default or selected kernelversion does not have config value CONFIG_XEN_ACPI_HOTPLUG_MEMORY.
Result is shown for kernelversion 6.9.9
Xen ACPI memory hotplug
modulename: xen-acpi-memhotplug.ko
configname: CONFIG_XEN_ACPI_HOTPLUG_MEMORY
Linux Kernel Configuration
└─>Device Drivers
└─>Xen driver support
└─>Xen ACPI memory hotplug
In linux kernel since version 3.1 (release Date: 2011-10-24)
This is Xen ACPI memory hotplug.
Currently Xen only support ACPI memory hot-add. If you want
to hot-add memory at runtime (the hot-added memory cannot be
removed until machine stop), select Y/M here, otherwise select N.
Currently Xen only support ACPI memory hot-add. If you want
to hot-add memory at runtime (the hot-added memory cannot be
removed until machine stop), select Y/M here, otherwise select N.