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vSphere 8.0 Update 1c resolves Windows VBS performance & Hyper-V Generation 2 Nested VM running on AMD CPU

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vSphere 8.0 Update 1c was just released and one of the resolved issues mentioned in the ESXi release notes is the following:

Nested virtual machines on AMD CPUs with operational systems such as Windows with virtualization-based security (VBS) might experience performance degradation, timeouts, or unresponsiveness due to an issue with the virtualization of AMD's Rapid Virtualization Indexing (RVI), also known as Nested Page Tables (NPT).

UPDATE (10/11/23) - This is also resolved in the ESXi 7.0 Update 3o release

There are two scenarios in which this fix resolves:

  1. Running Windows Server VM with a Hyper-V enabled Generation 2 VM (Nested Virtualization) on AMD CPU
  2. Running Windows Server VM with VBS Enabled (Non-Nested VM) on AMD CPU

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Creating a custom VIB for ESXi 8.x

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Back in 2012, a VMware Fling was released called VIB Author, which allowed users to create their own custom vSphere Infrastructure Bundles (VIB) that typically would include configuration changes that was not possible when using the vSphere API such as enabling custom ESXi firewall ports or even bundling up custom utilities that could run within the ESXi Shell.

The VIB Author tool was eventually deprecated and removed due to the lack of support from Engineering, after all, it was released as a Fling. While the need for opening non-standard ESXi firewall port has greatly improved over the years, with the majority of 2nd and 3rd party solutions simply incorporating that into their solution offering, there are still use cases for requiring a custom VIB.

Even with the VIB Author Fling being deprecated, many in the community was still able to construct custom VIBs which were still compatible with later ESXi 5.x to 7.x releases. In fact, I even use the VIB Author to make it easier to distribute and install the popular ghettoVCB solution which can be installed using either a VIB or an Offline Bundle, another format the VIB Author tool supports creating.

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Building custom Tanzu Kubernetes Releases (TKR) for vSphere with Tanzu

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Right before going on PTO, I caught this really interesting tweet from my buddy Robert Guske that we now support building your own custom Tanzu Kubernetes Releases (TKR), the Kubernetes software distributions that is signed and supported by VMware, which is typically provided by VMware through the online TKR Content Library.

While there are already a number of existing customizations that can be applied when deploying a Tanzu Kubernetes Workload Cluster (TKC), there may still be certain VM configurations that you would like to add, which is simply not possible today. In some of the customer requests, it can be as simple as changing the default size of the primary disk for a TKR, which is statically configured today as 20GB.

With this and many other use cases, it is nice to see that we now finally provide customers with a supported method to build their own custom TKR that might include additional customizations that is required by their organization for use with vSphere with Tanzu.

I recently got a chance to play with the new vSphere Tanzu Kubernetes Grid Image Builder tool, which is also an open source project from VMware and leverages the existing Kubernetes Image Builder, which I have also used before (see this blog post HERE for more details). While getting started, it took me a few tries but I eventually got it working after speaking with the Developers as I ran into a few issues.

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