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Subject[PATCH 0/2] Reduce IOTLB flush when pass-through dGPU devices
From: Suravee Suthikulpanit <>

Currently, when pass-through dGPU to a guest VM, there are thousands
of IOTLB flush commands sent from IOMMU to end-point-device. This cause
performance issue when launching new VMs, and could cause IOTLB invalidate
time-out issue on certain dGPUs.

This can be avoided by adopting the new fast IOTLB flush APIs.

Cc: Alex Williamson <>
Cc: Joerg Roedel <>

Suravee Suthikulpanit (2):
vfio/type1: Adopt fast IOTLB flush interface when unmap IOVAs
iommu/amd: Add support for fast IOTLB flushing

drivers/iommu/amd_iommu.c | 77 ++++++++++++++++++++++++++++++++++++++++-
drivers/iommu/amd_iommu_init.c | 2 --
drivers/iommu/amd_iommu_types.h | 2 ++
drivers/vfio/vfio_iommu_type1.c | 12 +++++--
4 files changed, 87 insertions(+), 6 deletions(-)


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