On Fri, May 24, 2013 at 11:24:26AM -0600, Alex Williamson wrote: > 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.
I took a very very quick look - and I am wondering if there should also be a flag to turn it on/off in ther kernel in such case? Especially in the field if a user finds out that their particular IOMMU chipset might be doing something funky with large-pages ? > > 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(-) > _______________________________________________ > iommu mailing list > iommu@lists.linux-foundation.org > https://lists.linuxfoundation.org/mailman/listinfo/iommu _______________________________________________ iommu mailing list iommu@lists.linux-foundation.org https://lists.linuxfoundation.org/mailman/listinfo/iommu
