From patchwork Wed Jul 7 18:35:55 2021 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Brijesh Singh X-Patchwork-Id: 12363941 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-18.7 required=3.0 tests=BAYES_00,DKIM_SIGNED, DKIM_VALID,DKIM_VALID_AU,HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_CR_TRAILER, INCLUDES_PATCH,MAILING_LIST_MULTI,MSGID_FROM_MTA_HEADER,SPF_HELO_NONE, SPF_PASS,USER_AGENT_GIT autolearn=unavailable autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 090B6C07E9B for ; Wed, 7 Jul 2021 19:10:45 +0000 (UTC) Received: from kanga.kvack.org (kanga.kvack.org [205.233.56.17]) by mail.kernel.org (Postfix) with ESMTP id 912CB61A13 for ; Wed, 7 Jul 2021 19:10:44 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org 912CB61A13 Authentication-Results: mail.kernel.org; dmarc=fail (p=quarantine dis=none) header.from=amd.com Authentication-Results: mail.kernel.org; spf=pass smtp.mailfrom=owner-linux-mm@kvack.org Received: by kanga.kvack.org (Postfix) id 7B0B16B005D; Wed, 7 Jul 2021 15:10:44 -0400 (EDT) Received: by kanga.kvack.org (Postfix, from userid 40) id 7891B6B0070; Wed, 7 Jul 2021 15:10:44 -0400 (EDT) X-Delivered-To: int-list-linux-mm@kvack.org Received: by kanga.kvack.org (Postfix, from userid 63042) id 5E6386B005D; Wed, 7 Jul 2021 15:10:44 -0400 (EDT) X-Delivered-To: linux-mm@kvack.org Received: from forelay.hostedemail.com (smtprelay0138.hostedemail.com [216.40.44.138]) by kanga.kvack.org (Postfix) with ESMTP id 3A3606B005D for ; Wed, 7 Jul 2021 15:10:44 -0400 (EDT) Received: from smtpin30.hostedemail.com (10.5.19.251.rfc1918.com [10.5.19.251]) by forelay05.hostedemail.com (Postfix) with ESMTP id 8B821180357F7 for ; Wed, 7 Jul 2021 19:10:43 +0000 (UTC) X-FDA: 78336733566.30.E69FAD6 Received: from NAM10-BN7-obe.outbound.protection.outlook.com (mail-bn7nam10on2043.outbound.protection.outlook.com [40.107.92.43]) by imf06.hostedemail.com (Postfix) with ESMTP id DA453801B0D6 for ; Wed, 7 Jul 2021 19:10:42 +0000 (UTC) ARC-Seal: i=1; a=rsa-sha256; s=arcselector9901; d=microsoft.com; cv=none; b=mu9jI3zup+V/l2W5k3oMTXYtsVdL2zpQMOMhffSi0FQEfKSPMiezhYxGB6X3N/ZPpFRypEFtf7TZVftMwihuqwYjVEBuXVITEibQkowx+NQ7Bicl8nmK2e+2MHs10aYsxtCPyeR9IIy7yU8CrQDj8Bg+JkRdvAgsDsrlZSvzOvcXrGXSIstRiAl5SZtfc7F/G/995/duR3fM0MZCfYMxY5O0N2RYaK5iIrba1JBZ11tGFf83k35zhmbbEow7YgszRnNFjybNed5cCdGnmdFPbIZXR9G2YUzFJVl42oI+upaoouglkKMiyEuomaffWgPeaeyyDvqFOWSdbRydqWOi2w== ARC-Message-Signature: i=1; a=rsa-sha256; c=relaxed/relaxed; d=microsoft.com; s=arcselector9901; h=From:Date:Subject:Message-ID:Content-Type:MIME-Version:X-MS-Exchange-SenderADCheck; bh=R5Cans74cvKPxP3ukIl1IfG8AoF89e0TKgk7qplJCnc=; b=isZzvjJUM4ih7i2TVsdgqEoiANCGdkm2VxLcD+6AJNu9dnXgGv+5FKBnSC+nzWzdfkUvrv494Me6phFrQvE7zlLcjO5ZecCEAi7opzs6/4gmnmB5Zes77wZVTV3qDKIeacA2h/fG0t3lEMQT1PZBbe35Oq4j1ArvMnNJ2swDjFZQZig55mgStwkSNVqe0DHqW/0iln/9TqvQIJNxTMef2IeYD6tkG91ci2z4sczbEEa8TCjmhfeyfhioohu72uz3C/Px/DRAUFJRfV2liDmB56v+M573RyFPSstGTR8rka2Q4k1tfEF9Vkou0zhsX9ixBWmrv1N6GLYw7tIxdb5axg== ARC-Authentication-Results: i=1; mx.microsoft.com 1; spf=pass smtp.mailfrom=amd.com; dmarc=pass action=none header.from=amd.com; dkim=pass header.d=amd.com; arc=none DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=amd.com; s=selector1; h=From:Date:Subject:Message-ID:Content-Type:MIME-Version:X-MS-Exchange-SenderADCheck; bh=R5Cans74cvKPxP3ukIl1IfG8AoF89e0TKgk7qplJCnc=; b=AV6WfwjDG0mN8Jz+zOzxt9wYt7X2uu2WLUsKeZXiHrPupDaLrzcMAWnQITfElO0ZJ2ol7ehb6C49NjCSQAnxxVhYaMka0AHQUQ4Elm3I1aw12zel7AGjYV8x3v78qjdjGQNKFe7uQ5pE/Mu/io/aRJP0TF/SbGG9uFiifR3khiM= Received: from BYAPR12MB2711.namprd12.prod.outlook.com (2603:10b6:a03:63::10) by BYAPR12MB2808.namprd12.prod.outlook.com (2603:10b6:a03:69::24) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.20.4287.26; Wed, 7 Jul 2021 18:37:44 +0000 Received: from BYAPR12MB2711.namprd12.prod.outlook.com ([fe80::40e3:aade:9549:4bed]) by BYAPR12MB2711.namprd12.prod.outlook.com ([fe80::40e3:aade:9549:4bed%7]) with mapi id 15.20.4287.033; Wed, 7 Jul 2021 18:37:44 +0000 From: Brijesh Singh To: x86@kernel.org, linux-kernel@vger.kernel.org, kvm@vger.kernel.org, linux-efi@vger.kernel.org, platform-driver-x86@vger.kernel.org, linux-coco@lists.linux.dev, linux-mm@kvack.org, linux-crypto@vger.kernel.org Cc: Thomas Gleixner , Ingo Molnar , Joerg Roedel , Tom Lendacky , "H. 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 19/40] crypto: ccp: provide APIs to query extended attestation report Date: Wed, 7 Jul 2021 13:35:55 -0500 Message-Id: <20210707183616.5620-20-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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dkim=pass header.d=amd.com header.s=selector1 header.b=AV6WfwjD; spf=pass (imf06.hostedemail.com: domain of brijesh.singh@amd.com designates 40.107.92.43 as permitted sender) smtp.mailfrom=brijesh.singh@amd.com; dmarc=pass (policy=quarantine) header.from=amd.com X-Rspamd-Server: rspam05 X-Stat-Signature: yf8pq9rj6xjcusbooj5s6bn19rzkg43a X-Rspamd-Queue-Id: DA453801B0D6 X-Rspam-User: nil X-HE-Tag: 1625685042-162958 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 1984a7b2c4e1..4cc9c1dff49f 100644 --- a/drivers/crypto/ccp/sev-dev.c +++ b/drivers/crypto/ccp/sev-dev.c @@ -22,6 +22,7 @@ #include #include #include +#include #include @@ -1616,6 +1617,48 @@ 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 we have 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 b72a74f6a4e9..2345ac6ae431 100644 --- a/include/linux/psp-sev.h +++ b/include/linux/psp-sev.h @@ -925,6 +925,23 @@ 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 @@ -972,6 +989,13 @@ 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__ */