On Fri, 8 Jul 2016 11:18:22 +0300
David Kiarie <davidkiar...@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 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 <davidkiar...@gmail.com>
> ---
> hw/i386/Makefile.objs | 1 +
> hw/i386/amd_iommu.c | 1384
> +++++++++++++++++++++++++++++++++++++++++++++++++
> hw/i386/amd_iommu.h | 285 ++++++++++
> 3 files changed, 1670 insertions(+)
> create mode 100644 hw/i386/amd_iommu.c
> create mode 100644 hw/i386/amd_iommu.h
Hi,
Please consider an update or follow-on patch which adds something
similar to:
commit 3cb3b1549f5401dc3a5e1d073e34063dc274136f
Author: Alex Williamson <alex.william...@redhat.com>
Date: Thu Jun 30 13:00:24 2016 -0600
intel_iommu: Throw hw_error on notify_started
http://git.qemu.org/?p=qemu.git;a=commit;h=3cb3b1549f5401dc3a5e1d073e34063dc274136f
This would simply make amd_iommu incompatible with device assignment
until someone tackles adding the proper code to support it. Thanks,
Alex
