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openhcl_boot: remove VTL2 vmbus connection ID plumbing - #4690
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Ben Hillis (benhillis) merged 4 commits intoOct 20, 2026
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The OpenHCL kernel now determines the VTL2 vmbus message connection ID itself (microsoft/OHCL-Linux-Kernel#162), so the hv_vmbus.message_connection_id command line hack is no longer needed. Signed-off-by: Hardik Garg <hargar@linux.microsoft.com>
The OpenHCL kernel now picks the VTL2 vmbus message connection ID at runtime (microsoft/OHCL-Linux-Kernel#162) and nothing else consumes microsoft,message-connection-id, so stop parsing it from the host device tree and stop forwarding it to the VTL2 device tree. Signed-off-by: Hardik Garg <hargar@linux.microsoft.com>
Signed-off-by: Hardik Garg <hargar@linux.microsoft.com>
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This PR modifies files containing For more on why we check whole files, instead of just diffs, check out the Rustonomicon |
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🟡 Changes recommended
Nix still selects the older kernel, breaking VMBus initialization on hosts requiring the redirect connection ID.
1 open issue
What changed in this PR
Moves OpenHCL boot to kernel-managed VTL2 VMBus connection-ID selection.
Changes:
- Updates the default kernel to
6.18.37.6. - Removes connection-ID command-line, device-tree, and host-parameter plumbing.
- Adjusts parser tests for the smaller device tree.
| File | Description |
|---|---|
| openhcl/openhcl_boot/src/main.rs | Removes the kernel command-line override. |
| openhcl/openhcl_boot/src/host_params/mod.rs | Removes connection-ID initialization. |
| openhcl/openhcl_boot/src/host_params/dt/mod.rs | Preserves node validation without copying IDs. |
| openhcl/openhcl_boot/src/dt.rs | Stops emitting connection-ID properties. |
| openhcl/host_fdt_parser/src/lib.rs | Removes ID parsing and updates tests. |
| flowey/flowey_lib_hvlite/src/_jobs/cfg_versions.rs | Updates the default kernel version. |
Review effort: Balanced
Keep the Nix kernel packages in sync with the Flowey release version and update the hashes for the x64, arm64, and CVM x64 artifacts. Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com> Signed-off-by: Hardik Garg <hargar@linux.microsoft.com>
Hardik Garg (hargar19)
marked this pull request as ready for review
October 19, 2026 18:32
Ben Hillis (benhillis)
approved these changes
Oct 19, 2026
Chris Oo (chris-oo)
approved these changes
Oct 19, 2026
Ben Hillis (benhillis)
merged commit Oct 20, 2026
7f8513a
into
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146 of 148 checks passed
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Update the OpenHCL kernel revision to use the upstream device connection ID support: kernel PR: microsoft/OHCL-Linux-Kernel#162
The kernel now selects the VTL2 vmbus message connection ID at runtime, so this change:
hv_vmbus.message_connection_idon the kernel command line.microsoft,message-connection-idfrom the host device tree.Signed-off-by: Hardik Garg <hargar@linux.microsoft.com>