[PART2 RFC v2 00/10] iommu/AMD: Introduce IOMMU AVIC support

[Suravee Suthikulpanit <suravee.suthikulpanit@amd.com>]

CHANGES FROM V1
===============
  * Rename the new mode from ga to vapic to be consistent with
    the current terminology used in KVM for guest virtual APIC
    (1/10 and 2/10).
  * Rename the member enum amd_iommu_intr_mode_type, and provide
    helper functions (1/10 and 2/10).
  * Re-factor the patch series to separate out the enabling of
    vAPIC interrupt remapping mode (patch 7/10).
  * Re-implement amd_iommu_update_ga() (per Radim's comment) (10/10)

GITHUB
======
Latest git tree can be found at:
    http://github.com/ssuthiku/linux.git    avic_part2_rfc_v2

OVERVIEW
========
This patch set is the second part of the two-part patch series to introduce
the new AMD Advance Virtual Interrupt Controller (AVIC) support.

In addition to the SVM AVIC, AMD IOMMU also extends the AVIC capability
to allow I/O interrupts injection directly into the virtualized guest
local APIC without the need for hypervisor intervention.

This patch series introduces a new hardware interrupt remapping (IR) mode
in AMD IOMMU driver, the Guest Virtual APIC (GA) mode. This is in contrast
to the existing "legacy" mode. The IR mode can be specified with a new
kernel parameter:

    amd_iommu_guest_ir=[vapic (default) | legacy]

When enabling GA mode, the AMD IOMMU driver will configure device interrupt
remapping in GA mode when possible (i.e. SVM AVIC must be enabled, and if
the interrupt types are supported). Otherewise, the driver will fallback
to using the legacy IR mode.

This patch series also introduces new interfaces between SVM and IOMMU
to allow:
  * SVM driver to communicate to IOMMU with updated vcpu scheduling
    information.
  * IOMMU driver to notify SVM driver to schedule vcpu on to physical core
    handle IOMMU GALog entry.

DOCUMENTATIONS
==============
More information about SVM AVIC can be found in the
AMD64 Architecture Programmer’s Manual Volume 2 - System Programming.

    http://support.amd.com/TechDocs/24593.pdf

More information about IOMMU AVIC can be found int the
AMD I/O Virtualization Technology (IOMMU) Specification - Rev 2.62.

    http://support.amd.com/TechDocs/48882_IOMMU.pdf

Any feedback and comments are very much appreciated.

Thank you,
Suravee

Suravee Suthikulpanit (10):
  iommu/amd: Detect and enable guest vAPIC support
  iommu/amd: Add support for 128-bit IRTE
  iommu/amd: Detect and initialize guest vAPIC log
  iommu/amd: Adding GALOG interrupt handler
  iommu/amd: Introduce amd_iommu_update_ga()
  iommu/amd: Implements irq_set_vcpu_affinity() hook to setup vapic mode
    for pass-through devices
  iommu/amd: Enable vAPIC interrupt remapping mode by default
  svm: Introduce AMD IOMMU avic_ga_log_notifier
  svm: Implements update_pi_irte hook to setup posted interrupt
  svm: Update AMD IOMMU IRTE with vcpu scheduling information when
    enable AVIC

 arch/x86/include/asm/kvm_host.h |   2 +
 arch/x86/kvm/svm.c              | 195 +++++++++++++++++-
 drivers/iommu/amd_iommu.c       | 432 +++++++++++++++++++++++++++++++++++-----
 drivers/iommu/amd_iommu_init.c  | 163 ++++++++++++++-
 drivers/iommu/amd_iommu_proto.h |   1 +
 drivers/iommu/amd_iommu_types.h | 138 +++++++++++++
 include/linux/amd-iommu.h       |  24 +++
 7 files changed, 896 insertions(+), 59 deletions(-)

-- 
1.9.1