From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1752049AbcBVS6q (ORCPT ); Mon, 22 Feb 2016 13:58:46 -0500 Received: from mga03.intel.com ([134.134.136.65]:59506 "EHLO mga03.intel.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751303AbcBVS6o (ORCPT ); Mon, 22 Feb 2016 13:58:44 -0500 X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="5.22,485,1449561600"; d="scan'208";a="918655537" From: Yu-cheng Yu To: x86@kernel.org, "H. Peter Anvin" , Thomas Gleixner , Ingo Molnar , linux-kernel@vger.kernel.org Cc: Dave Hansen , Andy Lutomirski , Borislav Petkov , Sai Praneeth Prakhya , "Ravi V. Shankar" , Fenghua Yu , Yu-cheng Yu Subject: [PATCH 00/10] x86/xsaves: Fix XSAVES known issues Date: Mon, 22 Feb 2016 10:55:36 -0800 Message-Id: <1456167336-3637-1-git-send-email-yu-cheng.yu@intel.com> X-Mailer: git-send-email 1.9.1 Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org XSAVES is a kernel-mode instruction. It offers a compacted format and memory-write optimization. These patches fix known issues in the first implementation. They are intended for discussion and getting feedback before actually getting applied. Patch 1, 2, and 4 are for converting between kernel-mode xstate area and signal frames. Patch 8 is for converting between kernel-mode xstate area and ptrace frames. Patch 3 and 7 fix optimization issues introduced by XSAVES to the buffer init_fpstate. Patch 5 and 6 are related to xstate component offsets. Patch 9 fixes xstate area print out. Patch 10 re-enables XSAVES. Yu-cheng Yu (10): x86/xsaves: Define and use user_xstate_size for xstate size in signal context x86/xsaves: Rename xstate_size to kernel_xstate_size to explicitly distinguish xstate size in kernel from user space x86/xsaves: Keep init_fpstate.xsave.header.xfeatures as zero for init optimization x86/xsaves: Introduce a new check that allows correct xstates copy from kernel to user directly x86/xsaves: Align xstate components according to CPUID x86/xsaves: Supervisor state component offset x86/xsaves: Fix init_fpstate.header.xcomp_bv x86/xsaves: Fix PTRACE frames for XSAVES x86/xsaves: Fix XSTATE component offset print out x86/xsaves: Re-enable XSAVES arch/x86/include/asm/fpu/types.h | 2 + arch/x86/include/asm/fpu/xstate.h | 8 +- arch/x86/include/asm/processor.h | 3 +- arch/x86/kernel/fpu/core.c | 6 +- arch/x86/kernel/fpu/init.c | 32 +--- arch/x86/kernel/fpu/regset.c | 56 ++++-- arch/x86/kernel/fpu/signal.c | 69 ++++++- arch/x86/kernel/fpu/xstate.c | 388 +++++++++++++++++++++++++++++--------- 8 files changed, 425 insertions(+), 139 deletions(-) -- 1.9.1