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| author | Peter Zijlstra <peterz@infradead.org> | 2021-10-26 14:01:45 +0200 |
|---|---|---|
| committer | Peter Zijlstra <peterz@infradead.org> | 2021-10-28 23:25:28 +0200 |
| commit | d4b5a5c993009ffeb5febe3b701da3faab6adb96 (patch) | |
| tree | e4c5c6d2466b95f926519e69a9756da9c3f6a802 /arch/x86/kernel/alternative.c | |
| parent | bbe2df3f6b6da7848398d55b1311d58a16ec21e4 (diff) | |
| download | linux-d4b5a5c993009ffeb5febe3b701da3faab6adb96.tar.bz2 | |
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
Diffstat (limited to 'arch/x86/kernel/alternative.c')
| -rw-r--r-- | arch/x86/kernel/alternative.c | 6 |
1 files changed, 6 insertions, 0 deletions
diff --git a/arch/x86/kernel/alternative.c b/arch/x86/kernel/alternative.c index c89824c69ff7..23fb4d51a5da 100644 --- a/arch/x86/kernel/alternative.c +++ b/arch/x86/kernel/alternative.c @@ -492,9 +492,15 @@ void __init_or_module noinline apply_retpolines(s32 *start, s32 *end) 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); } } |