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Shutemov" , Andi Kleen , tony.luck@intel.com, marcorr@google.com, sathyanarayanan.kuppuswamy@linux.intel.com, Brijesh Singh Subject: [PATCH Part2 v5 18/45] crypto: ccp: Provide APIs to query extended attestation report Date: Fri, 20 Aug 2021 10:58:51 -0500 Message-Id: <20210820155918.7518-19-brijesh.singh@amd.com> X-Mailer: git-send-email 2.17.1 In-Reply-To: <20210820155918.7518-1-brijesh.singh@amd.com> References: <20210820155918.7518-1-brijesh.singh@amd.com> X-ClientProxiedBy: SN7P222CA0013.NAMP222.PROD.OUTLOOK.COM (2603:10b6:806:124::11) To SN6PR12MB2718.namprd12.prod.outlook.com (2603:10b6:805:6f::22) MIME-Version: 1.0 X-MS-Exchange-MessageSentRepresentingType: 1 Received: from sbrijesh-desktop.amd.com (165.204.77.1) by SN7P222CA0013.NAMP222.PROD.OUTLOOK.COM (2603:10b6:806:124::11) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.20.4436.18 via Frontend Transport; Fri, 20 Aug 2021 16:00:15 +0000 X-MS-PublicTrafficType: Email X-MS-Office365-Filtering-Correlation-Id: b98a94fc-dade-4d1c-8796-08d963f39a48 X-MS-TrafficTypeDiagnostic: SN6PR12MB2685: X-MS-Exchange-Transport-Forked: True X-Microsoft-Antispam-PRVS: X-MS-Oob-TLC-OOBClassifiers: OLM:7219; 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dkim=pass header.d=amd.com header.s=selector1 header.b=bKO4LLYu; dmarc=pass (policy=quarantine) header.from=amd.com; spf=pass (imf19.hostedemail.com: domain of brijesh.singh@amd.com designates 40.107.220.56 as permitted sender) smtp.mailfrom=brijesh.singh@amd.com X-HE-Tag: 1629475218-913984 X-Bogosity: Ham, tests=bogofilter, spamicity=0.000000, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: Version 2 of the GHCB specification defines VMGEXIT that is used to get the extended attestation report. The extended attestation report includes the certificate blobs provided through the SNP_SET_EXT_CONFIG. The snp_guest_ext_guest_request() will be used by the hypervisor to get the extended attestation report. See the GHCB specification for more details. Signed-off-by: Brijesh Singh --- drivers/crypto/ccp/sev-dev.c | 43 ++++++++++++++++++++++++++++++++++++ include/linux/psp-sev.h | 24 ++++++++++++++++++++ 2 files changed, 67 insertions(+) diff --git a/drivers/crypto/ccp/sev-dev.c b/drivers/crypto/ccp/sev-dev.c index 9ba194acbe85..e2650c3d0d0a 100644 --- a/drivers/crypto/ccp/sev-dev.c +++ b/drivers/crypto/ccp/sev-dev.c @@ -22,6 +22,7 @@ #include #include #include +#include #include @@ -1677,6 +1678,48 @@ int snp_guest_dbg_decrypt(struct sev_data_snp_dbg *data, int *error) } EXPORT_SYMBOL_GPL(snp_guest_dbg_decrypt); +int snp_guest_ext_guest_request(struct sev_data_snp_guest_request *data, + unsigned long vaddr, unsigned long *npages, unsigned long *fw_err) +{ + unsigned long expected_npages; + struct sev_device *sev; + int rc; + + if (!psp_master || !psp_master->sev_data) + return -ENODEV; + + sev = psp_master->sev_data; + + if (!sev->snp_inited) + return -EINVAL; + + /* + * Check if there is enough space to copy the certificate chain. Otherwise + * return ERROR code defined in the GHCB specification. + */ + expected_npages = sev->snp_certs_len >> PAGE_SHIFT; + if (*npages < expected_npages) { + *npages = expected_npages; + *fw_err = SNP_GUEST_REQ_INVALID_LEN; + return -EINVAL; + } + + rc = sev_do_cmd(SEV_CMD_SNP_GUEST_REQUEST, data, (int *)&fw_err); + if (rc) + return rc; + + /* Copy the certificate blob */ + if (sev->snp_certs_data) { + *npages = expected_npages; + memcpy((void *)vaddr, sev->snp_certs_data, *npages << PAGE_SHIFT); + } else { + *npages = 0; + } + + return rc; +} +EXPORT_SYMBOL_GPL(snp_guest_ext_guest_request); + static void sev_exit(struct kref *ref) { misc_deregister(&misc_dev->misc); diff --git a/include/linux/psp-sev.h b/include/linux/psp-sev.h index 00bd684dc094..ea94ce4d834a 100644 --- a/include/linux/psp-sev.h +++ b/include/linux/psp-sev.h @@ -924,6 +924,23 @@ void *psp_copy_user_blob(u64 uaddr, u32 len); void *snp_alloc_firmware_page(gfp_t mask); void snp_free_firmware_page(void *addr); +/** + * snp_guest_ext_guest_request - perform the SNP extended guest request command + * defined in the GHCB specification. + * + * @data: the input guest request structure + * @vaddr: address where the certificate blob need to be copied. + * @npages: number of pages for the certificate blob. + * If the specified page count is less than the certificate blob size, then the + * required page count is returned with error code defined in the GHCB spec. + * If the specified page count is more than the certificate blob size, then + * page count is updated to reflect the amount of valid data copied in the + * vaddr. + */ +int snp_guest_ext_guest_request(struct sev_data_snp_guest_request *data, + unsigned long vaddr, unsigned long *npages, + unsigned long *error); + #else /* !CONFIG_CRYPTO_DEV_SP_PSP */ static inline int @@ -971,6 +988,13 @@ static inline void *snp_alloc_firmware_page(gfp_t mask) static inline void snp_free_firmware_page(void *addr) { } +static inline int snp_guest_ext_guest_request(struct sev_data_snp_guest_request *data, + unsigned long vaddr, unsigned long *n, + unsigned long *error) +{ + return -ENODEV; +} + #endif /* CONFIG_CRYPTO_DEV_SP_PSP */ #endif /* __PSP_SEV_H__ */