From patchwork Sun Feb 28 11:19:16 2016 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Shannon Zhao X-Patchwork-Id: 63142 Delivered-To: patch@linaro.org Received: by 10.112.199.169 with SMTP id jl9csp731194lbc; Sun, 28 Feb 2016 03:25:20 -0800 (PST) X-Received: by 10.31.182.18 with SMTP id g18mr7885574vkf.73.1456658720533; Sun, 28 Feb 2016 03:25:20 -0800 (PST) Return-Path: Received: from lists.xen.org (lists.xenproject.org. [192.237.175.120]) by mx.google.com with ESMTPS id x135si13601039vkx.123.2016.02.28.03.25.19 (version=TLS1_2 cipher=ECDHE-RSA-AES128-GCM-SHA256 bits=128/128); Sun, 28 Feb 2016 03:25:20 -0800 (PST) Received-SPF: neutral (google.com: 192.237.175.120 is neither permitted nor denied by best guess record for domain of xen-devel-bounces@lists.xen.org) client-ip=192.237.175.120; Authentication-Results: mx.google.com; spf=neutral (google.com: 192.237.175.120 is neither permitted nor denied by best guess record for domain of xen-devel-bounces@lists.xen.org) smtp.mailfrom=xen-devel-bounces@lists.xen.org Received: from localhost ([127.0.0.1] helo=lists.xen.org) by lists.xen.org with esmtp (Exim 4.84) (envelope-from ) id 1aZzSL-0005SN-Fr; Sun, 28 Feb 2016 11:24:09 +0000 Received: from mail6.bemta3.messagelabs.com ([195.245.230.39]) by lists.xen.org with esmtp (Exim 4.84) (envelope-from ) id 1aZzSJ-0005RJ-RL for xen-devel@lists.xen.org; Sun, 28 Feb 2016 11:24:07 +0000 Received: from [85.158.137.68] by server-6.bemta-3.messagelabs.com id C3/85-23864-7D8D2D65; Sun, 28 Feb 2016 11:24:07 +0000 X-Env-Sender: zhaoshenglong@huawei.com X-Msg-Ref: server-12.tower-31.messagelabs.com!1456658639!25470764!1 X-Originating-IP: [58.251.152.64] X-SpamReason: No, hits=0.0 required=7.0 tests= X-StarScan-Received: X-StarScan-Version: 7.35.1; banners=-,-,- X-VirusChecked: Checked Received: (qmail 50259 invoked from network); 28 Feb 2016 11:24:05 -0000 Received: from szxga01-in.huawei.com (HELO szxga01-in.huawei.com) (58.251.152.64) by server-12.tower-31.messagelabs.com with RC4-SHA encrypted SMTP; 28 Feb 2016 11:24:05 -0000 Received: from 172.24.1.49 (EHLO szxeml432-hub.china.huawei.com) ([172.24.1.49]) by szxrg01-dlp.huawei.com (MOS 4.3.7-GA FastPath queued) with ESMTP id DFJ26963; Sun, 28 Feb 2016 19:20:45 +0800 (CST) Received: from HGHY1Z002260041.china.huawei.com (10.177.16.142) by szxeml432-hub.china.huawei.com (10.82.67.209) with Microsoft SMTP Server id 14.3.235.1; Sun, 28 Feb 2016 19:20:31 +0800 From: Shannon Zhao To: Date: Sun, 28 Feb 2016 19:19:16 +0800 Message-ID: <1456658360-16080-21-git-send-email-zhaoshenglong@huawei.com> X-Mailer: git-send-email 1.9.0.msysgit.0 In-Reply-To: <1456658360-16080-1-git-send-email-zhaoshenglong@huawei.com> References: <1456658360-16080-1-git-send-email-zhaoshenglong@huawei.com> MIME-Version: 1.0 X-Originating-IP: [10.177.16.142] X-CFilter-Loop: Reflected X-Mirapoint-Virus-RAPID-Raw: score=unknown(0), refid=str=0001.0A020201.56D2D80D.007B, ss=1, re=0.000, recu=0.000, reip=0.000, cl=1, cld=1, fgs=0, ip=0.0.0.0, so=2013-06-18 04:22:30, dmn=2013-03-21 17:37:32 X-Mirapoint-Loop-Id: 0d44ab242a2c31f5382de7529f56936e Cc: peter.huangpeng@huawei.com, zhaoshenglong@huawei.com, stefano.stabellini@citrix.com, ian.campbell@citrix.com, shannon.zhao@linaro.org Subject: [Xen-devel] [PATCH v4 20/24] arm/acpi: Permit MMIO access of Xen unused devices for Dom0 X-BeenThere: xen-devel@lists.xen.org X-Mailman-Version: 2.1.18 Precedence: list List-Id: Xen developer discussion List-Unsubscribe: , List-Post: List-Help: List-Subscribe: , Errors-To: xen-devel-bounces@lists.xen.org Sender: "Xen-devel" From: Shannon Zhao Firstly it permits full MMIO capabilities for Dom0. Then deny MMIO access of Xen used devices, such as UART, SMMU. Currently, it only denies the MMIO access of UART and for other Xen used devices it could be added later when they are supported. Signed-off-by: Shannon Zhao --- v4: add comments for TODO --- xen/arch/arm/domain_build.c | 31 +++++++++++++++++++++++++++++++ 1 file changed, 31 insertions(+) diff --git a/xen/arch/arm/domain_build.c b/xen/arch/arm/domain_build.c index 4aaffae..7750798 100644 --- a/xen/arch/arm/domain_build.c +++ b/xen/arch/arm/domain_build.c @@ -1359,6 +1359,33 @@ static int prepare_dtb(struct domain *d, struct kernel_info *kinfo) #ifdef CONFIG_ACPI #define ACPI_DOM0_FDT_MIN_SIZE 4096 +static int acpi_iomem_deny_access(struct domain *d) +{ + acpi_status status; + struct acpi_table_spcr *spcr=NULL; + unsigned long gfn; + int rc; + + /* Firstly permit full MMIO capabilities. */ + rc = iomem_permit_access(d, 0UL, ~0UL); + if (rc) + return rc; + + /* TODO: Deny MMIO access for SMMU, GIC ITS */ + status = acpi_get_table(ACPI_SIG_SPCR, 0, + (struct acpi_table_header **)&spcr); + + if ( ACPI_FAILURE(status) ) + { + printk("Failed to get SPCR table\n"); + return -EINVAL; + } + + gfn = spcr->serial_port.address >> PAGE_SHIFT; + /* Deny MMIO access for UART */ + return iomem_deny_access(d, gfn, gfn + 1); +} + static int acpi_permit_spi_access(struct domain *d) { int i, res; @@ -1880,6 +1907,10 @@ static int prepare_acpi(struct domain *d, struct kernel_info *kinfo) if ( rc != 0 ) return rc; + rc = acpi_iomem_deny_access(d); + if ( rc != 0 ) + return rc; + return 0; } #else