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Subject[PATCH v2 00/16] IOMMU driver support for SVM virtualization
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Hi All,

Shared virtual memory (SVM) space between devices and applications can
reduce programming complexity and enhance security. To enable SVM in
the guest, i.e. shared guest application address space and physical
device DMA address, IOMMU driver must provide some new functionalities.

This patchset is a follow-up on the discussions held at LPC 2017
VFIO/IOMMU/PCI track. Slides and notes can be found here:
https://linuxplumbersconf.org/2017/ocw/events/LPC2017/tracks/636

The complete guest SVM support also involves changes in QEMU and VFIO,
which has been posted earlier.
https://www.spinics.net/lists/kvm/msg148798.html

This is the IOMMU portion follow up of the more complete series of the
kernel changes to support vSVM. Please refer to the link below for more
details. https://www.spinics.net/lists/kvm/msg148819.html

Generic APIs are introduced in addition to Intel VT-d specific changes,
the goal is to have common interfaces across IOMMU and device types for
both VFIO and other in-kernel users.

At the top level, new IOMMU interfaces are introduced as follows:
- bind guest PASID table
- passdown invalidations of translation caches
- IOMMU device fault reporting including page request/response and
non-recoverable faults.

For IOMMU detected device fault reporting, struct device is extended to
provide callback and tracking at device level. The original proposal was
discussed here "Error handling for I/O memory management units"
(https://lwn.net/Articles/608914/). I have experimented two alternative
solutions:
1. use a shared group notifier, this does not scale well also causes unwanted
notification traffic when group sibling device is reported with faults.
2. place fault callback at device IOMMU arch data, e.g. device_domain_info
in Intel/FSL IOMMU driver. This will cause code duplication, since per
device fault reporting is generic.

The additional patches are Intel VT-d specific, which either implements or
replaces existing private interfaces with the generic ones.

Changelog:

V2
- Replaced hybrid interface data model (generic data + vendor specific
data) with all generic data. This will have the security benefit where
data passed from user space can be sanitized by all software layers if
needed.
- Addressed review comments from V1
- Use per device fault report data
- Support page request/response communications between host IOMMU and
guest or other in-kernel users.
- Added unrecoverable fault reporting to DMAR
- Use threaded IRQ function for DMAR fault interrupt and fault
reporting

Jacob Pan (15):
iommu: introduce bind_pasid_table API function
iommu/vt-d: add bind_pasid_table function
iommu/vt-d: support flushing more TLB types
iommu/vt-d: add iommu invalidate function
iommu/vt-d: move device_domain_info to header
iommu/vt-d: assign PFSID in device TLB invalidation
iommu: introduce device fault data
driver core: add iommu device fault reporting data
iommu: introduce device fault report API
iommu/vt-d: use threaded irq for dmar_fault
iommu/vt-d: report unrecoverable device faults
iommu/intel-svm: notify page request to guest
iommu/intel-svm: replace dev ops with fault report API
iommu: introduce page response function
iommu/vt-d: add intel iommu page response function

Liu, Yi L (1):
iommu: introduce iommu invalidate API function

drivers/iommu/dmar.c | 151 ++++++++++++++++++-
drivers/iommu/intel-iommu.c | 329 +++++++++++++++++++++++++++++++++++++++---
drivers/iommu/intel-svm.c | 94 ++++++++++--
drivers/iommu/iommu.c | 103 ++++++++++++-
include/linux/device.h | 3 +
include/linux/dma_remapping.h | 1 +
include/linux/intel-iommu.h | 42 +++++-
include/linux/intel-svm.h | 20 +--
include/linux/iommu.h | 172 ++++++++++++++++++++++
include/uapi/linux/iommu.h | 117 +++++++++++++++
10 files changed, 975 insertions(+), 57 deletions(-)
create mode 100644 include/uapi/linux/iommu.h

--
2.7.4

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