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Sun, 11 Apr 2021 07:13:14 -0400 X-MC-Unique: V9tQZ2CGP_uQGzPeRk-F0w-1 Received: from smtp.corp.redhat.com (int-mx07.intmail.prod.int.phx2.redhat.com [10.5.11.22]) (using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits)) (No client certificate requested) by mimecast-mx01.redhat.com (Postfix) with ESMTPS id D7FB718397A0; Sun, 11 Apr 2021 11:13:10 +0000 (UTC) Received: from laptop.redhat.com (ovpn-112-22.ams2.redhat.com [10.36.112.22]) by smtp.corp.redhat.com (Postfix) with ESMTP id BEA3A100164A; Sun, 11 Apr 2021 11:12:57 +0000 (UTC) From: Eric Auger To: eric.auger.pro@gmail.com, eric.auger@redhat.com, iommu@lists.linux-foundation.org, linux-kernel@vger.kernel.org, kvm@vger.kernel.org, kvmarm@lists.cs.columbia.edu, will@kernel.org, maz@kernel.org, robin.murphy@arm.com, joro@8bytes.org, alex.williamson@redhat.com, tn@semihalf.com, zhukeqian1@huawei.com Subject: [PATCH v15 02/12] iommu: Introduce bind/unbind_guest_msi Date: Sun, 11 Apr 2021 13:12:18 +0200 Message-Id: <20210411111228.14386-3-eric.auger@redhat.com> In-Reply-To: <20210411111228.14386-1-eric.auger@redhat.com> References: <20210411111228.14386-1-eric.auger@redhat.com> MIME-Version: 1.0 X-Scanned-By: MIMEDefang 2.84 on 10.5.11.22 Cc: jean-philippe@linaro.org, wangxingang5@huawei.com, lushenming@huawei.com, vivek.gautam@arm.com, vsethi@nvidia.com, zhangfei.gao@linaro.org, jiangkunkun@huawei.com X-BeenThere: iommu@lists.linux-foundation.org X-Mailman-Version: 2.1.15 Precedence: list List-Id: Development issues for Linux IOMMU support List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Errors-To: iommu-bounces@lists.linux-foundation.org Sender: "iommu" On ARM, MSI are translated by the SMMU. An IOVA is allocated for each MSI doorbell. If both the host and the guest are exposed with SMMUs, we end up with 2 different IOVAs allocated by each. guest allocates an IOVA (gIOVA) to map onto the guest MSI doorbell (gDB). The Host allocates another IOVA (hIOVA) to map onto the physical doorbell (hDB). So we end up with 2 untied mappings: S1 S2 gIOVA -> gDB hIOVA -> hDB Currently the PCI device is programmed by the host with hIOVA as MSI doorbell. So this does not work. This patch introduces an API to pass gIOVA/gDB to the host so that gIOVA can be reused by the host instead of re-allocating a new IOVA. So the goal is to create the following nested mapping: S1 S2 gIOVA -> gDB -> hDB and program the PCI device with gIOVA MSI doorbell. In case we have several devices attached to this nested domain (devices belonging to the same group), they cannot be isolated on guest side either. So they should also end up in the same domain on guest side. We will enforce that all the devices attached to the host iommu domain use the same physical doorbell and similarly a single virtual doorbell mapping gets registered (1 single virtual doorbell is used on guest as well). Signed-off-by: Eric Auger --- v13 -> v14: - s/iova/giova in iommu_unbind_guest_msi proto (Kequian) v7 -> v8: - dummy iommu_unbind_guest_msi turned into a void function v6 -> v7: - remove the device handle parameter. - Add comments saying there can only be a single MSI binding registered per iommu_domain v5 -> v6: -fix compile issue when IOMMU_API is not set v3 -> v4: - add unbind v2 -> v3: - add a struct device handle --- drivers/iommu/iommu.c | 37 +++++++++++++++++++++++++++++++++++++ include/linux/iommu.h | 20 ++++++++++++++++++++ 2 files changed, 57 insertions(+) diff --git a/drivers/iommu/iommu.c b/drivers/iommu/iommu.c index 90bacf000789..1853279216eb 100644 --- a/drivers/iommu/iommu.c +++ b/drivers/iommu/iommu.c @@ -2282,6 +2282,43 @@ static void __iommu_detach_device(struct iommu_domain *domain, trace_detach_device_from_domain(dev); } +/** + * iommu_bind_guest_msi - Passes the stage1 GIOVA/GPA mapping of a + * virtual doorbell + * + * @domain: iommu domain the stage 1 mapping will be attached to + * @iova: iova allocated by the guest + * @gpa: guest physical address of the virtual doorbell + * @size: granule size used for the mapping + * + * The associated IOVA can be reused by the host to create a nested + * stage2 binding mapping translating into the physical doorbell used + * by the devices attached to the domain. + * + * All devices within the domain must share the same physical doorbell. + * A single MSI GIOVA/GPA mapping can be attached to an iommu_domain. + */ + +int iommu_bind_guest_msi(struct iommu_domain *domain, + dma_addr_t giova, phys_addr_t gpa, size_t size) +{ + if (unlikely(!domain->ops->bind_guest_msi)) + return -ENODEV; + + return domain->ops->bind_guest_msi(domain, giova, gpa, size); +} +EXPORT_SYMBOL_GPL(iommu_bind_guest_msi); + +void iommu_unbind_guest_msi(struct iommu_domain *domain, + dma_addr_t giova) +{ + if (unlikely(!domain->ops->unbind_guest_msi)) + return; + + domain->ops->unbind_guest_msi(domain, giova); +} +EXPORT_SYMBOL_GPL(iommu_unbind_guest_msi); + void iommu_detach_device(struct iommu_domain *domain, struct device *dev) { struct iommu_group *group; diff --git a/include/linux/iommu.h b/include/linux/iommu.h index c4422975359e..72bda5d93951 100644 --- a/include/linux/iommu.h +++ b/include/linux/iommu.h @@ -241,6 +241,8 @@ struct iommu_iotlb_gather { * @sva_unbind_gpasid: unbind guest pasid and mm * @attach_pasid_table: attach a pasid table * @detach_pasid_table: detach the pasid table + * @bind_guest_msi: provides a stage1 giova/gpa MSI doorbell mapping + * @unbind_guest_msi: withdraw a stage1 giova/gpa MSI doorbell mapping * @def_domain_type: device default domain type, return value: * - IOMMU_DOMAIN_IDENTITY: must use an identity domain * - IOMMU_DOMAIN_DMA: must use a dma domain @@ -322,6 +324,10 @@ struct iommu_ops { int (*def_domain_type)(struct device *dev); + int (*bind_guest_msi)(struct iommu_domain *domain, + dma_addr_t giova, phys_addr_t gpa, size_t size); + void (*unbind_guest_msi)(struct iommu_domain *domain, dma_addr_t giova); + unsigned long pgsize_bitmap; struct module *owner; }; @@ -464,6 +470,10 @@ extern int iommu_attach_pasid_table(struct iommu_domain *domain, extern int iommu_uapi_attach_pasid_table(struct iommu_domain *domain, void __user *udata); extern void iommu_detach_pasid_table(struct iommu_domain *domain); +extern int iommu_bind_guest_msi(struct iommu_domain *domain, + dma_addr_t giova, phys_addr_t gpa, size_t size); +extern void iommu_unbind_guest_msi(struct iommu_domain *domain, + dma_addr_t giova); extern struct iommu_domain *iommu_get_domain_for_dev(struct device *dev); extern struct iommu_domain *iommu_get_dma_domain(struct device *dev); extern int iommu_map(struct iommu_domain *domain, unsigned long iova, @@ -1101,6 +1111,16 @@ static inline struct iommu_fwspec *dev_iommu_fwspec_get(struct device *dev) { return NULL; } + +static inline +int iommu_bind_guest_msi(struct iommu_domain *domain, + dma_addr_t giova, phys_addr_t gpa, size_t size) +{ + return -ENODEV; +} +static inline +void iommu_unbind_guest_msi(struct iommu_domain *domain, dma_addr_t giova) {} + #endif /* CONFIG_IOMMU_API */ /** -- 2.26.3 _______________________________________________ iommu mailing list iommu@lists.linux-foundation.org https://lists.linuxfoundation.org/mailman/listinfo/iommu