From mboxrd@z Thu Jan 1 00:00:00 1970 From: Jean-Philippe Brucker Subject: [PATCH 0/3] virtio-iommu on non-devicetree platforms Date: Fri, 14 Feb 2020 17:04:10 +0100 Message-ID: <20200214160413.1475396-1-jean-philippe@linaro.org> Mime-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Return-path: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: virtualization-bounces@lists.linux-foundation.org Sender: "Virtualization" To: iommu@lists.linux-foundation.org, virtualization@lists.linux-foundation.org, linux-pci@vger.kernel.org Cc: mst@redhat.com, joro@8bytes.org, eric.auger@redhat.com, sebastien.boeuf@intel.com, jacob.jun.pan@intel.com, bhelgaas@google.com List-Id: virtualization@lists.linuxfoundation.org Add topology description to the virtio-iommu driver and enable x86 platforms. Since the RFC [1] I've mostly given up on ACPI tables, since the internal discussions seem to have reached a dead end. The built-in topology description presented here isn't ideal, but it is simple to implement and doesn't impose a dependency on ACPI or device-tree, which can be beneficial to lightweight hypervisors. The built-in description is an array in the virtio config space. The driver parses the config space early and postpones endpoint probe until the virtio-iommu device is ready. Each element in the array describes either a PCI range or a single MMIO endpoint, and their associated endpoint IDs: struct virtio_iommu_topo_pci_range { __le16 type; /* 1: PCI range */ __le16 hierarchy; /* PCI domain number */ __le16 requester_start; /* First BDF */ __le16 requester_end; /* Last BDF */ __le32 endpoint_start; /* First endpoint ID */ }; struct virtio_iommu_topo_endpoint { __le16 type; /* 2: Endpoint */ __le16 reserved; /* 0 */ __le32 endpoint; /* Endpoint ID */ __le64 address; /* First MMIO address */ }; You can find the QEMU patches based on Eric's latest device on my virtio-iommu/devel branch [2]. I test on both x86 q35, and aarch64 virt machine with edk2. [1] https://lore.kernel.org/linux-iommu/20191122105000.800410-1-jean-philippe@linaro.org/ [2] https://jpbrucker.net/git/qemu virtio-iommu/devel Jean-Philippe Brucker (3): iommu/virtio: Add topology description to virtio-iommu config space PCI: Add DMA configuration for virtual platforms iommu/virtio: Enable x86 support MAINTAINERS | 2 + drivers/iommu/Kconfig | 13 +- drivers/iommu/Makefile | 1 + drivers/iommu/virtio-iommu-topology.c | 343 ++++++++++++++++++++++++++ drivers/iommu/virtio-iommu.c | 3 + drivers/pci/pci-driver.c | 5 + include/linux/virt_iommu.h | 19 ++ include/uapi/linux/virtio_iommu.h | 26 ++ 8 files changed, 411 insertions(+), 1 deletion(-) create mode 100644 drivers/iommu/virtio-iommu-topology.c create mode 100644 include/linux/virt_iommu.h -- 2.25.0