x86/hw_breakpoint: Prevent data breakpoints on cpu_entry_area

A data breakpoint near the top of an IST stack will cause unrecoverable
recursion.  A data breakpoint on the GDT, IDT, or TSS is terrifying.
Prevent either of these from happening.

Co-developed-by: Peter Zijlstra <[email protected]>
Signed-off-by: Andy Lutomirski <[email protected]>
Signed-off-by: Peter Zijlstra (Intel) <[email protected]>
Signed-off-by: Thomas Gleixner <[email protected]>
Reviewed-by: Borislav Petkov <[email protected]>
Reviewed-by: Lai Jiangshan <[email protected]>
Reviewed-by: Alexandre Chartre <[email protected]>
Link: https://lkml.kernel.org/r/[email protected]

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