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[PATCH v2 05/24] xen/arm: Map populated CPUs to their respective NUMA nodes
- To: xen-devel@xxxxxxxxxxxxxxxxxxxx
- From: Hirokazu Takahashi <taka@xxxxxxxxxxxxx>
- Date: Mon, 1 Jun 2026 07:47:35 +0900
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- Cc: Hirokazu Takahashi <taka@xxxxxxxxxxxxx>, Stefano Stabellini <sstabellini@xxxxxxxxxx>, Julien Grall <julien@xxxxxxx>, Bertrand Marquis <bertrand.marquis@xxxxxxx>, Michal Orzel <michal.orzel@xxxxxxx>, Volodymyr Babchuk <Volodymyr_Babchuk@xxxxxxxx>
- Delivery-date: Sun, 31 May 2026 22:48:23 +0000
- List-id: Xen developer discussion <xen-devel.lists.xenproject.org>
Map the populated CPUs to their respective NUMA nodes. The NUMA
node ID for each CPU is retrieved from the Device Tree.
---
xen/arch/arm/smpboot.c | 17 +++++++++++++++++
1 file changed, 17 insertions(+)
diff --git a/xen/arch/arm/smpboot.c b/xen/arch/arm/smpboot.c
index d1651fe7dd..eafa195504 100644
--- a/xen/arch/arm/smpboot.c
+++ b/xen/arch/arm/smpboot.c
@@ -133,6 +133,9 @@ static void __init dt_smp_init_cpus(void)
};
bool bootcpu_valid = false;
int rc;
+#ifdef CONFIG_DEVICE_TREE_NUMA
+ nodeid_t cpu_to_numa[NR_CPUS];
+#endif /* CONFIG_DEVICE_TREE_NUMA */
mpidr = system_cpuinfo.mpidr.bits & MPIDR_HWID_MASK;
@@ -244,6 +247,16 @@ static void __init dt_smp_init_cpus(void)
}
else
tmp_map[i] = hwid;
+
+#ifdef CONFIG_DEVICE_TREE_NUMA
+ if ( tmp_map[i] != MPIDR_INVALID )
+ {
+ uint32_t nid;
+ if ( numa_disabled() || !dt_property_read_u32(cpu, "numa-node-id",
&nid) )
+ nid = 0U; /* default node */
+ cpu_to_numa[i] = nid >= MAX_NUMNODES ? 0U : nid;
+ }
+#endif /* CONFIG_DEVICE_TREE_NUMA */
}
if ( !bootcpu_valid )
@@ -259,6 +272,10 @@ static void __init dt_smp_init_cpus(void)
continue;
cpumask_set_cpu(i, &cpu_possible_map);
cpu_logical_map(i) = tmp_map[i];
+#ifdef CONFIG_DEVICE_TREE_NUMA
+ numa_set_node(i, cpu_to_numa[i]);
+ numa_add_cpu(i);
+#endif /* CONFIG_DEVICE_TREE_NUMA */
}
}
--
2.43.0
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