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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=satlexmb07.amd.com; pr=C Received: from satlexmb07.amd.com (165.204.84.17) by SJ5PEPF000001ED.mail.protection.outlook.com (10.167.242.201) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.21.546.15 via Frontend Transport; Thu, 22 Oct 2026 04:25:58 +0000 Received: from purico-9dcchost.amd.com (10.180.168.240) by satlexmb07.amd.com (10.181.42.216) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.2.2562.53; Wed, 21 Oct 2026 23:25:57 -0500 From: Melody Wang To: CC: LKML , Tom Lendacky , , Melody Wang Subject: [PATCH v5 0/7] Alternate Injection: Secure Interrupt Delivery for SEV-SNP Guests - Guest Support Date: Thu, 22 Oct 2026 04:25:36 +0000 Message-ID: X-Mailer: git-send-email 2.43.0 X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Post: List-Help: List-Subscribe: List-Unsubscribe: List-Owner: Precedence: list MIME-Version: 1.0 Content-Transfer-Encoding: 8bit Content-Type: text/plain X-ClientProxiedBy: satlexmb07.amd.com (10.181.42.216) To satlexmb07.amd.com (10.181.42.216) X-EOPAttributedMessage: 0 X-MS-PublicTrafficType: Email X-MS-TrafficTypeDiagnostic: SJ5PEPF000001ED:EE_|CC6PR12MB259526:EE_ X-MS-Office365-Filtering-Correlation-Id: ab226d99-fe19-4557-aa8b-08df2ff49237 X-MS-Exchange-SenderADCheck: 1 X-MS-Exchange-AntiSpam-Relay: 0 X-Microsoft-Antispam: BCL:0;ARA:13230040|23010399003|376014|1800799024|36860700016|82310400026|261021130227099003|261021121427099003|56012099006|261021135927099003|11063799006|261009223027099003|10067099003|18002099003|261021123027099003|6133799003|3023799007; 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As Ard suggested, used a bool as return value for svsm_register_alt_inj() instead of int. Adjusted code with it. 2. Added more comments here for better understanding. Thanks, Melody Changelog: v4 -- This revision addresses all review comments from version 3. 1. As Ard suggested, handed over the registeration of kernel guest for Alternate Injection with the SVSM to the OVMF insteading of calling the SVSM for registration from kernel guest before ExitBootsService(). 2. Added a common function for SVSM APIC ICR read and write. 3. Added a common function for sev_apic_ghcb_msr_read/write. 4. Changed some comments for better understanding. 5. Patch "Make-SVSM-calls-preemption-safe.patch" was merged to the tip tree. v3 -- This revision addresses all review comments from version 2. The changes include: 1. Moved sev_prepare() from decompressor to EFI stub. 2. Changed "Register Alternate Injection" and "configure all interrupt vectors" as two APIs located in compressed/sev.c since they are self-contained, avoiding exporting functions. 3. Added more comments for better understanding. v2 -- This revision fixes all the review comments from version 1. The changes include: 1. Changed a few comments for better understanding, deleted some unnecessary code, corrected some typos, and some minor code fixes from the review comments by Sashiko and Boris. 2. Unified sev_apic_ghcb_msr_write() and sev_apic_ghcb_msr_read(). 3. Move x2apic_svsm.o after x2apic_savic.o so that the secure AVIC gets preferred on machines supporting it. 4. Reworked svsm_apic_probe() as Boris suggested. 5. Updated tools with renamed MSR_AMD64_SNP_ALTERNATE_INJ_BIT and MSR_AMD64_SNP_ALT_INJ for completeness' sake. 6. Changed svsm_apic_send_IPI_self() with writing to the dedicated APIC_SELF_IPI instead of writing to APIC_ICR. v1 -- The revision fixes all of the review comments from version 0. The changes include: 1. Changed a few commit messages, new file names, variables name and order, function names and more comments for better understanding. 2. Added a pre-patch to fix the problem that in two functions in the the SVSM vTPM guest implementation do not disable preemption when fetching CAA. It is moving the CAA fetching operation inside svsm_perform_call_protocol(). This series relies on this fix too. 3. Removed svsm_do_call() helper function and some intermediary layer functions in SVSM APIC driver. 4. Removed the Secure AVIC check in SVSM APIC driver since it will never be touched. 5. Terminate boot when Alternate Injection is enabled in vmpl0. 6. Added a common function for SVSM APIC read and write. 7. Added a new SEV_TERM_SET_LINUX value for Alternate Injection and APIC ghcb msr read/write. 8. Reworked sev_prepare() to reflect the error conditions correctly. 9. Moved allowing all of interrupts right after registering the SVSM APIC protocol. v0 -- Alternate Injection is a method to provide secure interrupt delivery for SEV-SNP guests against malicious injection attacks. By handing over the control of the interrupt injection to the guest itself, the security is applied. Alternate Injection use Secure VM Service Module (SVSM), and APIC emulation in the SVSM to secure interrupt delivery. This is the guest side patches. The patch set includes the following: 1. Add support for enabling Alternate Injection. 2. Add support for the SVSM APIC protocol which uses a subset of the X2APIC MSRs. 3. Add support to allow the guest OS to request Alternate Injection. Melody Wang (7): x86/sev: Add support for Alternate Injection x86/apic: Add an SVSM APIC driver x86/sev: Route unsupported APIC register accesses to the hypervisor APIC emulation x86/sev: Add a function to contain all SEV-specific setup operations x86/sev: Register the guest with the SVSM APIC protocol x86/sev: Allow the guest to configure interrupt vectors for the hypervisor x86/sev: Indicate that Alternate Injection is supported in the guest arch/x86/Kconfig | 14 ++ arch/x86/boot/compressed/sev.c | 11 +- arch/x86/boot/compressed/sev.h | 2 - arch/x86/boot/startup/sev-startup.c | 20 ++ arch/x86/boot/startup/sme.c | 3 + arch/x86/coco/core.c | 3 + arch/x86/coco/sev/core.c | 48 ++--- arch/x86/include/asm/msr-index.h | 4 +- arch/x86/include/asm/sev-common.h | 2 + arch/x86/include/asm/sev.h | 28 ++- arch/x86/kernel/apic/Makefile | 1 + arch/x86/kernel/apic/x2apic_savic.c | 8 +- arch/x86/kernel/apic/x2apic_svsm.c | 245 ++++++++++++++++++++++++ drivers/firmware/efi/libstub/efistub.h | 11 ++ drivers/firmware/efi/libstub/x86-stub.c | 42 +++- include/linux/cc_platform.h | 8 + include/linux/efi.h | 2 + tools/arch/x86/include/asm/msr-index.h | 4 +- 18 files changed, 406 insertions(+), 50 deletions(-) create mode 100644 arch/x86/kernel/apic/x2apic_svsm.c -- 2.43.0