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Peter Anvin" , "Peter Zijlstra" , Pavan Kumar Paluri Subject: [PATCH v2 1/2] x86, KVM:SVM: Move sev specific parsing into arch/x86/virt/svm Date: Mon, 2 Sep 2024 19:35:10 -0500 Message-ID: <20240903003511.1530454-2-papaluri@amd.com> X-Mailer: git-send-email 2.34.1 In-Reply-To: <20240903003511.1530454-1-papaluri@amd.com> References: <20240903003511.1530454-1-papaluri@amd.com> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable 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: SJ1PEPF00002319:EE_|SJ2PR12MB8011:EE_ X-MS-Office365-Filtering-Correlation-Id: e3644593-e6de-475f-69e8-08dccbb06052 X-MS-Exchange-SenderADCheck: 1 X-MS-Exchange-AntiSpam-Relay: 0 X-Microsoft-Antispam: BCL:0;ARA:13230040|1800799024|376014|82310400026|36860700013; X-Microsoft-Antispam-Message-Info: =?us-ascii?Q?HK+8qbGrpF8GabhOXwrg5c56h3688MaaMyXfUnh/FAa2eAVSN7FxKN1xU6hO?= =?us-ascii?Q?VZ+QRocrjsptPnYGr1WYO5R66jT33IImGNINyG1ahZmhFWa62e/BmYlg5bRE?= =?us-ascii?Q?rF60lPmIOKeLEXCZ2ogsnPBPrFfRfFNoCeDh5O2yAC2ytKLQ3SAx7H7jk+FH?= =?us-ascii?Q?49GoBQy5X0ESNVKf8yT0eNP+7PXqZ816S1rh14SkCMFmKoDB6muROOF3/WJe?= =?us-ascii?Q?LjKvTkEoD2w2o7M1wz40R2zcM92CH67oTiDyglZMsVeOUzTR7o8afBftWxLt?= =?us-ascii?Q?ZxCvH/g7dzb7zGpKeJgS+ZWai11EE+8wrj2ybiWXq5P35D0etfFpfKwu/2gp?= =?us-ascii?Q?Jw3ZhBl5xKu7ZVDqOF2Na0W/NDLuNy+ZPMMD+B8MOegcWqBfF+iacYfBkSAD?= =?us-ascii?Q?CYMb0jom1OL4Xb1S4I5ITY8p+fpt17xDCyfmuw/7lrANuQMKyAfcVkAY5CX+?= =?us-ascii?Q?eazeerV3MXzpv1TRCBOZ9Xy6x8I6wZOYpObzIQViQrYz2XOJKirXVTEXg/oF?= =?us-ascii?Q?Lv3muQ596P8P7W/lOx6XGrWS44gwXRg7IbNB7uYtAbwc6nLKn9qQgKZkQR+D?= =?us-ascii?Q?GaNIcaiJf4ZCryCROMGzCj46mkT9GGR7P3b0RT6MUvhxkmmGkz5oSTgEJCHM?= =?us-ascii?Q?EJszbUaKjXTkWWokk9Dn4q3ZQTrESk4dRvZcUTtLh2AJx9FYopdymSHnlAkk?= =?us-ascii?Q?2rXHJDNxRoxEqDrtwsgwExx1f2DmkqcN2TAJhVbE9vZD8q2bHXIYb3KQHkDa?= =?us-ascii?Q?9IKQS7cWlNOpHb9xVeHYSqGd0r28t7V46Kpj35jL/84WrdF6zVUxgpfMn7IK?= =?us-ascii?Q?e3EFB3ZaqLWoIU/M1zY4/z2HxE+OI0/kS07kUfNXqvfFG4kudwM3eiRDaDVM?= =?us-ascii?Q?US1u0pSeP38NpzZjhMICcwWkx4Ma/X0e0bTQFbxdp6kmpQiiB0nwUIgy3ueQ?= =?us-ascii?Q?14alzUSVzL105av8RV/SnHFKxp5YYNYb53xheZn569qs2D4pniHtgTcLZq6P?= =?us-ascii?Q?WYcRjR/VL7ZH/33Js32c53DonQ6DumlJ/EGnxCIXVg2WbrzLkWrhvxf3l78N?= =?us-ascii?Q?4Y/d7rDXx+pq93QYkgz/ebwnJGuZkU7p9sTzV5I38VP/CQfro2As0Xl//NBp?= =?us-ascii?Q?Uz+h79W8kOfeTTWUzjNMKUoMXN/6UNrmoXu6WSaIBuzSb3YutWEkmHSYkWGc?= =?us-ascii?Q?uNHWFqUx8S5H1Tnb5vEasVG8kYv7R5B27GqAklKWMIHph8mD3i/vDNRNSr1X?= =?us-ascii?Q?nHFkQms5mxNSIQyga1ll+9w73LSD8TSeDujABIOWjHbn+Xhc5ExGCgmTugUG?= =?us-ascii?Q?8ev//5SqJr4ilzyBR70KptvTzG8uBT78wl9UrPLAafeLFyztpIPnJhJ0idS2?= =?us-ascii?Q?nwKMt7oOZddKyvG0FE8WvnUfg701r/dzt3XtQoNObujaeFTNQseJeHfcDrkr?= =?us-ascii?Q?/99YcKZUMbjY4Hv9rdz7rnUdBVr3GLK3?= 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)(1800799024)(376014)(82310400026)(36860700013);DIR:OUT;SFP:1101; X-OriginatorOrg: amd.com X-MS-Exchange-CrossTenant-OriginalArrivalTime: 03 Sep 2024 00:35:56.5620 (UTC) X-MS-Exchange-CrossTenant-Network-Message-Id: e3644593-e6de-475f-69e8-08dccbb06052 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: SJ1PEPF00002319.namprd03.prod.outlook.com X-MS-Exchange-CrossTenant-AuthAs: Anonymous X-MS-Exchange-CrossTenant-FromEntityHeader: HybridOnPrem X-MS-Exchange-Transport-CrossTenantHeadersStamped: SJ2PR12MB8011 Content-Type: text/plain; charset="utf-8" Move SEV specific kernel command line option parsing support from arch/x86/coco/sev/core.c to arch/x86/virt/svm/cmdline.c so that both host and guest related SEV command line options can be supported. No functional changes intended. Signed-off-by: Pavan Kumar Paluri Reviewed-by: Tom Lendacky --- arch/x86/coco/sev/core.c | 44 ------------------------------- arch/x86/include/asm/sev-common.h | 30 +++++++++++++++++++++ arch/x86/virt/svm/Makefile | 1 + arch/x86/virt/svm/cmdline.c | 32 ++++++++++++++++++++++ 4 files changed, 63 insertions(+), 44 deletions(-) create mode 100644 arch/x86/virt/svm/cmdline.c diff --git a/arch/x86/coco/sev/core.c b/arch/x86/coco/sev/core.c index de1df0cb45da..ff19e805e7a1 100644 --- a/arch/x86/coco/sev/core.c +++ b/arch/x86/coco/sev/core.c @@ -141,33 +141,6 @@ static DEFINE_PER_CPU(struct sev_es_save_area *, sev_v= msa); static DEFINE_PER_CPU(struct svsm_ca *, svsm_caa); static DEFINE_PER_CPU(u64, svsm_caa_pa); =20 -struct sev_config { - __u64 debug : 1, - - /* - * Indicates when the per-CPU GHCB has been created and registered - * and thus can be used by the BSP instead of the early boot GHCB. - * - * For APs, the per-CPU GHCB is created before they are started - * and registered upon startup, so this flag can be used globally - * for the BSP and APs. - */ - ghcbs_initialized : 1, - - /* - * Indicates when the per-CPU SVSM CA is to be used instead of the - * boot SVSM CA. - * - * For APs, the per-CPU SVSM CA is created as part of the AP - * bringup, so this flag can be used globally for the BSP and APs. - */ - use_cas : 1, - - __reserved : 61; -}; - -static struct sev_config sev_cfg __read_mostly; - static __always_inline bool on_vc_stack(struct pt_regs *regs) { unsigned long sp =3D regs->sp; @@ -2374,23 +2347,6 @@ static int __init report_snp_info(void) } arch_initcall(report_snp_info); =20 -static int __init init_sev_config(char *str) -{ - char *s; - - while ((s =3D strsep(&str, ","))) { - if (!strcmp(s, "debug")) { - sev_cfg.debug =3D true; - continue; - } - - pr_info("SEV command-line option '%s' was not recognized\n", s); - } - - return 1; -} -__setup("sev=3D", init_sev_config); - static void update_attest_input(struct svsm_call *call, struct svsm_attest= _call *input) { /* If (new) lengths have been returned, propagate them up */ diff --git a/arch/x86/include/asm/sev-common.h b/arch/x86/include/asm/sev-c= ommon.h index 98726c2b04f8..d3e7f97e2a4a 100644 --- a/arch/x86/include/asm/sev-common.h +++ b/arch/x86/include/asm/sev-common.h @@ -8,6 +8,9 @@ #ifndef __ASM_X86_SEV_COMMON_H #define __ASM_X86_SEV_COMMON_H =20 +#include +#include + #define GHCB_MSR_INFO_POS 0 #define GHCB_DATA_LOW 12 #define GHCB_MSR_INFO_MASK (BIT_ULL(GHCB_DATA_LOW) - 1) @@ -220,4 +223,31 @@ struct snp_psc_desc { #define GHCB_ERR_INVALID_INPUT 5 #define GHCB_ERR_INVALID_EVENT 6 =20 +struct sev_config { + __u64 debug : 1, + + /* + * Indicates when the per-CPU GHCB has been created and registered + * and thus can be used by the BSP instead of the early boot GHCB. + * + * For APs, the per-CPU GHCB is created before they are started + * and registered upon startup, so this flag can be used globally + * for the BSP and APs. + */ + ghcbs_initialized : 1, + + /* + * Indicates when the per-CPU SVSM CA is to be used instead of the + * boot SVSM CA. + * + * For APs, the per-CPU SVSM CA is created as part of the AP + * bringup, so this flag can be used globally for the BSP and APs. + */ + use_cas : 1, + + __reserved : 61; +}; + +extern struct sev_config sev_cfg __read_mostly; + #endif diff --git a/arch/x86/virt/svm/Makefile b/arch/x86/virt/svm/Makefile index ef2a31bdcc70..eca6d71355fa 100644 --- a/arch/x86/virt/svm/Makefile +++ b/arch/x86/virt/svm/Makefile @@ -1,3 +1,4 @@ # SPDX-License-Identifier: GPL-2.0 =20 obj-$(CONFIG_KVM_AMD_SEV) +=3D sev.o +obj-$(CONFIG_CPU_SUP_AMD) +=3D cmdline.o diff --git a/arch/x86/virt/svm/cmdline.c b/arch/x86/virt/svm/cmdline.c new file mode 100644 index 000000000000..4fe34e831d8f --- /dev/null +++ b/arch/x86/virt/svm/cmdline.c @@ -0,0 +1,32 @@ +// SPDX-License-Identifier: GPL-2.0-only +/* + * AMD SVM-SEV command line parsing support + * + * Copyright (C) 2023 - 2024 Advanced Micro Devices, Inc. + * + * Author: Michael Roth + */ + +#include +#include + +#include + +struct sev_config sev_cfg; + +static int __init init_sev_config(char *str) +{ + char *s; + + while ((s =3D strsep(&str, ","))) { + if (!strcmp(s, "debug")) { + sev_cfg.debug =3D true; + continue; + } + + pr_info("SEV command-line option '%s' was not recognized\n", s); 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Peter Anvin" , "Peter Zijlstra" , Pavan Kumar Paluri Subject: [PATCH v2 2/2] x86 KVM:SVM: Provide "nosnp" boot option for sev kernel command line Date: Mon, 2 Sep 2024 19:35:11 -0500 Message-ID: <20240903003511.1530454-3-papaluri@amd.com> X-Mailer: git-send-email 2.34.1 In-Reply-To: <20240903003511.1530454-1-papaluri@amd.com> References: <20240903003511.1530454-1-papaluri@amd.com> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable 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: SJ1PEPF0000231F:EE_|DM4PR12MB6230:EE_ X-MS-Office365-Filtering-Correlation-Id: b9c1e6df-11dd-472d-a480-08dccbb06559 X-MS-Exchange-SenderADCheck: 1 X-MS-Exchange-AntiSpam-Relay: 0 X-Microsoft-Antispam: BCL:0;ARA:13230040|36860700013|1800799024|376014|82310400026; X-Microsoft-Antispam-Message-Info: =?us-ascii?Q?fnMSBUaZDSd2GAUwueK3pMwbJaVEVQ5OLUy9BW1GeQFFopJbptax8vLqyDHC?= =?us-ascii?Q?LadsBTZmx9wcr+UXdSLBYtXOrwiUfwjeAR/HVfwAjA/BdCn327g0SxKMar1B?= =?us-ascii?Q?BoImIroNSf0kGJMDYgnnIxHtOLhEBs7YuUDajDdY3lkDghafpPuA2c8jh4Wg?= =?us-ascii?Q?j+5/TXANAjKsVTUsphpxb10uX6yvHDodxFDgaVPNxxNdyl+kqnDLj+Jvu1Jv?= =?us-ascii?Q?XDLZH5R+ev6YRednhtsX2XNPBspeMDX7uGx0MXvf/g4rWq7Mx1NQYbBJGHEc?= =?us-ascii?Q?q8OReeG3r9Xl/4zWnOHxn+sauLXCnnKmRFcD0f/lFfbQ3KK5854LlklZzcYT?= =?us-ascii?Q?52GIJAn+j5NaTFPszLpK3NisabRWo+Ux56oiCfIEPJ36yJzYWXfjj3/Va39X?= =?us-ascii?Q?okFBMK5uuXIU6AncplFIk8Y0/i4pv0mH9sV45jMFT9yugX4rr/ffFAeGkIfH?= =?us-ascii?Q?JK6ywHZVu9WOwZp22HxtuUnsOJ+3nc6pGNeKwJ99qfyyZ0G7Nqo3D+Y1GH61?= =?us-ascii?Q?809J8QLb5pEu/733nvVq4EK9QYUENqIE+E4fQxodj3UzjN2Z9OBBdHv2Uo/Z?= =?us-ascii?Q?aXHk541azK/3Gx+OFtiHEQkA9T67/xmhZUP3Sz5z5qVGLIYZrWUk6PSAqSvK?= =?us-ascii?Q?qNqQZybsxdORlNWfYI8wU0f/4H36fVs8zmB8DRxC0u8C6DFenyX2qxqmat/T?= =?us-ascii?Q?MgVAE41ELz8Lk/TxSuGxs+fX1m8ouiKrkyKhDmbG54hJe7FuSbBC0rDHE0Xb?= =?us-ascii?Q?8AwP9H1pyEii4w5M5CVPAm8FWvGbhC/NWFd4pK2eStnk8PPbnaB1gv3a0+8k?= =?us-ascii?Q?CepXtdg8aWrQ8Edyp7iTVGts/F8c72CzsODmVQ7jRpHHM8D0mkEh/ggRrjmR?= =?us-ascii?Q?c8rrt74PFz4HukNVC0hAL8JUNscczHRhCkPFfZLaj7n7qhgpIy0OhoaBqBT/?= =?us-ascii?Q?w4EcKKNt4wFSi2kTQ0EO/oh7JB8NCX97wNSTCDel8phhvPKqsjPEzINuGh6n?= =?us-ascii?Q?a9sxtNaUpq+viBHv5c8AykqiTkE0tge6e2Zig4v7rWJTbETDaubivtB8fsoV?= =?us-ascii?Q?GeEjBkPA2yAgLfm5iugphNipbR3tf/8NrjYvDDhHcmven/lrfR4ZTrLkifLE?= =?us-ascii?Q?4k2kNqeTnGw6KhYchTVN3crgdM8k6NQ79NePaOVMTTYgCpEqdrSMpnD1fZDA?= =?us-ascii?Q?p0AzPtoKAegZtLctq9KW/46VhttaRNHLMCeEccqQIOZWc9DygpsOzlm8Y7xU?= =?us-ascii?Q?1nbCvRKwa2OC4gJLTOmRTTI14MPzzRooaLDuilMNBlV0Msw9blZFO+h/meDX?= =?us-ascii?Q?6OJiNO2YEHdXNeyImKGwSoJXn2xm3lko7CgMP0/tiBOpOxdlibh28zlMlyGI?= =?us-ascii?Q?ZCwB+NTN65OtvwEiC0R7WQE0WbnaNEh4mkLp5r1SldnnrTMLCOeavqN925WG?= =?us-ascii?Q?MMy8/sDJdUp0N1YER/1Z1+mcaiQv+20i?= 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)(36860700013)(1800799024)(376014)(82310400026);DIR:OUT;SFP:1101; X-OriginatorOrg: amd.com X-MS-Exchange-CrossTenant-OriginalArrivalTime: 03 Sep 2024 00:36:04.8417 (UTC) X-MS-Exchange-CrossTenant-Network-Message-Id: b9c1e6df-11dd-472d-a480-08dccbb06559 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: SJ1PEPF0000231F.namprd03.prod.outlook.com X-MS-Exchange-CrossTenant-AuthAs: Anonymous X-MS-Exchange-CrossTenant-FromEntityHeader: HybridOnPrem X-MS-Exchange-Transport-CrossTenantHeadersStamped: DM4PR12MB6230 Content-Type: text/plain; charset="utf-8" Provide a "nosnp" kernel command line option to prevent enabling of the RMP and SEV-SNP features in the host/hypervisor. Not initializing the RMP removes system overhead associated with RMP checks. Co-developed-by: Eric Van Tassell Signed-off-by: Eric Van Tassell Signed-off-by: Pavan Kumar Paluri Reviewed-by: Tom Lendacky --- Documentation/arch/x86/x86_64/boot-options.rst | 3 +++ arch/x86/virt/svm/cmdline.c | 7 +++++++ 2 files changed, 10 insertions(+) diff --git a/Documentation/arch/x86/x86_64/boot-options.rst b/Documentation= /arch/x86/x86_64/boot-options.rst index 137432d34109..3d4e9a7dccf2 100644 --- a/Documentation/arch/x86/x86_64/boot-options.rst +++ b/Documentation/arch/x86/x86_64/boot-options.rst @@ -317,3 +317,6 @@ The available options are: =20 debug Enable debug messages. + + nosnp + Do not enable SEV-SNP (applies to host/hypervisor only). diff --git a/arch/x86/virt/svm/cmdline.c b/arch/x86/virt/svm/cmdline.c index 4fe34e831d8f..43039ec67606 100644 --- a/arch/x86/virt/svm/cmdline.c +++ b/arch/x86/virt/svm/cmdline.c @@ -10,6 +10,7 @@ #include #include =20 +#include #include =20 struct sev_config sev_cfg; @@ -24,6 +25,12 @@ static int __init init_sev_config(char *str) continue; } =20 + if (!strcmp(s, "nosnp")) { + setup_clear_cpu_cap(X86_FEATURE_SEV_SNP); + cc_platform_clear(CC_ATTR_HOST_SEV_SNP); + continue; + } + pr_info("SEV command-line option '%s' was not recognized\n", s); } =20 --=20 2.34.1