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Quick Tip - Virtualized Intel VT-x/EPT or AMD-V/RVI is not supported on this platform for VMware Workstation

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In both Microsoft Windows 10 and 11, Virtualization Based Security (VBS) is enabled by default and this capability uses Hyper-V under the hood, which is a form of Nested Virtualization. If you are using VMware Workstation and you attempt to power on a Nested ESXi VM, you probably will see one of the following error messages based on the CPU vendor:

  • Virtualized Intel VT-x/EPT is not supported on this platform 
  • Virtualized AMD-V/RVI is not supported on this platform 

While VMware Workstation has been enhanced to co-exists with Hyper-V through a new Host VBS Mode introduced in VMware Workstation 17.x:

Workstation Pro uses a set of newly introduced Windows 10 features (Windows Hypervisor Platform) that permits the use of VT/AMD-V features, which enables Workstation Pro and Hyper-V to coexist. And because VBS is built on Hyper-V, Windows hosts with VBS enabled can now power on VM in Workstation Pro successfully

This are few limitations as mentioned in the VMware Workstation documentation.

With that said, if you do need to run Nested ESXi under VMware Workstation, you just need to disable Windows VBS, assuming you have administrative privileges on your system.

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Quick Tip - Updating Intel ixgben driver enables Multi-gigabit (2.5gbE / 5GbE) selection in ESXi

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Here is a nice protip from one of my readers, Peter, who recently came across an issue with an Intel x550 network adaptor and ESXi not listing any of the Multi-gigabit (2.5GbE or 5GbE) options even though his underlying physical network was setup as 2.5GbE, only 100MBps, 1GbE and 10GbE was available.

After a bit of trial/error, he discovered the solution was to update the inbox version of the Intel ixgben driver (1.7.1.44-1vmw.803.0.0.24022510) to the latest supported version for ESXi 8.x and he immediately saw the additional Multi-gigabit speeds as shown in his screenshot below:

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Experimenting with ESXi CPU affinity and Intel Hybrid CPU Cores

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After debugging a recent issue with using VMware Workstation and Intel Hybrid CPUs, it gave me an idea about an experiment to try with ESXi and Intel Hybrid CPUs.

As a refresher, starting with the Intel 12th Generation (Alder Lake) CPU, a new hybrid big.LITTLE CPU architecture was introduced for consumer Intel CPUs. This new hybrid Intel CPU architecture integrates two types of CPU cores: Performance-cores (P-cores) and Efficiency-cores (E-cores) into the same physical CPU die. For more information about this new hybrid Intel CPU design, check out this resource HERE. The ESXi scheduler does not and has no current plans to support this new Intel Hybrid CPU architecture, especially as this type of architecture is nowhere to be found in traditional Enterprise datacenters and is only limited to Intel Consumer CPUs.

The current recommendation to work around the non-uniformity of the CPU cores is to either disable the E or P-cores within the system BIOS, thus making the system "uniform" and allowing ESXi to run like a normal x86 system. While you can apply a workaround to have ESXi ignore the non-uniformity of the CPU cores, in addition to the non-deterministic behaviors, random PSOD can also occur due to scheduling across two different types of cores.

I was curious to see whether applying ESXi CPU affinity on a VM using Intel Hybrid CPU Cores might yield a different outcome?

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