device *dev, size_t sz) { unsigned int npages = PAGE_ALIGN(sz) >> PAGE_SHIFT; struct page *page;