Merge tag 'vfio-v6.18-rc1' of https://github.com/awilliam/linux-vfio

Pull VFIO updates from Alex Williamson:

- Use fdinfo to expose the sysfs path of a device represented by a vfio
device file

Merge tag 'vfio-v6.18-rc1' of https://github.com/awilliam/linux-vfio

Pull VFIO updates from Alex Williamson:

- Use fdinfo to expose the sysfs path of a device represented by a vfio
device file (Alex Mastro)

- Mark vfio-fsl-mc, vfio-amba, and the reset functions for
vfio-platform for removal as these are either orphaned or believed to
be unused (Alex Williamson)

- Add reviewers for vfio-platform to save it from also being marked for
removal (Mostafa Saleh, Pranjal Shrivastava)

- VFIO selftests, including basic sanity testing and minimal userspace
drivers for testing against real hardware. This is also expected to
provide integration with KVM selftests for KVM-VFIO interfaces (David
Matlack, Josh Hilke)

- Fix drivers/cdx and vfio/cdx to build without CONFIG_GENERIC_MSI_IRQ
(Nipun Gupta)

- Fix reference leak in hisi_acc (Miaoqian Lin)

- Use consistent return for unsupported device feature (Alex Mastro)

- Unwind using the correct memory free callback in vfio/pds (Zilin
Guan)

- Use IRQ_DISABLE_LAZY flag to improve handling of pre-PCI2.3 INTx and
resolve stalled interrupt on ppc64 (Timothy Pearson)

- Enable GB300 in nvgrace-gpu vfio-pci variant driver (Tushar Dave)

- Misc:
- Drop unnecessary ternary conversion in vfio/pci (Xichao Zhao)
- Grammatical fix in nvgrace-gpu (Morduan Zang)
- Update Shameer's email address (Shameer Kolothum)
- Fix document build warning (Alex Williamson)

* tag 'vfio-v6.18-rc1' of https://github.com/awilliam/linux-vfio: (48 commits)
vfio/nvgrace-gpu: Add GB300 SKU to the devid table
vfio/pci: Fix INTx handling on legacy non-PCI 2.3 devices
vfio/pds: replace bitmap_free with vfree
vfio: return -ENOTTY for unsupported device feature
hisi_acc_vfio_pci: Fix reference leak in hisi_acc_vfio_debug_init
vfio/platform: Mark reset drivers for removal
vfio/amba: Mark for removal
MAINTAINERS: Add myself as VFIO-platform reviewer
MAINTAINERS: Add myself as VFIO-platform reviewer
docs: proc.rst: Fix VFIO Device title formatting
vfio: selftests: Fix .gitignore for already tracked files
vfio/cdx: update driver to build without CONFIG_GENERIC_MSI_IRQ
cdx: don't select CONFIG_GENERIC_MSI_IRQ
MAINTAINERS: Update Shameer Kolothum's email address
vfio: selftests: Add a script to help with running VFIO selftests
vfio: selftests: Make iommufd the default iommu_mode
vfio: selftests: Add iommufd mode
vfio: selftests: Add iommufd_compat_type1{,v2} modes
vfio: selftests: Add vfio_type1v2_mode
vfio: selftests: Replicate tests across all iommu_modes
...

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vfio: selftests: Add driver for Intel DSA

Add a driver to VFIO selftests for Intel DSA devices.

For now the driver only supports up to 32 batches and 1024 copies per
batch, which were the limits of

vfio: selftests: Add driver for Intel DSA

Add a driver to VFIO selftests for Intel DSA devices.

For now the driver only supports up to 32 batches and 1024 copies per
batch, which were the limits of the hardware this commit was tested
with. This is sufficient to generate 9+ minutes of DMA memcpys at a rate
of over 30 GB/s. This should be plenty to stress test VFIO and the IOMMU.

The driver does not yet support requesting interrupt handles, as this
commit was not tested against hardware that requires it.

Cc: Vinicius Costa Gomes <vinicius.gomes@intel.com>
Cc: Dave Jiang <dave.jiang@intel.com>
Acked-by: Vinicius Costa Gomes <vinicius.gomes@intel.com>
Acked-by: Shuah Khan <skhan@linuxfoundation.org>
Signed-off-by: David Matlack <dmatlack@google.com>
Link: https://lore.kernel.org/r/20250822212518.4156428-23-dmatlack@google.com
Signed-off-by: Alex Williamson <alex.williamson@redhat.com>

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vfio: selftests: Add driver for Intel CBDMA

Add a driver for the Intel CBDMA device. This driver is based on and
named after the Linux driver for this device (drivers/dma/ioat/) and
also based on pr

vfio: selftests: Add driver for Intel CBDMA

Add a driver for the Intel CBDMA device. This driver is based on and
named after the Linux driver for this device (drivers/dma/ioat/) and
also based on previous work from Peter Shier <pshier@google.com>.

The driver aims to be as simple as possible. It uses a single descriptor
to issue DMA operations, and only supports the copy operation. For "DMA
storms", the driver kicks off the maximum number of maximum-sized DMA
operations. On Skylake server parts, this was 2^16-1 copies of size 2M
and lasts about 15 seconds.

Create symlinks to drivers/dma/ioat/{hw.h,registers.h} to get access to
various macros (e.g. IOAT_CHANCMD_RESET) and struct ioat_dma_descriptor.

Cc: Dave Jiang <dave.jiang@intel.com>
Cc: Dan Williams <dan.j.williams@intel.com>
Acked-by: Dave Jiang <dave.jiang@intel.com>
Acked-by: Shuah Khan <skhan@linuxfoundation.org>
Signed-off-by: David Matlack <dmatlack@google.com>
Link: https://lore.kernel.org/r/20250822212518.4156428-20-dmatlack@google.com
Signed-off-by: Alex Williamson <alex.williamson@redhat.com>

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vfio: selftests: Add driver framework

Add a driver framework to VFIO selftests, so that devices can generate
DMA and interrupts in a common way that can be then utilized by tests.
This will enable V

vfio: selftests: Add driver framework

Add a driver framework to VFIO selftests, so that devices can generate
DMA and interrupts in a common way that can be then utilized by tests.
This will enable VFIO selftests to exercise real hardware DMA and
interrupt paths, without needing any device-specific code in the test
itself.

Subsequent commits will introduce drivers for specific devices.

Acked-by: Shuah Khan <skhan@linuxfoundation.org>
Signed-off-by: David Matlack <dmatlack@google.com>
Link: https://lore.kernel.org/r/20250822212518.4156428-13-dmatlack@google.com
Signed-off-by: Alex Williamson <alex.williamson@redhat.com>

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