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X-OriginatorOrg: amd.com X-MS-Exchange-CrossTenant-OriginalArrivalTime: 11 Aug 2025 09:46:25.6711 (UTC) X-MS-Exchange-CrossTenant-Network-Message-Id: 3e77108c-03b8-4981-0a24-08ddd8bbf039 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: CH2PEPF00000142.namprd02.prod.outlook.com X-MS-Exchange-CrossTenant-AuthAs: Anonymous X-MS-Exchange-CrossTenant-FromEntityHeader: HybridOnPrem X-MS-Exchange-Transport-CrossTenantHeadersStamped: MW6PR12MB8899 Content-Type: text/plain; charset="utf-8" Initialize the APIC ID in the Secure AVIC APIC backing page with the APIC_ID msr value read from Hypervisor. CPU topology evaluation later during boot would catch and report any duplicate APIC ID for two CPUs. Reviewed-by: Tianyu Lan Signed-off-by: Neeraj Upadhyay --- Changes since v8: - Added Tianyu's Reviewed-by. - Code cleanup. arch/x86/kernel/apic/x2apic_savic.c | 6 ++++++ 1 file changed, 6 insertions(+) diff --git a/arch/x86/kernel/apic/x2apic_savic.c b/arch/x86/kernel/apic/x2a= pic_savic.c index 86a522685230..55edc6c30ba4 100644 --- a/arch/x86/kernel/apic/x2apic_savic.c +++ b/arch/x86/kernel/apic/x2apic_savic.c @@ -141,6 +141,12 @@ static void savic_setup(void) enum es_result res; unsigned long gpa; =20 + /* + * Before Secure AVIC is enabled, APIC msr reads are intercepted. + * APIC_ID msr read returns the value from the Hypervisor. + */ + apic_set_reg(ap, APIC_ID, native_apic_msr_read(APIC_ID)); + gpa =3D __pa(ap); =20 /* --=20 2.34.1