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X-OriginatorOrg: amd.com X-MS-Exchange-CrossTenant-OriginalArrivalTime: 01 Apr 2025 11:37:48.4741 (UTC) X-MS-Exchange-CrossTenant-Network-Message-Id: 950f4fc9-f800-446c-80d1-08dd7111a104 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: CO1PEPF000044F7.namprd21.prod.outlook.com X-MS-Exchange-CrossTenant-AuthAs: Anonymous X-MS-Exchange-CrossTenant-FromEntityHeader: HybridOnPrem X-MS-Exchange-Transport-CrossTenantHeadersStamped: IA1PR12MB9061 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. Signed-off-by: Neeraj Upadhyay --- Changes since v2: - Drop duplicate APIC ID checks. arch/x86/kernel/apic/x2apic_savic.c | 13 +++++++++++++ 1 file changed, 13 insertions(+) diff --git a/arch/x86/kernel/apic/x2apic_savic.c b/arch/x86/kernel/apic/x2a= pic_savic.c index f1dd74724769..21f7c055995e 100644 --- a/arch/x86/kernel/apic/x2apic_savic.c +++ b/arch/x86/kernel/apic/x2apic_savic.c @@ -185,12 +185,25 @@ static void x2apic_savic_send_ipi_mask_allbutself(con= st struct cpumask *mask, in __send_ipi_mask(mask, vector, true); } =20 +static void init_apic_page(void) +{ + u32 apic_id; + + /* + * Before Secure AVIC is enabled, APIC msr reads are intercepted. + * APIC_ID msr read returns the value from the Hypervisor. + */ + apic_id =3D native_apic_msr_read(APIC_ID); + set_reg(APIC_ID, apic_id); +} + static void x2apic_savic_setup(void) { void *backing_page; enum es_result ret; unsigned long gpa; =20 + init_apic_page(); backing_page =3D this_cpu_ptr(apic_page); gpa =3D __pa(backing_page); =20 --=20 2.34.1