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X-OriginatorOrg: amd.com X-MS-Exchange-CrossTenant-OriginalArrivalTime: 14 Oct 2025 19:44:13.2469 (UTC) X-MS-Exchange-CrossTenant-Network-Message-Id: c60697ca-b574-4b2b-094e-08de0b5a0d68 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: SN1PEPF00026368.namprd02.prod.outlook.com X-MS-Exchange-CrossTenant-AuthAs: Anonymous X-MS-Exchange-CrossTenant-FromEntityHeader: HybridOnPrem X-MS-Exchange-Transport-CrossTenantHeadersStamped: LV8PR12MB9205 For shadow stack support in SVM when using SEV-ES, the guest kernel needs to save XSS to the GHCB in order for the hypervisor to determine the XSAVES save area size. --- v4: - Use CPUID_LEAF_XSTATE instead of open coding 0xd. v3: - Only CPUID.0xD.1 consumes XSS. Limit including XSS in GHCB for this case. v2: - Update changelog for patch 2/2 John Allen (2): x86/boot: Move boot_*msr helpers to asm/shared/msr.h x86/sev-es: Include XSS value in GHCB CPUID request arch/x86/boot/compressed/sev.c | 7 ++++--- arch/x86/boot/compressed/sev.h | 6 +++--- arch/x86/boot/cpucheck.c | 16 ++++++++-------- arch/x86/boot/msr.h | 26 -------------------------- arch/x86/coco/sev/vc-shared.c | 13 +++++++++++++ arch/x86/include/asm/shared/msr.h | 15 +++++++++++++++ arch/x86/include/asm/svm.h | 1 + 7 files changed, 44 insertions(+), 40 deletions(-) delete mode 100644 arch/x86/boot/msr.h -- 2.47.3