Re: [Qemu-devel] [V11 1/4] hw/i386: Introduce AMD IOMMU

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

On Sun, 22 May 2016 13:21:51 +0300
David Kiarie <davidkiarie4@gmail.com> wrote:

> Add AMD IOMMU emulaton to Qemu in addition to Intel IOMMU
> The IOMMU does basic translation, error checking and has a
> minimal IOTLB implementation. This IOMMU bypassed the need
> for target aborts by responding with IOMMU_NONE access rights
> and exempts the region 0xfee00000-0xfeefffff from translation
> as it is the q35 interrupt region. We also advertise features
> that are not yet implemented to please the Linux IOMMU driver.
> 
> IOTLB aims at implementing commands on real IOMMUs which is
> essential for debugging and may not offer any performance
> benefits
> 
> Signed-off-by: David Kiarie <davidkiarie4@gmail.com>
> ---
>  hw/i386/Makefile.objs |    1 +
>  hw/i386/amd_iommu.c   | 1401 +++++++++++++++++++++++++++++++++++++++++++++++++
>  hw/i386/amd_iommu.h   |  340 ++++++++++++
>  include/hw/pci/pci.h  |    2 +
>  4 files changed, 1744 insertions(+)
>  create mode 100644 hw/i386/amd_iommu.c
>  create mode 100644 hw/i386/amd_iommu.h

I don't see any callouts to memory_region_notify_iommu() here, so this
won't yet support assigned devices.  Do you have any plans to add that
support?  Thanks,

Alex