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[Qemu-devel] [PATCH v3 00/13] IOMMU: Enable interrupt remapping for Inte

From: Peter Xu
Subject: [Qemu-devel] [PATCH v3 00/13] IOMMU: Enable interrupt remapping for Intel IOMMU
Date: Fri, 15 Apr 2016 11:31:26 +0800

v3 changes (all patch numbers corresponds to v2):
- patch 1 (-> v3 patch 13)
  - move to the end of series [Alex]
- patch 10 (dropped)
  - drop this one, since re-worked on IOAPIC support, so we do not
    need this any more.
- patch 12 (-> v3 patch 10)
  - leverage MSI path for IOAPIC IR [Jan]
- patch 13 (v3 -> patch 9)
  - remove vtd_interrupt_remap_msi() declaration by reordering the
    functions [mst]
  - vtd_generate_msi_message(): init msg using {}, remove FIXME
- new patches
  - v3 patch 11: introduce ioapic_entry_parse() helper function
  - v3 patch 12: add support for kernel-irqchip=split. This needs
    more reviews, logically this should enable lots of things:
        splitted irqchip, irqfd, vhost, and irqfd support for
        passthrough devices (not tested). Please refer to the patch for
        more information.

v2 changes:
- patch 1
  - rename "int_remap" to "intr" in several places [Marcel]
  - remove "Intel" specific words in desc or commit message, prepare
    itself with further AMD support [Marcel]
  - avoid using object_property_get_bool() [Marcel]
- patch 5
  - use PCI bus number 0xff rather than 0xf0 for the IOAPIC scope
    definition. (please let me know if anyone knows how I can avoid
        user using PCI bus number 0xff... TIA)
- patch 11
  - fix comments [Marcel]
- all
  - remove intr_supported variable [Marcel]

This patchset provide very basic functionalities for interrupt
remapping (IR) support of the emulated Intel IOMMU device.

By default, IR is disabled to be better compatible with current
QEMU. To enable IR, we can using the following command to boot a
IR-supported VM with virtio-net device with vhost (still do not
support kvm-ioapic, so we need to specify kernel-irqchip={split|off}

$ qemu-system-x86_64 -M q35,iommu=on,intr=on,kernel-irqchip=split \
     -enable-kvm -m 1024 \
         -netdev tap,id=net0,vhost=on \
     -device virtio-net-pci,netdev=user.0 \
     -monitor telnet::3333,server,nowait \

When guest boots, we can verify whether IR enabled by grepping the
dmesg like:

address@hidden ~]# journalctl -k | grep "DMAR-IR"
Feb 19 11:21:23 localhost.localdomain kernel: DMAR-IR: IOAPIC id 0 under DRHD 
base  0xfed90000 IOMMU 0
Feb 19 11:21:23 localhost.localdomain kernel: DMAR-IR: Enabled IRQ remapping in 
xapic mode

Currently supported devices:

- Emulated/Splitted irqchip
- Generic PCI Devices
- vhost devices
- pass through device support? Not tested, but suppose it should work.

TODO List:

- kvm-ioapic support (?)
- EIM support
- IR fault reporting
- source-id validation for IRTE
- IRTE cache and better queued invalidation
- migration support (for IOMMU as general?)
- more?

Peter Xu (13):
  intel_iommu: allow queued invalidation for IR
  intel_iommu: set IR bit for ECAP register
  acpi: add DMAR scope definition for root IOAPIC
  intel_iommu: define interrupt remap table addr register
  intel_iommu: handle interrupt remap enable
  intel_iommu: define several structs for IOMMU IR
  intel_iommu: provide helper function vtd_get_iommu
  intel_iommu: add IR translation faults defines
  intel_iommu: Add support for PCI MSI remap
  q35: ioapic: add support for emulated IOAPIC IR
  ioapic: introduce ioapic_entry_parse() helper
  q35: ioapic: add support for split irqchip and irqfd
  q35: add "int-remap" flag to enable intr

 hw/core/machine.c                 |  20 +++
 hw/i386/acpi-build.c              |  24 ++-
 hw/i386/intel_iommu.c             | 343 +++++++++++++++++++++++++++++++++++++-
 hw/i386/intel_iommu_internal.h    |  23 +++
 hw/i386/pc.c                      |   3 +
 hw/intc/ioapic.c                  | 116 ++++++++-----
 hw/intc/ioapic_common.c           |   4 +
 hw/pci-host/q35.c                 |   4 +
 include/hw/acpi/acpi-defs.h       |  15 ++
 include/hw/i386/apic-msidef.h     |   1 +
 include/hw/i386/intel_iommu.h     | 117 +++++++++++++
 include/hw/i386/ioapic_internal.h |   6 +
 include/hw/i386/pc.h              |   4 +
 include/hw/pci-host/q35.h         |   9 +
 14 files changed, 635 insertions(+), 54 deletions(-)


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