From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1752307AbcB2RqQ (ORCPT ); Mon, 29 Feb 2016 12:46:16 -0500 Received: from mga14.intel.com ([192.55.52.115]:59739 "EHLO mga14.intel.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1750718AbcB2RqH (ORCPT ); Mon, 29 Feb 2016 12:46:07 -0500 X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="5.22,521,1449561600"; d="scan'208";a="755365978" 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 v3 0/9] x86/xsaves: Fix XSAVES known issues Date: Mon, 29 Feb 2016 09:41:58 -0800 Message-Id: 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. Version 3 adds a WARN_ONCE() in patch 9 to make it clear XSAVES supervisor states are not yet supported. Version 2 fixes a mistake in handling supervisor states of ptrace function copyin_to_xsaves() and some coding style/naming issues in the first version. It also limits XSAVES only to 64-bit kernel in patch 9. Patch 1, 2, and 4 are for converting between kernel-mode xstate area and signal frames. Patch 3 fixes optimization issues introduced by XSAVES to the buffer init_fpstate. Patch 5 and 6 are related to xstate component offsets. Patch 7 is for converting between kernel-mode xstate area and ptrace frames. Patch 8 fixes xstate area print out. Patch 9 re-enables XSAVES. Yu-cheng Yu (9): 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 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 | 35 ++-- arch/x86/kernel/fpu/regset.c | 56 ++++-- arch/x86/kernel/fpu/signal.c | 69 ++++++- arch/x86/kernel/fpu/xstate.c | 400 +++++++++++++++++++++++++++++--------- 8 files changed, 443 insertions(+), 136 deletions(-) -- 1.9.1