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https://issues.apache.org/jira/browse/CLOUDSTACK-9379?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15530917#comment-15530917
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ASF GitHub Bot commented on CLOUDSTACK-9379:
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Github user jburwell commented on the issue:
https://github.com/apache/cloudstack/pull/1542
@rhtyd good idea to check the CPU flags. There is a part of me that would
like to see a VM actually spin up inside a VM, but there are also many things
that could go wrong that are not related to CloudStack. Plus, it would be
slow. Therefore, checking the CPU flags is an excellent compromise.
Another thing that I see in this PR is that nested virtualization seems
like a capability that should be more generally expressed and managed in
CloudStack's core abstractions. @rhtyd could you open a ticket to extract the
aspects of this enhancement that are common across all hypervisors that support
nested virtualization?
> Support nested virtualization at VM level on VMware Hypervisor
> --------------------------------------------------------------
>
> Key: CLOUDSTACK-9379
> URL: https://issues.apache.org/jira/browse/CLOUDSTACK-9379
> Project: CloudStack
> Issue Type: Improvement
> Security Level: Public(Anyone can view this level - this is the
> default.)
> Components: VMware
> Affects Versions: 4.9.0
> Reporter: Nicolas Vazquez
> Assignee: Nicolas Vazquez
> Fix For: 4.10.0.0
>
>
> h2. Introduction
> It is desired to support nested virtualization at VM level for VMware
> hypervisor. Current behaviour supports enabling/desabling global nested
> virtualization by modifying global config {{'vmware.nested.virtualization'}}.
> It is wished to improve this feature, having control at VM level instead of a
> global control only.
> h2. Proposal
> A new global configuration is added, to enable/disable VM nested
> virtualization control: {{'vmware.nested.virtualization.perVM'}}. Default
> value=false
> h2. Behaviour
> After a vm deployment or start command, vm params include
> {{nestedVirtualizationFlag}} key and its value is:
> * true -> nested virtualization enabled
> * false -> nested virtualization disabled
> We will determinate nested virtualization enabled/disabled by examining:
> * (1) global configuration {{'vmware.nested.virtualization'}} value
> * (2) global configuration {{'vmware.nested.virtualization.perVM'}} value
> * (3) {{'nestedVirtualizationFlag'}} value in {{user_vm_details}} if present,
> null if not.
> Using this 3 values, there are different use cases:
> # (1) = TRUE, (2) = TRUE, (3) is null -> ENABLED
> # (1) = TRUE, (2) = TRUE, (3) = TRUE -> ENABLED
> # (1) = TRUE, (2) = TRUE, (3) = FALSE -> DISABLED
> # (1) = TRUE, (2) = FALSE -> ENABLED
> # (1) = FALSE, (2) = TRUE, (3) is null -> DISABLED
> # (1) = FALSE, (2) = TRUE, (3) = TRUE -> ENABLED
> # (1) = FALSE, (2) = TRUE, (3) = FALSE -> DISABLED
> # (1) = FALSE, (2) = FALSE -> DISABLED
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