Commit 45e2cef5 authored by Neeraj Upadhyay's avatar Neeraj Upadhyay Committed by Borislav Petkov (AMD)
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x86/apic: Initialize APIC ID for Secure AVIC 



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: default avatarNeeraj Upadhyay <Neeraj.Upadhyay@amd.com>
Signed-off-by: default avatarBorislav Petkov (AMD) <bp@alien8.de>
Reviewed-by: default avatarTianyu Lan <tiala@microsoft.com>
Link: https://lore.kernel.org/20250828110255.208779-2-Neeraj.Upadhyay@amd.com
parent c822f58a

arch/x86/kernel/apic/x2apic_savic.c

+6 −0
Original line number Diff line number Diff line
@@ -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);



	/*