Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1753363AbdIFVhG (ORCPT ); Wed, 6 Sep 2017 17:37:06 -0400 Received: from mail.kernel.org ([198.145.29.99]:50058 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1753158AbdIFVhF (ORCPT ); Wed, 6 Sep 2017 17:37:05 -0400 DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org 4AED721A95 Authentication-Results: mail.kernel.org; dmarc=none (p=none dis=none) header.from=kernel.org Authentication-Results: mail.kernel.org; spf=none smtp.mailfrom=luto@kernel.org From: Andy Lutomirski To: x86@kernel.org Cc: linux-kernel@vger.kernel.org, Borislav Petkov , Brian Gerst , Andrew Cooper , Juergen Gross , Boris Ostrovsky , Kees Cook , Andy Lutomirski Subject: [RFC 00/17] Pile o' entry stack changes Date: Wed, 6 Sep 2017 14:36:45 -0700 Message-Id: X-Mailer: git-send-email 2.13.5 Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 2800 Lines: 64 Hi all- Here's a pile of entry changes. In brief summary: - Lots of people (Linus included) have asked to convert the entry code to pop registers on exit instead of movqing them off the stack. This makes a bunch of progress in that direction. - Linux's sp0 handling has annoyed me for a while. We have thread_struct::sp0, which never made much sense to me. This series removes it on x86_64 and removes most references on x86_32. - Xen PV's cpuinit code did incomprehensible things with stack pointers. This makes it comprehensible. Juergen, this needs a bit of help on Xen -- see the NMI patch for details. Reviews would be appreciated :) Andy Lutomirski (17): x86/asm/64: Remove the restore_c_regs_and_iret label x86/asm/64: Split the iret-to-user and iret-to-kernel paths x86/asm/64: Move SWAPGS into the common iret-to-usermode path x86/asm/64: Simplify reg restore code in the standard IRET paths x86/asm/64: Shrink paranoid_exit_restore and make labels local x86/asm/64: Use pop instead of movq in syscall_return_via_sysret x86/asm/64: Merge the fast and slow SYSRET paths x86/asm/64: De-Xen-ify our NMI code x86/asm/32: Pull MSR_IA32_SYSENTER_CS update code out of native_load_sp0() x86/asm/64: Pass sp0 directly to load_sp0() x86/asm: Add task_top_of_stack() to find the top of a task's stack x86/xen/64: Clean up SP code in cpu_initialize_context() x86/boot/64: Stop initializing TSS.sp0 at boot x86/asm/64: Remove all remaining direct thread_struct::sp0 reads x86/boot/32: Fix cpu_current_top_of_stack initialization at boot x86/asm/64: Remove thread_struct::sp0 x86/traps: Use a new on_thread_stack() helper to clean up an assertion arch/x86/entry/calling.h | 9 +++ arch/x86/entry/entry_64.S | 133 ++++++++++++++++++---------------- arch/x86/entry/entry_64_compat.S | 3 +- arch/x86/include/asm/compat.h | 1 + arch/x86/include/asm/paravirt.h | 5 +- arch/x86/include/asm/paravirt_types.h | 2 +- arch/x86/include/asm/processor.h | 68 +++++++++-------- arch/x86/include/asm/switch_to.h | 23 ++++++ arch/x86/include/asm/thread_info.h | 11 --- arch/x86/kernel/cpu/common.c | 12 ++- arch/x86/kernel/head_64.S | 2 +- arch/x86/kernel/process.c | 3 +- arch/x86/kernel/process_32.c | 3 +- arch/x86/kernel/process_64.c | 5 +- arch/x86/kernel/smpboot.c | 3 +- arch/x86/kernel/traps.c | 3 +- arch/x86/kernel/vm86_32.c | 14 ++-- arch/x86/lguest/boot.c | 7 +- arch/x86/xen/enlighten_pv.c | 7 +- arch/x86/xen/smp_pv.c | 17 ++++- 20 files changed, 192 insertions(+), 139 deletions(-) -- 2.13.5