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Add NestedVirtualizationEnabled launch-template parameter #1769

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26d1038
Add NestedVirtualizationEnabled launch-template parameter
iangmaia Apr 24, 2026
be7825d
Merge branch 'main' into iangmaia/add-nested-virtualization-param
iangmaia May 18, 2026
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5 changes: 5 additions & 0 deletions CHANGELOG.md
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Expand Up @@ -4,6 +4,11 @@ All notable changes to this project will be documented in this file.

The format is based on [Keep a Changelog](http://keepachangelog.com/en/1.0.0/)

## Unreleased

### Added
* Public API: add `NestedVirtualizationEnabled` stack parameter for `c8i`, `m8i`, `r8i`, and their flex variants

## [v6.65.0](https://github.com/buildkite/elastic-ci-stack-for-aws/compare/v6.64.0...v6.65.0) (2026-05-08)

### Changed
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20 changes: 20 additions & 0 deletions templates/aws-stack.yml
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Expand Up @@ -88,6 +88,7 @@ Metadata:
- InstanceOperatingSystem
- InstanceTypes
- CpuCredits
- NestedVirtualizationEnabled
- EnableInstanceStorage
- MountTmpfsAtTmp
- AgentsPerInstance
Expand Down Expand Up @@ -657,6 +658,18 @@ Parameters:
- unlimited
Default: "unlimited"

NestedVirtualizationEnabled:
Description: >
Enable nested virtualization on supported EC2 instance types. Sets
CpuOptions.NestedVirtualization=enabled on the agent launch template.
Supported on c8i, m8i, r8i, and their flex variants. If enabled, all
values in InstanceTypes must be from supported families or launches fail.
Type: String
AllowedValues:
- "true"
- "false"
Default: "false"

MaxSize:
Description: Maximum number of instances. Controls cost ceiling and prevents runaway scaling.
Type: Number
Expand Down Expand Up @@ -1532,6 +1545,9 @@ Conditions:
- !Equals [ !Select [ 0, !Split [ ".", !Ref InstanceTypes ] ], "t3a" ]
- !Equals [ !Select [ 0, !Split [ ".", !Ref InstanceTypes ] ], "t4g" ]

UseNestedVirtualization:
!Equals [ !Ref NestedVirtualizationEnabled, "true" ]

UseStackNameForInstanceName:
!Equals [ !Ref InstanceName, "" ]

Expand Down Expand Up @@ -2254,6 +2270,10 @@ Resources:
- UsingBurstableInstances
- CpuCredits: !Ref CpuCredits
- !Ref "AWS::NoValue"
CpuOptions: !If
- UseNestedVirtualization
- NestedVirtualization: enabled
- !Ref "AWS::NoValue"
TagSpecifications:
- ResourceType: instance
Tags:
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