x86/bugs: Enable STIBP for JMP2RET
For untrained return thunks to be fully effective, STIBP must be enabled or SMT disabled. Co-developed-by: NJosh Poimboeuf <jpoimboe@redhat.com> Signed-off-by: NJosh Poimboeuf <jpoimboe@redhat.com> Signed-off-by: NKim Phillips <kim.phillips@amd.com> Signed-off-by: NPeter Zijlstra (Intel) <peterz@infradead.org> Signed-off-by: NBorislav Petkov <bp@suse.de>
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