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Message-ID: <20230821112723.3995187-1-andrew.cooper3@citrix.com>
Date: Mon, 21 Aug 2023 12:27:19 +0100
From: Andrew Cooper <andrew.cooper3@...rix.com>
To: LKML <linux-kernel@...r.kernel.org>
CC: Andrew Cooper <andrew.cooper3@...rix.com>, <x86@...nel.org>,
"Borislav Petkov" <bp@...en8.de>,
Peter Zijlstra <peterz@...radead.org>,
Josh Poimboeuf <jpoimboe@...nel.org>,
Babu Moger <babu.moger@....com>, <David.Kaplan@....com>,
Nikolay Borisov <nik.borisov@...e.com>,
<gregkh@...uxfoundation.org>, Thomas Gleixner <tglx@...utronix.de>
Subject: [PATCH 0/4] x86/srso: Reduce overhead of the mitigation
The main point of this series is patch 4 to remove one taken branch from every
function return. Everything else is cleanup.
Patch 3 has an issue that sadly may invalidate this as a technique. Patch 4
needs some objtool whispering to fix.
Based on x86/urgent but I suspect this may want rebasing around other fixes in
flight.
Andrew Cooper (4):
x86/srso: Rename srso_alias_*() to srso_fam19_*()
x86/srso: Rename fam17 SRSO infrastructure to srso_fam17_*()
x86/ret-thunk: Support CALL-ing to the ret-thunk
x86/srso: Use CALL-based return thunks to reduce overhead
arch/x86/include/asm/nospec-branch.h | 9 ++--
arch/x86/kernel/alternative.c | 4 +-
arch/x86/kernel/cpu/bugs.c | 9 ++--
arch/x86/kernel/ftrace.c | 8 +--
arch/x86/kernel/static_call.c | 10 ++--
arch/x86/kernel/vmlinux.lds.S | 10 ++--
arch/x86/lib/retpoline.S | 75 ++++++++++++----------------
arch/x86/net/bpf_jit_comp.c | 5 +-
8 files changed, 67 insertions(+), 63 deletions(-)
base-commit: 6405b72e8d17bd1875a56ae52d23ec3cd51b9d66
--
2.30.2
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