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X-OriginatorOrg: amd.com X-MS-Exchange-CrossTenant-OriginalArrivalTime: 09 Jul 2025 03:39:27.8461 (UTC) X-MS-Exchange-CrossTenant-Network-Message-Id: d972781a-cc11-46dc-7de5-08ddbe9a34f0 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: BL6PEPF0001AB51.namprd04.prod.outlook.com X-MS-Exchange-CrossTenant-AuthAs: Anonymous X-MS-Exchange-CrossTenant-FromEntityHeader: HybridOnPrem X-MS-Exchange-Transport-CrossTenantHeadersStamped: DM4PR12MB5913 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 v7: - No change. 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/x2apic_savic.c index 186e69a5e169..618643e7242f 100644 --- a/arch/x86/kernel/apic/x2apic_savic.c +++ b/arch/x86/kernel/apic/x2apic_savic.c @@ -131,6 +131,18 @@ static void savic_write(u32 reg, u32 data) } } +static void init_apic_page(struct apic_page *ap) +{ + 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 = native_apic_msr_read(APIC_ID); + apic_set_reg(ap, APIC_ID, apic_id); +} + static void savic_setup(void) { void *backing_page; @@ -138,6 +150,7 @@ static void savic_setup(void) unsigned long gpa; backing_page = this_cpu_ptr(apic_page); + init_apic_page(backing_page); gpa = __pa(backing_page); /* -- 2.34.1