[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index] [XEN RFC PATCH v4 0/5] IOMMU subsystem redesign and PV-IOMMU interface
This work has been presented at Xen Summit 2024 during the IOMMU paravirtualization and Xen IOMMU subsystem rework design session. Operating systems may want to have access to a IOMMU in order to do DMA protection or implement certain features (e.g VFIO on Linux). VFIO support is mandatory for framework such as SPDK, which can be useful to implement an alternative storage backend for virtual machines [1]. In this patch series, we introduce in Xen the ability to manage several contexts per domain and provide a new hypercall interface to allow guests to manage IOMMU contexts. The VT-d driver is updated to support these new features. [1] Using SPDK with the Xen hypervisor - FOSDEM 2023 --- Changed in v2 : * fixed Xen crash when dumping IOMMU contexts (using X debug key) with DomUs without IOMMU * s/dettach/detach/ * removed some unused includes * fix dangling devices in contexts with detach Changed in v3 : * lock entirely map/unmap in hypercall * prevent IOMMU operations on dying contexts (fix race condition) * iommu_check_context+iommu_get_context -> iommu_get_context and check for NULL Changed in v4 : * Part of initialization logic is moved to domain or toolstack (IOMMU_init) + domain/toolstack now decides on "context count" and "pagetable pool size" + for now, all domains are able to initialize PV-IOMMU * introduce "dom0-iommu=no-dma" to make default context block all DMA (disables HAP and sync-pt), enforcing usage of PV-IOMMU for DMA Can be used to expose properly "Pre-boot DMA protection" * redesigned locking logic for contexts + contexts are accessed using iommu_get_context and released with iommu_put_context TODO: * add stub implementations for bissecting needs and non-ported IOMMU implementations * fix some issues with no-dma+PV and grants * complete "no-dma" mode (expose to toolstack, add documentation, ...) * properly define nested mode and PASID support Teddy Astie (5): docs/designs: Add a design document for PV-IOMMU docs/designs: Add a design document for IOMMU subsystem redesign IOMMU: Introduce redesigned IOMMU subsystem VT-d: Port IOMMU driver to new subsystem xen/public: Introduce PV-IOMMU hypercall interface docs/designs/iommu-contexts.md | 403 +++++++ docs/designs/pv-iommu.md | 116 ++ xen/arch/x86/domain.c | 2 +- xen/arch/x86/include/asm/arena.h | 54 + xen/arch/x86/include/asm/iommu.h | 58 +- xen/arch/x86/include/asm/pci.h | 17 - xen/arch/x86/mm/p2m-ept.c | 2 +- xen/arch/x86/pv/dom0_build.c | 4 +- xen/arch/x86/tboot.c | 4 +- xen/common/Makefile | 1 + xen/common/memory.c | 4 +- xen/common/pv-iommu.c | 539 ++++++++++ xen/drivers/passthrough/Makefile | 3 + xen/drivers/passthrough/context.c | 711 +++++++++++++ xen/drivers/passthrough/iommu.c | 396 +++---- xen/drivers/passthrough/pci.c | 117 +- xen/drivers/passthrough/quarantine.c | 49 + xen/drivers/passthrough/vtd/Makefile | 2 +- xen/drivers/passthrough/vtd/extern.h | 14 +- xen/drivers/passthrough/vtd/iommu.c | 1478 +++++++++----------------- xen/drivers/passthrough/vtd/quirks.c | 20 +- xen/drivers/passthrough/x86/Makefile | 1 + xen/drivers/passthrough/x86/arena.c | 157 +++ xen/drivers/passthrough/x86/iommu.c | 270 +++-- xen/include/hypercall-defs.c | 6 + xen/include/public/pv-iommu.h | 341 ++++++ xen/include/public/xen.h | 1 + xen/include/xen/iommu.h | 117 +- xen/include/xen/pci.h | 3 + 29 files changed, 3423 insertions(+), 1467 deletions(-) create mode 100644 docs/designs/iommu-contexts.md create mode 100644 docs/designs/pv-iommu.md create mode 100644 xen/arch/x86/include/asm/arena.h create mode 100644 xen/common/pv-iommu.c create mode 100644 xen/drivers/passthrough/context.c create mode 100644 xen/drivers/passthrough/quarantine.c create mode 100644 xen/drivers/passthrough/x86/arena.c create mode 100644 xen/include/public/pv-iommu.h -- 2.45.2 Teddy Astie | Vates XCP-ng Developer XCP-ng & Xen Orchestra - Vates solutions web: https://vates.tech
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