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 Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id 6EFC8C433FE for ; Fri, 26 Nov 2021 10:25:16 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1376537AbhKZK21 (ORCPT ); Fri, 26 Nov 2021 05:28:27 -0500 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:38818 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S239294AbhKZK0S (ORCPT ); Fri, 26 Nov 2021 05:26:18 -0500 Received: from mail-pl1-x635.google.com (mail-pl1-x635.google.com [IPv6:2607:f8b0:4864:20::635]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 92EB2C0613F3 for ; Fri, 26 Nov 2021 02:14:15 -0800 (PST) Received: by mail-pl1-x635.google.com with SMTP id b13so6401406plg.2 for ; Fri, 26 Nov 2021 02:14:15 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20210112; h=from:to:cc:subject:date:message-id:in-reply-to:references :mime-version:content-transfer-encoding; bh=/sECo0GpgifEJ2MV3wheABZwv7jRSxT6iKt29SsZfcE=; b=Z0+Spa7B+BCqXcLfz0YGZbrC4jKq+xdxprwO07cbH7WKhUBh2ZtmgFkfVrXSG6ezCv ohZN+0gnQaMJWv/6k55oCm8cCDLI+s4rQ3C7b5dSx5PQeqa2E98+/rLNnXtvKP9Qh/Eh TcsSmlGb05SFhoDnI4iFDBn3E2gUSSW98mSScSziNdPHkBsxyl8htm1At0hcQ/IIV2Br 23P6c61d4zGGO3Kd+E2lVNT2ayepvRMdQaecT5/VgK3JZ8a/KjC603wMb5joM6PMQonS Sbxt0eqOhZP8bhlePW9CIMyR621o909XXYnQIChNrwBo/tUALvfuM583Euq9eKrEWpFd 36Vg== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20210112; h=x-gm-message-state:from:to:cc:subject:date:message-id:in-reply-to :references:mime-version:content-transfer-encoding; bh=/sECo0GpgifEJ2MV3wheABZwv7jRSxT6iKt29SsZfcE=; b=35fHvKOagwBm9taKGL8sm2H8WthB3gtcxWyfVbOpPKjQpn+YjkkgppemTP8x6AZ82a 3SQwc/QSa4YaIDYnJQONYpXcXC5WL68kJ5EYr9kQAWSFnzm1opM/ADjxVPPbqbJfGxJr DEJmoAQKywx5Cd5jGue+HelXP8sJIfUK2grtqchyK89UZyblSvHnsmzOMawWlDPpGxTH TyjEtwV7eUhwQcF/ZruLkcXUnlwf8sUHxeACOWtfY3H0ReRjwte52wi1gj5LSMZGwch+ MftYP/gcfPeGGGn2lTmNOys2YYqPYYo4qboh73sjqYIDp8JFdh9RRhdo/ZskDfCGTjgO 9Y3Q== X-Gm-Message-State: AOAM531ZVaDjzPHmZ43gAJoQ8gKY67dx1vlFtgzRhMmc7MsDfE9TwgKk 6/jDDCLd3137sTIhzv8K8F4EenKd53Q= X-Google-Smtp-Source: ABdhPJxhCfFzGpJeUBI0jehJ+XzbHvcgJ03uSVcU70la5hCPgW42/9kIeQqi0cuBVJXdzEx0runZmA== X-Received: by 2002:a17:902:7d96:b0:142:87dc:7dd3 with SMTP id a22-20020a1709027d9600b0014287dc7dd3mr35974897plm.11.1637921655027; Fri, 26 Nov 2021 02:14:15 -0800 (PST) Received: from localhost ([47.251.3.230]) by smtp.gmail.com with ESMTPSA id mq14sm11741862pjb.54.2021.11.26.02.14.14 (version=TLS1_2 cipher=ECDHE-ECDSA-AES128-GCM-SHA256 bits=128/128); Fri, 26 Nov 2021 02:14:14 -0800 (PST) From: Lai Jiangshan To: linux-kernel@vger.kernel.org Cc: x86@kernel.org, Lai Jiangshan , Andy Lutomirski , Thomas Gleixner , Ingo Molnar , Borislav Petkov , Dave Hansen , "H. Peter Anvin" Subject: [PATCH V6 22/49] x86/entry: Convert SWAPGS to swapgs in error_entry() Date: Fri, 26 Nov 2021 18:11:42 +0800 Message-Id: <20211126101209.8613-23-jiangshanlai@gmail.com> X-Mailer: git-send-email 2.19.1.6.gb485710b In-Reply-To: <20211126101209.8613-1-jiangshanlai@gmail.com> References: <20211126101209.8613-1-jiangshanlai@gmail.com> MIME-Version: 1.0 Content-Transfer-Encoding: 8bit Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org From: Lai Jiangshan XENPV doesn't use error_entry() anymore, so the pv-aware SWAPGS can be changed to native swapgs. It is prepared for later patch to convert error_entry() to C code, which uses native_swapgs() directly. Converting SWAPGS to swapgs in ASM error_entry first to ensure the later patch has zero semantic change. Signed-off-by: Lai Jiangshan --- arch/x86/entry/entry_64.S | 6 +++--- 1 file changed, 3 insertions(+), 3 deletions(-) diff --git a/arch/x86/entry/entry_64.S b/arch/x86/entry/entry_64.S index c09e5a4dfbbf..4d88cd0c46c6 100644 --- a/arch/x86/entry/entry_64.S +++ b/arch/x86/entry/entry_64.S @@ -994,7 +994,7 @@ SYM_CODE_START_LOCAL(error_entry) * We entered from user mode or we're pretending to have entered * from user mode due to an IRET fault. */ - SWAPGS + swapgs FENCE_SWAPGS_USER_ENTRY /* We have user CR3. Change to kernel CR3. */ SWITCH_TO_KERNEL_CR3 scratch_reg=%rax @@ -1026,7 +1026,7 @@ SYM_CODE_START_LOCAL(error_entry) * gsbase and proceed. We'll fix up the exception and land in * .Lgs_change's error handler with kernel gsbase. */ - SWAPGS + swapgs /* * The above code has no serializing instruction. So do an lfence @@ -1048,7 +1048,7 @@ SYM_CODE_START_LOCAL(error_entry) * We came from an IRET to user mode, so we have user * gsbase and CR3. Switch to kernel gsbase and CR3: */ - SWAPGS + swapgs FENCE_SWAPGS_USER_ENTRY SWITCH_TO_KERNEL_CR3 scratch_reg=%rax -- 2.19.1.6.gb485710b