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that the virtual machine monitor has enabled machine check exceptions. Unfortunately, on AMD Family 10h processors the machine check hardware has a bug (Erratum 383) that can result in a false machine check exception when a superpage promotion occurs. Thus, I am disabling superpage promotion when the FreeBSD kernel is running as a guest operating system on an AMD Family 10h processor. Reviewed by: jhb, kib MFC after: 3 days