This series belongs to a list of series that add SVM support for VT-d.
As a starting point, we use the series called 'intel_iommu: Enable stage-1
translation for passthrough device' by Zhenzhong Duan and Yi Liu.
Here we focus on the implementation of ATS support in the IOMMU and on a
PCI-level
API for ATS to be used by virtual devices.
This work is based on the VT-d specification version 4.1 (March 2023).
Here is a link to a GitHub repository where you can find the following elements
:
- Qemu with all the patches for SVM
- ATS
- PRI
- Device IOTLB invalidations
- Requests with already translated addresses
- A demo device
- A simple driver for the demo device
- A userspace program (for testing and demonstration purposes)
https://github.com/BullSequana/Qemu-in-guest-SVM-demo
v2
- handle huge pages better by detecting the page table level at which the
translation errors occur
- Changes after review by ZhenZhong Duan :
- Set the access bit after checking permissions
- helper for PASID and ATS : make the commit message more accurate
('present' replaced with 'enabled')
- pcie_pasid_init: add PCI_PASID_CAP_WIDTH_SHIFT and use it instead of
PCI_EXT_CAP_PASID_SIZEOF for shifting the pasid width when preparing the
capability register
- pci: do not check pci_bus_bypass_iommu after calling
pci_device_get_iommu_bus_devfn
- do not alter formatting of IOMMUTLBEntry declaration
- vtd_iova_fl_check_canonical : directly use s->aw_bits instead of aw
for the sake of clarity
v3
- rebase on new version of Zhenzhong's flts implementation (now contains
some patches from v2)
- fix the atc lookup operation (check the mask before returning an entry)
- add a unit test for the ATC
- store a user pointer in the iommu notifiers to simplify the
implementation of svm devices
Changes after review by Zhenzhong :
- store the input pasid instead of rid2pasid when returning an entry
after a translation
- split the ATC implementation and its unit tests
Clément Mathieu--Drif (22):
intel_iommu: fix FRCD construction macro.
intel_iommu: make types match
intel_iommu: return page walk level even when the translation fails
intel_iommu: do not consider wait_desc as an invalid descriptor
memory: add permissions in IOMMUAccessFlags
pcie: add helper to declare PASID capability for a pcie device
pcie: helper functions to check if PASID and ATS are enabled
intel_iommu: declare supported PASID size
pci: cache the bus mastering status in the device
pci: add IOMMU operations to get address spaces and memory regions
with PASID
memory: store user data pointer in the IOMMU notifiers
pci: add a pci-level initialization function for iommu notifiers
intel_iommu: implement the get_address_space_pasid iommu operation
intel_iommu: implement the get_memory_region_pasid iommu operation
memory: Allow to store the PASID in IOMMUTLBEntry
intel_iommu: fill the PASID field when creating an instance of
IOMMUTLBEntry
atc: generic ATC that can be used by PCIe devices that support SVM
atc: add unit tests
memory: add an API for ATS support
pci: add a pci-level API for ATS
intel_iommu: set the address mask even when a translation fails
intel_iommu: add support for ATS
hw/i386/intel_iommu.c | 142 +++++-
hw/i386/intel_iommu_internal.h | 6 +-
hw/pci/pci.c | 127 +++++-
hw/pci/pcie.c | 42 ++
include/exec/memory.h | 51 ++-
include/hw/i386/intel_iommu.h | 2 +-
include/hw/pci/pci.h | 101 +++++
include/hw/pci/pci_device.h | 1 +
include/hw/pci/pcie.h | 9 +-
include/hw/pci/pcie_regs.h | 3 +
include/standard-headers/linux/pci_regs.h | 1 +
system/memory.c | 20 +
tests/unit/meson.build | 1 +
tests/unit/test-atc.c | 527 ++++++++++++++++++++++
util/atc.c | 211 +++++++++
util/atc.h | 117 +++++
util/meson.build | 1 +
17 files changed, 1330 insertions(+), 32 deletions(-)
create mode 100644 tests/unit/test-atc.c
create mode 100644 util/atc.c
create mode 100644 util/atc.h
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2.44.0
