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[Qemu-devel] [RFC v1 0/3] intel_iommu: support scalable mode

From: Yi Sun
Subject: [Qemu-devel] [RFC v1 0/3] intel_iommu: support scalable mode
Date: Wed, 30 Jan 2019 13:09:10 +0800

Intel vt-d rev3.0 [1] introduces a new translation mode called
'scalable mode', which enables PASID-granular translations for
first level, second level, nested and pass-through modes. The
vt-d scalable mode is the key ingredient to enable Scalable I/O
Virtualization (Scalable IOV) [2] [3], which allows sharing a
device in minimal possible granularity (ADI - Assignable Device
Interface). As a result, previous Extended Context (ECS) mode
is deprecated (no production ever implements ECS).

This patch set emulates a minimal capability set of VT-d scalable
mode, equivalent to what is available in VT-d legacy mode today:
    1. Scalable mode root entry, context entry and PASID table
    2. Seconds level translation under scalable mode
    3. Queued invalidation (with 256 bits descriptor)
    4. Pass-through mode

Corresponding intel-iommu driver support will be included in
kernel 5.0:

We will add emulation of full scalable mode capability along with
guest iommu driver progress later, e.g.:
    1. First level translation
    2. Nested translation
    3. Per-PASID invalidation descriptors
    4. Page request services for handling recoverable faults

[3] https://schd.ws/hosted_files/lc32018/00/LC3-SIOV-final.pdf

Liu, Yi L (2):
  intel_iommu: scalable mode emulation
  intel_iommu: add 256 bits qi_desc support

Yi Sun (1):
  intel_iommu: add scalable-mode option to make scalable mode work

 hw/i386/intel_iommu.c          | 732 ++++++++++++++++++++++++++++++++---------
 hw/i386/intel_iommu_internal.h |  57 +++-
 hw/i386/trace-events           |   2 +-
 include/hw/i386/intel_iommu.h  |  20 +-
 4 files changed, 644 insertions(+), 167 deletions(-)


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