Nested virtulzation is greyed out

[therock247uk]

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

[scottgus1]

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.

[therock247uk]

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

VBox.zip

(36.06 KiB) Downloaded 18 times

[Martin]

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.

[therock247uk]

powered down the guest the option is still greyed out.

[scottgus1]

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?

[therock247uk]

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

[scottgus1]

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.