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X-MS-Exchange-AntiSpam-MessageData-ChunkCount: 1 X-MS-Exchange-AntiSpam-MessageData-0: TbPfdMLZJGMy2a4/RRK7Ls7XcCQFK6ppZUng/kZohy32PXOmvGBCNV4bbyXoEuJl/1mJUS0kkggdeSE/IzHDtxXG1Xkw0RfKjAy1cos/AH+J4Lsc93AefxiD3xLTKzhxhKqNbJYaaZ9S5K4sIbGE7RnSwJUzHbDsbPs0WJSBwWgmFXhb2Bk/KTiDo7VXJxUT8d1Ex9ZTx6rVru/WGjC/oaUX3gUORJ7mFSWzLI6RCsKKSlrVhQbx3dQPNDtbqBdv+P7WYR/Gt5nx5i1xquG2EDCpIm1Qmy+wD7CKxYW3UcG83jJa6qiBXFPRJTEFKeyVJ9t2GUdQUEUMvkrUkOsYCtBbwEMa9rI1Hk/65h8gYLzSulHJl6rJEeWVkdL4SXE8oJxg5Du/kGD73OYwn/YbQhtw0Y82ANRaSjgbizAZ2be9njhESIV/HgzSqX4PUkWJ X-OriginatorOrg: amd.com X-MS-Exchange-CrossTenant-OriginalArrivalTime: 24 Apr 2026 17:42:58.3964 (UTC) X-MS-Exchange-CrossTenant-Network-Message-Id: 3f02d0c2-f3ca-4cb7-74ad-08dea228ec8f 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=[satlexmb07.amd.com] X-MS-Exchange-CrossTenant-AuthSource: BN2PEPF00004FC0.namprd04.prod.outlook.com X-MS-Exchange-CrossTenant-AuthAs: Anonymous X-MS-Exchange-CrossTenant-FromEntityHeader: HybridOnPrem X-MS-Exchange-Transport-CrossTenantHeadersStamped: DS0PR12MB9040 Restricted injection is a feature which enforces additional interrupt and event injection security protections for a SEV-SNP guest. It disables all hypervisor-based interrupt queuing and event injection of all vectors except a new exception vector, #HV (28), which is reserved for SNP guest use, but never generated by hardware. #HV is only allowed to be injected into VMSAs that execute with Restricted Injection. The guests running with the SNP restricted injection feature active limit the host to ringing a doorbell with a #HV exception. Define two fields in the #HV doorbell page: a pending event field, and an EOI assist. Create the structure definition for the #HV doorbell page as per GHCB specification. Co-developed-by: Thomas Lendacky Signed-off-by: Thomas Lendacky Signed-off-by: Melody Wang --- arch/x86/include/asm/svm.h | 33 +++++++++++++++++++++++++++++++++ 1 file changed, 33 insertions(+) diff --git a/arch/x86/include/asm/svm.h b/arch/x86/include/asm/svm.h index bcfeb5e7c0ed..9822b0b346ae 100644 --- a/arch/x86/include/asm/svm.h +++ b/arch/x86/include/asm/svm.h @@ -252,6 +252,39 @@ struct __attribute__ ((__packed__)) vmcb_control_area { #define SVM_TSC_RATIO_MAX 0x000000ffffffffffULL #define SVM_TSC_RATIO_DEFAULT 0x0100000000ULL +/* + * Hypervisor doorbell page: + * + * Used when Restricted Injection is enabled for a VM. One page in size that + * is shared between the guest and hypervisor to communicate exception and + * interrupt events. + */ +struct hvdb_events { + /* First 64 bytes of HV doorbell page defined in GHCB specification */ + union { + struct { + /* Non-maskable event indicators */ + u16 vector: 8, + nmi: 1, + mce: 1, + reserved2: 5, + no_further_signal: 1; + }; + + u16 pending_events; + }; + + u8 no_eoi_required; + + u8 reserved3[61]; +}; + +struct hvdb { + struct hvdb_events events; + + /* Remainder of the page is for software use */ + u8 reserved[PAGE_SIZE - sizeof(struct hvdb_events)]; +}; /* AVIC */ #define AVIC_LOGICAL_ID_ENTRY_GUEST_PHYSICAL_ID_MASK (0xFFULL) -- 2.43.0