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[Qemu-devel] [0/13] Implement support for guest visible IOMMUs


From: David Gibson
Subject: [Qemu-devel] [0/13] Implement support for guest visible IOMMUs
Date: Fri, 9 Mar 2012 16:01:35 +1100

This patch series introduces a general DMA infrastructure which allows
the emulation of guest-visible IOMMUs.  That is, it provides a
framework by which an IOMMU device can be implemented, such that DMA
from other device emulations will be translated according to the
mappings provided by the IOMMU.

One example IOMMU implementation is included, for the para-virtualized
TCE tables specified by PAPR and used in the pseries machine for both
virtual IO and PCI devices.

This series is an updated and cleaned-up version of patches posted by
Eduard - Gabriel Munteanu some time ago.  Those prompted some
discussion at the time, but no resolution was reached.

The series also converts a number of existing device models to use the
new DMA infrastructure, so they can be used with IOMMUs.  Along with
the pci_dma_*() wrapper functions which are already in, this means
that with this series applied, essentially all PCI devices should work
with an emulated IOMMU, as well as pseries VIO devices.  Other types
of devices would need some further conversion to work with the new
framework, but that should be quite straightforward.

This new version of the series has incorporated feedback from the last
RFC round.  I think it's ready to be considered for merge.



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