From patchwork Sun Feb 27 16:28:21 2022 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-Patchwork-Submitter: Guo Ren X-Patchwork-Id: 12761997 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 bombadil.infradead.org (bombadil.infradead.org [198.137.202.133]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.lore.kernel.org (Postfix) with ESMTPS id 794F6C433F5 for ; Sun, 27 Feb 2022 16:35:23 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=lists.infradead.org; s=bombadil.20210309; h=Sender: Content-Transfer-Encoding:Content-Type:List-Subscribe:List-Help:List-Post: List-Archive:List-Unsubscribe:List-Id:MIME-Version:References:In-Reply-To: Message-Id:Date:Subject:Cc:To:From:Reply-To:Content-ID:Content-Description: Resent-Date:Resent-From:Resent-Sender:Resent-To:Resent-Cc:Resent-Message-ID: List-Owner; bh=Kjh7Btga/Tv81NDc8s47lPmNituUyvdXHEYvKescP60=; b=S2J1UZGHtOeUod R4labnhY1533V0qmFWus9k1baqf2emYgOpeMd4j+AEKKDuGC/j0L1+mRcnUpZh2HhM8EqZFd8/CiF 7fh+9XPQHBLzfbtpliMSGxo6QdqkWrC/Mhi1wRzSLbnW2nN4ThGmuPe3PItZF+XdPsxH7VzdRL64D t9MhW+x52hhpcoVwz+j4jK/Lz4n/9YwatMzHvl3bvDD4S+51v2Xo0jq0uzhp2n7dQk8eMS7jO6JCq GIpPvws9p86iajy9ddJlFCTHwhWXwHPm1MwcMvtEhANvJkF+PYKHYLdtXCk9mtFPncziBXiO32jWq HyILXPPjAZnvO6bEJHFg==; Received: from localhost ([::1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.94.2 #2 (Red Hat Linux)) id 1nOMUn-009iGP-2o; Sun, 27 Feb 2022 16:34:05 +0000 Received: from dfw.source.kernel.org ([2604:1380:4641:c500::1]) by bombadil.infradead.org with esmtps (Exim 4.94.2 #2 (Red Hat Linux)) id 1nOMQk-009fyo-9h; Sun, 27 Feb 2022 16:29:56 +0000 Received: from smtp.kernel.org (relay.kernel.org [52.25.139.140]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by dfw.source.kernel.org (Postfix) with ESMTPS id CCAC460F7A; Sun, 27 Feb 2022 16:29:53 +0000 (UTC) Received: by smtp.kernel.org (Postfix) with ESMTPSA id 5FF76C340F4; Sun, 27 Feb 2022 16:29:48 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1645979393; bh=a1sC80QEMsJ1SgwAfWEJYAxYwB7cBGeGznoe8NpsNfM=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=krAfy4GeSsPrHE0uGcwhUOCwTtgl45EIv3Cblk5hDNBiIgpEr917oCZ02DZux+kBO 9DvG5UKX/NZYQaBI9+wHWZrjKnPj6L9Oz3qFTloavUC5Lebxljn+i6gHa2BeNfPsf1 VKgacZktyICzpyZRjqr1sufK1CdUhfpxDQPpTR9c6lpN1CPjvUi7h/gJ+35Hc3H6HA yWkxXQqo9CvJ8tIhEvVrsk2w92qLni+wJfdxEPye8qbguIHDSsyxxpR7mTc285iRtn 5LHVn6KW5D7SkRoA53UcqcKzeDB0OluqYaBEd88NyakS5S0+cpWlmAlm/6L6KFQz8D AuQaV1jkb3bQw== From: guoren@kernel.org To: guoren@kernel.org, palmer@dabbelt.com, arnd@arndb.de, anup@brainfault.org, gregkh@linuxfoundation.org, liush@allwinnertech.com, wefu@redhat.com, drew@beagleboard.org, wangjunqiang@iscas.ac.cn, hch@lst.de Cc: linux-arch@vger.kernel.org, linux-kernel@vger.kernel.org, linux-riscv@lists.infradead.org, linux-csky@vger.kernel.org, linux-s390@vger.kernel.org, sparclinux@vger.kernel.org, linuxppc-dev@lists.ozlabs.org, linux-parisc@vger.kernel.org, linux-mips@vger.kernel.org, linux-arm-kernel@lists.infradead.org, x86@kernel.org, Guo Ren Subject: [PATCH V7 10/20] riscv: compat: Re-implement TASK_SIZE for COMPAT_32BIT Date: Mon, 28 Feb 2022 00:28:21 +0800 Message-Id: <20220227162831.674483-11-guoren@kernel.org> X-Mailer: git-send-email 2.25.1 In-Reply-To: <20220227162831.674483-1-guoren@kernel.org> References: <20220227162831.674483-1-guoren@kernel.org> MIME-Version: 1.0 X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20220227_082954_512182_02CE73A6 X-CRM114-Status: GOOD ( 10.41 ) X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.34 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+linux-arm-kernel=archiver.kernel.org@lists.infradead.org From: Guo Ren Make TASK_SIZE from const to dynamic detect TIF_32BIT flag function. Refer to arm64 to implement DEFAULT_MAP_WINDOW_64 for efi-stub. Limit 32-bit compatible process in 0-2GB virtual address range (which is enough for real scenarios), because it could avoid address sign extend problem when 32-bit enter 64-bit and ease software design. The standard 32-bit TASK_SIZE is 0x9dc00000:FIXADDR_START, and compared to a compatible 32-bit, it increases 476MB for the application's virtual address. Signed-off-by: Guo Ren Signed-off-by: Guo Ren Reviewed-by: Arnd Bergmann --- arch/riscv/include/asm/pgtable.h | 13 +++++++++++-- 1 file changed, 11 insertions(+), 2 deletions(-) diff --git a/arch/riscv/include/asm/pgtable.h b/arch/riscv/include/asm/pgtable.h index 7e949f25c933..f0d125ea3ceb 100644 --- a/arch/riscv/include/asm/pgtable.h +++ b/arch/riscv/include/asm/pgtable.h @@ -704,8 +704,17 @@ static inline pmd_t pmdp_establish(struct vm_area_struct *vma, * 63–48 all equal to bit 47, or else a page-fault exception will occur." */ #ifdef CONFIG_64BIT -#define TASK_SIZE (PGDIR_SIZE * PTRS_PER_PGD / 2) -#define TASK_SIZE_MIN (PGDIR_SIZE_L3 * PTRS_PER_PGD / 2) +#define TASK_SIZE_64 (PGDIR_SIZE * PTRS_PER_PGD / 2) +#define TASK_SIZE_MIN (PGDIR_SIZE_L3 * PTRS_PER_PGD / 2) + +#ifdef CONFIG_COMPAT +#define TASK_SIZE_32 (_AC(0x80000000, UL) - PAGE_SIZE) +#define TASK_SIZE (test_thread_flag(TIF_32BIT) ? \ + TASK_SIZE_32 : TASK_SIZE_64) +#else +#define TASK_SIZE TASK_SIZE_64 +#endif + #else #define TASK_SIZE FIXADDR_START #define TASK_SIZE_MIN TASK_SIZE