[RFC PATCH 0/6] iommu/amd: Introduce hardware info reporting and nested translation support

Suravee Suthikulpanit
2023-12-12T16:02:12Z

OVERVIEW
--------
This is the first part of multi-part series to introduce the AMD IOMMU
nested translation support with Hardware-virtualized IOMMU (HW-vIOMMU),
which allows user-space to take adventage of hardware accelerated
AMD IOMMU in the guest.

The part 1 introduces AMD IOMMU hardware info reporting support via
the ioctl IOMMU_GET_HW_INFO with enum IOMMU_HW_INFO_TYPE_AMD. This allows
hypervisor to communicate the supported capabilities to user-space.
For example, this information can be used by QEMU to populate EFR and EFR2
field in the guest IVRS table when building guest ACPI table.

In addition, this series introduces nested translation support for the
AMD IOMMU v2 page table (stage-1) via the IOMMUFD nesting infrastructure.
This allows User-space to set up the v2 page table and communicate
information via the struct iommu_hwpt_amd_v2 with enum
IOMMU_HWPT_DATA_AMD_V2.

This series is based on top of:
* Linux v6.7-rc5
* Series [PATCH v2 0/9] Improve TLB invalidation logic
(Currently queued in https://git.kernel.org/pub/scm/linux/kernel/git/joro/iommu.git/log/?h=next)
* Series [PATCH v4 00/16] iommu/amd: SVA Support (part 3) - refactor support for GCR3 table
(https://lore.kernel.org/all/20231212085224.6985-1-vasant.hegde@amd.com/)

GITHUB
------
[1] https://github.com/AMDESE/linux/tree/iommu_sva_part3_v4_v6.7_rc5-amd_nesting_rfc_v1
(Complete code for the part 1 of this series)
[2] https://github.com/AMDESE/linux/tree/wip/iommu_sva_part3_v4_v6.7_rc5-amd_viommu_20231212
(WIP for Linux AMD Hw-vIOMMU support)

HISTORY
-------
* [RFC PATCH 00/21] iommu/amd: Introduce support for HW accelerated vIOMMU w/ nested page table
(https://lore.kernel.org/lkml/20230621235508.113949-1-suravee.suthikulpanit@amd.com/)

Thank you,
Suravee

Suravee Suthikulpanit (6):
iommu/amd: Update PASID, GATS, and GLX feature related macros
iommu/amd: Add support for hw_info for iommu capability query
iommu/amd: Introduce Guest-ID struct amd_iommu_vminfo
iommufd: Introduce data struct for AMD nested domain allocation
iommu/amd: Introduce helper functions to setup GCR3TRPMode
iommu/amd: Introduce nested translation support

drivers/iommu/amd/Makefile | 2 +-
drivers/iommu/amd/amd_iommu.h | 20 +-
drivers/iommu/amd/amd_iommu_types.h | 26 ++-
drivers/iommu/amd/init.c | 8 +-
drivers/iommu/amd/iommu.c | 299 +++++++++++++++++++++++++++-
drivers/iommu/amd/nested.c | 107 ++++++++++
include/uapi/linux/iommufd.h | 36 ++++
7 files changed, 475 insertions(+), 23 deletions(-)
create mode 100644 drivers/iommu/amd/nested.c

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2.34.1