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David Alan Gilbert" , , , , Brijesh Singh Subject: [PATCH v8 00/40] Add AMD Secure Nested Paging (SEV-SNP) Guest Support Date: Fri, 10 Dec 2021 09:42:52 -0600 Message-ID: <20211210154332.11526-1-brijesh.singh@amd.com> X-Mailer: git-send-email 2.25.1 MIME-Version: 1.0 Content-Type: text/plain; charset="UTF-8" X-Originating-IP: [10.180.168.240] X-ClientProxiedBy: SATLEXMB03.amd.com (10.181.40.144) To SATLEXMB03.amd.com (10.181.40.144) X-EOPAttributedMessage: 0 X-MS-PublicTrafficType: Email X-MS-Office365-Filtering-Correlation-Id: 3e223e0e-6867-49bf-c6b2-08d9bbf3dcc5 X-MS-TrafficTypeDiagnostic: DM5PR12MB2487:EE_ X-Microsoft-Antispam-PRVS: X-MS-Oob-TLC-OOBClassifiers: OLM:10000; X-MS-Exchange-SenderADCheck: 1 X-MS-Exchange-AntiSpam-Relay: 0 X-Microsoft-Antispam: BCL:0; X-Microsoft-Antispam-Message-Info: IFCz9NPuSmi17j0m75Q83x7e8s8XmV/xucxGLQv7tmKcChIvRETlnpe4iALw7TUrURJYvqxvscmqcanSSLiNTT0J7TUvfs3AvGTZGB3l3KgUEccHipmBut9vRFfe3usN8jQlfvIDZuQU+Shom/yqUIBYeRLWfA31qxDB7QEUzgc2ktKBqLfatQ8sjVtN30tPMfblkSI+t/5Dr+hRt19qMuv592YglKHPAnJfcGAPhgLrd0NTgW37swOTOVNdD6akZwIV8U6pRvzkzoPezbEfhtO1/crYSD57Q/xS57f9KV3pXqa8VaL/sAhmndw0R+6XxrF8glD4HyxE0bZwC4zRED7wxWpYShehlbQqjuXQVHz9no0cjYcbF1iu/KtGOAlyuJVPAHdM//dLpl934sTvKobm71KOZj1pO1ZIyQhHxDzoaobPz7J+lpgfD6NSIDTUAlvZV2m6KwWDMDqBWD5jdHNoM4RC8EVRvz0eY2O3xjMlXCTA3I9NFm1D/SX4MKqfB0898P84+N6GMHJiUPHR0shpGII+NZYBBNfHflOBSIjZNipzX6Ol2rZBxxkGxhtZQd/LdfvsibqZLL9SOMH+A2c8qosVa1ciRgE5uJHQ56MZ2yzI+JXIVp6NpoN69bYNlcYiMrLD4d10qy/Qa9IUat4/uEQ8a1Vam/TBGpBWgBGmG/TSYRNg0fNSafhJkuzeHL3BuY7uvF/Cc37R32U3RCJPnehMMPFIgu6gICRQQ4YrJJu6I+RdFDXQD+I1efMbuba/eM1RYMK6ljMPOaBrvKmw2V2Yq1aHX3W300a2vcxEF4HQvWRYNfzee80tkMXYJfjVJxOFGslQeHf4zx0hsLU4qoXRog7LnW0w/yiDpWuEf4wfC6TPJ9Ym8cd3y6NEcgVhaYJxedqAOendTl3dA2TPxXXc+8rCGhorAV5xSgJUXXHcHWdifoocrTHsJ02J X-Forefront-Antispam-Report: CIP:165.204.84.17;CTRY:US;LANG:en;SCL:1;SRV:;IPV:CAL;SFV:NSPM;H:SATLEXMB03.amd.com;PTR:InfoDomainNonexistent;CAT:NONE;SFS:(4636009)(36840700001)(46966006)(40470700001)(6666004)(36756003)(54906003)(44832011)(110136005)(2906002)(83380400001)(8936002)(5660300002)(70586007)(426003)(8676002)(508600001)(2616005)(70206006)(336012)(30864003)(7416002)(7406005)(36860700001)(47076005)(26005)(4326008)(7696005)(186003)(16526019)(40460700001)(86362001)(82310400004)(1076003)(316002)(966005)(81166007)(356005)(2101003)(36900700001);DIR:OUT;SFP:1101; X-OriginatorOrg: amd.com X-MS-Exchange-CrossTenant-OriginalArrivalTime: 10 Dec 2021 15:43:50.4123 (UTC) X-MS-Exchange-CrossTenant-Network-Message-Id: 3e223e0e-6867-49bf-c6b2-08d9bbf3dcc5 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=[SATLEXMB03.amd.com] X-MS-Exchange-CrossTenant-AuthSource: BN8NAM11FT065.eop-nam11.prod.protection.outlook.com X-MS-Exchange-CrossTenant-AuthAs: Anonymous X-MS-Exchange-CrossTenant-FromEntityHeader: HybridOnPrem X-MS-Exchange-Transport-CrossTenantHeadersStamped: DM5PR12MB2487 X-Rspamd-Server: rspam01 X-Rspamd-Queue-Id: A072118000E X-Stat-Signature: zh5fhihpz7ojq57zo6wd1xim35wdtjo4 Authentication-Results: imf06.hostedemail.com; dkim=pass header.d=amd.com header.s=selector1 header.b=WV5cqIJJ; spf=pass (imf06.hostedemail.com: domain of brijesh.singh@amd.com designates 40.107.94.41 as permitted sender) smtp.mailfrom=brijesh.singh@amd.com; dmarc=pass (policy=quarantine) header.from=amd.com X-HE-Tag: 1639151038-414696 Content-Transfer-Encoding: quoted-printable 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: This part of Secure Encrypted Paging (SEV-SNP) series focuses on the chan= ges required in a guest OS for SEV-SNP support. SEV-SNP builds upon existing SEV and SEV-ES functionality while adding new hardware-based memory protections. SEV-SNP adds strong memory integri= ty protection to help prevent malicious hypervisor-based attacks like data replay, memory re-mapping and more in order to create an isolated memory encryption environment. =20 This series provides the basic building blocks to support booting the SEV= -SNP VMs, it does not cover all the security enhancement introduced by the SEV= -SNP such as interrupt protection. Many of the integrity guarantees of SEV-SNP are enforced through a new structure called the Reverse Map Table (RMP). Adding a new page to SEV-SN= P VM requires a 2-step process. First, the hypervisor assigns a page to the guest using the new RMPUPDATE instruction. This transitions the page to guest-invalid. Second, the guest validates the page using the new PVALIDA= TE instruction. The SEV-SNP VMs can use the new "Page State Change Request N= AE" defined in the GHCB specification to ask hypervisor to add or remove page from the RMP table. Each page assigned to the SEV-SNP VM can either be validated or unvalidat= ed, as indicated by the Validated flag in the page's RMP entry. There are two approaches that can be taken for the page validation: Pre-validation and Lazy Validation. Under pre-validation, the pages are validated prior to first use. And und= er lazy validation, pages are validated when first accessed. An access to a unvalidated page results in a #VC exception, at which time the exception handler may validate the page. Lazy validation requires careful tracking = of the validated pages to avoid validating the same GPA more than once. The recently introduced "Unaccepted" memory type can be used to communicate t= he unvalidated memory ranges to the Guest OS. At this time we only sypport the pre-validation, the OVMF guest BIOS validates the entire RAM before the control is handed over to the guest k= ernel. The early_set_memory_{encrypt,decrypt} and set_memory_{encrypt,decrypt} a= re enlightened to perform the page validation or invalidation while setting = or clearing the encryption attribute from the page table. This series does not provide support for the Interrupt security yet which= will be added after the base support. The series is based on tip/master 7f32a31b0a34 (origin/master, origin/HEAD) Merge branch into tip/master:= 'core/entry' Additional resources --------------------- SEV-SNP whitepaper https://www.amd.com/system/files/TechDocs/SEV-SNP-strengthening-vm-isolat= ion-with-integrity-protection-and-more.pdf =20 APM 2: https://www.amd.com/system/files/TechDocs/24593.pdf (section 15.36) GHCB spec: https://developer.amd.com/wp-content/resources/56421.pdf SEV-SNP firmware specification: https://developer.amd.com/sev/ v7: https://lore.kernel.org/linux-mm/20211110220731.2396491-40-brijesh.si= ngh@amd.com/ v6: https://lore.kernel.org/linux-mm/20211008180453.462291-1-brijesh.sing= h@amd.com/ v5: https://lore.kernel.org/lkml/20210820151933.22401-1-brijesh.singh@amd= .com/ Changes since v7: * sevguest: extend the get report structure to accept the vmpl from user= space. * In the compressed path, move the GHCB protocol negotiation from VC han= dler to sev_enable(). * sev_enable(): don't expect SEV bit in status MSR when cpuid bit is pre= sent, update comments. * sme_enable(): call directly from head_64.S rather than as part of star= tup_64_setup_env, add comments * snp_find_cc_blob(), sev_prep_identity_maps(): add missing 'static' key= words to function prototypes Changes since v6: * Add rmpadjust() helper to be used by AP creation and vmpl0 detect func= tion. * Clear the VM communication key if guest detects that hypervisor is mod= ifying the SNP_GUEST_REQ response header. * Move the per-cpu GHCB registration from first #VC to idt setup. * Consolidate initial SEV/SME setup into a common entry point that gets = called early enough to also be used for SEV-SNP CPUID table setup. * SNP CPUID: separate initial SEV-SNP feature detection out into standal= one snp_init() routines, then add CPUID table setup to it as a separate pa= tch. * SNP CPUID: fix boot issue with Seabios due to ACPI relying on certain = EFI config table lookup failures as fallthrough cases rather than error ca= ses. * SNP CPUID: drop the use of a separate init routines to handle pointer = fixups after switching to kernel virtual addresses, instead use a helper that= uses RIP-relative addressing to access CPUID table when either on identity = mapping or kernel virtual addresses. Changes since v5: * move the seqno allocation in the sevguest driver. * extend snp_issue_guest_request() to accept the exit_info to simplify t= he logic. * use smaller structure names based on feedback. * explicitly clear the memory after the SNP guest request is completed. * cpuid validation: use a local copy of cpuid table instead of keeping firmware table mapped throughout boot. * cpuid validation: coding style fix-ups and refactor cpuid-related help= ers as suggested. * cpuid validation: drop a number of BOOT_COMPRESSED-guarded defs/declar= ations by moving things like snp_cpuid_init*() out of sev-shared.c and keepin= g only the common bits there. * Break up EFI config table helpers and related acpi.c changes into sepa= rate patches. * re-enable stack protection for 32-bit kernels as well, not just 64-bit Changes since v4: * Address the cpuid specific review comment * Simplified the macro based on the review feedback * Move macro definition to the patch that needs it * Fix the issues reported by the checkpath * Address the AP creation specific review comment Changes since v3: * Add support to use the PSP filtered CPUID. * Add support for the extended guest request. * Move sevguest driver in driver/virt/coco. * Add documentation for sevguest ioctl. * Add support to check the vmpl0. * Pass the VM encryption key and id to be used for encrypting guest mess= ages through the platform drv data. * Multiple cleanup and fixes to address the review feedbacks. Changes since v2: * Add support for AP startup using SNP specific vmgexit. * Add snp_prep_memory() helper. * Drop sev_snp_active() helper. * Add sev_feature_enabled() helper to check which SEV feature is active. * Sync the SNP guest message request header with latest SNP FW spec. * Multiple cleanup and fixes to address the review feedbacks. Changes since v1: * Integerate the SNP support in sev.{ch}. * Add support to query the hypervisor feature and detect whether SNP is = supported. * Define Linux specific reason code for the SNP guest termination. * Extend the setup_header provide a way for hypervisor to pass secret an= d cpuid page. * Add support to create a platform device and driver to query the attest= ation report and the derive a key. * Multiple cleanup and fixes to address Boris's review fedback. Brijesh Singh (21): x86/mm: Extend cc_attr to include AMD SEV-SNP x86/sev: Define the Linux specific guest termination reasons x86/sev: Save the negotiated GHCB version x86/sev: Check SEV-SNP features support x86/sev: Add a helper for the PVALIDATE instruction x86/sev: Check the vmpl level x86/compressed: Add helper for validating pages in the decompression stage x86/compressed: Register GHCB memory when SEV-SNP is active x86/sev: Register GHCB memory when SEV-SNP is active x86/sev: Add helper for validating pages in early enc attribute changes x86/kernel: Make the bss.decrypted section shared in RMP table x86/kernel: Validate rom memory before accessing when SEV-SNP is active x86/mm: Add support to validate memory when changing C-bit KVM: SVM: Define sev_features and vmpl field in the VMSA KVM: SVM: Create a separate mapping for the SEV-ES save area x86/boot: Add Confidential Computing type to setup_data x86/sev: Provide support for SNP guest request NAEs x86/sev: Register SNP guest request platform device virt: Add SEV-SNP guest driver virt: sevguest: Add support to derive key virt: sevguest: Add support to get extended report Michael Roth (16): x86/compressed/64: detect/setup SEV/SME features earlier in boot x86/sev: detect/setup SEV/SME features earlier in boot x86/head: re-enable stack protection for 32/64-bit builds x86/sev: move MSR-based VMGEXITs for CPUID to helper KVM: x86: move lookup of indexed CPUID leafs to helper x86/compressed/acpi: move EFI system table lookup to helper x86/compressed/acpi: move EFI config table lookup to helper x86/compressed/acpi: move EFI vendor table lookup to helper KVM: SEV: Add documentation for SEV-SNP CPUID Enforcement x86/compressed/64: add support for SEV-SNP CPUID table in #VC handlers x86/boot: add a pointer to Confidential Computing blob in bootparams x86/compressed: add SEV-SNP feature detection/setup x86/compressed: use firmware-validated CPUID for SEV-SNP guests x86/compressed/64: add identity mapping for Confidential Computing blob x86/sev: add SEV-SNP feature detection/setup x86/sev: use firmware-validated CPUID for SEV-SNP guests Tom Lendacky (3): KVM: SVM: Create a separate mapping for the GHCB save area KVM: SVM: Update the SEV-ES save area mapping x86/sev: Use SEV-SNP AP creation to start secondary CPUs Documentation/virt/coco/sevguest.rst | 121 +++ .../virt/kvm/amd-memory-encryption.rst | 28 + arch/x86/boot/compressed/Makefile | 1 + arch/x86/boot/compressed/acpi.c | 129 +-- arch/x86/boot/compressed/efi.c | 179 ++++ arch/x86/boot/compressed/head_64.S | 32 +- arch/x86/boot/compressed/ident_map_64.c | 44 +- arch/x86/boot/compressed/mem_encrypt.S | 36 - arch/x86/boot/compressed/misc.h | 44 +- arch/x86/boot/compressed/sev.c | 249 +++++- arch/x86/include/asm/bootparam_utils.h | 1 + arch/x86/include/asm/cpuid.h | 26 + arch/x86/include/asm/msr-index.h | 2 + arch/x86/include/asm/sev-common.h | 82 ++ arch/x86/include/asm/sev.h | 96 +- arch/x86/include/asm/svm.h | 171 +++- arch/x86/include/uapi/asm/bootparam.h | 4 +- arch/x86/include/uapi/asm/svm.h | 13 + arch/x86/kernel/Makefile | 1 - arch/x86/kernel/cc_platform.c | 2 + arch/x86/kernel/cpu/common.c | 4 + arch/x86/kernel/head64.c | 11 +- arch/x86/kernel/head_64.S | 37 + arch/x86/kernel/probe_roms.c | 13 +- arch/x86/kernel/sev-shared.c | 539 ++++++++++- arch/x86/kernel/sev.c | 841 ++++++++++++++++-- arch/x86/kernel/smpboot.c | 3 + arch/x86/kvm/cpuid.c | 17 +- arch/x86/kvm/svm/sev.c | 24 +- arch/x86/kvm/svm/svm.c | 4 +- arch/x86/kvm/svm/svm.h | 2 +- arch/x86/mm/mem_encrypt.c | 55 +- arch/x86/mm/mem_encrypt_identity.c | 8 + arch/x86/mm/pat/set_memory.c | 15 + drivers/virt/Kconfig | 3 + drivers/virt/Makefile | 1 + drivers/virt/coco/sevguest/Kconfig | 9 + drivers/virt/coco/sevguest/Makefile | 2 + drivers/virt/coco/sevguest/sevguest.c | 738 +++++++++++++++ drivers/virt/coco/sevguest/sevguest.h | 98 ++ include/linux/cc_platform.h | 8 + include/linux/efi.h | 1 + include/uapi/linux/sev-guest.h | 77 ++ 43 files changed, 3474 insertions(+), 297 deletions(-) create mode 100644 Documentation/virt/coco/sevguest.rst create mode 100644 arch/x86/boot/compressed/efi.c create mode 100644 arch/x86/include/asm/cpuid.h create mode 100644 drivers/virt/coco/sevguest/Kconfig create mode 100644 drivers/virt/coco/sevguest/Makefile create mode 100644 drivers/virt/coco/sevguest/sevguest.c create mode 100644 drivers/virt/coco/sevguest/sevguest.h create mode 100644 include/uapi/linux/sev-guest.h --=20 2.25.1