[PATCH v14 00/16] KVM PCIe/MSI passthrough on ARM/ARM64

From: Eric Auger
Date: Wed Oct 12 2016 - 09:22:46 EST

This is the second respin on top of Robin's series [1], addressing Alex' comments.

Major changes are:
- MSI-doorbell API now is moved to DMA IOMMU API following Alex suggestion
to put all API pieces at the same place (so eventually in the IOMMU
- new iommu_domain_msi_resv struct and accessor through DOMAIN_ATTR_MSI_RESV
domain with mirror VFIO capability
- more robustness I think in the VFIO layer
- added "iommu/iova: fix __alloc_and_insert_iova_range" since with the current
code I failed allocating an IOVA page in a single page domain with upper part

IOVA range exclusion will be handled in a separate series

The priority really is to discuss and freeze the API and especially the MSI
doorbell's handling. Do we agree to put that in DMA IOMMU?

Note: the size computation does not take into account possible page overlaps
between doorbells but it would add quite a lot of complexity i think.

Tested on AMD Overdrive (single GICv2m frame) with I350 VF assignment.

the series depends on Robin's generic-v7 branch:
[1] [PATCH v7 00/22] Generic DT bindings for PCI IOMMUs and ARM SMMU

Best Regards


Git: complete series available at

the above branch includes a temporary patch to work around a ThunderX pci
bus reset crash (which I think unrelated to this series):
"vfio: pci: HACK! workaround thunderx pci_try_reset_bus crash"
Do not take this one for other platforms.

Eric Auger (15):
iommu/iova: fix __alloc_and_insert_iova_range
iommu: Introduce DOMAIN_ATTR_MSI_RESV
iommu/dma: MSI doorbell alloc/free
iommu/dma: Introduce iommu_calc_msi_resv
iommu/arm-smmu: Implement domain_get_attr for DOMAIN_ATTR_MSI_RESV
irqchip/gic-v2m: Register the MSI doorbell
irqchip/gicv3-its: Register the MSI doorbell
vfio: Introduce a vfio_dma type field
vfio/type1: vfio_find_dma accepting a type argument
vfio/type1: Implement recursive vfio_find_dma_from_node
vfio/type1: Handle unmap/unpin and replay for VFIO_IOVA_RESERVED slots
vfio: Allow reserved msi iova registration
vfio/type1: Check doorbell safety
iommu/arm-smmu: Do not advertise IOMMU_CAP_INTR_REMAP
vfio/type1: Introduce MSI_RESV capability

Robin Murphy (1):
iommu/dma: Allow MSI-only cookies

drivers/iommu/Kconfig | 4 +-
drivers/iommu/arm-smmu-v3.c | 10 +-
drivers/iommu/arm-smmu.c | 10 +-
drivers/iommu/dma-iommu.c | 184 ++++++++++++++++++++++++++
drivers/iommu/iova.c | 2 +-
drivers/irqchip/irq-gic-v2m.c | 10 +-
drivers/irqchip/irq-gic-v3-its.c | 13 ++
drivers/vfio/vfio_iommu_type1.c | 279 +++++++++++++++++++++++++++++++++++++--
include/linux/dma-iommu.h | 59 +++++++++
include/linux/iommu.h | 8 ++
include/uapi/linux/vfio.h | 30 ++++-
11 files changed, 587 insertions(+), 22 deletions(-)