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CpuMpPei will have to place the AP startup vector in memory under 1MB. For this, CpuMpPei borrows memory under 1MB, but it needs a memory resource descriptor HOB to exist there even on the S3 resume path (see the GetWakeupBuffer() function). Produce such a HOB as an exception on the S3 resume path. CpuMpPei is going be dispatched no earlier than PlatformPei, because CpuMpPei has a depex on gEfiPeiMemoryDiscoveredPpiGuid, and PlatformPei calls PublishSystemMemory(). Cc: Jeff Fan <jeff.fan@intel.com> Cc: Jordan Justen <jordan.l.justen@intel.com> Cc: Michael Kinney <michael.d.kinney@intel.com> Contributed-under: TianoCore Contribution Agreement 1.0 Signed-off-by: Laszlo Ersek <lersek@redhat.com> Reviewed-by: Jeff Fan <jeff.fan@intel.com> Reviewed-by: Jordan Justen <jordan.l.justen@intel.com>