From patchwork Mon Feb 20 18:38:25 2023 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Michael Roth X-Patchwork-Id: 13146955 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id C44BEC6379F for ; Mon, 20 Feb 2023 18:55:08 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S232764AbjBTSzH (ORCPT ); Mon, 20 Feb 2023 13:55:07 -0500 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:39110 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S232777AbjBTSyr (ORCPT ); Mon, 20 Feb 2023 13:54:47 -0500 Received: from NAM10-MW2-obe.outbound.protection.outlook.com (mail-mw2nam10on2060d.outbound.protection.outlook.com [IPv6:2a01:111:f400:7e89::60d]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 0D76FA5E9; Mon, 20 Feb 2023 10:54:19 -0800 (PST) ARC-Seal: i=1; a=rsa-sha256; s=arcselector9901; d=microsoft.com; cv=none; b=Bn0I8tRk74veKXoi+NS7P+CkSafrwCA2XaRi11ywb+SnDNqix4eGk4F2ywZm6gtME4/FnvBThtn+lp7eOjXhgbhZCKhstynzu0Ycgg6aqLNGlYgd/wPx3rVdv6UD+2LXj3KGaunsL9n3Q6i3o5pYWMj385PPJ8on1hYl6dbmYPyQPZX/nhwuqoJjRkj37fzBEcVXPAWZsk0P33+XzyHQsFBXXwHdOFHV+gZ6tEzOZRMT2H62zfpDEilGiCCPya8uOlMWSXv/N1+rr+3tRkFZwArIVpmCGnXjDDn3V20fM218XzGMgx6tT70+1LZ1qrqFWmX5dKBi+pivDB0ywnZsRA== 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-AntiSpam-MessageData-ChunkCount:X-MS-Exchange-AntiSpam-MessageData-0:X-MS-Exchange-AntiSpam-MessageData-1; bh=FB2N6JkgN/Cjkvv6VZ4HEN31LDCqlLOev6/9qU2o1SI=; b=bWXUgKZRDbxjKngBSfRT4scBV0OnIPLu2tGSjiMHG5HYD6ONnvEXAgsBFXkwktVHiL6S1Iy61svQVpI7BpqD0MHmnthuOynHfnmkDu+P8zFa+Tfdb+SDlNQmrQXOcPKcMe2WRg6OeOmau9AmpHCmFx3E6TsnW5NF419glNeXF6RH7BcLtzP4qphR9IC5Dax89XcSyhkALU6H39ipEcvxUthz0mToGmJ5NJzmz35+68KGL1rqUrxe7HweSwqsv3j78YaoSYQcvmbxCK3Mc/W5OJlGGxeso1UfNzSj4L4OZWOPQDHYH9yX4t4u7E6CE/y8JcLPQo/inVeTXblaTS0PWA== ARC-Authentication-Results: i=1; mx.microsoft.com 1; spf=pass (sender ip is 165.204.84.17) smtp.rcpttodomain=vger.kernel.org smtp.mailfrom=amd.com; dmarc=pass (p=quarantine sp=quarantine pct=100) action=none header.from=amd.com; dkim=none (message not signed); 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=FB2N6JkgN/Cjkvv6VZ4HEN31LDCqlLOev6/9qU2o1SI=; b=zY/3TP1PUkR8zHnjqGaKe3E3sE8nj8Cm9Mmc5LASblRG4RDEtxPUFfAhS9z5an3P7F36lM5jZpgdFbfscQXNVqYomIa/TGaH3kXcmjVwFlNpvTdVGHt+9pOKYjt+xgH599RnZ4vQ1HwoqCfgLZXr8yvXVCOsm/aCO4h8HnTvLvA= Received: from DM6PR21CA0024.namprd21.prod.outlook.com (2603:10b6:5:174::34) by DS0PR12MB6557.namprd12.prod.outlook.com (2603:10b6:8:d3::5) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.20.6111.19; Mon, 20 Feb 2023 18:52:59 +0000 Received: from DM6NAM11FT027.eop-nam11.prod.protection.outlook.com (2603:10b6:5:174:cafe::72) by DM6PR21CA0024.outlook.office365.com (2603:10b6:5:174::34) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.20.6134.6 via Frontend Transport; Mon, 20 Feb 2023 18:52:59 +0000 X-MS-Exchange-Authentication-Results: spf=pass (sender IP is 165.204.84.17) smtp.mailfrom=amd.com; dkim=none (message not signed) header.d=none;dmarc=pass action=none header.from=amd.com; Received-SPF: Pass (protection.outlook.com: domain of amd.com designates 165.204.84.17 as permitted sender) receiver=protection.outlook.com; client-ip=165.204.84.17; helo=SATLEXMB04.amd.com; pr=C Received: from SATLEXMB04.amd.com (165.204.84.17) by DM6NAM11FT027.mail.protection.outlook.com (10.13.172.205) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_128_GCM_SHA256) id 15.20.6111.21 via Frontend Transport; Mon, 20 Feb 2023 18:52:59 +0000 Received: from localhost (10.180.168.240) by SATLEXMB04.amd.com (10.181.40.145) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_128_GCM_SHA256) id 15.1.2375.34; Mon, 20 Feb 2023 12:52:58 -0600 From: Michael Roth To: CC: , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , Brijesh Singh Subject: [PATCH RFC v8 34/56] KVM: SVM: Add KVM_SEV_SNP_LAUNCH_START command Date: Mon, 20 Feb 2023 12:38:25 -0600 Message-ID: <20230220183847.59159-35-michael.roth@amd.com> X-Mailer: git-send-email 2.25.1 In-Reply-To: <20230220183847.59159-1-michael.roth@amd.com> References: <20230220183847.59159-1-michael.roth@amd.com> MIME-Version: 1.0 X-Originating-IP: [10.180.168.240] X-ClientProxiedBy: SATLEXMB03.amd.com (10.181.40.144) To SATLEXMB04.amd.com (10.181.40.145) X-EOPAttributedMessage: 0 X-MS-PublicTrafficType: Email X-MS-TrafficTypeDiagnostic: DM6NAM11FT027:EE_|DS0PR12MB6557:EE_ X-MS-Office365-Filtering-Correlation-Id: b1cec592-d609-42e5-1671-08db1373afc0 X-MS-Exchange-SenderADCheck: 1 X-MS-Exchange-AntiSpam-Relay: 0 X-Microsoft-Antispam: BCL:0; X-Microsoft-Antispam-Message-Info: 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 X-Forefront-Antispam-Report: CIP:165.204.84.17;CTRY:US;LANG:en;SCL:1;SRV:;IPV:CAL;SFV:NSPM;H:SATLEXMB04.amd.com;PTR:InfoDomainNonexistent;CAT:NONE;SFS:(13230025)(4636009)(136003)(396003)(346002)(376002)(39860400002)(451199018)(36840700001)(46966006)(40470700004)(1076003)(41300700001)(4326008)(40480700001)(6916009)(8676002)(70586007)(70206006)(8936002)(5660300002)(7406005)(7416002)(83380400001)(2616005)(26005)(186003)(16526019)(6666004)(36756003)(54906003)(336012)(478600001)(47076005)(40460700003)(426003)(356005)(316002)(44832011)(86362001)(82740400003)(81166007)(82310400005)(36860700001)(2906002)(36900700001);DIR:OUT;SFP:1101; X-OriginatorOrg: amd.com X-MS-Exchange-CrossTenant-OriginalArrivalTime: 20 Feb 2023 18:52:59.2887 (UTC) X-MS-Exchange-CrossTenant-Network-Message-Id: b1cec592-d609-42e5-1671-08db1373afc0 X-MS-Exchange-CrossTenant-Id: 3dd8961f-e488-4e60-8e11-a82d994e183d X-MS-Exchange-CrossTenant-OriginalAttributedTenantConnectingIp: TenantId=3dd8961f-e488-4e60-8e11-a82d994e183d;Ip=[165.204.84.17];Helo=[SATLEXMB04.amd.com] X-MS-Exchange-CrossTenant-AuthSource: DM6NAM11FT027.eop-nam11.prod.protection.outlook.com X-MS-Exchange-CrossTenant-AuthAs: Anonymous X-MS-Exchange-CrossTenant-FromEntityHeader: HybridOnPrem X-MS-Exchange-Transport-CrossTenantHeadersStamped: DS0PR12MB6557 Precedence: bulk List-ID: X-Mailing-List: kvm@vger.kernel.org From: Brijesh Singh KVM_SEV_SNP_LAUNCH_START begins the launch process for an SEV-SNP guest. The command initializes a cryptographic digest context used to construct the measurement of the guest. If the guest is expected to be migrated, the command also binds a migration agent (MA) to the guest. For more information see the SEV-SNP specification. Signed-off-by: Brijesh Singh Signed-off-by: Ashish Kalra Signed-off-by: Michael Roth --- .../virt/kvm/x86/amd-memory-encryption.rst | 24 ++++ arch/x86/kvm/svm/sev.c | 121 +++++++++++++++++- arch/x86/kvm/svm/svm.h | 1 + include/uapi/linux/kvm.h | 10 ++ 4 files changed, 153 insertions(+), 3 deletions(-) diff --git a/Documentation/virt/kvm/x86/amd-memory-encryption.rst b/Documentation/virt/kvm/x86/amd-memory-encryption.rst index 2432213bd0ea..58971fc02a15 100644 --- a/Documentation/virt/kvm/x86/amd-memory-encryption.rst +++ b/Documentation/virt/kvm/x86/amd-memory-encryption.rst @@ -461,6 +461,30 @@ The flags bitmap is defined as:: If the specified flags is not supported then return -EOPNOTSUPP, and the supported flags are returned. +19. KVM_SNP_LAUNCH_START +------------------------ + +The KVM_SNP_LAUNCH_START command is used for creating the memory encryption +context for the SEV-SNP guest. To create the encryption context, user must +provide a guest policy, migration agent (if any) and guest OS visible +workarounds value as defined SEV-SNP specification. + +Parameters (in): struct kvm_snp_launch_start + +Returns: 0 on success, -negative on error + +:: + + struct kvm_sev_snp_launch_start { + __u64 policy; /* Guest policy to use. */ + __u64 ma_uaddr; /* userspace address of migration agent */ + __u8 ma_en; /* 1 if the migration agent is enabled */ + __u8 imi_en; /* set IMI to 1. */ + __u8 gosvw[16]; /* guest OS visible workarounds */ + }; + +See the SEV-SNP specification for further detail on the launch input. + References ========== diff --git a/arch/x86/kvm/svm/sev.c b/arch/x86/kvm/svm/sev.c index a8efe1f6bf77..097bb2138360 100644 --- a/arch/x86/kvm/svm/sev.c +++ b/arch/x86/kvm/svm/sev.c @@ -22,6 +22,7 @@ #include #include #include +#include #include "mmu.h" #include "x86.h" @@ -75,6 +76,8 @@ static unsigned int nr_asids; static unsigned long *sev_asid_bitmap; static unsigned long *sev_reclaim_asid_bitmap; +static int snp_decommission_context(struct kvm *kvm); + struct enc_region { struct list_head list; unsigned long npages; @@ -100,12 +103,17 @@ static int sev_flush_asids(int min_asid, int max_asid) down_write(&sev_deactivate_lock); wbinvd_on_all_cpus(); - ret = sev_guest_df_flush(&error); + + if (sev_snp_enabled) + ret = sev_do_cmd(SEV_CMD_SNP_DF_FLUSH, NULL, &error); + else + ret = sev_guest_df_flush(&error); up_write(&sev_deactivate_lock); if (ret) - pr_err("SEV: DF_FLUSH failed, ret=%d, error=%#x\n", ret, error); + pr_err("SEV%s: DF_FLUSH failed, ret=%d, error=%#x\n", + sev_snp_enabled ? "-SNP" : "", ret, error); return ret; } @@ -2011,6 +2019,80 @@ int sev_vm_move_enc_context_from(struct kvm *kvm, unsigned int source_fd) return ret; } +/* + * The guest context contains all the information, keys and metadata + * associated with the guest that the firmware tracks to implement SEV + * and SNP features. The firmware stores the guest context in hypervisor + * provide page via the SNP_GCTX_CREATE command. + */ +static void *snp_context_create(struct kvm *kvm, struct kvm_sev_cmd *argp) +{ + struct sev_data_snp_addr data = {}; + void *context; + int rc; + + /* Allocate memory for context page */ + context = snp_alloc_firmware_page(GFP_KERNEL_ACCOUNT); + if (!context) + return NULL; + + data.gctx_paddr = __psp_pa(context); + rc = __sev_issue_cmd(argp->sev_fd, SEV_CMD_SNP_GCTX_CREATE, &data, &argp->error); + if (rc) { + snp_free_firmware_page(context); + return NULL; + } + + return context; +} + +static int snp_bind_asid(struct kvm *kvm, int *error) +{ + struct kvm_sev_info *sev = &to_kvm_svm(kvm)->sev_info; + struct sev_data_snp_activate data = {0}; + + data.gctx_paddr = __psp_pa(sev->snp_context); + data.asid = sev_get_asid(kvm); + return sev_issue_cmd(kvm, SEV_CMD_SNP_ACTIVATE, &data, error); +} + +static int snp_launch_start(struct kvm *kvm, struct kvm_sev_cmd *argp) +{ + struct kvm_sev_info *sev = &to_kvm_svm(kvm)->sev_info; + struct sev_data_snp_launch_start start = {0}; + struct kvm_sev_snp_launch_start params; + int rc; + + if (!sev_snp_guest(kvm)) + return -ENOTTY; + + if (copy_from_user(¶ms, (void __user *)(uintptr_t)argp->data, sizeof(params))) + return -EFAULT; + + sev->snp_context = snp_context_create(kvm, argp); + if (!sev->snp_context) + return -ENOTTY; + + start.gctx_paddr = __psp_pa(sev->snp_context); + start.policy = params.policy; + memcpy(start.gosvw, params.gosvw, sizeof(params.gosvw)); + rc = __sev_issue_cmd(argp->sev_fd, SEV_CMD_SNP_LAUNCH_START, &start, &argp->error); + if (rc) + goto e_free_context; + + sev->fd = argp->sev_fd; + rc = snp_bind_asid(kvm, &argp->error); + if (rc) + goto e_free_context; + + return 0; + +e_free_context: + snp_decommission_context(kvm); + + return rc; +} + int sev_mem_enc_ioctl(struct kvm *kvm, void __user *argp) { struct kvm_sev_cmd sev_cmd; @@ -2101,6 +2183,9 @@ int sev_mem_enc_ioctl(struct kvm *kvm, void __user *argp) case KVM_SEV_RECEIVE_FINISH: r = sev_receive_finish(kvm, &sev_cmd); break; + case KVM_SEV_SNP_LAUNCH_START: + r = snp_launch_start(kvm, &sev_cmd); + break; default: r = -EINVAL; goto out; @@ -2292,6 +2377,28 @@ int sev_vm_copy_enc_context_from(struct kvm *kvm, unsigned int source_fd) return ret; } +static int snp_decommission_context(struct kvm *kvm) +{ + struct kvm_sev_info *sev = &to_kvm_svm(kvm)->sev_info; + struct sev_data_snp_addr data = {}; + int ret; + + /* If context is not created then do nothing */ + if (!sev->snp_context) + return 0; + + data.gctx_paddr = __sme_pa(sev->snp_context); + ret = sev_do_cmd(SEV_CMD_SNP_DECOMMISSION, &data, NULL); + if (WARN_ONCE(ret, "failed to release guest context")) + return ret; + + /* free the context page now */ + snp_free_firmware_page(sev->snp_context); + sev->snp_context = NULL; + + return 0; +} + void sev_vm_destroy(struct kvm *kvm) { struct kvm_sev_info *sev = &to_kvm_svm(kvm)->sev_info; @@ -2333,7 +2440,15 @@ void sev_vm_destroy(struct kvm *kvm) } } - sev_unbind_asid(kvm, sev->handle); + if (sev_snp_guest(kvm)) { + if (snp_decommission_context(kvm)) { + WARN_ONCE(1, "Failed to free SNP guest context, leaking asid!\n"); + return; + } + } else { + sev_unbind_asid(kvm, sev->handle); + } + sev_asid_free(sev); } diff --git a/arch/x86/kvm/svm/svm.h b/arch/x86/kvm/svm/svm.h index 56a5c96d8a36..740969b57425 100644 --- a/arch/x86/kvm/svm/svm.h +++ b/arch/x86/kvm/svm/svm.h @@ -92,6 +92,7 @@ struct kvm_sev_info { struct misc_cg *misc_cg; /* For misc cgroup accounting */ atomic_t migration_in_progress; u64 snp_init_flags; + void *snp_context; /* SNP guest context page */ }; struct kvm_svm { diff --git a/include/uapi/linux/kvm.h b/include/uapi/linux/kvm.h index 499cc323f793..cf19799ca5ce 100644 --- a/include/uapi/linux/kvm.h +++ b/include/uapi/linux/kvm.h @@ -1919,6 +1919,7 @@ enum sev_cmd_id { /* SNP specific commands */ KVM_SEV_SNP_INIT, + KVM_SEV_SNP_LAUNCH_START, KVM_SEV_NR_MAX, }; @@ -2026,6 +2027,15 @@ struct kvm_snp_init { __u64 flags; }; +struct kvm_sev_snp_launch_start { + __u64 policy; + __u64 ma_uaddr; + __u8 ma_en; + __u8 imi_en; + __u8 gosvw[16]; + __u8 pad[6]; +}; + #define KVM_DEV_ASSIGN_ENABLE_IOMMU (1 << 0) #define KVM_DEV_ASSIGN_PCI_2_3 (1 << 1) #define KVM_DEV_ASSIGN_MASK_INTX (1 << 2)