x86/spec-ctrl: Protect against CALL/JMP straight-line speculation

Some x86 CPUs speculatively execute beyond indirect CALL/JMP instructions.

With CONFIG_INDIRECT_THUNK / Retpolines, indirect CALL/JMP instructions are
converted to direct CALL/JMP's to __x86_indirect_thunk_REG(), leaving just a
handful of indirect JMPs implementing those stubs.

There is no architectrual execution beyond an indirect JMP, so use INT3 as
recommended by vendors to halt speculative execution.  This is shorter than
LFENCE (which would also work fine), but also shows up in logs if we do
unexpected execute them.

Signed-off-by: Andrew Cooper <andrew.cooper3@citrix.com>
Reviewed-by: Jan Beulich <jbeulich@suse.com>
Release-acked-by: Paul Durrant <paul@xen.org>

xen/arch/x86/indirect-thunk.S

@@ -24,10 +24,12 @@
 .macro IND_THUNK_LFENCE reg:req
         lfence
         jmp *%\reg
+        int3 /* Halt straight-line speculation */
 .endm
 
 .macro IND_THUNK_JMP reg:req
         jmp *%\reg
+        int3 /* Halt straight-line speculation */
 .endm
 
 /*