x86/acpi: Dont invoke topology_register_apic() for XEN PV
The MADT table for XEN/PV dom0 is not really useful and registering the APICs is momentarily a pointless exercise because XENPV does not use an APIC at all. It overrides the x86_init.mpparse.parse_smp_config() callback, resets num_processors and counts how many of them are provided by the hypervisor. This is in the way of cleaning up the APIC registration. Prevent MADT registration for XEN/PV temporarily until the rework is completed and XEN/PV can use the MADT again. Signed-off-by: Thomas Gleixner <tglx@linutronix.de> Tested-by: Michael Kelley <mhklinux@outlook.com> Tested-by: Sohil Mehta <sohil.mehta@intel.com> Link: https://lore.kernel.org/r/20240213210251.885489468@linutronix.de
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@ -23,6 +23,8 @@
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#include <linux/serial_core.h>
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#include <linux/pgtable.h>
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#include <xen/xen.h>
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#include <asm/e820/api.h>
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#include <asm/irqdomain.h>
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#include <asm/pci_x86.h>
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@ -166,7 +168,8 @@ static int __init acpi_parse_madt(struct acpi_table_header *table)
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static __init void acpi_register_lapic(u32 apic_id, u32 acpi_id, bool present)
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{
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topology_register_apic(apic_id, acpi_id, present);
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if (!xen_pv_domain())
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topology_register_apic(apic_id, acpi_id, present);
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}
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static bool __init acpi_is_processor_usable(u32 lapic_flags)
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@ -1087,7 +1090,8 @@ static int __init early_acpi_parse_madt_lapic_addr_ovr(void)
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return count;
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}
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register_lapic_address(acpi_lapic_addr);
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if (!xen_pv_domain())
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register_lapic_address(acpi_lapic_addr);
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return count;
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}
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