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x86/apic: Initialize APIC ID for Secure AVIC

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Initialize the APIC ID in the Secure AVIC APIC backing page with the APIC_ID
MSR value read from the hypervisor. CPU topology evaluation later during boot
would catch and report any duplicate APIC ID for two CPUs.

Signed-off-by: Neeraj Upadhyay <Neeraj.Upadhyay@amd.com>
Signed-off-by: Borislav Petkov (AMD) <bp@alien8.de>
Reviewed-by: Tianyu Lan <tiala@microsoft.com>
Link: https://lore.kernel.org/20250828110255.208779-2-Neeraj.Upadhyay@amd.com
This commit is contained in:
Neeraj Upadhyay 2025-08-28 16:32:41 +05:30 committed by Borislav Petkov (AMD)
parent c822f58a4f
commit 45e2cef568
1 changed files with 6 additions and 0 deletions
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6
arch/x86/kernel/apic/x2apic_savic.c
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@ -150,6 +150,12 @@ static void savic_setup(void)
enum es_result res;
unsigned long gpa;
/*
* 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 = __pa(ap);
/*