Applicable to:
- SolusVM 2
Symptoms
- After recent Windows server 2025 cumulative update KB5060842 VPSs don't start with BSOD:
SVM_ERROR: UNSUPPORTED PROCESSOR - An AMD processor is used on CR.
Cause
Bug in Windows update KB5060842.
The error specifically targets systems configured with CPU type set to “host,” which passes through the actual AMD processor features to the virtual machine.
In SolusVM2 CPU type 'host' is the default configuration.
Resolution
Until Microsoft fixes the issue, apply one of workarounds that suit you more:
- Go to Settings > Compute Resources.
In the KVM Settings > Libvirt XML configuration specify:
CONFIG_TEXT: <cpu mode='custom' match='exact' check='none'>
<model fallback='allow'>EPYC-Rome</model>
</cpu>- Settings will be applied automatically for the new virtual machines, for the old virtual machines you may want to trigger the configuration edit, e.g. change the Disk cache mode from writeback to writeback (requires the reboot of VM).
Since 2.0.0-37016 you may adjust Libvirt XML configuration per CR.
- Log into SolusVM 2 as admin.
- Navigate to "Compute Resources" menu.
- Click the Settings
button opposite to the required CR.
- Make the requirement adjustments here:
- Click Save.
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