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Shutemov" , Andi Kleen , tony.luck@intel.com, marcorr@google.com, sathyanarayanan.kuppuswamy@linux.intel.com, Brijesh Singh Subject: [PATCH Part1 v5 33/38] x86/sev: Provide support for SNP guest request NAEs Date: Fri, 20 Aug 2021 10:19:28 -0500 Message-Id: <20210820151933.22401-34-brijesh.singh@amd.com> X-Mailer: git-send-email 2.17.1 In-Reply-To: <20210820151933.22401-1-brijesh.singh@amd.com> References: <20210820151933.22401-1-brijesh.singh@amd.com> Content-Type: text/plain X-ClientProxiedBy: SA9P223CA0002.NAMP223.PROD.OUTLOOK.COM (2603:10b6:806:26::7) To SN6PR12MB2718.namprd12.prod.outlook.com (2603:10b6:805:6f::22) Precedence: bulk X-Mailing-List: linux-coco@lists.linux.dev List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-MS-Exchange-MessageSentRepresentingType: 1 Received: from sbrijesh-desktop.amd.com (165.204.77.1) by SA9P223CA0002.NAMP223.PROD.OUTLOOK.COM (2603:10b6:806:26::7) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.20.4436.19 via Frontend Transport; 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X-MS-Exchange-AntiSpam-MessageData-ChunkCount: 1 X-MS-Exchange-AntiSpam-MessageData-0: =?us-ascii?Q?V//6ThvtQucLQX8n8H0MaKB/WwIUab5XSgYH8X3AJGiVNjiYGtRq3mKULR98?= =?us-ascii?Q?rywaYocKmUGOxsLLsOmmEzQlLIYgkQiyYs0IbTJt8VmNpCosELYDUxhKIDs6?= =?us-ascii?Q?A/FOMdfXTwfXgK/yAGzSgqTmwbF91HKAs2fygL3dRv+/8cbavE4fnzq211hC?= =?us-ascii?Q?gs6srnjNmimEqUdANRFK89PtClCGsm2D1bVUqNYfs4h0667qeuWfMsoKxYZr?= =?us-ascii?Q?xLZzSyJPSQwuOZ9KCNsERrEYwYP8j2z8XFs2rsYUT0/O3azOK/zGvZbPmXY/?= =?us-ascii?Q?bOR6U6AtoN0CB1oaXTACxWZpW6qIdiGPnizO/4JP/EeDfnY6YAcscDC2kZwG?= =?us-ascii?Q?vG47+UQ6EeEX1kBg+mCffYhe0PruhQXRogM90ZxJe9wSvBwh5QuV6oi4HfAm?= =?us-ascii?Q?zTRdcbaTyFN1yUN4n/XGuUE42kStfoY0i6ulRBY5HwTjVEJ5e4wifSgKDM1H?= =?us-ascii?Q?xfxpiDdCLcxdEI10r+Ie0BLA0OxolU0ZHgU7LXHHZbPt0cg/YFQISj6UlD/F?= =?us-ascii?Q?IKHZVbtBp8H+WN+XqP2d7Da+tPqSipVEuoPBjYBzK0K77gro3uab6Zmc50DC?= =?us-ascii?Q?WtjQTqAw2Dwg4Vy2oU50DsOnQCpHwvhouvsWRC9nnqLYqr2QQ3TL4dZBfIFd?= =?us-ascii?Q?rGUqc3C/lVk44rUMJk29YjiEGcSkOg3rgzIxvSC0HBoA+Uc5FGZuXqXbrIi6?= =?us-ascii?Q?STHC62UJNyaNXtqnteCKxHmQTLpw2w4ilh4uiExrxGnD6BqT4fTIlfLlM8N1?= =?us-ascii?Q?IC0SNywGhRFClKsVaDNMj3srk84XOuKg5iNigWMvzjDcxnaz7X1vm2YnzAqU?= =?us-ascii?Q?bG4ERVNPXkfCkG+kljJfFksVvGiBnUu+3+J8emw/0/OZJZKh/zJckbj0iwQA?= =?us-ascii?Q?ag7gRc1RSfRZxPZ/aqrkdnE7WxdghksJFrYGjbPXVh9iQemHxB4cGKuh7EgR?= =?us-ascii?Q?sJkSls32xJMuD5E65T/z8uXuNGxFikXRJzE0YqfyRNySz3/2XQarGRUeK3pK?= =?us-ascii?Q?8xjvUpcrgZJNyAhdtaMhYBiFQvRCebECwsh7QpphVpvZ0UMMLLLBLUhL1Psz?= =?us-ascii?Q?zhiCs/wlei/hVlnC8yBmiHrRVrfZ1spHr2CqWM5clIjKqwom89ctwDctdiGP?= =?us-ascii?Q?F+Uoyz04nUtlYF1AV7ruBj1n0Ulj+muewVpNd4QdvynRMm33Y7c9mLALAq4t?= =?us-ascii?Q?NBZQyHhegnxnR/F8veW6HxFF4L0lDqvSourYujfHJRUXkWGD5FTHSYdJDlWw?= =?us-ascii?Q?iwPBG/JdtRX9vaB2Pqbp144JRtNzWWPs05m4Bpg/Djmt2JpRb59clyE3130l?= =?us-ascii?Q?dgrhy/DCyiOPLBnWK/TJ9eyx?= X-OriginatorOrg: amd.com X-MS-Exchange-CrossTenant-Network-Message-Id: b1ec3b5e-e405-44da-cce9-08d963ee2fc5 X-MS-Exchange-CrossTenant-AuthSource: SN6PR12MB2718.namprd12.prod.outlook.com X-MS-Exchange-CrossTenant-AuthAs: Internal X-MS-Exchange-CrossTenant-OriginalArrivalTime: 20 Aug 2021 15:21:30.6583 (UTC) X-MS-Exchange-CrossTenant-FromEntityHeader: Hosted X-MS-Exchange-CrossTenant-Id: 3dd8961f-e488-4e60-8e11-a82d994e183d X-MS-Exchange-CrossTenant-MailboxType: HOSTED X-MS-Exchange-CrossTenant-UserPrincipalName: AvFwSaghD71D/yq/IbLRqOANznqWMYHK/FTA4/55Ua2i99ISSBPGG9K0asoTD3+wP9Z03KXo4bpXvpMkr3vQ1g== X-MS-Exchange-Transport-CrossTenantHeadersStamped: SA0PR12MB4592 Version 2 of GHCB specification provides SNP_GUEST_REQUEST and SNP_EXT_GUEST_REQUEST NAE that can be used by the SNP guest to communicate with the PSP. While at it, add a snp_issue_guest_request() helper that can be used by driver or other subsystem to issue the request to PSP. See SEV-SNP and GHCB spec for more details. Signed-off-by: Brijesh Singh --- arch/x86/include/uapi/asm/svm.h | 4 +++ arch/x86/kernel/sev.c | 57 +++++++++++++++++++++++++++++++++ include/linux/sev-guest.h | 48 +++++++++++++++++++++++++++ 3 files changed, 109 insertions(+) create mode 100644 include/linux/sev-guest.h diff --git a/arch/x86/include/uapi/asm/svm.h b/arch/x86/include/uapi/asm/svm.h index 8b4c57baec52..5b8bc2b65a5e 100644 --- a/arch/x86/include/uapi/asm/svm.h +++ b/arch/x86/include/uapi/asm/svm.h @@ -109,6 +109,8 @@ #define SVM_VMGEXIT_SET_AP_JUMP_TABLE 0 #define SVM_VMGEXIT_GET_AP_JUMP_TABLE 1 #define SVM_VMGEXIT_PSC 0x80000010 +#define SVM_VMGEXIT_GUEST_REQUEST 0x80000011 +#define SVM_VMGEXIT_EXT_GUEST_REQUEST 0x80000012 #define SVM_VMGEXIT_AP_CREATION 0x80000013 #define SVM_VMGEXIT_AP_CREATE_ON_INIT 0 #define SVM_VMGEXIT_AP_CREATE 1 @@ -225,6 +227,8 @@ { SVM_VMGEXIT_AP_HLT_LOOP, "vmgexit_ap_hlt_loop" }, \ { SVM_VMGEXIT_AP_JUMP_TABLE, "vmgexit_ap_jump_table" }, \ { SVM_VMGEXIT_PSC, "vmgexit_page_state_change" }, \ + { SVM_VMGEXIT_GUEST_REQUEST, "vmgexit_guest_request" }, \ + { SVM_VMGEXIT_EXT_GUEST_REQUEST, "vmgexit_ext_guest_request" }, \ { SVM_VMGEXIT_AP_CREATION, "vmgexit_ap_creation" }, \ { SVM_VMGEXIT_HV_FEATURES, "vmgexit_hypervisor_feature" }, \ { SVM_EXIT_ERR, "invalid_guest_state" } diff --git a/arch/x86/kernel/sev.c b/arch/x86/kernel/sev.c index d7b6f7420551..319a40fc57ce 100644 --- a/arch/x86/kernel/sev.c +++ b/arch/x86/kernel/sev.c @@ -21,6 +21,7 @@ #include #include #include +#include #include #include @@ -2028,3 +2029,59 @@ bool __init handle_vc_boot_ghcb(struct pt_regs *regs) while (true) halt(); } + +int snp_issue_guest_request(int type, struct snp_guest_request_data *input, unsigned long *fw_err) +{ + struct ghcb_state state; + unsigned long id, flags; + struct ghcb *ghcb; + int ret; + + if (!sev_feature_enabled(SEV_SNP)) + return -ENODEV; + + local_irq_save(flags); + + ghcb = __sev_get_ghcb(&state); + if (!ghcb) { + ret = -EIO; + goto e_restore_irq; + } + + vc_ghcb_invalidate(ghcb); + + if (type == GUEST_REQUEST) { + id = SVM_VMGEXIT_GUEST_REQUEST; + } else if (type == EXT_GUEST_REQUEST) { + id = SVM_VMGEXIT_EXT_GUEST_REQUEST; + ghcb_set_rax(ghcb, input->data_gpa); + ghcb_set_rbx(ghcb, input->data_npages); + } else { + ret = -EINVAL; + goto e_put; + } + + ret = sev_es_ghcb_hv_call(ghcb, NULL, id, input->req_gpa, input->resp_gpa); + if (ret) + goto e_put; + + if (ghcb->save.sw_exit_info_2) { + /* Number of expected pages are returned in RBX */ + if (id == EXT_GUEST_REQUEST && + ghcb->save.sw_exit_info_2 == SNP_GUEST_REQ_INVALID_LEN) + input->data_npages = ghcb_get_rbx(ghcb); + + if (fw_err) + *fw_err = ghcb->save.sw_exit_info_2; + + ret = -EIO; + } + +e_put: + __sev_put_ghcb(&state); +e_restore_irq: + local_irq_restore(flags); + + return ret; +} +EXPORT_SYMBOL_GPL(snp_issue_guest_request); diff --git a/include/linux/sev-guest.h b/include/linux/sev-guest.h new file mode 100644 index 000000000000..24dd17507789 --- /dev/null +++ b/include/linux/sev-guest.h @@ -0,0 +1,48 @@ +/* SPDX-License-Identifier: GPL-2.0-only */ +/* + * AMD Secure Encrypted Virtualization (SEV) guest driver interface + * + * Copyright (C) 2021 Advanced Micro Devices, Inc. + * + * Author: Brijesh Singh + * + */ + +#ifndef __LINUX_SEV_GUEST_H_ +#define __LINUX_SEV_GUEST_H_ + +#include + +enum vmgexit_type { + GUEST_REQUEST, + EXT_GUEST_REQUEST, + + GUEST_REQUEST_MAX +}; + +/* + * The error code when the data_npages is too small. The error code + * is defined in the GHCB specification. + */ +#define SNP_GUEST_REQ_INVALID_LEN 0x100000000ULL + +struct snp_guest_request_data { + unsigned long req_gpa; + unsigned long resp_gpa; + unsigned long data_gpa; + unsigned int data_npages; +}; + +#ifdef CONFIG_AMD_MEM_ENCRYPT +int snp_issue_guest_request(int vmgexit_type, struct snp_guest_request_data *input, + unsigned long *fw_err); +#else + +static inline int snp_issue_guest_request(int type, struct snp_guest_request_data *input, + unsigned long *fw_err) +{ + return -ENODEV; +} + +#endif /* CONFIG_AMD_MEM_ENCRYPT */ +#endif /* __LINUX_SEV_GUEST_H__ */ -- 2.17.1