Hyper-v Manager Error report

Question

I am trying to start a new VM in my Hyper-v and I am getting the error "Data supplied is of wrong type.(0x8007065D). When I search this issue all I find is indfo dealing with phones even though I put in search for Hypervisor error. Does anyone know how to resolve this issue?

Answer 1

After hours of lost time researching the fix for this, I stumbled across a recent change that was to enable a fix for Speculative Execution.

It was not possible (for me anyway) to roll this fix back, however, I did notice that a single registry key was either missing or of wrong value. As soon as I corrected this value to a string, Hyper-V virtual machines started immediately without any restart.

I got the fix from here https://community.tenable.com/s/article/Speculative-Execution-Side-Channel-Vulnerability-Plugin-and-Mitigation-Information

The key in question is

reg add "HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows NT\CurrentVersion\Virtualization" /v MinVmVersionForCpuBasedMitigations /t REG_SZ /d "1.0" /f

Answer 2

What's in the event logs? Do you have a screenshot?

Answer 3

The event logs for the Hyper-v VMMX say the same issue and also say Vm failed to start.

Answer 4

Ok, well based on the limited info you're able to give I'd suggest standing up a new one for testing.

--please don't forget to upvote and Accept as answer if the reply is helpful--

Answer 5

I am off today but we have tried to make 3 different test machines and all three have had the same issue.