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vmm: Support device passthrough with vfio cdev and iommufd

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When `--platform iommufd=on` is set, use the vfio cdev interface backed
by iommufd instead of the legacy vfio container/group interface for
device passthrough.

The cdev path opens '/dev/iommu' via IommuFd, allocates an IOAS, and
binds VFIO devices through VfioIommufd. The legacy container/group path
remains the default and is used when iommufd is not enabled.

Add iommufd-ioctls as a workspace dependency and enable the "vfio_cdev"
feature on vfio-ioctls for KVM builds.

Fixes: #6892

Signed-off-by: Bo Chen <bchen@crusoe.ai>
This commit is contained in:
Bo Chen
2026-04-09 04:50:54 +00:00
parent 13972a0edf
commit fe5f991c37
4 changed files with 62 additions and 3 deletions
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1
Cargo.toml
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@@ -53,6 +53,7 @@ resolver = "3"
[workspace.dependencies]
# rust-vmm crates
acpi_tables = "0.2.0"
iommufd-ioctls = "0.1.0"
kvm-bindings = "0.14.0"
kvm-ioctls = "0.24.0"
linux-loader = "0.13.2"