From: Peter Zijlstra <peterz@infradead.org>
To: David Woodhouse <dwmw2@infradead.org>,
Josh Poimboeuf <jpoimboe@redhat.com>
Cc: linux-kernel@vger.kernel.org, Dave Hansen <dave.hansen@intel.com>,
Ashok Raj <ashok.raj@intel.com>,
Thomas Gleixner <tglx@linutronix.de>,
Tim Chen <tim.c.chen@linux.intel.com>,
Andy Lutomirski <luto@kernel.org>,
Linus Torvalds <torvalds@linux-foundation.org>,
Greg KH <gregkh@linuxfoundation.org>,
Andrea Arcangeli <aarcange@redhat.com>,
Andi Kleen <ak@linux.intel.com>,
Arjan Van De Ven <arjan.van.de.ven@intel.com>,
Dan Williams <dan.j.williams@intel.com>,
Paolo Bonzini <pbonzini@redhat.com>,
Jun Nakajima <jun.nakajima@intel.com>,
Asit Mallick <asit.k.mallick@intel.com>,
Peter Zijlstra <peterz@infradead.org>
Subject: [PATCH v2 09/10] x86: Annotate dynamic jump in head_64.S
Date: Tue, 16 Jan 2018 15:28:34 +0100 [thread overview]
Message-ID: <20180116143241.416586568@infradead.org> (raw)
In-Reply-To: 20180116142825.376986833@infradead.org
[-- Attachment #1: peterz-objtool-retpoline-annotate.patch --]
[-- Type: text/plain, Size: 601 bytes --]
The objtool retpoline validation found this indirect jump. Seeing how
its on CPU bringup before we run userspace it should be safe, annotate
it.
Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
---
arch/x86/kernel/head_64.S | 5 ++++-
1 file changed, 4 insertions(+), 1 deletion(-)
--- a/arch/x86/kernel/head_64.S
+++ b/arch/x86/kernel/head_64.S
@@ -134,7 +134,10 @@ ENTRY(secondary_startup_64)
/* Ensure I am executing from virtual addresses */
movq $1f, %rax
- jmp *%rax
+2: jmp *%rax
+ .pushsection .discard.retpoline_safe
+ .quad 2b
+ .popsection
1:
UNWIND_HINT_EMPTY
next prev parent reply other threads:[~2018-01-16 14:37 UTC|newest]
Thread overview: 34+ messages / expand[flat|nested] mbox.gz Atom feed top
2018-01-16 14:28 [PATCH v2 00/10] objtool validation of static branches and retpoline Peter Zijlstra
2018-01-16 14:28 ` [PATCH v2 01/10] x86: Reindent _static_cpu_has Peter Zijlstra
2018-01-16 15:48 ` Borislav Petkov
2018-01-16 14:28 ` [PATCH v2 02/10] x86: Update _static_cpu_has to use all named variables Peter Zijlstra
2018-01-18 11:21 ` Borislav Petkov
2018-01-18 15:09 ` Peter Zijlstra
2018-01-18 15:24 ` Borislav Petkov
2018-01-16 14:28 ` [PATCH v2 03/10] x86: Add a type field to alt_instr Peter Zijlstra
2018-01-16 22:49 ` Josh Poimboeuf
2018-01-16 22:53 ` Borislav Petkov
2018-01-16 23:06 ` Josh Poimboeuf
2018-01-18 11:32 ` Borislav Petkov
2018-01-16 14:28 ` [PATCH v2 04/10] objtool: Implement base jump_assert support Peter Zijlstra
2018-01-16 14:28 ` [PATCH v2 05/10] x86: Annotate static_cpu_has alternative Peter Zijlstra
2018-01-18 13:15 ` Borislav Petkov
2018-01-16 14:28 ` [PATCH v2 06/10] objtool: Implement jump_assert for _static_cpu_has() Peter Zijlstra
2018-01-16 23:02 ` Josh Poimboeuf
2018-01-17 9:19 ` Peter Zijlstra
2018-01-17 14:27 ` Josh Poimboeuf
2018-01-17 14:30 ` Josh Poimboeuf
2018-01-17 16:30 ` Peter Zijlstra
2018-01-16 14:28 ` [PATCH v2 07/10] x86/jump_label: Implement arch_static_assert() Peter Zijlstra
2018-01-18 13:33 ` Borislav Petkov
2018-01-18 15:31 ` Peter Zijlstra
2018-01-16 14:28 ` [PATCH v2 08/10] objtool: Add retpoline validation Peter Zijlstra
2018-01-16 14:28 ` Peter Zijlstra [this message]
2018-01-16 14:28 ` [PATCH v2 10/10] objtool: More complex static jump implementation Peter Zijlstra
2018-01-16 15:20 ` Peter Zijlstra
2018-01-17 3:05 ` Josh Poimboeuf
2018-01-17 8:18 ` Peter Zijlstra
2018-01-16 19:49 ` [PATCH v2 11/10] objtool: Even more complex static block checks Peter Zijlstra
2018-01-17 3:12 ` Josh Poimboeuf
2018-01-17 8:13 ` Peter Zijlstra
2018-01-17 14:13 ` Josh Poimboeuf
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