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x86/alternative: Add debug prints to apply_retpolines()
commit d4b5a5c993
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@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
Signed-off-by: Thadeu Lima de Souza Cascardo <cascardo@canonical.com>
Signed-off-by: Ben Hutchings <ben@decadent.org.uk>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
parent
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1 changed files with 6 additions and 0 deletions
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@ -647,9 +647,15 @@ 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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