[Qemu-devel] [PATCH 0/2] vfio: type1 iommu hugepage support

[Alex Williamson <alex.williamson@redhat.com>]

This series let's the vfio type1 iommu backend take advantage of iommu
large page support.  See patch 2/2 for the details.  This has been
tested on both amd_iommu and intel_iommu, but only my AMD system has
large page support.  I'd appreciate any testing and feedback on other
systems, particularly vt-d systems supporting large pages.  Mapping
efficiency should be improved a bit without iommu hugepages, but I
hope that it's much more noticeable with huge pages, especially for
very large QEMU guests.

This change includes a clarification to the mapping expectations for
users of the type1 iommu, but is compatible with known users and works
with existing QEMU userspace supporting vfio.  Thanks,

Alex

---

Alex Williamson (2):
      vfio: Convert type1 iommu to use rbtree
      vfio: hugepage support for vfio_iommu_type1


 drivers/vfio/vfio_iommu_type1.c |  607 ++++++++++++++++++++++++---------------
 include/uapi/linux/vfio.h       |    8 -
 2 files changed, 387 insertions(+), 228 deletions(-)