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Date: Fri, 22 Jul 2022 11:10:52 +0200 From: Greg Kroah-Hartman <gregkh@...uxfoundation.org> To: linux-kernel@...r.kernel.org Cc: Greg Kroah-Hartman <gregkh@...uxfoundation.org>, stable@...r.kernel.org, "Peter Zijlstra (Intel)" <peterz@...radead.org>, Borislav Petkov <bp@...e.de>, Josh Poimboeuf <jpoimboe@...hat.com>, Alexei Starovoitov <ast@...nel.org>, Thadeu Lima de Souza Cascardo <cascardo@...onical.com> Subject: [PATCH 5.15 18/89] x86/alternative: Add debug prints to apply_retpolines() From: Peter Zijlstra <peterz@...radead.org> commit d4b5a5c993009ffeb5febe3b701da3faab6adb96 upstream. 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@...radead.org> Reviewed-by: Borislav Petkov <bp@...e.de> Acked-by: Josh Poimboeuf <jpoimboe@...hat.com> Tested-by: Alexei Starovoitov <ast@...nel.org> Link: https://lore.kernel.org/r/20211026120310.422273830@infradead.org Signed-off-by: Thadeu Lima de Souza Cascardo <cascardo@...onical.com> Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org> --- arch/x86/kernel/alternative.c | 6 ++++++ 1 file changed, 6 insertions(+) --- a/arch/x86/kernel/alternative.c +++ b/arch/x86/kernel/alternative.c @@ -492,9 +492,15 @@ void __init_or_module noinline apply_ret continue; } + DPRINTK("retpoline at: %pS (%px) len: %d to: %pS", + addr, addr, insn.length, + addr + insn.length + insn.immediate.value); + len = patch_retpoline(addr, &insn, bytes); if (len == insn.length) { optimize_nops(bytes, len); + DUMP_BYTES(((u8*)addr), len, "%px: orig: ", addr); + DUMP_BYTES(((u8*)bytes), len, "%px: repl: ", addr); text_poke_early(addr, bytes, len); } }
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