linux-kernel - [PATCH v5 0/3] x86/bugs: more BHI

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Date: Mon,  6 May 2024 22:30:03 -0700
From: Josh Poimboeuf <jpoimboe@...nel.org>
To: x86@...nel.org
Cc: linux-kernel@...r.kernel.org,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	Daniel Sneddon <daniel.sneddon@...ux.intel.com>,
	Pawan Gupta <pawan.kumar.gupta@...ux.intel.com>,
	Thomas Gleixner <tglx@...utronix.de>,
	Alexandre Chartre <alexandre.chartre@...cle.com>,
	Konrad Rzeszutek Wilk <konrad.wilk@...cle.com>,
	Peter Zijlstra <peterz@...radead.org>,
	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	Sean Christopherson <seanjc@...gle.com>,
	Andrew Cooper <andrew.cooper3@...rix.com>,
	Dave Hansen <dave.hansen@...ux.intel.com>,
	Nikolay Borisov <nik.borisov@...e.com>,
	KP Singh <kpsingh@...nel.org>,
	Waiman Long <longman@...hat.com>,
	Borislav Petkov <bp@...en8.de>,
	Ingo Molnar <mingo@...nel.org>
Subject: [PATCH v5 0/3] x86/bugs: more BHI

Patch 1 fixes some objtool warnings and enables noreturn-related
optimizations for direct-called syscall handlers.

Patches 2 and 3 add 'spectre_bhi=vmexit' which is useful for mitigating
BHI in cloud host environments.

v5:
- dropped syscall hardening patch for now
- dropped "Fix CPU mitigation defaults for !x86" in favor of Sean's fix
- patch 1 fixes (Paul)

Josh Poimboeuf (3):
  x86/syscall: Mark exit[_group] syscall handlers __noreturn
  x86/bugs: Remove duplicate Spectre cmdline option descriptions
  x86/bugs: Add 'spectre_bhi=vmexit' cmdline option

 Documentation/admin-guide/hw-vuln/spectre.rst | 84 ++-----------------
 .../admin-guide/kernel-parameters.txt         | 12 ++-
 arch/x86/entry/syscall_32.c                   | 10 ++-
 arch/x86/entry/syscall_64.c                   |  9 +-
 arch/x86/entry/syscall_x32.c                  |  7 +-
 arch/x86/entry/syscalls/syscall_32.tbl        |  6 +-
 arch/x86/entry/syscalls/syscall_64.tbl        |  6 +-
 arch/x86/kernel/cpu/bugs.c                    | 16 ++--
 arch/x86/um/sys_call_table_32.c               | 10 ++-
 arch/x86/um/sys_call_table_64.c               | 11 ++-
 scripts/syscalltbl.sh                         | 18 +++-
 tools/objtool/noreturns.h                     |  4 +
 12 files changed, 85 insertions(+), 108 deletions(-)

-- 
2.44.0