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e67f405713
Today, CpuMpPei and CpuDxe only initialize separate exception stacks for the APs when PcdCpuStackGuard is enabled so that if a stack overflow occurs, hitting the guard page, the exception can be handler with a separate stack. However, this operation also creates a separate GDT for each AP. This is a safer option than all APs sharing the BSP's GDT because there are issues with concurrent access to the structures contained within. Furthermore, even when a stack guard page is not present, stack overflows can still occur and corrupt the stack; if an exception is taken here, it is still valuable to have a separate exception stack for sanity. This commit updates CpuMpPei and CpuDxe to always create separate exception stacks for the APs (and therefore separate GDTs). Signed-off-by: Oliver Smith-Denny <osde@microsoft.com>