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x86/xen: mark boot CPU of PV guest in MSR_IA32_APICBASE

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Recent topology checks of the x86 boot code uncovered the need for
PV guests to have the boot cpu marked in the APICBASE MSR.

Fixes: 9d22c96316 ("x86/topology: Handle bogus ACPI tables correctly")
Reported-by: Niels Dettenbach <nd@syndicat.com>
Signed-off-by: Juergen Gross <jgross@suse.com>
Reviewed-by: Thomas Gleixner <tglx@linutronix.de>
Signed-off-by: Juergen Gross <jgross@suse.com>
This commit is contained in:
Juergen Gross 2024-10-04 12:22:12 +02:00
parent 9af48210ea
commit bf56c41016
1 changed files with 4 additions and 0 deletions
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4
arch/x86/xen/enlighten_pv.c
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@ -1032,6 +1032,10 @@ static u64 xen_do_read_msr(unsigned int msr, int *err)
switch (msr) { switch (msr) {
case MSR_IA32_APICBASE: case MSR_IA32_APICBASE:
val &= ~X2APIC_ENABLE; val &= ~X2APIC_ENABLE;
if (smp_processor_id() == 0)
val |= MSR_IA32_APICBASE_BSP;
else
val &= ~MSR_IA32_APICBASE_BSP;
break; break;
} }
return val; return val;