From patchwork Thu Feb 24 08:54:00 2022 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-Patchwork-Submitter: Guo Ren X-Patchwork-Id: 12758137 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 A6492C433EF for ; Thu, 24 Feb 2022 09:03:00 +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=EV7ZrdAqCv8flH cZA1FMXR0ZH13jC1UzSDL50WlUYwrW4dKc4xRMVbLM17eFGDkzLZh4lH/cXl6zoZ0muwlIVhpREBt x63RKikM2J9qpIUVYCrxuVKjRp7cHeOaWt6fVeNSAkNL55k+AZbcBzI5pHslL6N4odlf7bD1IRKvl vD14RHUdPDoCVxJznDO+AtrLWDQhgrhrFZVfdjy6/a7oU6ZhUYMV419KV478yB/Ug6uP3HVJ3HIWG IzKCuXLOvh/uMsJ76CNsNTYzPo7PcJ3RVAB6mVU1rU9eLKacqZqf0lilH+yKHOBknhze3jZn+nDAX rhcIq8lJJgZ9Txio8ttQ==; Received: from localhost ([::1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.94.2 #2 (Red Hat Linux)) id 1nN9zz-00HRwR-Bg; Thu, 24 Feb 2022 09:01:20 +0000 Received: from ams.source.kernel.org ([145.40.68.75]) by bombadil.infradead.org with esmtps (Exim 4.94.2 #2 (Red Hat Linux)) id 1nN9uz-00HOjX-M6; Thu, 24 Feb 2022 08:56:11 +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 ams.source.kernel.org (Postfix) with ESMTPS id E0A9AB82497; Thu, 24 Feb 2022 08:56:07 +0000 (UTC) Received: by smtp.kernel.org (Postfix) with ESMTPSA id 91A18C340EB; Thu, 24 Feb 2022 08:56:00 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1645692966; bh=a1sC80QEMsJ1SgwAfWEJYAxYwB7cBGeGznoe8NpsNfM=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=NpS8IbTxPPAt4S03C9fF9JBTCncwR1OU1YbsGIVcwFRfu3CFb0E++WuIYfsqKk+hj H7YRu4FxifAv0w1LbWv32kJbqzHdbp5hyDhhd2xtXVEL3+uY74mxNRhJkjPQgkgFWI RFTSncouIW5jBpQtW4xEVC4P2CS2LBRscnCcqRAD8D2yVSeZWHy9DK8/IDeWLg1xZD zu/do4A3OFE/w29A8S6YgQVMnu1Tru7MBXFIU3cgibKE5VarQBAqWzrMmwl4Cpxw7U OZe6xg8KOQp84zv2c3m+8S2qjhkrjs87gobwhadSj0Hn51/dOTU8GEkLyRARCa+HBu 7lmP+lN4XfJFw== 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 V6 10/20] riscv: compat: Re-implement TASK_SIZE for COMPAT_32BIT Date: Thu, 24 Feb 2022 16:54:00 +0800 Message-Id: <20220224085410.399351-11-guoren@kernel.org> X-Mailer: git-send-email 2.25.1 In-Reply-To: <20220224085410.399351-1-guoren@kernel.org> References: <20220224085410.399351-1-guoren@kernel.org> MIME-Version: 1.0 X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20220224_005609_971027_CD494945 X-CRM114-Status: GOOD ( 10.62 ) 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