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vm: note on skip forced disk controllers uefi secure boot #616

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from shapeblue:note-kvm-uefiwinskipcont

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@shwstppr shwstppr commented Jan 7, 2026
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Related apache/cloudstack#11750
Signed-off-by: Abhishek Kumar <abhishek.mrt22@gmail.com>
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shwstppr commented Jan 7, 2026

@blueorangutan docbuild

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@shwstppr a Jenkins job has been kicked to build the document. I'll keep you posted as I make progress.

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QA-Doc build preview: https://qa.cloudstack.cloud/builds/docs-build/pr/616. (QA-JID 478)


**KVM**

Instances running on the KVM hypervisor with UEFI Secure Boot have disk controllers automatically enforced:
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@sureshanaparti sureshanaparti Jan 8, 2026

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Suggested change
Instances running on the KVM hypervisor with UEFI Secure Boot have disk controllers automatically enforced:
Instances running on the KVM hypervisor with UEFI Secure Boot have the following disk controllers automatically enforced:

- Windows OS instances use SATA
- Non-Windows OS instances use VirtIO

Starting with 4.20.3 and later, this behavior can be overridden by setting the following template or instance detail:
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@sureshanaparti sureshanaparti Jan 8, 2026

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Starting with 4.20.3 and later, this behavior can be overridden by setting the following template or instance detail:
Starting with 4.20.3 and later, this behavior can be overridden by setting the following template or instance detail to true:


``skip.force.disk.controller = true``

When set, disk controller enforcement is skipped and the controllers defined by template/instance details are used.
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@sureshanaparti sureshanaparti Jan 8, 2026

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When set, disk controller enforcement is skipped and the controllers defined by template/instance details are used.
When set to true, the disk controller enforcement is skipped and the controllers defined by template/instance details are used.

need to mention which detail takes priority?

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@RosiKyu RosiKyu Jan 9, 2026

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@sureshanaparti ,@shwstppr - based on the test results so far, instance-level detail takes priority over template-level (standard CloudStack behavior). We can add: 'If set on both template and instance, the instance setting takes precedence.'"


``skip.force.disk.controller = true``

When set, disk controller enforcement is skipped and the controllers defined by template/instance details are used.
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@RosiKyu RosiKyu Jan 9, 2026

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@sureshanaparti ,@shwstppr - based on the test results so far, instance-level detail takes priority over template-level (standard CloudStack behavior). We can add: 'If set on both template and instance, the instance setting takes precedence.'"

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@sureshanaparti sureshanaparti sureshanaparti left review comments

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@RosiKyu RosiKyu RosiKyu requested changes

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