This adds a new GED event called ACPI_GED_CPU_HOTPLUG_EVT. The basic workflow is that: GED sends this event to guest, then ACPI driver in guest will call _EVT method of GED aml, then _EVT will call CSCN method in cpus aml to get status of all cpus. The status of cpus is maintained by CPUHotplugState in GED and is made accessable to guest through memory region. This also adds migration support to CPUHotplugState. Signed-off-by: Keqian Zhu <zhukeqian1@huawei.com> Signed-off-by: Salil Mehta <salil.mehta@huawei.com> (cherry picked from commit a072cbe5beab53e9328c2fe6576e755e88b2c40a)
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