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=-19.2 required=3.0 tests=BAYES_00,DKIMWL_WL_HIGH, DKIM_SIGNED,DKIM_VALID,DKIM_VALID_AU,INCLUDES_CR_TRAILER,INCLUDES_PATCH, MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS,URIBL_BLOCKED,USER_AGENT_GIT autolearn=unavailable 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 4CD2CC4743E for ; Sun, 6 Jun 2021 09:05:10 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 1EEC06142A for ; Sun, 6 Jun 2021 09:05:10 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S230201AbhFFJGz (ORCPT ); Sun, 6 Jun 2021 05:06:55 -0400 Received: from mail.kernel.org ([198.145.29.99]:37366 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S229465AbhFFJGw (ORCPT ); Sun, 6 Jun 2021 05:06:52 -0400 Received: by mail.kernel.org (Postfix) with ESMTPSA id ADAC061429; Sun, 6 Jun 2021 09:05:00 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1622970303; bh=OILVP/xTrY25solt1VG9doQOz27QZP5b+AfmystSFro=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=Wwd1JFTUhf/IlgOz7j2TUa5JCLi2yaOe/hCx2R788MyBvmkFVbfkQJIjFZC1pA0Qb Rl5GK2mPJGAdfyAm1Awa1m2d4tjOphz3ceoA32ULnQTCzEIsAsw+TPpbGzZGN7HCLL 8gosXVoV8lECcwhCT2WPflUCKOtZjyIoDPHPmAV4oR/im31bj2TRLNgM3azv9Jq8rT fHpOO654x8qu1VdHEZg0YMfNIch6lNCTRVcUN2h8LLq3bqTxM38SDou1FHmL9qL2CD eb0L02cWE18iNh/VsEig5twdfNkYb+WJsG4QEDQHi8/dQrMKWW6SKdFbfZG5lxqaPK zvbwLJjZoNrHw== From: guoren@kernel.org To: guoren@kernel.org, anup.patel@wdc.com, palmerdabbelt@google.com, arnd@arndb.de, wens@csie.org, maxime@cerno.tech, drew@beagleboard.org, liush@allwinnertech.com, lazyparser@gmail.com, wefu@redhat.com Cc: linux-riscv@lists.infradead.org, linux-kernel@vger.kernel.org, linux-arch@vger.kernel.org, linux-sunxi@lists.linux.dev, Guo Ren Subject: [RFC PATCH v2 01/11] riscv: asid: Use global mappings for kernel pages Date: Sun, 6 Jun 2021 09:03:56 +0000 Message-Id: <1622970249-50770-2-git-send-email-guoren@kernel.org> X-Mailer: git-send-email 2.7.4 In-Reply-To: <1622970249-50770-1-git-send-email-guoren@kernel.org> References: <1622970249-50770-1-git-send-email-guoren@kernel.org> Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org From: Guo Ren We map kernel pages into all addresses space, so they can be marked as global. This allows hardware to avoid flushing the kernel mappings when moving between address spaces. Signed-off-by: Guo Ren Signed-off-by: Liu Shaohua Reviewed-by: Anup Patel Reviewed-by: Christoph Hellwig Signed-off-by: Liu Shaohua Cc: Chen-Yu Tsai Cc: Drew Fustini Cc: Maxime Ripard Cc: Palmer Dabbelt Cc: Wei Fu Cc: Wei Wu --- arch/riscv/include/asm/pgtable.h | 3 ++- 1 file changed, 2 insertions(+), 1 deletion(-) diff --git a/arch/riscv/include/asm/pgtable.h b/arch/riscv/include/asm/pgtable.h index 9469f46..346a3c6 100644 --- a/arch/riscv/include/asm/pgtable.h +++ b/arch/riscv/include/asm/pgtable.h @@ -134,7 +134,8 @@ | _PAGE_WRITE \ | _PAGE_PRESENT \ | _PAGE_ACCESSED \ - | _PAGE_DIRTY) + | _PAGE_DIRTY \ + | _PAGE_GLOBAL) #define PAGE_KERNEL __pgprot(_PAGE_KERNEL) #define PAGE_KERNEL_READ __pgprot(_PAGE_KERNEL & ~_PAGE_WRITE) -- 2.7.4