| From: |
| Yi Liu <yi.l.liu-AT-intel.com> |
| To: |
| joro-AT-8bytes.org, alex.williamson-AT-redhat.com, jgg-AT-nvidia.com, kevin.tian-AT-intel.com, robin.murphy-AT-arm.com, baolu.lu-AT-linux.intel.com |
| Subject: |
| [RFC 0/8] iommufd support pasid attach/replace |
| Date: |
| Tue, 26 Sep 2023 02:26:43 -0700 |
| Message-ID: |
| <20230926092651.17041-1-yi.l.liu@intel.com> |
| Cc: |
| cohuck-AT-redhat.com, eric.auger-AT-redhat.com, nicolinc-AT-nvidia.com, kvm-AT-vger.kernel.org, mjrosato-AT-linux.ibm.com, chao.p.peng-AT-linux.intel.com, yi.l.liu-AT-intel.com, yi.y.sun-AT-linux.intel.com, peterx-AT-redhat.com, jasowang-AT-redhat.com, shameerali.kolothum.thodi-AT-huawei.com, lulu-AT-redhat.com, suravee.suthikulpanit-AT-amd.com, iommu-AT-lists.linux.dev, linux-kernel-AT-vger.kernel.org, linux-kselftest-AT-vger.kernel.org, zhenzhong.duan-AT-intel.com, joao.m.martins-AT-oracle.com |
| Archive-link: |
| Article |
PASID (Process Address Space ID) is a PCIe extension to tag the DMA
transactions out of a physical device, and most modern IOMMU hardware
have supported PASID granular address translation. So a PASID-capable
devices can be attached to multiple hwpts (a.k.a. domains), each attachment
is tagged with a PASID.
This series first adds a missing iommu API to replace domain for a pasid,
then adds iommufd APIs for device drivers to attach/replace/detach pasid
to/from hwpt per userspace's request, and adds selftest to validate the
iommufd APIs.
pasid attach/replace is mandatory on Intel VT-d given the PASID table
locates in the physical address space hence must be managed by the kernel,
both for supporting vSVA and coming SIOV. But it's optional on ARM/AMD
which allow configuring the PASID/CD table either in host physical address space
or nested on top of an GPA address space. This series only add VT-d support
as the minimal requirement.
Complete code can be found in below link:
https://github.com/yiliu1765/iommufd/tree/iommufd_pasid
Regards,
Yi Liu
Kevin Tian (1):
iommufd: Support attach/replace hwpt per pasid
Lu Baolu (2):
iommu: Introduce a replace API for device pasid
iommu/vt-d: Add set_dev_pasid callback for nested domain
Yi Liu (5):
iommufd: replace attach_fn with a structure
iommufd/selftest: Add set_dev_pasid and remove_dev_pasid in mock iommu
iommufd/selftest: Add a helper to get test device
iommufd/selftest: Add test ops to test pasid attach/detach
iommufd/selftest: Add coverage for iommufd pasid attach/detach
drivers/iommu/intel/nested.c | 47 +++++
drivers/iommu/iommu-priv.h | 2 +
drivers/iommu/iommu.c | 73 ++++++--
drivers/iommu/iommufd/Makefile | 1 +
drivers/iommu/iommufd/device.c | 42 +++--
drivers/iommu/iommufd/iommufd_private.h | 16 ++
drivers/iommu/iommufd/iommufd_test.h | 24 +++
drivers/iommu/iommufd/pasid.c | 152 ++++++++++++++++
drivers/iommu/iommufd/selftest.c | 158 ++++++++++++++--
include/linux/iommufd.h | 6 +
tools/testing/selftests/iommu/iommufd.c | 172 ++++++++++++++++++
.../selftests/iommu/iommufd_fail_nth.c | 28 ++-
tools/testing/selftests/iommu/iommufd_utils.h | 78 ++++++++
13 files changed, 756 insertions(+), 43 deletions(-)
create mode 100644 drivers/iommu/iommufd/pasid.c
--
2.34.1
