[PATCH RFC v1 0/2] tests/qtest: Add Intel IOMMU bare-metal test using iommu-testdev

[Fengyuan Yu <15fengyuan@gmail.com>]

Hi,

This patch series adds a bare-metal qtest for the Intel IOMMU (VT-d) using
the iommu-testdev framework. The test exercises address translation paths
without requiring a full guest OS boot.

Motivation
----------

The Intel IOMMU implementation in QEMU supports various translation modes
including pass-through and translated (4-level paging) modes. Currently,
comprehensive testing of these translation paths requires booting a full
guest OS with appropriate drivers, which is time-consuming and makes
regression testing difficult.

This new test fills that gap by using iommu-testdev to trigger DMA
transactions and validate the IOMMU's translation logic directly.

Test Coverage
-------------

The new test provides:
- Legacy pass-through mode (identity mapping)
- Legacy translated mode with 4-level page table walks
- Root Entry Table and Context Entry Table configuration
- Complete 48-bit address space translation
- End-to-end DMA verification with memory validation

Testing
-------

QTEST_QEMU_BINARY=./build/qemu-system-x86_64 \
  ./build/tests/qtest/iommu-intel-test --tap -k

Thanks,
Fengyuan

Fengyuan Yu (2):
  tests/qtest/libqos: Add Intel IOMMU helper library
  tests/qtest: Add Intel IOMMU bare-metal test

 MAINTAINERS                          |   1 +
 tests/qtest/iommu-intel-test.c       | 137 +++++++
 tests/qtest/libqos/meson.build       |   3 +
 tests/qtest/libqos/qos-intel-iommu.c | 566 +++++++++++++++++++++++++++
 tests/qtest/libqos/qos-intel-iommu.h | 299 ++++++++++++++
 tests/qtest/meson.build              |   2 +
 6 files changed, 1008 insertions(+)
 create mode 100644 tests/qtest/iommu-intel-test.c
 create mode 100644 tests/qtest/libqos/qos-intel-iommu.c
 create mode 100644 tests/qtest/libqos/qos-intel-iommu.h

-- 
2.39.5