[PATCH 00/18] Shared virtual address IOMMU and VT-d support

Jacob Pan
2019-04-08T23:59:15Z

Shared virtual address (SVA), a.k.a, Shared virtual memory (SVM) on Intel
platforms allow address space sharing between device DMA and applications.
SVA can reduce programming complexity and enhance security.
This series is intended to enable SVA virtualization, i.e. shared guest
application address space and physical device DMA address. Only IOMMU portion
of the changes are included in this series. Additional support is needed in
VFIO and QEMU (will be submitted separately) to complete this functionality.

To make incremental changes and reduce the size of each patchset. This series
does not inlcude support for page request services.

In VT-d implementation, PASID table is per device and maintained in the host.
Guest PASID table is shadowed in VMM where virtual IOMMU is emulated.

.-------------. .---------------------------.
| vIOMMU | | Guest process CR3, FL only|
| | '---------------------------'
.----------------/
| PASID Entry |--- PASID cache flush -
'-------------' |
| | V
| | CR3 in GPA
'-------------'
Guest
------| Shadow |--------------------------|--------
v v v
Host
.-------------. .----------------------.
| pIOMMU | | Bind FL for GVA-GPA |
| | '----------------------'
.----------------/ |
| PASID Entry | V (Nested xlate)
'----------------\.------------------------------.
| | |SL for GPA-HPA, default domain|
| | '------------------------------'
'-------------'
Where:
- FL = First level/stage one page tables
- SL = Second level/stage two page tables

This work is based on collaboration with other developers on the IOMMU
mailing list. Notably,

[1] [PATCH v6 00/22] SMMUv3 Nested Stage Setup by Eric Auger
https://lkml.org/lkml/2019/3/17/124

[2] [RFC PATCH 2/6] drivers core: Add I/O ASID allocator by Jean-Philippe
Brucker
https://www.spinics.net/lists/iommu/msg30639.html

[3] [RFC PATCH 0/5] iommu: APIs for paravirtual PASID allocation by Lu Baolu
https://lkml.org/lkml/2018/11/12/1921

There are roughly three parts:
1. Generic PASID allocator [1] with extension to support custom allocator
2. IOMMU cache invalidation passdown from guest to host
3. Guest PASID bind for nested translation

All generic IOMMU APIs are reused from [1], which has a v7 just published with
no real impact to the patches used here. It is worth noting that unlike sMMU
nested stage setup, where PASID table is owned by the guest, VT-d PASID table is
owned by the host, individual PASIDs are bound instead of the PASID table.

Jacob Pan (15):
ioasid: Add custom IOASID allocator
ioasid: Convert ioasid_idr to XArray
driver core: add per device iommu param
iommu: introduce device fault data
iommu: introduce device fault report API
iommu: Introduce attach/detach_pasid_table API
iommu/vt-d: Add custom allocator for IOASID
iommu/vt-d: Replace Intel specific PASID allocator with IOASID
iommu: Add guest PASID bind function
iommu/vt-d: Move domain helper to header
iommu/vt-d: Add nested translation support
iommu/vt-d: Add bind guest PASID support
iommu: add max num of cache and granu types
iommu/vt-d: Support flushing more translation cache types
iommu/vt-d: Add svm/sva invalidate function

Jean-Philippe Brucker (1):
drivers core: Add I/O ASID allocator

Liu, Yi L (1):
iommu: Introduce cache_invalidate API

Lu Baolu (1):
iommu/vt-d: Enlightened PASID allocation

drivers/base/Kconfig | 7 ++
drivers/base/Makefile | 1 +
drivers/base/ioasid.c | 211 +++++++++++++++++++++++++++++++++++++
drivers/iommu/Kconfig | 1 +
drivers/iommu/dmar.c | 48 +++++++++
drivers/iommu/intel-iommu.c | 219 ++++++++++++++++++++++++++++++++++++--
drivers/iommu/intel-pasid.c | 191 +++++++++++++++++++++++++++++-----
drivers/iommu/intel-pasid.h | 24 ++++-
drivers/iommu/intel-svm.c | 217 +++++++++++++++++++++++++++++++++++---
drivers/iommu/iommu.c | 207 +++++++++++++++++++++++++++++++++++-
include/linux/device.h | 3 +
include/linux/intel-iommu.h | 40 +++++--
include/linux/intel-svm.h | 7 ++
include/linux/ioasid.h | 66 ++++++++++++
include/linux/iommu.h | 127 +++++++++++++++++++++++
include/uapi/linux/iommu.h | 248 ++++++++++++++++++++++++++++++++++++++++++++
16 files changed, 1559 insertions(+), 58 deletions(-)
create mode 100644 drivers/base/ioasid.c
create mode 100644 include/linux/ioasid.h
create mode 100644 include/uapi/linux/iommu.h

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2.7.4