x86/entry: Organise the clobbering of the RSB/RAS on entry to Xen

x86/entry: Organise the clobbering of the RSB/RAS on entry to Xen

ret instructions are speculated directly to values recorded in the Return
Stack Buffer/Return Address Stack, as there is no uncertainty in well-formed
code.  Guests can take advantage of this in two ways:

  1) If they can find a path in Xen which executes more ret instructions than
     call instructions.  (At least one in the waitqueue infrastructure,
     probably others.)

  2) Use the fact that the RSB/RAS in hardware is actually a circular stack
     without a concept of empty.  (When it logically empties, stale values
     will start being used.)

To mitigate, overwrite the RSB on entry to Xen with gadgets which will capture
and contain rogue speculation.

Signed-off-by: Andrew Cooper <andrew.cooper3@citrix.com>
Reviewed-by: Jan Beulich <jbeulich@suse.com>