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Peter Anvin" , Ard Biesheuvel , Paolo Bonzini , Sean Christopherson , Vitaly Kuznetsov , Wanpeng Li , Jim Mattson , Andy Lutomirski , Dave Hansen , Sergio Lopez , Peter Gonda , Peter Zijlstra , Srinivas Pandruvada , David Rientjes , Dov Murik , Tobin Feldman-Fitzthum , Borislav Petkov , Michael Roth , Vlastimil Babka , tony.luck@intel.com, npmccallum@redhat.com, brijesh.ksingh@gmail.com, Brijesh Singh Subject: [PATCH Part2 RFC v4 17/40] crypto: ccp: Add the SNP_PLATFORM_STATUS command Date: Wed, 7 Jul 2021 13:35:53 -0500 Message-Id: <20210707183616.5620-18-brijesh.singh@amd.com> X-Mailer: git-send-email 2.17.1 In-Reply-To: <20210707183616.5620-1-brijesh.singh@amd.com> References: <20210707183616.5620-1-brijesh.singh@amd.com> X-ClientProxiedBy: SN6PR04CA0078.namprd04.prod.outlook.com (2603:10b6:805:f2::19) To BYAPR12MB2711.namprd12.prod.outlook.com (2603:10b6:a03:63::10) MIME-Version: 1.0 X-MS-Exchange-MessageSentRepresentingType: 1 Received: from sbrijesh-desktop.amd.com (165.204.77.1) by SN6PR04CA0078.namprd04.prod.outlook.com (2603:10b6:805:f2::19) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.20.4308.20 via Frontend Transport; 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See the SEV-SNP spec for more details. Signed-off-by: Brijesh Singh --- Documentation/virt/coco/sevguest.rst | 27 ++++++++++++++++++++++++ drivers/crypto/ccp/sev-dev.c | 31 ++++++++++++++++++++++++++++ drivers/crypto/ccp/sev-dev.h | 1 + include/uapi/linux/psp-sev.h | 1 + 4 files changed, 60 insertions(+) diff --git a/Documentation/virt/coco/sevguest.rst b/Documentation/virt/coco/sevguest.rst index 7acb8696fca4..7c51da010039 100644 --- a/Documentation/virt/coco/sevguest.rst +++ b/Documentation/virt/coco/sevguest.rst @@ -52,6 +52,22 @@ to execute due to the firmware error, then fw_err code will be set. __u64 fw_err; }; +The host ioctl should be called to /dev/sev device. The ioctl accepts command +id and command input structure. + +:: + struct sev_issue_cmd { + /* Command ID */ + __u32 cmd; + + /* Command request structure */ + __u64 data; + + /* firmware error code on failure (see psp-sev.h) */ + __u32 error; + }; + + 2.1 SNP_GET_REPORT ------------------ @@ -107,3 +123,14 @@ length of the blob is lesser than expected then snp_ext_report_req.certs_len wil be updated with the expected value. See GHCB specification for further detail on how to parse the certificate blob. + +2.3 SNP_PLATFORM_STATUS +----------------------- +:Technology: sev-snp +:Type: hypervisor ioctl cmd +:Parameters (in): struct sev_data_snp_platform_status +:Returns (out): 0 on success, -negative on error + +The SNP_PLATFORM_STATUS command is used to query the SNP platform status. The +status includes API major, minor version and more. See the SEV-SNP +specification for further details. diff --git a/drivers/crypto/ccp/sev-dev.c b/drivers/crypto/ccp/sev-dev.c index 16f0d9211739..65003aba807a 100644 --- a/drivers/crypto/ccp/sev-dev.c +++ b/drivers/crypto/ccp/sev-dev.c @@ -1056,6 +1056,7 @@ static int __sev_snp_init_locked(int *error) dev_dbg(sev->dev, "SEV-SNP firmware initialized\n"); sev_es_tmr_size = SEV_SNP_ES_TMR_SIZE; + sev->snp_plat_status_page = __snp_alloc_firmware_pages(GFP_KERNEL_ACCOUNT, 0, true); return rc; } @@ -1083,6 +1084,9 @@ static int __sev_snp_shutdown_locked(int *error) if (!sev->snp_inited) return 0; + /* Free the status page */ + __snp_free_firmware_pages(sev->snp_plat_status_page, 0, true); + /* SHUTDOWN requires the DF_FLUSH */ wbinvd_on_all_cpus(); __sev_do_cmd_locked(SEV_CMD_SNP_DF_FLUSH, NULL, NULL); @@ -1345,6 +1349,30 @@ static int sev_ioctl_do_pdh_export(struct sev_issue_cmd *argp, bool writable) return ret; } +static int sev_ioctl_snp_platform_status(struct sev_issue_cmd *argp) +{ + struct sev_device *sev = psp_master->sev_data; + struct sev_data_snp_platform_status_buf buf; + int ret; + + if (!sev->snp_inited || !argp->data) + return -EINVAL; + + if (!sev->snp_plat_status_page) + return -ENOMEM; + + buf.status_paddr = __psp_pa(page_address(sev->snp_plat_status_page)); + ret = __sev_do_cmd_locked(SEV_CMD_SNP_PLATFORM_STATUS, &buf, &argp->error); + if (ret) + return ret; + + if (copy_to_user((void __user *)argp->data, page_address(sev->snp_plat_status_page), + sizeof(struct sev_user_data_snp_status))) + return -EFAULT; + + return 0; +} + static long sev_ioctl(struct file *file, unsigned int ioctl, unsigned long arg) { void __user *argp = (void __user *)arg; @@ -1396,6 +1424,9 @@ static long sev_ioctl(struct file *file, unsigned int ioctl, unsigned long arg) case SEV_GET_ID2: ret = sev_ioctl_do_get_id2(&input); break; + case SNP_PLATFORM_STATUS: + ret = sev_ioctl_snp_platform_status(&input); + break; default: ret = -EINVAL; goto out; diff --git a/drivers/crypto/ccp/sev-dev.h b/drivers/crypto/ccp/sev-dev.h index fe5d7a3ebace..5efe162ad82d 100644 --- a/drivers/crypto/ccp/sev-dev.h +++ b/drivers/crypto/ccp/sev-dev.h @@ -66,6 +66,7 @@ struct sev_device { bool snp_inited; struct snp_host_map snp_host_map[MAX_SNP_HOST_MAP_BUFS]; + struct page *snp_plat_status_page; }; int sev_dev_init(struct psp_device *psp); diff --git a/include/uapi/linux/psp-sev.h b/include/uapi/linux/psp-sev.h index 226de6330a18..0c383d322097 100644 --- a/include/uapi/linux/psp-sev.h +++ b/include/uapi/linux/psp-sev.h @@ -28,6 +28,7 @@ enum { SEV_PEK_CERT_IMPORT, SEV_GET_ID, /* This command is deprecated, use SEV_GET_ID2 */ SEV_GET_ID2, + SNP_PLATFORM_STATUS = 256, SEV_MAX, };