From patchwork Thu Jan 20 07:39:00 2022 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Guo Ren X-Patchwork-Id: 12718383 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 28409C433EF for ; Thu, 20 Jan 2022 07:47:02 +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: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:In-Reply-To:References: List-Owner; bh=3BbP1RlQaawaOekaQ66xVIuWYim7UpEictl1dIwqLgs=; b=oSQbfF6kc6VQhg IVybuX8EPwfc2ix+O0cL9mWEMs+yPZV07SvjcRRm2MrRmf1xEUYqfR8ycF0mut1/jcr9910j85Qan /Sy+3fEqMF0+qBxjN3VdySKUmbupXSrBWKvKHRUt72UELgeTfswLuN2fUDWvJnvpo4KSW8NrHRJ/L /hx5nxzWgsp/G8UnFC8uXZmvinhmMOdHPjniIwYjZJZRXuR4SmQOYoTPrq8AaeYq6odsm1unLM/Sl XMIICQSenIGLvRDGEY9XnmRO1eUJ9fWmBTFRwV5h8H370iKAB3G3EGhL4EJfps9ojzYtGU6CaB5h9 Nb5SF61LFnLeYZ/Nk3kQ==; Received: from localhost ([::1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.94.2 #2 (Red Hat Linux)) id 1nAS8M-009QbO-SO; Thu, 20 Jan 2022 07:45:27 +0000 Received: from dfw.source.kernel.org ([139.178.84.217]) by bombadil.infradead.org with esmtps (Exim 4.94.2 #2 (Red Hat Linux)) id 1nAS3V-009O8s-MK; Thu, 20 Jan 2022 07:40:28 +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 2A81F616EB; Thu, 20 Jan 2022 07:40:25 +0000 (UTC) Received: by smtp.kernel.org (Postfix) with ESMTPSA id 91272C340E7; Thu, 20 Jan 2022 07:40:16 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1642664423; bh=+foGi24mAAkXv8HxHMW+tCVoz4WSBNmzOsAdyp+IN6s=; h=From:To:Cc:Subject:Date:From; b=lom4qx8Te+fvkiYhBhSctO4VuKi6tI0DbDmkHwpzmV//j2i2ErVO3t7aDskslPgRk LXTRb5IbUV0LggS3rARH7FiiY0sWWAT9q10+8hsW1WjRumx52fSr5qZJKdbQfdUUS7 kAQvkC0DVHon+jSt2vPO8VA514PVFxa+kNydggWhJNkc43VoOnglGKDpg5szAiFQur prLryGZqMuK0lxnZOklFZOwDE8CIEOpqR8J1HPksfNnG6dbefol4ArvNWMQMcXHeyO Yxw7TwdmL7JKjLzKI8rr/xbpzXgy8JvrhlnHCqbqMlk/yMvPXvVNEF2wZN8MMCH0DO cEGKyYdX/LGLg== 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, hch@infradead.org Cc: 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, inux-parisc@vger.kernel.org, linux-mips@vger.kernel.org, linux-arm-kernel@lists.infradead.org, x86@kernel.org, Guo Ren Subject: [PATCH V3 07/17] riscv: compat: Re-implement TASK_SIZE for COMPAT_32BIT Date: Thu, 20 Jan 2022 15:39:00 +0800 Message-Id: <20220120073911.99857-8-guoren@kernel.org> X-Mailer: git-send-email 2.25.1 MIME-Version: 1.0 X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20220119_234025_851427_CF167A66 X-CRM114-Status: GOOD ( 11.24 ) 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 Cc: Arnd Bergmann Reviewed-by: Arnd Bergmann --- arch/riscv/include/asm/pgtable.h | 11 ++++++++++- arch/riscv/include/asm/processor.h | 6 ++++++ drivers/firmware/efi/libstub/efi-stub.c | 2 +- 3 files changed, 17 insertions(+), 2 deletions(-) diff --git a/arch/riscv/include/asm/pgtable.h b/arch/riscv/include/asm/pgtable.h index 67f687aee673..e0add598e66a 100644 --- a/arch/riscv/include/asm/pgtable.h +++ b/arch/riscv/include/asm/pgtable.h @@ -669,7 +669,16 @@ static inline pmd_t pmdp_establish(struct vm_area_struct *vma, * Note that PGDIR_SIZE must evenly divide TASK_SIZE. */ #ifdef CONFIG_64BIT -#define TASK_SIZE (PGDIR_SIZE * PTRS_PER_PGD / 2) +#define TASK_SIZE_64 (PGDIR_SIZE * 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 #endif diff --git a/arch/riscv/include/asm/processor.h b/arch/riscv/include/asm/processor.h index 0749924d9e55..8649436b8fcf 100644 --- a/arch/riscv/include/asm/processor.h +++ b/arch/riscv/include/asm/processor.h @@ -61,6 +61,12 @@ static inline void arch_thread_struct_whitelist(unsigned long *offset, extern void start_thread(struct pt_regs *regs, unsigned long pc, unsigned long sp); +#ifdef CONFIG_COMPAT +#define DEFAULT_MAP_WINDOW_64 TASK_SIZE_64 +#else +#define DEFAULT_MAP_WINDOW_64 TASK_SIZE +#endif + /* Free all resources held by a thread. */ static inline void release_thread(struct task_struct *dead_task) { diff --git a/drivers/firmware/efi/libstub/efi-stub.c b/drivers/firmware/efi/libstub/efi-stub.c index e87e7f1b1a33..f57f85646a45 100644 --- a/drivers/firmware/efi/libstub/efi-stub.c +++ b/drivers/firmware/efi/libstub/efi-stub.c @@ -38,7 +38,7 @@ #define EFI_RT_VIRTUAL_BASE SZ_512M #define EFI_RT_VIRTUAL_SIZE SZ_512M -#ifdef CONFIG_ARM64 +#if defined(CONFIG_ARM64) || defined(CONFIG_RISCV) # define EFI_RT_VIRTUAL_LIMIT DEFAULT_MAP_WINDOW_64 #else # define EFI_RT_VIRTUAL_LIMIT TASK_SIZE