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x86/cpu/topology: Reject unknown APIC IDs on ACPI hotplug

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The topology bitmaps track all possible APIC IDs which have been registered
during enumeration. As sizing and further topology information is going to
be derived from these bitmaps, reject attempts to hotplug an APIC ID which
was not registered during enumeration.

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/20240213210252.462231229@linutronix.de
This commit is contained in:
Thomas Gleixner
2024-02-13 22:05:57 +01:00
parent f1f758a805
commit 7cdcdab1a6
1 changed files with 4 additions and 0 deletions
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4
arch/x86/kernel/cpu/topology.c
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@@ -272,6 +272,10 @@ int topology_hotplug_apic(u32 apic_id, u32 acpi_id)
if (apic_id >= MAX_LOCAL_APIC)
return -EINVAL;
/* Reject if the APIC ID was not registered during enumeration. */
if (!test_bit(apic_id, apic_maps[TOPO_SMT_DOMAIN].map))
return -ENODEV;
cpu = topo_lookup_cpuid(apic_id);
if (cpu < 0) {
if (topo_info.nr_assigned_cpus >= nr_cpu_ids)