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
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 | 398 +++++++
docs/designs/pv-iommu.md | 105 ++
xen/arch/x86/domain.c | 2 +-
xen/arch/x86/include/asm/arena.h | 54 +
xen/arch/x86/include/asm/iommu.h | 44 +-
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 | 320 ++++++
xen/drivers/passthrough/Kconfig | 14 +
xen/drivers/passthrough/Makefile | 3 +
xen/drivers/passthrough/context.c | 626 +++++++++++
xen/drivers/passthrough/iommu.c | 337 ++----
xen/drivers/passthrough/pci.c | 49 +-
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 | 1557 +++++++++++---------------
xen/drivers/passthrough/vtd/quirks.c | 21 +-
xen/drivers/passthrough/x86/Makefile | 1 +
xen/drivers/passthrough/x86/arena.c | 157 +++
xen/drivers/passthrough/x86/iommu.c | 104 +-
xen/include/hypercall-defs.c | 6 +
xen/include/public/pv-iommu.h | 114 ++
xen/include/public/xen.h | 1 +
xen/include/xen/iommu.h | 118 +-
xen/include/xen/pci.h | 3 +
30 files changed, 2822 insertions(+), 1309 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 Intern
XCP-ng & Xen Orchestra - Vates solutions
web: https://vates.tech