Tyche AP Boot Failure on Linux v6.5+

[YuChen-Qian]

Linux v6.5 causes the AP to directly generate a triple fault when we enable SMP on x86. A bisect shows Linux started to support parallel startup of secondary CPUs, which might causes an issue with the current ACPI mailbox mechanism. Some of the problematic commits are:

• 8b5a0f95 x86/smpboot: Enable split CPU startup
• f6f1ae91 x86/smpboot: Implement a bit spinlock to protect the realmode stack
• 7e75178a x86/smpboot: Support parallel startup of secondary CPUs
• 0c7ffa32 x86/smpboot/64: Implement arch_cpuhp_init_parallel_bringup() and enable it

I log this issue here and we should fix this issue if we have time. Since we have merged all of the guest-side patches back to v6.2, this does not create an immediate problem.