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CTRY:US; LANG:en; SCL:1; SRV:; IPV:CAL; SFV:NSPM; H:SATLEXMB04.amd.com; PTR:InfoDomainNonexistent; CAT:NONE; SFS:(13230040)(376014)(36860700013)(82310400026)(1800799024)(7416014); DIR:OUT; SFP:1101; X-OriginatorOrg: amd.com X-MS-Exchange-CrossTenant-OriginalArrivalTime: 17 Sep 2024 20:16:20.7967 (UTC) X-MS-Exchange-CrossTenant-Network-Message-Id: fe388317-fc21-4321-ce31-08dcd7559873 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: SJ5PEPF00000205.namprd05.prod.outlook.com X-MS-Exchange-CrossTenant-AuthAs: Anonymous X-MS-Exchange-CrossTenant-FromEntityHeader: HybridOnPrem X-MS-Exchange-Transport-CrossTenantHeadersStamped: CH3PR12MB8481 From: Ashish Kalra Define new bit-field definitions returned by SNP_PLATFORM_STATUS command such as new capabilities like SNP_FEATURE_INFO command availability, ciphertext hiding enabled and capability. Signed-off-by: Ashish Kalra Reviewed-by: Tom Lendacky --- include/uapi/linux/psp-sev.h | 10 +++++++++- 1 file changed, 9 insertions(+), 1 deletion(-) diff --git a/include/uapi/linux/psp-sev.h b/include/uapi/linux/psp-sev.h index 832c15d9155b..dd7298b67b37 100644 --- a/include/uapi/linux/psp-sev.h +++ b/include/uapi/linux/psp-sev.h @@ -178,6 +178,10 @@ struct sev_user_data_get_id2 { * @mask_chip_id: whether chip id is present in attestation reports or not * @mask_chip_key: whether attestation reports are signed or not * @vlek_en: VLEK (Version Loaded Endorsement Key) hashstick is loaded + * @feature_info: whether SNP_FEATURE_INFO command is available + * @rapl_dis: whether RAPL is disabled + * @ciphertext_hiding_cap: whether platform has ciphertext hiding capability + * @ciphertext_hiding_en: whether ciphertext hiding is enabled * @rsvd1: reserved * @guest_count: the number of guest currently managed by the firmware * @current_tcb_version: current TCB version @@ -193,7 +197,11 @@ struct sev_user_data_snp_status { __u32 mask_chip_id:1; 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CTRY:US; LANG:en; SCL:1; SRV:; IPV:CAL; SFV:NSPM; H:SATLEXMB04.amd.com; PTR:InfoDomainNonexistent; CAT:NONE; SFS:(13230040)(1800799024)(7416014)(82310400026)(376014)(36860700013); DIR:OUT; SFP:1101; X-OriginatorOrg: amd.com X-MS-Exchange-CrossTenant-OriginalArrivalTime: 17 Sep 2024 20:16:37.0624 (UTC) X-MS-Exchange-CrossTenant-Network-Message-Id: 78f72041-6395-4d08-86c0-08dcd755a22a 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: SJ5PEPF00000205.namprd05.prod.outlook.com X-MS-Exchange-CrossTenant-AuthAs: Anonymous X-MS-Exchange-CrossTenant-FromEntityHeader: HybridOnPrem X-MS-Exchange-Transport-CrossTenantHeadersStamped: CY5PR12MB6408 From: Ashish Kalra The FEATURE_INFO command provides host and guests a programmatic means to learn about the supported features of the currently loaded firmware. FEATURE_INFO command leverages the same mechanism as the CPUID instruction. Instead of using the CPUID instruction to retrieve Fn8000_0024, software can use FEATURE_INFO. Host/Hypervisor would use the FEATURE_INFO command, while guests would actually issue the CPUID instruction. The hypervisor can provide Fn8000_0024 values to the guest via the CPUID page in SNP_LAUNCH_UPDATE. As with all CPUID output recorded in that page, the hypervisor can filter Fn8000_0024. The firmware will examine Fn8000_0024 and apply its CPUID policy. During CCP module initialization, after firmware update, the SNP platform status and feature information from CPUID 0x8000_0024, sub-function 0, are cached in the sev_device structure. Signed-off-by: Ashish Kalra --- drivers/crypto/ccp/sev-dev.c | 47 ++++++++++++++++++++++++++++++++++++ drivers/crypto/ccp/sev-dev.h | 3 +++ include/linux/psp-sev.h | 29 ++++++++++++++++++++++ 3 files changed, 79 insertions(+) diff --git a/drivers/crypto/ccp/sev-dev.c b/drivers/crypto/ccp/sev-dev.c index af018afd9cd7..564daf748293 100644 --- a/drivers/crypto/ccp/sev-dev.c +++ b/drivers/crypto/ccp/sev-dev.c @@ -223,6 +223,7 @@ static int sev_cmd_buffer_len(int cmd) case SEV_CMD_SNP_GUEST_REQUEST: return sizeof(struct sev_data_snp_guest_request); case SEV_CMD_SNP_CONFIG: return sizeof(struct sev_user_data_snp_config); case SEV_CMD_SNP_COMMIT: return sizeof(struct sev_data_snp_commit); + case SEV_CMD_SNP_FEATURE_INFO: return sizeof(struct snp_feature_info); default: return 0; } @@ -1063,6 +1064,50 @@ static void snp_set_hsave_pa(void *arg) wrmsrl(MSR_VM_HSAVE_PA, 0); } +static void snp_get_platform_data(void) +{ + struct sev_device *sev = psp_master->sev_data; + struct sev_data_snp_feature_info snp_feat_info; + struct snp_feature_info *feat_info; + struct sev_data_snp_addr buf; + int error = 0, rc; + + if (!cc_platform_has(CC_ATTR_HOST_SEV_SNP)) + return; + + /* + * The output buffer must be firmware page if SEV-SNP is + * initialized. + */ + if (sev->snp_initialized) + return; + + buf.address = __psp_pa(&sev->snp_plat_status); + rc = __sev_do_cmd_locked(SEV_CMD_SNP_PLATFORM_STATUS, &buf, &error); + + /* + * Do feature discovery of the currently loaded firmware, + * and cache feature information from CPUID 0x8000_0024, + * sub-function 0. + */ + if (!rc && sev->snp_plat_status.feature_info) { + /* + * Use dynamically allocated structure for the SNP_FEATURE_INFO + * command to handle any alignment and page boundary check + * requirements. + */ + feat_info = kzalloc(sizeof(*feat_info), GFP_KERNEL); + snp_feat_info.length = sizeof(snp_feat_info); + snp_feat_info.ecx_in = 0; + snp_feat_info.feature_info_paddr = __psp_pa(feat_info); + + rc = __sev_do_cmd_locked(SEV_CMD_SNP_FEATURE_INFO, &snp_feat_info, &error); + if (!rc) + sev->feat_info = *feat_info; + kfree(feat_info); + } +} + static int snp_filter_reserved_mem_regions(struct resource *rs, void *arg) { struct sev_data_range_list *range_list = arg; @@ -2415,6 +2460,8 @@ void sev_pci_init(void) api_major, api_minor, build, sev->api_major, sev->api_minor, sev->build); + snp_get_platform_data(); + /* Initialize the platform */ args.probe = true; rc = sev_platform_init(&args); diff --git a/drivers/crypto/ccp/sev-dev.h b/drivers/crypto/ccp/sev-dev.h index 3e4e5574e88a..1c1a51e52d2b 100644 --- a/drivers/crypto/ccp/sev-dev.h +++ b/drivers/crypto/ccp/sev-dev.h @@ -57,6 +57,9 @@ struct sev_device { bool cmd_buf_backup_active; bool snp_initialized; + + struct sev_user_data_snp_status snp_plat_status; + struct snp_feature_info feat_info; }; int sev_dev_init(struct psp_device *psp); diff --git a/include/linux/psp-sev.h b/include/linux/psp-sev.h index 903ddfea8585..6068a89839e1 100644 --- a/include/linux/psp-sev.h +++ b/include/linux/psp-sev.h @@ -107,6 +107,7 @@ enum sev_cmd { SEV_CMD_SNP_DOWNLOAD_FIRMWARE_EX = 0x0CA, SEV_CMD_SNP_COMMIT = 0x0CB, SEV_CMD_SNP_VLEK_LOAD = 0x0CD, + SEV_CMD_SNP_FEATURE_INFO = 0x0CE, SEV_CMD_MAX, }; @@ -812,6 +813,34 @@ struct sev_data_snp_commit { u32 len; } __packed; +/** + * struct sev_data_snp_feature_info - SEV_SNP_FEATURE_INFO structure + * + * @length: len of the command buffer read by the PSP + * @ecx_in: subfunction index + * @feature_info_paddr : SPA of the FEATURE_INFO structure + */ +struct sev_data_snp_feature_info { + u32 length; + u32 ecx_in; + u64 feature_info_paddr; +} __packed; + +/** + * struct feature_info - FEATURE_INFO structure + * + * @eax: output of SNP_FEATURE_INFO command + * @ebx: output of SNP_FEATURE_INFO command + * @ecx: output of SNP_FEATURE_INFO command + * #edx: output of SNP_FEATURE_INFO command + */ +struct snp_feature_info { + u32 eax; + u32 ebx; + u32 ecx; + u32 edx; +} __packed; + #ifdef CONFIG_CRYPTO_DEV_SP_PSP /** From patchwork Tue Sep 17 20:16:41 2024 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: "Kalra, Ashish" X-Patchwork-Id: 829453 Received: from NAM10-MW2-obe.outbound.protection.outlook.com (mail-mw2nam10on2054.outbound.protection.outlook.com [40.107.94.54]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id EC92718D642; 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Tue, 17 Sep 2024 15:16:50 -0500 From: Ashish Kalra To: , , , , , , , CC: , , , , , , , Subject: [PATCH v2 3/3] x86/sev: Add SEV-SNP CipherTextHiding support Date: Tue, 17 Sep 2024 20:16:41 +0000 Message-ID: X-Mailer: git-send-email 2.34.1 In-Reply-To: References: Precedence: bulk X-Mailing-List: linux-crypto@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-ClientProxiedBy: SATLEXMB04.amd.com (10.181.40.145) To SATLEXMB04.amd.com (10.181.40.145) X-EOPAttributedMessage: 0 X-MS-PublicTrafficType: Email X-MS-TrafficTypeDiagnostic: SJ5PEPF00000209:EE_|CY8PR12MB7145:EE_ X-MS-Office365-Filtering-Correlation-Id: d76cd972-049d-4605-22a0-08dcd755ab82 X-MS-Exchange-SenderADCheck: 1 X-MS-Exchange-AntiSpam-Relay: 0 X-Microsoft-Antispam: BCL:0; ARA:13230040|82310400026|36860700013|1800799024|7416014|376014; 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:(13230040)(82310400026)(36860700013)(1800799024)(7416014)(376014); DIR:OUT; SFP:1101; X-OriginatorOrg: amd.com X-MS-Exchange-CrossTenant-OriginalArrivalTime: 17 Sep 2024 20:16:52.8298 (UTC) X-MS-Exchange-CrossTenant-Network-Message-Id: d76cd972-049d-4605-22a0-08dcd755ab82 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: SJ5PEPF00000209.namprd05.prod.outlook.com X-MS-Exchange-CrossTenant-AuthAs: Anonymous X-MS-Exchange-CrossTenant-FromEntityHeader: HybridOnPrem X-MS-Exchange-Transport-CrossTenantHeadersStamped: CY8PR12MB7145 From: Ashish Kalra Ciphertext hiding prevents host accesses from reading the ciphertext of SNP guest private memory. Instead of reading ciphertext, the host reads will see constant default values (0xff). Ciphertext hiding separates the ASID space into SNP guest ASIDs and host ASIDs. All SNP active guests must have an ASID less than or equal to MAX_SNP_ASID provided to the SNP_INIT_EX command. All SEV-legacy guests (SEV and SEV-ES) must be greater than MAX_SNP_ASID. This patch-set adds a new module parameter to the CCP driver defined as max_snp_asid which is a user configurable MAX_SNP_ASID to define the system-wide maximum SNP ASID value. If this value is not set, then the ASID space is equally divided between SEV-SNP and SEV-ES guests. Ciphertext hiding needs to be enabled on SNP_INIT_EX and therefore this new module parameter has to added to the CCP driver. Signed-off-by: Ashish Kalra --- arch/x86/kvm/svm/sev.c | 26 ++++++++++++++---- drivers/crypto/ccp/sev-dev.c | 52 ++++++++++++++++++++++++++++++++++++ include/linux/psp-sev.h | 12 +++++++-- 3 files changed, 83 insertions(+), 7 deletions(-) diff --git a/arch/x86/kvm/svm/sev.c b/arch/x86/kvm/svm/sev.c index 0b851ef937f2..a345b4111ad6 100644 --- a/arch/x86/kvm/svm/sev.c +++ b/arch/x86/kvm/svm/sev.c @@ -171,7 +171,7 @@ static void sev_misc_cg_uncharge(struct kvm_sev_info *sev) misc_cg_uncharge(type, sev->misc_cg, 1); } -static int sev_asid_new(struct kvm_sev_info *sev) +static int sev_asid_new(struct kvm_sev_info *sev, unsigned long vm_type) { /* * SEV-enabled guests must use asid from min_sev_asid to max_sev_asid. @@ -199,6 +199,18 @@ static int sev_asid_new(struct kvm_sev_info *sev) mutex_lock(&sev_bitmap_lock); + /* + * When CipherTextHiding is enabled, all SNP guests must have an + * ASID less than or equal to MAX_SNP_ASID provided on the + * SNP_INIT_EX command and all the SEV-ES guests must have + * an ASID greater than MAX_SNP_ASID. + */ + if (snp_cipher_text_hiding && sev->es_active) { + if (vm_type == KVM_X86_SNP_VM) + max_asid = snp_max_snp_asid; + else + min_asid = snp_max_snp_asid + 1; + } again: asid = find_next_zero_bit(sev_asid_bitmap, max_asid + 1, min_asid); if (asid > max_asid) { @@ -440,7 +452,7 @@ static int __sev_guest_init(struct kvm *kvm, struct kvm_sev_cmd *argp, if (vm_type == KVM_X86_SNP_VM) sev->vmsa_features |= SVM_SEV_FEAT_SNP_ACTIVE; - ret = sev_asid_new(sev); + ret = sev_asid_new(sev, vm_type); if (ret) goto e_no_asid; @@ -3059,14 +3071,18 @@ void __init sev_hardware_setup(void) "unusable" : "disabled", min_sev_asid, max_sev_asid); - if (boot_cpu_has(X86_FEATURE_SEV_ES)) + if (boot_cpu_has(X86_FEATURE_SEV_ES)) { + if (snp_max_snp_asid >= (min_sev_asid - 1)) + sev_es_supported = false; pr_info("SEV-ES %s (ASIDs %u - %u)\n", sev_es_supported ? "enabled" : "disabled", - min_sev_asid > 1 ? 1 : 0, min_sev_asid - 1); + min_sev_asid > 1 ? snp_max_snp_asid ? snp_max_snp_asid + 1 : 1 : + 0, min_sev_asid - 1); + } if (boot_cpu_has(X86_FEATURE_SEV_SNP)) pr_info("SEV-SNP %s (ASIDs %u - %u)\n", sev_snp_supported ? "enabled" : "disabled", - min_sev_asid > 1 ? 1 : 0, min_sev_asid - 1); + min_sev_asid > 1 ? 1 : 0, snp_max_snp_asid ? : min_sev_asid - 1); sev_enabled = sev_supported; sev_es_enabled = sev_es_supported; diff --git a/drivers/crypto/ccp/sev-dev.c b/drivers/crypto/ccp/sev-dev.c index 564daf748293..77900abb1b46 100644 --- a/drivers/crypto/ccp/sev-dev.c +++ b/drivers/crypto/ccp/sev-dev.c @@ -73,11 +73,27 @@ static bool psp_init_on_probe = true; module_param(psp_init_on_probe, bool, 0444); MODULE_PARM_DESC(psp_init_on_probe, " if true, the PSP will be initialized on module init. Else the PSP will be initialized on the first command requiring it"); +static bool cipher_text_hiding = true; +module_param(cipher_text_hiding, bool, 0444); +MODULE_PARM_DESC(cipher_text_hiding, " if true, the PSP will enable Cipher Text Hiding"); + +static int max_snp_asid; +module_param(max_snp_asid, int, 0444); +MODULE_PARM_DESC(max_snp_asid, " override MAX_SNP_ASID for Cipher Text Hiding"); + MODULE_FIRMWARE("amd/amd_sev_fam17h_model0xh.sbin"); /* 1st gen EPYC */ MODULE_FIRMWARE("amd/amd_sev_fam17h_model3xh.sbin"); /* 2nd gen EPYC */ MODULE_FIRMWARE("amd/amd_sev_fam19h_model0xh.sbin"); /* 3rd gen EPYC */ MODULE_FIRMWARE("amd/amd_sev_fam19h_model1xh.sbin"); /* 4th gen EPYC */ +/* Cipher Text Hiding Enabled */ +bool snp_cipher_text_hiding; +EXPORT_SYMBOL(snp_cipher_text_hiding); + +/* MAX_SNP_ASID */ +unsigned int snp_max_snp_asid; +EXPORT_SYMBOL(snp_max_snp_asid); + static bool psp_dead; static int psp_timeout; @@ -1064,6 +1080,38 @@ static void snp_set_hsave_pa(void *arg) wrmsrl(MSR_VM_HSAVE_PA, 0); } +static void sev_snp_enable_ciphertext_hiding(struct sev_data_snp_init_ex *data, int *error) +{ + struct psp_device *psp = psp_master; + struct sev_device *sev; + unsigned int edx; + + sev = psp->sev_data; + + /* + * Check if CipherTextHiding feature is supported and enabled + * in the Platform/BIOS. + */ + if ((sev->feat_info.ecx & SNP_CIPHER_TEXT_HIDING_SUPPORTED) && + sev->snp_plat_status.ciphertext_hiding_cap) { + /* Retrieve SEV CPUID information */ + edx = cpuid_edx(0x8000001f); + /* Do sanity checks on user-defined MAX_SNP_ASID */ + if (max_snp_asid >= edx) { + dev_info(sev->dev, "max_snp_asid module parameter is not valid, limiting to %d\n", + edx - 1); + max_snp_asid = edx - 1; + } + snp_max_snp_asid = max_snp_asid ? : (edx - 1) / 2; + + snp_cipher_text_hiding = 1; + data->ciphertext_hiding_en = 1; + data->max_snp_asid = snp_max_snp_asid; + + dev_dbg(sev->dev, "SEV-SNP CipherTextHiding feature support enabled\n"); + } +} + static void snp_get_platform_data(void) { struct sev_device *sev = psp_master->sev_data; @@ -1199,6 +1247,10 @@ static int __sev_snp_init_locked(int *error) } memset(&data, 0, sizeof(data)); + + if (cipher_text_hiding) + sev_snp_enable_ciphertext_hiding(&data, error); + data.init_rmp = 1; data.list_paddr_en = 1; data.list_paddr = __psp_pa(snp_range_list); diff --git a/include/linux/psp-sev.h b/include/linux/psp-sev.h index 6068a89839e1..2102248bd436 100644 --- a/include/linux/psp-sev.h +++ b/include/linux/psp-sev.h @@ -27,6 +27,9 @@ enum sev_state { SEV_STATE_MAX }; +extern bool snp_cipher_text_hiding; +extern unsigned int snp_max_snp_asid; + /** * SEV platform and guest management commands */ @@ -746,10 +749,13 @@ struct sev_data_snp_guest_request { struct sev_data_snp_init_ex { u32 init_rmp:1; u32 list_paddr_en:1; - u32 rsvd:30; + u32 rapl_dis:1; + u32 ciphertext_hiding_en:1; + u32 rsvd:28; u32 rsvd1; u64 list_paddr; - u8 rsvd2[48]; + u16 max_snp_asid; + u8 rsvd2[46]; } __packed; /** @@ -841,6 +847,8 @@ struct snp_feature_info { u32 edx; } __packed; +#define SNP_CIPHER_TEXT_HIDING_SUPPORTED BIT(3) + #ifdef CONFIG_CRYPTO_DEV_SP_PSP /**