Migrating Windows 2016/2019 virtual machines with VBS enabled may cause it to BSOD when the MCEPSC mitigation is applied.
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Migrating Windows 2016/2019 virtual machines with VBS enabled may cause it to BSOD when the MCEPSC mitigation is applied.

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Article ID: 344881

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Updated On:

Products

VMware vSphere ESXi

Issue/Introduction



Environment

VMware ESXi 6.7.x

Cause

This is caused by a problem in the code that is called when dealing with large memory pages and simultaneously having the MCEPSC workaround enabled.

Resolution

This issue is resolved inVMware ESXi 6.7, Patch Release ESXi670-202206001.

Workaround:
To temporarily work around this issue, there are two options:

1. Disable large pages completely by disabling the Mem.AllocGuestLargePage advanced parameter on ESXi. This could cause a performance loss for the VMs.
See Advanced Memory Attributes - VMware Documentation for more information

2. Revert the steps that were taken to mitigate the MCEPSC vulnerability in Enabling Hypervisor-Specific Mitigations for Machine Check Error on Page Size Change (MCEPSC) Speculative-Execution vulnerability (CVE-2018-12207)