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[Qemu-devel] [V12 0/4] AMD IOMMU

From: David Kiarie
Subject: [Qemu-devel] [V12 0/4] AMD IOMMU
Date: Wed, 15 Jun 2016 15:21:48 +0300

Hi all,

This patchset adds basic AMD IOMMU emulation support to Qemu.

Changes since V11
   -AMD IOMMU is not started with -device amd-iommu (with a dependency on 
Marcel's patches).
   -IOMMU commands are represented using bitfields which is less error prone 
and more readable[Peter]
   -Changed from debug fprintfs to tracing[Jan]

Changes since V10
   -Support for huge pages including some obscure AMD IOMMU feature that allows 
default page size override[Jan].
   -Fixed an issue with generation of interrupts. We noted that AMD IOMMU has 
BusMaster- and is therefore not able to generate interrupts like any other PCI 
device. We have resulted in writing directly to system address but this could 
be fixed by some patches which have not been merged yet.

Changes since v9

   -amd_iommu prefixes have been renamed to a shorter 'amdvi' both in the macros
    and in the functions/code. The register macros have not been moved to the 
    implementation file since almost the macros there are basically macros and 
    reckoned renaming them should suffice.
   -taken care of byte order in the use of 'dma_memory_read'[Michael]
   -Taken care of invalid DTE entries to ensure no DMA unless a device is 
configured to allow it.
   -An issue with the emulate IOMMU defaulting to AMD_IOMMU has been 
You can test[1] this patches by starting with parameters 
    qemu-system-x86_64 -M -device amd-iommu -m 2G -enable-kvm -smp 4 -cpu host 
-hda file.img -soundhw ac97 
emulating whatever devices you want.

Not passing any command line parameters to linux should be enough to test this 
patches since the devices are basically
passes-through but to the 'host' (l1 guest). You can still go ahead pass 
command line parameter 'iommu=pt iommu=1'
and try to pass a device to L2 guest. This can also done without passing any 
iommu related parameters to the kernel. 

For convinience:
[1] https://github.com/aslaq/qemu/tree/v12

David Kiarie (4):
  hw/pci: Prepare for AMD IOMMU
  trace-events: Add AMD IOMMU trace events
  hw/i386: Introduce AMD IOMMU
  hw/i386: AMD IOMMU IVRS table

 hw/acpi/aml-build.c         |    2 +-
 hw/i386/Makefile.objs       |    1 +
 hw/i386/acpi-build.c        |   95 ++-
 hw/i386/amd_iommu.c         | 1559 +++++++++++++++++++++++++++++++++++++++++++
 hw/i386/amd_iommu.h         |  287 ++++++++
 include/hw/acpi/acpi-defs.h |   13 +
 include/hw/acpi/aml-build.h |    1 +
 include/hw/pci/pci.h        |    2 +
 trace-events                |   29 +
 9 files changed, 1977 insertions(+), 12 deletions(-)
 create mode 100644 hw/i386/amd_iommu.c
 create mode 100644 hw/i386/amd_iommu.h


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