virtualbox.org

Hi host is Windows 10 Pro hyper v is not installed just wondering why this feature is greyed out? CPU is i7-7700HQ.

Could be that you don't have VT-x or AMD-V turned on in your computer's BIOS. See I have a 64bit host, but can't install 64bit guests

Please try to run a guest, then zip and post the guest's vbox.log, using the forum's Upload Attachment tab. This will tell us if another Windows service that uses Hyper-V is present.

i can run 64bit guests just fine. here is the log

You are only suspending / saving your guest, not shutting it down.
You cannot change settings on a saved state, the guest needs to be completely off.

powered down the guest the option is still greyed out.

That setting is greyed out on my laptop host running 6.1.2, as well. I suspect that there are certain host requirements that are necessary for the Virtualbox guest to pass VT-x further down into another Virtualbox guest running in nested virtualization. The changelog says:

Virtualization core: Support for nested hardware-virtualization on Intel CPUs (starting with 5th generation Core i, codename Broadwell), so far tested only with guest running VirtualBox

According to Wikipedia, Broadwell is dated 2014, and your i7-7700HQ is dated 2017, so unless something else is required, it should be good for nested virtualization.

Your log shows unrestricted use of VT-x for Virtualbox, so Hyper-V shouldn't be getting in the way.

'Tis a puzzle.

Is your guest running well? Are you trying to run nested virtualization?

guest is running well and yes id like to have the option to use nested.

I'll have to drop out of this one then, I don't know how to troubleshoot nested virtualization setups. I'll stay tuned, though.