https://communities.vmware.com/t5/VMware-Workstation-Pro/Use-hardware-virtualization/m-p/2852510#M170299 <P>I have used hardware assisted virtualization in over a year now.<BR />The difference in performance is huge. But last week is stop working.<BR />This is critical as I spend most of my workday in VmWare.<BR /><BR />I got a message</P><P><STRONG>VMware Workstation does not support nested virtualization on this host.</STRONG><BR /><STRONG>Module 'MonitorMode' power on failed.</STRONG><BR /><STRONG>Failed to start the virtual machine.</STRONG><BR /><BR />If I uncheck checkbox Settings/Processors/Virtualize Intel VT-x/EPT or AMD-V/RVI<BR />the VM starts fine but with slower performance.<BR /><BR /></P><P>So something must have changed!<BR />I suspect a Windows update.<BR /><BR />I use VmWare WorkStation Pro 15.5.7 Build-17171714<BR />Host: Windows 10 Enterprise 20H2&nbsp; 64-bit<BR />Guest: Windows 10 Pro 20H2&nbsp; &nbsp;64-bit<BR /><BR />CPU is Intel Core I7 9th generation with 32 GB RAM.<BR /><BR />What are my options ?</P><UL><LI>First I try to contact support. But it was incredible complicated, Maybe I have to buy support ?</LI><LI>Upgrade to latest VmWare 16.1 ? I can do that if I am sure it helps.</LI><LI>I suspect Hyper-V is still active and cause a conflict with VmWare hypervisor. But how do I turn off Hyper-V apart from the obvious in "Turn Windows features off and on" ?</LI></UL> Mon, 14 Jun 2021 09:03:50 GMT Attracs 2021-06-14T09:03:50Z https://communities.vmware.com/t5/VMware-Workstation-Pro/Use-hardware-virtualization/m-p/2852510#M170299 <P>I have used hardware assisted virtualization in over a year now.<BR />The difference in performance is huge. But last week is stop working.<BR />This is critical as I spend most of my workday in VmWare.<BR /><BR />I got a message</P><P><STRONG>VMware Workstation does not support nested virtualization on this host.</STRONG><BR /><STRONG>Module 'MonitorMode' power on failed.</STRONG><BR /><STRONG>Failed to start the virtual machine.</STRONG><BR /><BR />If I uncheck checkbox Settings/Processors/Virtualize Intel VT-x/EPT or AMD-V/RVI<BR />the VM starts fine but with slower performance.<BR /><BR /></P><P>So something must have changed!<BR />I suspect a Windows update.<BR /><BR />I use VmWare WorkStation Pro 15.5.7 Build-17171714<BR />Host: Windows 10 Enterprise 20H2&nbsp; 64-bit<BR />Guest: Windows 10 Pro 20H2&nbsp; &nbsp;64-bit<BR /><BR />CPU is Intel Core I7 9th generation with 32 GB RAM.<BR /><BR />What are my options ?</P><UL><LI>First I try to contact support. But it was incredible complicated, Maybe I have to buy support ?</LI><LI>Upgrade to latest VmWare 16.1 ? I can do that if I am sure it helps.</LI><LI>I suspect Hyper-V is still active and cause a conflict with VmWare hypervisor. But how do I turn off Hyper-V apart from the obvious in "Turn Windows features off and on" ?</LI></UL> Mon, 14 Jun 2021 09:03:50 GMT https://communities.vmware.com/t5/VMware-Workstation-Pro/Use-hardware-virtualization/m-p/2852510#M170299 Attracs 2021-06-14T09:03:50Z