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2024-05-10 10ebd8556b7990499c896a550e3d416b444211e6

 kernel/drivers/acpi/processor_pdc.c
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@@ -14,6 +14,8 @@
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 #include <linux/acpi.h>
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 #include <acpi/processor.h>
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+#include <xen/xen.h>
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+
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 #include "internal.h"
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 #define _COMPONENT              ACPI_PROCESSOR_COMPONENT
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@@ -50,6 +52,15 @@
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 		return false;
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 	}
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+	if (xen_initial_domain())
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+		/*
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+		 * When running as a Xen dom0 the number of processors Linux
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+		 * sees can be different from the real number of processors on
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+		 * the system, and we still need to execute _PDC for all of
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+		 * them.
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+		 */
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+		return xen_processor_present(acpi_id);
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+
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 	type = (acpi_type == ACPI_TYPE_DEVICE) ? 1 : 0;
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 	cpuid = acpi_get_cpuid(handle, type, acpi_id);
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