From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-9.7 required=3.0 tests=HEADER_FROM_DIFFERENT_DOMAINS, INCLUDES_PATCH,MAILING_LIST_MULTI,SIGNED_OFF_BY,SPF_HELO_NONE,SPF_PASS, UNPARSEABLE_RELAY,USER_AGENT_GIT autolearn=ham autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 03637C38A30 for ; Sun, 19 Apr 2020 14:41:02 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id DC7F6212CC for ; Sun, 19 Apr 2020 14:41:01 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1726378AbgDSOlA (ORCPT ); Sun, 19 Apr 2020 10:41:00 -0400 Received: from out30-131.freemail.mail.aliyun.com ([115.124.30.131]:44740 "EHLO out30-131.freemail.mail.aliyun.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1725793AbgDSOk7 (ORCPT ); Sun, 19 Apr 2020 10:40:59 -0400 X-Alimail-AntiSpam: AC=PASS;BC=-1|-1;BR=01201311R101e4;CH=green;DM=||false|;DS=||;FP=0|-1|-1|-1|0|-1|-1|-1;HT=e01e07484;MF=laijs@linux.alibaba.com;NM=1;PH=DS;RN=8;SR=0;TI=SMTPD_---0Tw-MiXF_1587307256; Received: from localhost(mailfrom:laijs@linux.alibaba.com fp:SMTPD_---0Tw-MiXF_1587307256) by smtp.aliyun-inc.com(127.0.0.1); Sun, 19 Apr 2020 22:40:56 +0800 From: Lai Jiangshan To: linux-kernel@vger.kernel.org Cc: Lai Jiangshan , Andy Lutomirski , Thomas Gleixner , Ingo Molnar , Borislav Petkov , x86@kernel.org, "H. Peter Anvin" Subject: [PATCH 1/3] x86/entry: remove unneeded kernel cr3 switching Date: Sun, 19 Apr 2020 14:40:47 +0000 Message-Id: <20200419144049.1906-2-laijs@linux.alibaba.com> X-Mailer: git-send-email 2.20.1 In-Reply-To: <20200419144049.1906-1-laijs@linux.alibaba.com> References: <20200419144049.1906-1-laijs@linux.alibaba.com> MIME-Version: 1.0 Content-Transfer-Encoding: 8bit Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org When native_load_gs_index() fails on .Lgs_change, the cr3 must be kernel cr3. Don't need to switch it. Signed-off-by: Lai Jiangshan --- arch/x86/entry/entry_64.S | 1 - 1 file changed, 1 deletion(-) diff --git a/arch/x86/entry/entry_64.S b/arch/x86/entry/entry_64.S index 0e9504fabe52..b789835afbab 100644 --- a/arch/x86/entry/entry_64.S +++ b/arch/x86/entry/entry_64.S @@ -1339,7 +1339,6 @@ SYM_CODE_START_LOCAL(error_entry) */ SWAPGS FENCE_SWAPGS_USER_ENTRY - SWITCH_TO_KERNEL_CR3 scratch_reg=%rax jmp .Lerror_entry_done .Lbstep_iret: -- 2.20.1