From patchwork Mon Jul 12 06:11:15 2021 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Greg Kroah-Hartman X-Patchwork-Id: 475649 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=-19.5 required=3.0 tests=BAYES_00,DKIMWL_WL_HIGH, DKIM_SIGNED,DKIM_VALID,DKIM_VALID_AU,HEADER_FROM_DIFFERENT_DOMAINS, INCLUDES_CR_TRAILER, INCLUDES_PATCH, MAILING_LIST_MULTI, SPF_HELO_NONE, SPF_PASS, USER_AGENT_GIT autolearn=ham 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 EC070C07E99 for ; Mon, 12 Jul 2021 07:23:39 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id D75726191F for ; Mon, 12 Jul 2021 07:23:39 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S243741AbhGLH0Z (ORCPT ); Mon, 12 Jul 2021 03:26:25 -0400 Received: from mail.kernel.org ([198.145.29.99]:34284 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1343835AbhGLHYW (ORCPT ); Mon, 12 Jul 2021 03:24:22 -0400 Received: by mail.kernel.org (Postfix) with ESMTPSA id A544F6140F; Mon, 12 Jul 2021 07:21:10 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=linuxfoundation.org; s=korg; t=1626074471; bh=bcB3nMSciNpF5lim5unmyHce8opSUYrNDvmjECH1mV0=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=g+QWAvQyPymiD69ACkuS/Qx0HG7JCiw63zis6fbTVze8AMRQOHAU1HCp40TzjVLoo IPYmUB7M+9s78T9WgjEvn0FOD5CYgEVI8Fw9bOy4WGECooRPlPh6KFmMWFrgGJvj9r iZPQQhj9QuY7lBBkOrBvoGBRE6AvCr1E1f3Lm8SU= From: Greg Kroah-Hartman To: linux-kernel@vger.kernel.org Cc: Greg Kroah-Hartman , stable@vger.kernel.org, Gerald Schaefer , Niklas Schnelle , Vasily Gorbik , Sasha Levin Subject: [PATCH 5.12 592/700] s390: enable HAVE_IOREMAP_PROT Date: Mon, 12 Jul 2021 08:11:15 +0200 Message-Id: <20210712061038.955542316@linuxfoundation.org> X-Mailer: git-send-email 2.32.0 In-Reply-To: <20210712060924.797321836@linuxfoundation.org> References: <20210712060924.797321836@linuxfoundation.org> User-Agent: quilt/0.66 MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: stable@vger.kernel.org From: Niklas Schnelle [ Upstream commit d460bb6c6417588dd8b0907d34f69b237918812a ] In commit b02002cc4c0f ("s390/pci: Implement ioremap_wc/prot() with MIO") we implemented both ioremap_wc() and ioremap_prot() however until now we had not set HAVE_IOREMAP_PROT in Kconfig, do so now. This also requires implementing pte_pgprot() as this is used in the generic_access_phys() code enabled by CONFIG_HAVE_IOREMAP_PROT. As with ioremap_wc() we need to take the MMIO Write Back bit index into account. Moreover since the pgprot value returned from pte_pgprot() is to be used for mappings into kernel address space we must make sure that it uses appropriate kernel page table protection bits. In particular a pgprot value originally coming from userspace could have the _PAGE_PROTECT bit set to enable fault based dirty bit accounting which would then make the mapping inaccessible when used in kernel address space. Fixes: b02002cc4c0f ("s390/pci: Implement ioremap_wc/prot() with MIO") Reviewed-by: Gerald Schaefer Signed-off-by: Niklas Schnelle Signed-off-by: Vasily Gorbik Signed-off-by: Sasha Levin --- arch/s390/Kconfig | 1 + arch/s390/include/asm/pgtable.h | 19 +++++++++++++++++++ 2 files changed, 20 insertions(+) diff --git a/arch/s390/Kconfig b/arch/s390/Kconfig index c1ff874e6c2e..d6676197276c 100644 --- a/arch/s390/Kconfig +++ b/arch/s390/Kconfig @@ -160,6 +160,7 @@ config S390 select HAVE_FUTEX_CMPXCHG if FUTEX select HAVE_GCC_PLUGINS select HAVE_GENERIC_VDSO + select HAVE_IOREMAP_PROT if PCI select HAVE_IRQ_EXIT_ON_IRQ_STACK select HAVE_KERNEL_BZIP2 select HAVE_KERNEL_GZIP diff --git a/arch/s390/include/asm/pgtable.h b/arch/s390/include/asm/pgtable.h index b38f7b781564..adea53f69bfd 100644 --- a/arch/s390/include/asm/pgtable.h +++ b/arch/s390/include/asm/pgtable.h @@ -863,6 +863,25 @@ static inline int pte_unused(pte_t pte) return pte_val(pte) & _PAGE_UNUSED; } +/* + * Extract the pgprot value from the given pte while at the same time making it + * usable for kernel address space mappings where fault driven dirty and + * young/old accounting is not supported, i.e _PAGE_PROTECT and _PAGE_INVALID + * must not be set. + */ +static inline pgprot_t pte_pgprot(pte_t pte) +{ + unsigned long pte_flags = pte_val(pte) & _PAGE_CHG_MASK; + + if (pte_write(pte)) + pte_flags |= pgprot_val(PAGE_KERNEL); + else + pte_flags |= pgprot_val(PAGE_KERNEL_RO); + pte_flags |= pte_val(pte) & mio_wb_bit_mask; + + return __pgprot(pte_flags); +} + /* * pgd/pmd/pte modification functions */