From patchwork Wed Mar 24 17:04:18 2021 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Brijesh Singh X-Patchwork-Id: 408317 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, URIBL_BLOCKED, USER_AGENT_GIT autolearn=ham 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 5CB06C433FC for ; Wed, 24 Mar 2021 17:05:58 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 159D461A16 for ; Wed, 24 Mar 2021 17:05:58 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S237141AbhCXRF3 (ORCPT ); Wed, 24 Mar 2021 13:05:29 -0400 Received: from mail-bn8nam11on2064.outbound.protection.outlook.com ([40.107.236.64]:50400 "EHLO NAM11-BN8-obe.outbound.protection.outlook.com" rhost-flags-OK-OK-OK-FAIL) by vger.kernel.org with ESMTP id S237048AbhCXRFE (ORCPT ); Wed, 24 Mar 2021 13:05:04 -0400 ARC-Seal: i=1; a=rsa-sha256; s=arcselector9901; d=microsoft.com; cv=none; b=n4xe+Dc7SJ189w66rF26UMtNRjAGOLH+ilGNzPKINKKBKagQHPlEusJBOaZcLLlT/l6xFWql+DcAwLzs14zpsRLBoshEyxdc7Jv6/xUYWjHK3+A33SAu36OGL9e2x5BKj9YR2r95ADXPbeaKvbdQPY2nQ4NU1bp4jwzT5uS8HZUlJRXOv9Z9EE6GufzuaV2lo0ukYb++dYJzp7K8orp9s8eUNG9evRtEa30wwA/3IkZVjMSPyn/3Cd3qwQCZ7YS2IWJ9eLbzNEFhmn21PltphRsgz4OaaNuKJNryMj7bWeUlC7QZyXM71R4j/O7l7HbcO8PouDABWBRNU1T8CVOfOw== 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=USWAPSDrkPixl8ICG9MoZEp/4U9M7ze9vOMJuwexQAk=; b=QYfnxJNLX4pZRArzkj8luTONtfNNdUbFbqQqTZFjh7PlJnQAhrZsynVKxxbWHhi1KeGd8MeBtRnGzfcJ2r4E4/sZ4VOquWVwctBzeO4S2aXCzqk3/mcFgmZ+D9olZSKvPkmwhnWZ6UspfncJa7iOdrt5VzzuE+A3JoAvCpWvJtWV8Dr2Y+FGeqaYaj2QA5fyPCr4N+vyU+2j7hgjxSgg64l6SZLLcjnHqM0NhWbXL3MXO2JGgtRdsehgMsSfL84Olc+OPxvExPnI5jzhGM5vMouWHjQIm3ud2aBf2CbcPEXl57VvmhP8DgO+IiWPcf55FrWMfi8Rr0Kzr5j5d+Ft3A== 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=USWAPSDrkPixl8ICG9MoZEp/4U9M7ze9vOMJuwexQAk=; b=T4srTx+VBFok1WZsDzEsQsl8mLYxUhawPHJ2rgLRMmknn2d5nZMkv+p7/sfiQi2UVQ+/SJKbm6z4q4j0fEA6FyMul/UwN2jbTn2Q5iJ4ArhoaysAVylkT70othuxoDdcZ9JqhuEUitzrHei7V2g+12ADjL0B3CQcBDGTS5OoVdY= Authentication-Results: vger.kernel.org; dkim=none (message not signed) header.d=none; vger.kernel.org; dmarc=none action=none header.from=amd.com; Received: from SN6PR12MB2718.namprd12.prod.outlook.com (2603:10b6:805:6f::22) by SA0PR12MB4557.namprd12.prod.outlook.com (2603:10b6:806:9d::10) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.20.3977.24; Wed, 24 Mar 2021 17:05:00 +0000 Received: from SN6PR12MB2718.namprd12.prod.outlook.com ([fe80::30fb:2d6c:a0bf:2f1d]) by SN6PR12MB2718.namprd12.prod.outlook.com ([fe80::30fb:2d6c:a0bf:2f1d%3]) with mapi id 15.20.3955.027; Wed, 24 Mar 2021 17:05:00 +0000 From: Brijesh Singh To: linux-kernel@vger.kernel.org, x86@kernel.org, kvm@vger.kernel.org, linux-crypto@vger.kernel.org Cc: ak@linux.intel.com, herbert@gondor.apana.org.au, Brijesh Singh , Thomas Gleixner , Ingo Molnar , Borislav Petkov , Joerg Roedel , "H. Peter Anvin" , Tony Luck , Dave Hansen , "Peter Zijlstra (Intel)" , Paolo Bonzini , Tom Lendacky , David Rientjes , Sean Christopherson Subject: [RFC Part2 PATCH 12/30] crypto ccp: handle the legacy SEV command when SNP is enabled Date: Wed, 24 Mar 2021 12:04:18 -0500 Message-Id: <20210324170436.31843-13-brijesh.singh@amd.com> X-Mailer: git-send-email 2.17.1 In-Reply-To: <20210324170436.31843-1-brijesh.singh@amd.com> References: <20210324170436.31843-1-brijesh.singh@amd.com> X-Originating-IP: [165.204.77.1] X-ClientProxiedBy: SA0PR11CA0210.namprd11.prod.outlook.com (2603:10b6:806:1bc::35) 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 SA0PR11CA0210.namprd11.prod.outlook.com (2603:10b6:806:1bc::35) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.20.3977.25 via Frontend Transport; Wed, 24 Mar 2021 17:04:59 +0000 X-MS-PublicTrafficType: Email X-MS-Office365-Filtering-HT: Tenant X-MS-Office365-Filtering-Correlation-Id: 769d9387-8c4a-4d26-3a8c-08d8eee6f596 X-MS-TrafficTypeDiagnostic: SA0PR12MB4557: X-MS-Exchange-Transport-Forked: True X-Microsoft-Antispam-PRVS: X-MS-Oob-TLC-OOBClassifiers: OLM:1850; X-MS-Exchange-SenderADCheck: 1 X-Microsoft-Antispam: BCL:0; X-Microsoft-Antispam-Message-Info: R0qR1apenws3tPrJDfOih5Y2NOUQUV5jRerbZhdPAEJ8BfnCjNZ2bwLhBdCG+ldzjqzCYh6X4+TxQYGBsw9o0HZsN7n8SM67O6flyePiUzSYHj1L4Ue/rcDMWbchNoMzhkpGs5r2SS8YU9/HQgGhcKMzW7RHrZMDXcx9610w+s6ixlM12cnsIm0Momv51Xc8ntcl4/42cUuNkk81ZXgWMkjQumT+1ae5rkLF5zEKcyQQTZs000DSugg7Nlom4GPt96oqe6gdQSWRfk4J5i7RRcMAgP6j9JgSMZkXpqBGa4J2zZh3RQWTFacp6g94OEXQxojcLH3hituSFWoVbz9g0EY7mjEbz5xj68ElIrML40jdURAf/GyowrzlUQHhF15GBhSwqarNCl+H9himvnZ4UdFjjOItv6fBwfAqJrwSla/L49gwiNjhUzBW+MRjaBPVU31BP1K3vMuATTjn/acNLf5xuPOiILujUEgiRuGmxYfHPNdxLqMv7gWH0a/uKGaWGTa4ITqGPips5AKShVeX6kD6Qr04+hdyvLStvGNteJCteHr4kAlZuh1bziFBKnkFaRtX2XXFyFN7/BXt4J/RoqPWeEs77zNFYsXQeZF7awpsyH/vjpoBIrYx3fAHPgd6SF999X6Con/d2hPIMOJObjOqd/3CjQ/aAKAlBVzD7VGjPgiWwEw7g3Ra1OOs7stM X-Forefront-Antispam-Report: CIP:255.255.255.255; CTRY:; LANG:en; SCL:1; SRV:; IPV:NLI; SFV:NSPM; H:SN6PR12MB2718.namprd12.prod.outlook.com; PTR:; CAT:NONE; SFS:(4636009)(366004)(376002)(396003)(346002)(136003)(39860400002)(86362001)(54906003)(186003)(44832011)(6666004)(4326008)(38100700001)(26005)(316002)(66476007)(8676002)(16526019)(1076003)(2616005)(83380400001)(5660300002)(6486002)(956004)(52116002)(8936002)(478600001)(7416002)(7696005)(66556008)(36756003)(66946007)(2906002)(71600200004); DIR:OUT; SFP:1101; X-MS-Exchange-AntiSpam-MessageData: Rw2ZGcgxs5MUidHwH/nhYnPN+pcVjaYDU2KatjcYkBwxmT0qG2QbcChVY6vmNbrdPNAns+tCMAPS9gm0Sw2oUXvjAg+q0JBWLMQpSX3plhWSIKdnoiAGYXxjNkw02pW1bWUTb9wXCP3aLQ8gopI8U3d7TINpwubq5Ky9GpmQClRdWkYeYe4id6WsQLd8acDH0d0ncTtn4TVfow/B56+Qgw6n+EuOCn0n2AJ2TyFKtPMGQQCcWQcUVBlYaW7sCpNsjvXlpZvTU9DdX/LKXWlckerxHY+1MbbyMHDCEvfJOMPSgW4BqaVC4Nc43CIVCeXTHJDPaAJ1x+QjXk2Nv6h2UWn10zGsu5mDaWt+CM+9cm3yvMEkOSkfN4mLG4PoMP2zFLsvkZ4W/OTNWN+kT0VFqJUzmtNjnltiCDiD4esAdXwAhck6jLorRqpXVWYfDrqDLBjVIlgcub994u3xVHfzOcRk2qc1dBFXJYEdF4tah1uRvz1MXdNR8RqqcOejhyoW3XZ+bdIAVd66EPS+sJT5JqBkfk2H0bV1rgYLaJt562+hE7/dy+2+PbTYGug/PWuaR70ekqH4GI6Glm2xtSswLxe5UMEEDMW+dReFSXJUOl/7yCXXrpY8NkEx09zGe+kN77M1JLPU4dAvUfe8B6/Yn6LdxZSzLdhMZOET1Z01jlnzl7ewZO/CuNsfv12aYaH8fhAQoQMmhOmyj8J0HoBqFi1cMxK+74JVUMIPO+GD5LFhA5bpFPm5AYKmSak6Ijcvxgbbo5PonoBn/nZDrMg2/88FhCdGE/4OVc9Nk7wxkwvc/dI3RfRmEC1ZVf+ukPkaG+dOKIyVD0OgqTlfPXFsjZy+5gThB8D67dqK8DAuY+idBbGCPw6Jn6V0Gz0jZZvQavFNbqFxPsY48XyDCcp8RnP8zg5dA99Tgj7VZpJHVFMpzG/EeI36phk3KZke8WIeHDz0cKGxvcbQKq7xt+PG/b7aedK4zIIVCxgY/jwm4Ql7zq7oA1zLhzeCoIjdlvQ9SdrqyrTBHs/LUgNEDPaP8Gx/M5NV8z9apHBYhurmwyJ46gMosXlXFmZWdjMJiXidSkLX7NuDVbsBnOvyfrZGMFF3Q46W47uxnBQ5PggmI9VtP6Y/0Of6lkM0u4FL94Y62G2aM2MW2ZaLAl6fFt8ceKxppAZkWCE6xOHXUCYcJ5boON0j1tAfm7hg4qwdaD0O2isUUEPu2xIIWcNLACOzKSRCo4WBQ6wdB/FZhpr/3FHa/J22kIaJ33SGJsUpcH4sJbA8hE6QEoasxxkMn2dvI0Q6++nlo4hx91B5YkzQDSw9zzzsYwqSvAh4bN5+TBsr X-OriginatorOrg: amd.com X-MS-Exchange-CrossTenant-Network-Message-Id: 769d9387-8c4a-4d26-3a8c-08d8eee6f596 X-MS-Exchange-CrossTenant-AuthSource: SN6PR12MB2718.namprd12.prod.outlook.com X-MS-Exchange-CrossTenant-AuthAs: Internal X-MS-Exchange-CrossTenant-OriginalArrivalTime: 24 Mar 2021 17:05:00.4406 (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: QRFz+srWdYmcp4RZIm7z4aCxUY3Pv+/JB48Dx9s9xvX6ZaXj6adSQk8Lmu/1Z7nEIvJheAH4duDcT0jQb7UpJQ== X-MS-Exchange-Transport-CrossTenantHeadersStamped: SA0PR12MB4557 Precedence: bulk List-ID: X-Mailing-List: linux-crypto@vger.kernel.org The behavior of the SEV-legacy commands is altered when the SNP firmware is in the INIT state. When SNP is in INIT state, all the SEV-legacy commands that cause the firmware to write to memory must be in the firmware state before issuing the command.. See SEV-SNP spec section 5.3.7 for more detail. Cc: Thomas Gleixner Cc: Ingo Molnar Cc: Borislav Petkov Cc: Joerg Roedel Cc: "H. Peter Anvin" Cc: Tony Luck Cc: Dave Hansen Cc: "Peter Zijlstra (Intel)" Cc: Paolo Bonzini Cc: Tom Lendacky Cc: David Rientjes Cc: Sean Christopherson Cc: x86@kernel.org Cc: kvm@vger.kernel.org Signed-off-by: Brijesh Singh --- drivers/crypto/ccp/sev-dev.c | 90 +++++++++++++++++++++++++++++++++--- drivers/crypto/ccp/sev-dev.h | 1 + 2 files changed, 85 insertions(+), 6 deletions(-) diff --git a/drivers/crypto/ccp/sev-dev.c b/drivers/crypto/ccp/sev-dev.c index 242c4775eb56..4aa9d4505d71 100644 --- a/drivers/crypto/ccp/sev-dev.c +++ b/drivers/crypto/ccp/sev-dev.c @@ -148,12 +148,35 @@ static int sev_cmd_buffer_len(int cmd) return 0; } +static bool sev_legacy_cmd_buf_writable(int cmd) +{ + switch (cmd) { + case SEV_CMD_PLATFORM_STATUS: + case SEV_CMD_GUEST_STATUS: + case SEV_CMD_LAUNCH_START: + case SEV_CMD_RECEIVE_START: + case SEV_CMD_LAUNCH_MEASURE: + case SEV_CMD_SEND_START: + case SEV_CMD_SEND_UPDATE_DATA: + case SEV_CMD_SEND_UPDATE_VMSA: + case SEV_CMD_PEK_CSR: + case SEV_CMD_PDH_CERT_EXPORT: + case SEV_CMD_GET_ID: + return true; + default: + return false; + } +} + static int __sev_do_cmd_locked(int cmd, void *data, int *psp_ret) { + size_t cmd_buf_len = sev_cmd_buffer_len(cmd); struct psp_device *psp = psp_master; struct sev_device *sev; unsigned int phys_lsb, phys_msb; unsigned int reg, ret = 0; + struct page *cmd_page = NULL; + struct rmpupdate e = {}; if (!psp || !psp->sev_data) return -ENODEV; @@ -163,15 +186,47 @@ static int __sev_do_cmd_locked(int cmd, void *data, int *psp_ret) sev = psp->sev_data; + /* + * Check If SNP is initialized and we are asked to execute a legacy + * command that requires write by the firmware in the command buffer. + * In that case use an intermediate command buffer page to complete the + * operation. + * + * NOTE: If the command buffer contains a pointer which will be modified + * by the firmware then caller must take care of it. + */ + if (sev->snp_inited && sev_legacy_cmd_buf_writable(cmd)) { + cmd_page = alloc_page(GFP_KERNEL_ACCOUNT | __GFP_ZERO); + if (!cmd_page) + return -ENOMEM; + + memcpy(page_address(cmd_page), data, cmd_buf_len); + + /* make it as a firmware page */ + e.immutable = true; + e.assigned = true; + ret = rmptable_rmpupdate(cmd_page, &e); + if (ret) { + dev_err(sev->dev, "sev cmd id %#x, failed to change to firmware state (spa 0x%lx ret %d).\n", + cmd, page_to_pfn(cmd_page) << PAGE_SHIFT, ret); + goto e_free; + } + } + /* Get the physical address of the command buffer */ - phys_lsb = data ? lower_32_bits(__psp_pa(data)) : 0; - phys_msb = data ? upper_32_bits(__psp_pa(data)) : 0; + if (cmd_page) { + phys_lsb = data ? lower_32_bits(__sme_page_pa(cmd_page)) : 0; + phys_msb = data ? upper_32_bits(__sme_page_pa(cmd_page)) : 0; + } else { + phys_lsb = data ? lower_32_bits(__psp_pa(data)) : 0; + phys_msb = data ? upper_32_bits(__psp_pa(data)) : 0; + } dev_dbg(sev->dev, "sev command id %#x buffer 0x%08x%08x timeout %us\n", cmd, phys_msb, phys_lsb, psp_timeout); print_hex_dump_debug("(in): ", DUMP_PREFIX_OFFSET, 16, 2, data, - sev_cmd_buffer_len(cmd), false); + cmd_buf_len, false); iowrite32(phys_lsb, sev->io_regs + sev->vdata->cmdbuff_addr_lo_reg); iowrite32(phys_msb, sev->io_regs + sev->vdata->cmdbuff_addr_hi_reg); @@ -185,6 +240,24 @@ static int __sev_do_cmd_locked(int cmd, void *data, int *psp_ret) /* wait for command completion */ ret = sev_wait_cmd_ioc(sev, ®, psp_timeout); + + /* if an intermediate page is used then copy the data back to original. */ + if (cmd_page) { + int rc; + + /* make it as a hypervisor page */ + memset(&e, 0, sizeof(struct rmpupdate)); + rc = rmptable_rmpupdate(cmd_page, &e); + if (rc) { + dev_err(sev->dev, "sev cmd id %#x, failed to change to hypervisor state ret=%d.\n", + cmd, rc); + /* Set the command page to NULL so that the page is leaked. */ + cmd_page = NULL; + } else { + memcpy(data, page_address(cmd_page), cmd_buf_len); + } + } + if (ret) { if (psp_ret) *psp_ret = 0; @@ -192,7 +265,7 @@ static int __sev_do_cmd_locked(int cmd, void *data, int *psp_ret) dev_err(sev->dev, "sev command %#x timed out, disabling PSP\n", cmd); psp_dead = true; - return ret; + goto e_free; } psp_timeout = psp_cmd_timeout; @@ -207,8 +280,11 @@ static int __sev_do_cmd_locked(int cmd, void *data, int *psp_ret) } print_hex_dump_debug("(out): ", DUMP_PREFIX_OFFSET, 16, 2, data, - sev_cmd_buffer_len(cmd), false); + cmd_buf_len, false); +e_free: + if (cmd_page) + __free_page(cmd_page); return ret; } @@ -234,7 +310,7 @@ static int __sev_platform_init_locked(int *error) sev = psp->sev_data; - if (sev->state == SEV_STATE_INIT) + if (sev->legacy_inited && (sev->state == SEV_STATE_INIT)) return 0; if (sev_es_tmr) { @@ -255,6 +331,7 @@ static int __sev_platform_init_locked(int *error) if (rc) return rc; + sev->legacy_inited = true; sev->state = SEV_STATE_INIT; /* Prepare for first SEV guest launch after INIT */ @@ -289,6 +366,7 @@ static int __sev_platform_shutdown_locked(int *error) if (ret) return ret; + sev->legacy_inited = false; sev->state = SEV_STATE_UNINIT; dev_dbg(sev->dev, "SEV firmware shutdown\n"); diff --git a/drivers/crypto/ccp/sev-dev.h b/drivers/crypto/ccp/sev-dev.h index 18b116a817ff..2ee9665a901d 100644 --- a/drivers/crypto/ccp/sev-dev.h +++ b/drivers/crypto/ccp/sev-dev.h @@ -54,6 +54,7 @@ struct sev_device { u8 build; bool snp_inited; + bool legacy_inited; }; int sev_dev_init(struct psp_device *psp);