[PATCH 0/2] IOMMU fixes
Vadim found that it was not possible to test networking in the live image's make run target. This turned out to be for two separate reasons. One was that we didn't have an IOMMU on that QEMU machine, but even adding that wasn't enough, because Intel IOMMUs also just didn't work at all on the live image, due to a missing kernel command line parameter. Alyssa Ross (2): Set intel_iommu=on in kernel command line Add IOMMU to other host test targets host/initramfs/Makefile | 4 +++- img/combined/run-vm.nix | 3 ++- img/live/Makefile | 4 +++- 3 files changed, 8 insertions(+), 3 deletions(-) base-commit: 3aa2f8aa7423cdf36c797943ad7d5a9756290909 -- 2.37.1
In Nixpkgs kernels, Intel IOMMUs are disabled by
default (CONFIG_INTEL_IOMMU_DEFAULT_ON=n), so it needs to be
explicitly enabled on the kernel command line. This was already done
in the rootfs run make target, which is what I mostly use for testing,
which is why I hadn't noticed until now.
We could also set CONFIG_INTEL_IOMMU_DEFAULT_ON, but I think it's
better to avoid changing our kernel configuration too much at the
moment. (This might change in future if we want to go all in.)
No changes are required for AMD IOMMUs, which are enabled by default.
Reported-by: Vadim Likholetov
This patch has been committed as 7a4389a94ecffadf9ece46423c1824280114d5a8,
which can be viewed online at
https://spectrum-os.org/git/spectrum/commit/?id=7a4389a94ecffadf9ece46423c18....
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Alyssa Ross
This will make it possible to test passthrough in all test targets
where it makes sense, rather than just host/rootfs.
I think we should consider in future having a single wrapper script
that runs QEMU with all the flags necessary to support Spectrum's
hardware requirements, because this is only going to get more
difficult to maintain once we need to support multiple CPU
architectures.
Reported-by: Vadim Likholetov
This patch has been committed as 435a82a9d09e6aaca27402a45756de1abd37437f,
which can be viewed online at
https://spectrum-os.org/git/spectrum/commit/?id=435a82a9d09e6aaca27402a45756....
This is an automated message. Send comments/questions/requests to:
Alyssa Ross
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Alyssa Ross