Hi Dennis On 20/07/2016 11:56, Dennis Chen wrote: > Hi Eric, > > On Tue, Jul 19, 2016 at 12:55:03PM +0000, Eric Auger wrote: >> This series introduces the msi-iommu api used to: >> >> - allocate/free resources for MSI IOMMU mapping >> - set the MSI iova window aperture >> - map/unmap physical addresses onto MSI IOVAs. >> - determine whether an msi needs to be iommu mapped >> - overwrite an msi_msg PA address with its pre-allocated/mapped IOVA >> >> Also a new iommu domain attribute, DOMAIN_ATTR_MSI_GEOMETRY is introduced >> to report the MSI iova window geometry (aperture and iommu-msi API support). >> >> Currently: >> - iommu driver is supposed to allocate/free MSI mapping resources >> - VFIO subsystem is supposed to set the MSI IOVA aperture. >> - The MSI layer is supposed to allocate/free iova mappings and overwrite >> msi_msg with IOVA at composition time >> >> More details & context can be found at: >> http://www.linaro.org/blog/core-dump/kvm-pciemsi-passthrough-armarm64/ >> >> Best Regards >> >> Eric >> >> Git: complete series available at >> https://github.com/eauger/linux/tree/v4.7-rc7-passthrough-v11 >> > Why can't I find this new series on your git tree: > https://git.linaro.org/people/eric.auger/linux.git you are not looking at the right git repo: see github one above. > ? > Also, do I need to download all the 3-part patches to test the PCIe NIC passthru > as I did on your v9 series? Yes you need to take the 3 parts. You should have everything that is needed on the above branch. In case you do not work on Cavium, you should not cherry-pick "vfio: pci: HACK! workaround thunderx pci_try_reset_bus crash" Thanks Eric > > Thanks, > Dennis >> >> see part III for wrap-up details. >> >> History: >> v10 -> v11: >> - no change in the series, just incremented for consistency >> - added a temporary patch in the branch: >> "iommu/iova: FIXUP! validate iova_domain input to put_iova_domain" >> originally sent by Nate and adapted for this use case. This is currently >> under discussion on the ML. The crash typically occurs in case unsafe >> interrupts are discovered while allow_unsafe_interrupts is not set. >> >> v9 -> v10: >> - split error management in iommu_msi_set_aperture >> >> v8 -> v9: >> - rename iommu_domain_msi_geometry programmable flag into iommu_msi_supported >> - introduce msi_apperture_valid helper and use this instead of is_aperture_set >> >> v7 -> v8: >> - The API is retargetted for MSI: renamed msi-iommu >> all "dma-reserved" namings removed >> - now implemented upon dma-iommu (get, put, init), ie. reuse iova_cookie, >> and iova API >> - msi mapping resources now are guaranteed to exist during the whole iommu >> domain's lifetime. No need to lock to garantee the cookie integrity >> - removed alloc/free_reserved_reserved_iova_domain. We now have a single >> function that sets the aperture, looking like iommu_dma_init_domain. >> - we now use a list instead of an RB-tree >> - prot is not propagated anymore at domain creation due to the retargetting >> for MSI >> - iommu_domain pointer removed from doorbell_mapping struct >> - replaced DOMAIN_ATTR_MSI_MAPPING by DOMAIN_ATTR_MSI_GEOMETRY >> >> v6 -> v7: >> - fixed known lock bugs and multiple page sized slots matching >> (I only have a single MSI frame made of a single page) >> - reserved_iova_cookie now pointing to a struct that encapsulates the >> iova domain handle + protection attribute passed from VFIO (Alex' req) >> - 2 new functions exposed: iommu_msi_mapping_translate_msg, >> iommu_msi_mapping_desc_to_domain: not sure this is the right location/proto >> though >> - iommu_put_reserved_iova now takes a phys_addr_t >> - everything now is cleanup on iommu_domain destruction >> >> RFC v5 -> patch v6: >> - split to ease the review process >> - in dma-reserved-api use a spin lock instead of a mutex (reported by >> Jean-Philippe) >> - revisit iommu_get_reserved_iova API to pass a size parameter upon >> Marc's request >> - Consistently use the page order passed when creating the iova domain. >> - init reserved_binding_list (reported by Julien) >> >> RFC v4 -> RFC v5: >> - take into account Thomas' comments on MSI related patches >> - split "msi: IOMMU map the doorbell address when needed" >> - increase readability and add comments >> - fix style issues >> - split "iommu: Add DOMAIN_ATTR_MSI_MAPPING attribute" >> - platform ITS now advertises IOMMU_CAP_INTR_REMAP >> - fix compilation issue with CONFIG_IOMMU API unset >> - arm-smmu-v3 now advertises DOMAIN_ATTR_MSI_MAPPING >> >> RFC v3 -> v4: >> - Move doorbell mapping/unmapping in msi.c >> - fix ref count issue on set_affinity: in case of a change in the address >> the previous address is decremented >> - doorbell map/unmap now is done on msi composition. Should allow the use >> case for platform MSI controllers >> - create dma-reserved-iommu.h/c exposing/implementing a new API dedicated >> to reserved IOVA management (looking like dma-iommu glue) >> - series reordering to ease the review: >> - first part is related to IOMMU >> - second related to MSI sub-system >> - third related to VFIO (except arm-smmu IOMMU_CAP_INTR_REMAP removal) >> - expose the number of requested IOVA pages through VFIO_IOMMU_GET_INFO >> [this partially addresses Marc's comments on iommu_get/put_single_reserved >> size/alignment problematic - which I did not ignore - but I don't know >> how much I can do at the moment] >> >> RFC v2 -> RFC v3: >> - should fix wrong handling of some CONFIG combinations: >> CONFIG_IOVA, CONFIG_IOMMU_API, CONFIG_PCI_MSI_IRQ_DOMAIN >> - fix MSI_FLAG_IRQ_REMAPPING setting in GICv3 ITS (although not tested) >> >> PATCH v1 -> RFC v2: >> - reverted to RFC since it looks more reasonable ;-) the code is split >> between VFIO, IOMMU, MSI controller and I am not sure I did the right >> choices. Also API need to be further discussed. >> - iova API usage in arm-smmu.c. >> - MSI controller natively programs the MSI addr with either the PA or IOVA. >> This is not done anymore in vfio-pci driver as suggested by Alex. >> - check irq remapping capability of the group >> >> RFC v1 [2] -> PATCH v1: >> - use the existing dma map/unmap ioctl interface with a flag to register a >> reserved IOVA range. Use the legacy Rb to store this special vfio_dma. >> - a single reserved IOVA contiguous region now is allowed >> - use of an RB tree indexed by PA to store allocated reserved slots >> - use of a vfio_domain iova_domain to manage iova allocation within the >> window provided by the userspace >> - vfio alloc_map/unmap_free take a vfio_group handle >> - vfio_group handle is cached in vfio_pci_device >> - add ref counting to bindings >> - user modality enabled at the end of the series >> >> >> Eric Auger (8): >> iommu: Add iommu_domain_msi_geometry and DOMAIN_ATTR_MSI_GEOMETRY >> iommu/arm-smmu: initialize the msi geometry and advertise iommu-msi >> support >> iommu: introduce an msi cookie >> iommu/msi-iommu: initialization >> iommu/msi-iommu: iommu_msi_[get,put]_doorbell_iova >> iommu/msi-iommu: iommu_msi_domain >> iommu/msi-iommu: iommu_msi_msg_pa_to_va >> iommu/arm-smmu: get/put the msi cookie >> >> drivers/iommu/Kconfig | 7 + >> drivers/iommu/Makefile | 1 + >> drivers/iommu/arm-smmu-v3.c | 18 ++- >> drivers/iommu/arm-smmu.c | 18 ++- >> drivers/iommu/iommu.c | 5 + >> drivers/iommu/msi-iommu.c | 322 ++++++++++++++++++++++++++++++++++++++++++++ >> include/linux/iommu.h | 15 +++ >> include/linux/msi-iommu.h | 144 ++++++++++++++++++++ >> 8 files changed, 522 insertions(+), 8 deletions(-) >> create mode 100644 drivers/iommu/msi-iommu.c >> create mode 100644 include/linux/msi-iommu.h >> >> -- >> 1.9.1 >> >> _______________________________________________ >> kvmarm mailing list >> kvmarm@xxxxxxxxxxxxxxxxxxxxx >> https://lists.cs.columbia.edu/mailman/listinfo/kvmarm >> > -- To unsubscribe from this list: send the line "unsubscribe kvm" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
