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 88DD1C433EF for ; Sun, 12 Jun 2022 09:00:49 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S235311AbiFLJAs (ORCPT ); Sun, 12 Jun 2022 05:00:48 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:38994 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S235218AbiFLJAh (ORCPT ); Sun, 12 Jun 2022 05:00:37 -0400 Received: from mail-wr1-x429.google.com (mail-wr1-x429.google.com [IPv6:2a00:1450:4864:20::429]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id C012549F3E for ; Sun, 12 Jun 2022 02:00:35 -0700 (PDT) Received: by mail-wr1-x429.google.com with SMTP id a15so3704917wrh.2 for ; Sun, 12 Jun 2022 02:00:35 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=fastly.com; s=google; h=from:to:cc:subject:date:message-id:in-reply-to:references; bh=MH4Lv8K62JKUOJxVHdgE/oEdWi4lVPPJtSl5KwJG+1g=; b=p23NZpYkNV6Mw0OmtGi312n7HxeU9JJ/KfuYg25OWavQonbuxP2PlxFs7ZNZZmpppx e8oH+SylS9UYulExeaAjCPDHKx7nTbs1/SxiYfEWenUQ605TBPwdT41rY6WtmUWw4NTE mJsDBZYyuxn9oqyK0A9GWbS6xXQ3e+sQCMySI= 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; bh=MH4Lv8K62JKUOJxVHdgE/oEdWi4lVPPJtSl5KwJG+1g=; b=O3D8XrJpvhkQbLEAy/DgLH0GOSr9s4jAY63yYIbChqrQzKdnAAK3r5MOEnfJYv3HaH M2oMKHoqzeswjDw5pMoRzgcJ/7eRqdGMoEIe0JwOkNHOlrCGkltIZlfp6pfHdlUkNMX7 e/jwZUvX0ycU/Dtr0gy8F90D7+uwipW2Qpq3EcEvoMKJHhtN+0W2JnQKduj6azwLGgG6 viAtoRyP2aqLshQ/MS33axvY+gZ+1y/sC+TW9n/Om0tqH7utQd5HIyomKZhapww33xSr /I4+Z2wEwhruhJtUvBJX9W2Dyu/zpKAt3KJZPc7EyFE+hK3C9fgWL4B02flGBng+/XKZ sQmQ== X-Gm-Message-State: AOAM5324h4Xpqz3z1caIW6EwqKid8qc0cBo93WNDkK9FD8/1bUojc9O7 rwdHxcWO1ZQdivsMkjmADXJABw== X-Google-Smtp-Source: ABdhPJzPfVvDi7oTmyqgIAHJ2AcFuN31YYqfCHQZc8+YvM1Z23odoVoyM/EwdMd9H9m+5olvSCaDUQ== X-Received: by 2002:a5d:4c49:0:b0:210:353c:1c91 with SMTP id n9-20020a5d4c49000000b00210353c1c91mr52527060wrt.159.1655024434317; Sun, 12 Jun 2022 02:00:34 -0700 (PDT) Received: from localhost.localdomain ([178.130.153.185]) by smtp.gmail.com with ESMTPSA id d34-20020a05600c4c2200b0039c5b4ab1b0sm4798603wmp.48.2022.06.12.02.00.31 (version=TLS1_2 cipher=ECDHE-ECDSA-AES128-GCM-SHA256 bits=128/128); Sun, 12 Jun 2022 02:00:32 -0700 (PDT) From: Joe Damato To: Thomas Gleixner , Ingo Molnar , Borislav Petkov , Dave Hansen , x86@kernel.org, "H. Peter Anvin" , linux-kernel@vger.kernel.org Cc: Joe Damato Subject: [RFC,x86 v2 1/8] arch, x86, uaccess: Add nontemporal copy functions Date: Sun, 12 Jun 2022 01:57:50 -0700 Message-Id: <1655024280-23827-2-git-send-email-jdamato@fastly.com> X-Mailer: git-send-email 2.7.4 In-Reply-To: <1655024280-23827-1-git-send-email-jdamato@fastly.com> References: <1655024280-23827-1-git-send-email-jdamato@fastly.com> Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Add a generic non-temporal wrapper to uaccess which can be overridden by arches that support non-temporal copies. An implementation is added for x86 which wraps an existing non-temporal copy in the kernel. Signed-off-by: Joe Damato --- arch/x86/include/asm/uaccess_64.h | 6 ++++++ include/linux/uaccess.h | 6 ++++++ 2 files changed, 12 insertions(+) diff --git a/arch/x86/include/asm/uaccess_64.h b/arch/x86/include/asm/uaccess_64.h index 45697e0..ed41dba 100644 --- a/arch/x86/include/asm/uaccess_64.h +++ b/arch/x86/include/asm/uaccess_64.h @@ -65,6 +65,12 @@ extern long __copy_user_flushcache(void *dst, const void __user *src, unsigned s extern void memcpy_page_flushcache(char *to, struct page *page, size_t offset, size_t len); +static inline unsigned long +__copy_from_user_nocache(void *dst, const void __user *src, unsigned long size) +{ + return (unsigned long)__copy_user_nocache(dst, src, (unsigned int) size, 0); +} + static inline int __copy_from_user_inatomic_nocache(void *dst, const void __user *src, unsigned size) diff --git a/include/linux/uaccess.h b/include/linux/uaccess.h index 5a328cf..6612c37 100644 --- a/include/linux/uaccess.h +++ b/include/linux/uaccess.h @@ -256,6 +256,12 @@ static inline size_t probe_subpage_writeable(char __user *uaddr, size_t size) #ifndef ARCH_HAS_NOCACHE_UACCESS static inline __must_check unsigned long +__copy_from_user_nocache(void *to, const void __user *from, unsigned long n) +{ + return __copy_from_user(to, from, n); +} + +static inline __must_check unsigned long __copy_from_user_inatomic_nocache(void *to, const void __user *from, unsigned long n) { -- 2.7.4