Peter Zijlstra 7508500900 x86/alternative: Implement .retpoline_sites support ... Rewrite retpoline thunk call sites to be indirect calls for spectre_v2=off. This ensures spectre_v2=off is as near to a RETPOLINE=n build as possible. This is the replacement for objtool writing alternative entries to ensure the same and achieves feature-parity with the previous approach. One noteworthy feature is that it relies on the thunks to be in machine order to compute the register index. Specifically, this does not yet address the Jcc __x86_indirect_thunk_* calls generated by clang, a future patch will add this. Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org> Reviewed-by: Borislav Petkov <bp@suse.de> Acked-by: Josh Poimboeuf <jpoimboe@redhat.com> Tested-by: Alexei Starovoitov <ast@kernel.org> Link: https://lore.kernel.org/r/20211026120310.232495794@infradead.org		2021-10-28 23:25:27 +02:00
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asm	x86/alternative: Implement .retpoline_sites support	2021-10-28 23:25:27 +02:00
uapi/asm	KVM: x86: implement KVM_GUESTDBG_BLOCKIRQ	2021-08-20 16:06:37 -04:00