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2024-02-20 ea08eeccae9297f7aabd2ef7f0c2517ac4549acc

 kernel/drivers/xen/pcpu.c
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@@ -58,6 +58,7 @@
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 	struct list_head list;
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 	struct device dev;
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 	uint32_t cpu_id;
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+	uint32_t acpi_id;
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 	uint32_t flags;
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 };
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@@ -249,6 +250,7 @@
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 	INIT_LIST_HEAD(&pcpu->list);
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 	pcpu->cpu_id = info->xen_cpuid;
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+	pcpu->acpi_id = info->acpi_id;
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 	pcpu->flags = info->flags;
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 	/* Need hold on xen_pcpu_lock before pcpu list manipulations */
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@@ -416,3 +418,21 @@
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 	return ret;
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 }
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 arch_initcall(xen_pcpu_init);
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+
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+#ifdef CONFIG_ACPI
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+bool __init xen_processor_present(uint32_t acpi_id)
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+{
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+	const struct pcpu *pcpu;
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+	bool online = false;
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+
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+	mutex_lock(&xen_pcpu_lock);
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+	list_for_each_entry(pcpu, &xen_pcpus, list)
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+		if (pcpu->acpi_id == acpi_id) {
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+			online = pcpu->flags & XEN_PCPU_FLAGS_ONLINE;
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+			break;
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+		}
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+	mutex_unlock(&xen_pcpu_lock);
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+
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+	return online;
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+}
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+#endif