From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from smtp.kernel.org (aws-us-west-2-korg-mail-1.web.codeaurora.org [10.30.226.201]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 16E8E1CFBC for ; Tue, 7 May 2024 05:30:14 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=10.30.226.201 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1715059815; cv=none; b=eBcPF3/dc79VNawCjbm5IvLV3wq/yry3aqKYlA7rRBf7WK1vAwXOGMDA6GENYBorDye3MyTwMKPoWBt81dazJm5+CX3i9yE0Q5039ACdau46zXS5DxaDKy9/THRiF5EjLlcJ8YHbkBLAxWKJsBuTIjggkCA7UFLXKSQzuzEoYek= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1715059815; c=relaxed/simple; bh=/OIeRmlA5blBquQJqBcAtSfI12fTrX9XkSqriyuCZBQ=; h=From:To:Cc:Subject:Date:Message-ID:MIME-Version; b=br+ul+e9QPDZXP/oY1JyI63jV8xq3ij4kXlIUY+59d91qRnff6Z5vTWXsOuyKLoiYQX9gT0QjxB9cb9VFDjuaGYz+ooh9Jm0SJOaA5GHoy3YolSy4X3YTVvf5D4yo2yFTVuL8g1O3WWxzmVftRKZXbXgr/XKtdpzk0Z9T+CSMEo= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b=EtaSWS1+; arc=none smtp.client-ip=10.30.226.201 Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b="EtaSWS1+" Received: by smtp.kernel.org (Postfix) with ESMTPSA id 007ACC2BBFC; Tue, 7 May 2024 05:30:13 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1715059814; bh=/OIeRmlA5blBquQJqBcAtSfI12fTrX9XkSqriyuCZBQ=; h=From:To:Cc:Subject:Date:From; b=EtaSWS1+8hYdYOy90Daws4v9hCkIfg7DuEPL6o6Iu2KCMBN4xtiHqJtj1ru/6Yc6q FNnXD1dOmkB449WLf5Q286w8lT4Uz0zEvQ+kK6hWdH5OY2EIB0VDfkll2ZmV6Nnejm Zmo55V5EuOjrmsvshnoN7M2LeFtS0yb/l14MQFO6zYkJlo4pi9df82GHICirf3BK34 ptA5gQExvsHSSgoMNUqIO0MlQ5doHKuYmfiECcpM1/hMQiY6QSJ7dWPBZh5arzP3ir CxTGPyqVFsC5p1H6+7aY1Ucd+GRIlKy25VQ5tMqAwRaw5wbuQOKGrxA/XK3pl78COy dXQvztvfZgMGw== From: Josh Poimboeuf To: x86@kernel.org Cc: linux-kernel@vger.kernel.org, Linus Torvalds , Daniel Sneddon , Pawan Gupta , Thomas Gleixner , Alexandre Chartre , Konrad Rzeszutek Wilk , Peter Zijlstra , Greg Kroah-Hartman , Sean Christopherson , Andrew Cooper , Dave Hansen , Nikolay Borisov , KP Singh , Waiman Long , Borislav Petkov , Ingo Molnar Subject: [PATCH v5 0/3] x86/bugs: more BHI Date: Mon, 6 May 2024 22:30:03 -0700 Message-ID: X-Mailer: git-send-email 2.44.0 Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit 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