linux-kernel - [PATCH 0/2] Reduce IOTLB flush when pass-through dGPU devices

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Date:   Fri, 17 Nov 2017 15:11:18 -0600
From:   Suravee Suthikulpanit <Suravee.Suthikulpanit@....com>
To:     linux-kernel@...r.kernel.org, iommu@...ts.linux-foundation.org
Cc:     joro@...tes.org, jroedel@...e.de, alex.williamson@...hat.com,
        Suravee Suthikulpanit <suravee.suthikulpanit@....com>
Subject: [PATCH 0/2] Reduce IOTLB flush when pass-through dGPU devices

From: Suravee Suthikulpanit <suravee.suthikulpanit@....com>

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 <alex.williamson@...hat.com>
Cc: Joerg Roedel <jroedel@...e.de>

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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1.8.3.1