From patchwork Tue Jul 30 13:44:19 2019 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-Patchwork-Submitter: Paul Durrant X-Patchwork-Id: 11065839 Return-Path: Received: from mail.wl.linuxfoundation.org (pdx-wl-mail.web.codeaurora.org [172.30.200.125]) by pdx-korg-patchwork-2.web.codeaurora.org (Postfix) with ESMTP id D4C77174A for ; Tue, 30 Jul 2019 13:46:00 +0000 (UTC) Received: from mail.wl.linuxfoundation.org (localhost [127.0.0.1]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id C38CF2003F for ; Tue, 30 Jul 2019 13:46:00 +0000 (UTC) Received: by mail.wl.linuxfoundation.org (Postfix, from userid 486) id B7F332858F; Tue, 30 Jul 2019 13:46:00 +0000 (UTC) X-Spam-Checker-Version: SpamAssassin 3.3.1 (2010-03-16) on pdx-wl-mail.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-5.2 required=2.0 tests=BAYES_00,MAILING_LIST_MULTI, RCVD_IN_DNSWL_MED autolearn=ham version=3.3.1 Received: from lists.xenproject.org (lists.xenproject.org [192.237.175.120]) (using TLSv1.2 with cipher AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.wl.linuxfoundation.org (Postfix) with ESMTPS id B63232842D for ; Tue, 30 Jul 2019 13:45:59 +0000 (UTC) Received: from localhost ([127.0.0.1] helo=lists.xenproject.org) by lists.xenproject.org with esmtp (Exim 4.89) (envelope-from ) id 1hsSQc-0005Cg-J2; Tue, 30 Jul 2019 13:44:34 +0000 Received: from us1-rack-dfw2.inumbo.com ([104.130.134.6]) by lists.xenproject.org with esmtp (Exim 4.89) (envelope-from ) id 1hsSQa-0005B3-W8 for xen-devel@lists.xenproject.org; Tue, 30 Jul 2019 13:44:33 +0000 X-Inumbo-ID: 2806ec86-b2d0-11e9-8980-bc764e045a96 Received: from esa4.hc3370-68.iphmx.com (unknown [216.71.155.144]) by us1-rack-dfw2.inumbo.com (Halon) with ESMTPS id 2806ec86-b2d0-11e9-8980-bc764e045a96; Tue, 30 Jul 2019 13:44:30 +0000 (UTC) Authentication-Results: esa4.hc3370-68.iphmx.com; dkim=none (message not signed) header.i=none; spf=None smtp.pra=paul.durrant@citrix.com; spf=Pass smtp.mailfrom=Paul.Durrant@citrix.com; spf=None smtp.helo=postmaster@mail.citrix.com Received-SPF: None (esa4.hc3370-68.iphmx.com: no sender authenticity information available from domain of paul.durrant@citrix.com) identity=pra; client-ip=162.221.158.21; receiver=esa4.hc3370-68.iphmx.com; envelope-from="Paul.Durrant@citrix.com"; x-sender="paul.durrant@citrix.com"; x-conformance=sidf_compatible Received-SPF: Pass (esa4.hc3370-68.iphmx.com: domain of Paul.Durrant@citrix.com designates 162.221.158.21 as permitted sender) identity=mailfrom; client-ip=162.221.158.21; receiver=esa4.hc3370-68.iphmx.com; envelope-from="Paul.Durrant@citrix.com"; x-sender="Paul.Durrant@citrix.com"; x-conformance=sidf_compatible; x-record-type="v=spf1"; x-record-text="v=spf1 ip4:209.167.231.154 ip4:178.63.86.133 ip4:195.66.111.40/30 ip4:85.115.9.32/28 ip4:199.102.83.4 ip4:192.28.146.160 ip4:192.28.146.107 ip4:216.52.6.88 ip4:216.52.6.188 ip4:162.221.158.21 ip4:162.221.156.83 ~all" Received-SPF: None (esa4.hc3370-68.iphmx.com: no sender authenticity information available from domain of postmaster@mail.citrix.com) identity=helo; client-ip=162.221.158.21; receiver=esa4.hc3370-68.iphmx.com; envelope-from="Paul.Durrant@citrix.com"; x-sender="postmaster@mail.citrix.com"; x-conformance=sidf_compatible IronPort-SDR: dt9CKyPUHyXyPon9yNfp+SXuYqWeodB7GHVXt+czIYrjDKf9gqYYj0bpfBpM/Zs1tHo1HIgb7E QHWEqFYOjrxzgdr/Sr1A/DFIO+AIQOILjRGzvYox0/hGjxVqXHTpUxPo8gqvyOuW9wF/huTqSv 5ulLHqjYAcxoFU1ViUUcVpswxjZxE6Zl7EKS6u60syYO4fYzaKAxEZ29hyTrF3of3CuyYBOcg1 iMjLwciQLSmh3hyDXN/5O2qq+ECaxtdCzOj+AJKd7n7/MJZ4w0wqZqxyuKAxGfV0kUAjOny+Vp 3/U= X-SBRS: 2.7 X-MesageID: 3760812 X-Ironport-Server: esa4.hc3370-68.iphmx.com X-Remote-IP: 162.221.158.21 X-Policy: $RELAYED X-IronPort-AV: E=Sophos;i="5.64,326,1559534400"; d="scan'208";a="3760812" From: Paul Durrant To: Date: Tue, 30 Jul 2019 14:44:19 +0100 Message-ID: <20190730134419.2739-7-paul.durrant@citrix.com> X-Mailer: git-send-email 2.20.1.2.gb21ebb671 In-Reply-To: <20190730134419.2739-1-paul.durrant@citrix.com> References: <20190730134419.2739-1-paul.durrant@citrix.com> MIME-Version: 1.0 Subject: [Xen-devel] [PATCH 6/6] introduce a 'passthrough' configuration option to xl.cfg... X-BeenThere: xen-devel@lists.xenproject.org X-Mailman-Version: 2.1.23 Precedence: list List-Id: Xen developer discussion List-Unsubscribe: , List-Post: List-Help: List-Subscribe: , Cc: Stefano Stabellini , Wei Liu , Konrad Rzeszutek Wilk , George Dunlap , Andrew Cooper , Ian Jackson , Tim Deegan , Julien Grall , Paul Durrant , Jan Beulich , Anthony PERARD , Volodymyr Babchuk , =?utf-8?q?Roger_Pau_Monn?= =?utf-8?q?=C3=A9?= Errors-To: xen-devel-bounces@lists.xenproject.org Sender: "Xen-devel" X-Virus-Scanned: ClamAV using ClamSMTP ...and hence the ability to disable IOMMU mappings, and control EPT sharing. This patch introduces a new 'libxl_passthrough' enumeration into libxl_domain_create_info. The value will be set by xl either when it parses a new 'passthrough' option in xl.cfg, or implicitly if there is passthrough hardware specified for the domain. If the value of the passthrough configuration option is 'disabled' then the XEN_DOMCTL_CDF_iommu flag will be clear in the xen_domctl_createdomain flags, thus allowing the toolstack to control whether the domain gets IOMMU mappings or not (where previously they were globally set). If the value of the passthrough configuration option is 'sync_pt' then a new 'iommu_opts' field in xen_domctl_createdomain will be set with the value XEN_DOMCTL_IOMMU_no_sharept. This will override the global default set in iommu_hap_pt_share, thus allowing the toolstack to control whether EPT sharing is used for the domain. NOTE: The call to libxl_get_physinfo() in libxl__domain_make() is left in place to allow attempts to passthrough hardware on a hypervisor with disabled IOMMU support to be rejected early. Signed-off-by: Paul Durrant --- Cc: Ian Jackson Cc: Wei Liu Cc: Andrew Cooper Cc: George Dunlap Cc: Jan Beulich Cc: Julien Grall Cc: Konrad Rzeszutek Wilk Cc: Stefano Stabellini Cc: Tim Deegan Cc: Anthony PERARD Cc: Volodymyr Babchuk Cc: "Roger Pau Monné" --- docs/man/xl.cfg.5.pod.in | 52 +++++++++++++++++++++++++++++++++ tools/libxl/libxl.h | 5 ++++ tools/libxl/libxl_create.c | 16 +++++++++- tools/libxl/libxl_types.idl | 7 +++++ tools/xl/xl_parse.c | 38 ++++++++++++++++++++++++ xen/arch/arm/domain.c | 11 ++++++- xen/arch/x86/domain.c | 3 +- xen/common/domain.c | 7 +++++ xen/drivers/passthrough/iommu.c | 13 ++++++++- xen/include/public/domctl.h | 6 +++- xen/include/xen/iommu.h | 17 +++++++---- 11 files changed, 165 insertions(+), 10 deletions(-) diff --git a/docs/man/xl.cfg.5.pod.in b/docs/man/xl.cfg.5.pod.in index c99d40307e..c669524bec 100644 --- a/docs/man/xl.cfg.5.pod.in +++ b/docs/man/xl.cfg.5.pod.in @@ -605,6 +605,58 @@ option should only be used with a trusted device tree. Note that the partial device tree should avoid using the phandle 65000 which is reserved by the toolstack. +=item B + +Specify whether IOMMU mappings are enabled for the domain and hence whether +it will be enabled for passthrough hardware. Valid values for this option +are: + +=over 4 + +=item B + +IOMMU mappings are disabled for the domain and so hardware may not be +passed through. + +This option is the default if no passthrough hardware is specified +in the domain's configuration. + +=item B + +This option means that IOMMU mappings will be synchronized with the +domain's P2M table as follows: + +For a PV domain, all writable pages assigned to the domain are identity +mapped by MFN in the IOMMU page table. Thus a device driver running in the +domain may program passthrough hardware for DMA using MFN values +(i.e. host/machine frame numbers) looked up in its P2M. + +For an HVM domain, all non-foreign RAM pages present in its P2M will be +mapped by GFN in the IOMMU page table. Thus a device driver running in the +domain may program passthrough hardware using GFN values (i.e. guest +physical frame numbers) without any further translation. + +This option is the default if the domain is PV and passthrough hardware +is specified in the configuration. + +This option is not available on Arm. + +=item B + +This option is unavailable for a PV domain. For an HVM domain, this option +means that the IOMMU will be programmed to directly reference the domain's +P2M table as its page table. From the point of view of a device driver +running in the domain this is functionally equivalent to B but +places less load on the hypervisor and so should generally be selected in +preference. However, the availability of this option is hardware specific +and thus, if it is specified for a domain running on hardware that does +not allow it, B will be used instead. + +This option is the default if the domain is HVM and passthrough hardware +is specified in the configuration. + +=back + =back =head2 Devices diff --git a/tools/libxl/libxl.h b/tools/libxl/libxl.h index 9bacfb97f0..5de7c07a41 100644 --- a/tools/libxl/libxl.h +++ b/tools/libxl/libxl.h @@ -394,6 +394,11 @@ */ #define LIBXL_HAVE_EXTENDED_VKB 1 +/* + * libxl_domain_create_info has libxl_passthrough enumeration. + */ +#define LIBXL_HAVE_CREATEINFO_PASSTHROUGH 1 + /* * libxl ABI compatibility * diff --git a/tools/libxl/libxl_create.c b/tools/libxl/libxl_create.c index feb9f1ce0c..ad5f36484a 100644 --- a/tools/libxl/libxl_create.c +++ b/tools/libxl/libxl_create.c @@ -565,12 +565,26 @@ int libxl__domain_make(libxl__gc *gc, libxl_domain_config *d_config, libxl_defbool_val(info->oos) ? 0 : XEN_DOMCTL_CDF_oos_off; } + LOG(DETAIL, "passthrough: %s", + libxl_passthrough_to_string(info->passthrough)); + rc = libxl_get_physinfo(ctx, &physinfo); if (rc < 0) goto out; - if ( physinfo.cap_hvm_directio ) + if (info->passthrough != LIBXL_PASSTHROUGH_DISABLED) + { + if (!physinfo.cap_hvm_directio) { + LOGED(ERROR, *domid, "passthrough not available"); + rc = ERROR_FAIL; + goto out; + } + create.flags |= XEN_DOMCTL_CDF_iommu; + } + + if (info->passthrough == LIBXL_PASSTHROUGH_SYNC_PT) + create.iommu_opts |= XEN_DOMCTL_IOMMU_no_sharept; /* Ultimately, handle is an array of 16 uint8_t, same as uuid */ libxl_uuid_copy(ctx, (libxl_uuid *)&create.handle, &info->uuid); diff --git a/tools/libxl/libxl_types.idl b/tools/libxl/libxl_types.idl index b61399ce36..7e37de8646 100644 --- a/tools/libxl/libxl_types.idl +++ b/tools/libxl/libxl_types.idl @@ -263,6 +263,12 @@ libxl_vkb_backend = Enumeration("vkb_backend", [ (2, "LINUX") ]) +libxl_passthrough = Enumeration("passthrough", [ + (0, "disabled"), + (1, "sync_pt"), + (2, "share_pt"), + ]) + # # Complex libxl types # @@ -408,6 +414,7 @@ libxl_domain_create_info = Struct("domain_create_info",[ ("pool_name", string), ("run_hotplug_scripts",libxl_defbool), ("driver_domain",libxl_defbool), + ("passthrough", libxl_passthrough), ], dir=DIR_IN) libxl_domain_restore_params = Struct("domain_restore_params", [ diff --git a/tools/xl/xl_parse.c b/tools/xl/xl_parse.c index e105bda2bb..c904604008 100644 --- a/tools/xl/xl_parse.c +++ b/tools/xl/xl_parse.c @@ -2326,6 +2326,44 @@ skip_vfb: } } + if (!xlu_cfg_get_string(config, "passthrough", &buf, 0)) { + libxl_passthrough o; + + e = libxl_passthrough_from_string(buf, &o); + if (e) { + fprintf(stderr, + "ERROR: unknown passthrough option '%s'\n", + buf); + exit(-ERROR_FAIL); + } + + switch (o) { + case LIBXL_PASSTHROUGH_DISABLED: + if (d_config->num_pcidevs || d_config->num_dtdevs) { + fprintf(stderr, + "ERROR: passthrough disabled but devices are specified\n"); + exit(-ERROR_FAIL); + } + case LIBXL_PASSTHROUGH_SHARE_PT: + if (c_info->type == LIBXL_DOMAIN_TYPE_PV) { + fprintf(stderr, + "ERROR: passthrough=\"share_pt\" not valid for PV domain\n"); + exit(-ERROR_FAIL); + } + default: + break; + } + + c_info->passthrough = o; + } else if (d_config->num_pcidevs || d_config->num_dtdevs) { + /* + * Passthrough devices are specified so set an appropriate + * default value. + */ + c_info->passthrough = (c_info->type == LIBXL_DOMAIN_TYPE_PV) ? + LIBXL_PASSTHROUGH_SYNC_PT : LIBXL_PASSTHROUGH_SHARE_PT; + } + if (!xlu_cfg_get_list(config, "usbctrl", &usbctrls, 0, 0)) { d_config->num_usbctrls = 0; d_config->usbctrls = NULL; diff --git a/xen/arch/arm/domain.c b/xen/arch/arm/domain.c index e06bd27dad..233dc4d59d 100644 --- a/xen/arch/arm/domain.c +++ b/xen/arch/arm/domain.c @@ -614,6 +614,14 @@ int arch_sanitise_domain_config(struct xen_domctl_createdomain *config) return -EINVAL; } + /* Always share P2M Table between the CPU and the IOMMU */ + if ( config->iommu_opts & XEN_DOMCTL_IOMMU_no_sharept ) + { + dprintk(XENLOG_INFO, + "Unsupported iommu option: XEN_DOMCTL_IOMMU_no_sharept\n"); + return -EINVAL; + } + /* Fill in the native GIC version, passed back to the toolstack. */ if ( config->arch.gic_version == XEN_DOMCTL_CONFIG_GIC_NATIVE ) { @@ -673,7 +681,8 @@ int arch_domain_create(struct domain *d, ASSERT(config != NULL); - if ( is_iommu_enabled(d) && (rc = iommu_domain_init(d)) != 0 ) + if ( is_iommu_enabled(d) && + (rc = iommu_domain_init(d, config->iommu_opts)) != 0 ) goto fail; if ( (rc = p2m_init(d)) != 0 ) diff --git a/xen/arch/x86/domain.c b/xen/arch/x86/domain.c index 42778099da..4bbd8de663 100644 --- a/xen/arch/x86/domain.c +++ b/xen/arch/x86/domain.c @@ -604,7 +604,8 @@ int arch_domain_create(struct domain *d, if ( (rc = init_domain_irq_mapping(d)) != 0 ) goto fail; - if ( is_iommu_enabled(d) && (rc = iommu_domain_init(d)) != 0 ) + if ( is_iommu_enabled(d) && + (rc = iommu_domain_init(d, config->iommu_opts)) != 0 ) goto fail; psr_domain_init(d); diff --git a/xen/common/domain.c b/xen/common/domain.c index 0df4b47352..b0b9a17a18 100644 --- a/xen/common/domain.c +++ b/xen/common/domain.c @@ -308,6 +308,13 @@ static int sanitise_domain_config(struct xen_domctl_createdomain *config) return -EINVAL; } + if ( !(config->flags & XEN_DOMCTL_CDF_iommu) && config->iommu_opts ) + { + dprintk(XENLOG_INFO, + "IOMMU options specified but IOMMU not enabled\n"); + return -EINVAL; + } + if ( config->max_vcpus < 1 ) { dprintk(XENLOG_INFO, "No vCPUS\n"); diff --git a/xen/drivers/passthrough/iommu.c b/xen/drivers/passthrough/iommu.c index 67855eeed5..1c556e39ab 100644 --- a/xen/drivers/passthrough/iommu.c +++ b/xen/drivers/passthrough/iommu.c @@ -159,7 +159,7 @@ static void __hwdom_init check_hwdom_reqs(struct domain *d) iommu_hwdom_strict = true; } -int iommu_domain_init(struct domain *d) +int iommu_domain_init(struct domain *d, unsigned int opts) { struct domain_iommu *hd = dom_iommu(d); int ret = 0; @@ -176,6 +176,15 @@ int iommu_domain_init(struct domain *d) if ( ret ) return ret; + /* + * Use shared page tables for HAP and IOMMU if the global option + * is enabled (from which we can infer the h/w is capable) and + * the domain options do not disallow it. HAP must, of course, also + * be enabled. + */ + hd->hap_pt_share = hap_enabled(d) && iommu_hap_pt_share && + !(opts & XEN_DOMCTL_IOMMU_no_sharept); + /* * NB: 'relaxed' h/w domains don't need the IOMMU mappings to be kept * in-sync with their assigned pages because all host RAM will be @@ -187,6 +196,8 @@ int iommu_domain_init(struct domain *d) if ( !is_hardware_domain(d) || iommu_hwdom_strict ) hd->need_sync = !iommu_use_hap_pt(d); + ASSERT(!(hd->need_sync && hd->hap_pt_share)); + return 0; } diff --git a/xen/include/public/domctl.h b/xen/include/public/domctl.h index 3f82c78870..ebab653cac 100644 --- a/xen/include/public/domctl.h +++ b/xen/include/public/domctl.h @@ -68,7 +68,11 @@ struct xen_domctl_createdomain { #define _XEN_DOMCTL_CDF_iommu 5 #define XEN_DOMCTL_CDF_iommu (1U<<_XEN_DOMCTL_CDF_iommu) - uint32_t flags; + uint16_t flags; + +#define _XEN_DOMCTL_IOMMU_no_sharept 0 +#define XEN_DOMCTL_IOMMU_no_sharept (1U<<_XEN_DOMCTL_IOMMU_no_sharept) + uint16_t iommu_opts; /* * Various domain limits, which impact the quantity of resources (global diff --git a/xen/include/xen/iommu.h b/xen/include/xen/iommu.h index 45ec6cfe44..40e59a4fbf 100644 --- a/xen/include/xen/iommu.h +++ b/xen/include/xen/iommu.h @@ -67,7 +67,7 @@ extern unsigned int iommu_dev_iotlb_timeout; int iommu_setup(void); int iommu_hardware_setup(void); -int iommu_domain_init(struct domain *d); +int iommu_domain_init(struct domain *d, unsigned int opts); void iommu_hwdom_init(struct domain *d); void iommu_domain_destroy(struct domain *d); @@ -256,10 +256,18 @@ struct domain_iommu { /* Features supported by the IOMMU */ DECLARE_BITMAP(features, IOMMU_FEAT_count); + /* + * Does the guest share HAP mapping with the IOMMU? This is always + * true for ARM systems and may be true for x86 systems where the + * the hardware is capable. + */ + bool hap_pt_share; + /* * Does the guest reqire mappings to be synchonized, to maintain - * the default dfn == pfn map. (See comment on dfn at the top of - * include/xen/mm.h). + * the default dfn == pfn map? (See comment on dfn at the top of + * include/xen/mm.h). Note that hap_pt_share == false does not + * necessarily imply this is true. */ bool need_sync; }; @@ -269,8 +277,7 @@ struct domain_iommu { #define iommu_clear_feature(d, f) clear_bit(f, dom_iommu(d)->features) /* Are we using the domain P2M table as its IOMMU pagetable? */ -#define iommu_use_hap_pt(d) \ - (hap_enabled(d) && is_iommu_enabled(d) && iommu_hap_pt_share) +#define iommu_use_hap_pt(d) (dom_iommu(d)->hap_pt_share) /* Does the IOMMU pagetable need to be kept synchronized with the P2M */ #define need_iommu_pt_sync(d) (dom_iommu(d)->need_sync)