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x86/alternative: Add debug prints to apply_retpolines()
Make sure we can see the text changes when booting with 'debug-alternative'. Example output: [ ] SMP alternatives: retpoline at: __traceiter_initcall_level+0x1f/0x30 (ffffffff8100066f) len: 5 to: __x86_indirect_thunk_rax+0x0/0x20 [ ] SMP alternatives: ffffffff82603e58: [2:5) optimized NOPs: ff d0 0f 1f 00 [ ] SMP alternatives: ffffffff8100066f: orig: e8 cc 30 00 01 [ ] SMP alternatives: ffffffff8100066f: repl: ff d0 0f 1f 00 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/20211026120310.422273830@infradead.org
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@ -492,9 +492,15 @@ void __init_or_module noinline apply_retpolines(s32 *start, s32 *end)
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continue;
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}
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DPRINTK("retpoline at: %pS (%px) len: %d to: %pS",
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addr, addr, insn.length,
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addr + insn.length + insn.immediate.value);
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len = patch_retpoline(addr, &insn, bytes);
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if (len == insn.length) {
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optimize_nops(bytes, len);
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DUMP_BYTES(((u8*)addr), len, "%px: orig: ", addr);
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DUMP_BYTES(((u8*)bytes), len, "%px: repl: ", addr);
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text_poke_early(addr, bytes, len);
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}
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}
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