x86/Documentation: Add PTI description

Add some details about how PTI works, what some of the downsides
are, and how to debug it when things go wrong.

Also document the kernel parameter: 'pti/nopti'.

Signed-off-by: Dave Hansen <[email protected]>
Signed-off-by: Thomas Gleixner <[email protected]>
Reviewed-by: Randy Dunlap <[email protected]>
Reviewed-by: Kees Cook <[email protected]>
Cc: Moritz Lipp <[email protected]>
Cc: Daniel Gruss <[email protected]>
Cc: Michael Schwarz <[email protected]>
Cc: Richard Fellner <[email protected]>
Cc: Andy Lutomirski <[email protected]>
Cc: Linus Torvalds <[email protected]>
Cc: Hugh Dickins <[email protected]>
Cc: Andi Lutomirsky <[email protected]>
Cc: [email protected]
Link: https://lkml.kernel.org/r/[email protected]

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