Nested VT-x triple fault

Postings relating to old VirtualBox pre-releases
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mhanor
Volunteer
Posts: 321
Joined: 7. Oct 2009, 12:40
Primary OS: MS Windows 10
VBox Version: PUEL
Guest OSses: various

Nested VT-x triple fault

Post by mhanor »

I've tried booting nested VirtualBox VM Windows 10 1903 x64 ISO and a Windows XP 32 bit, inside a VM with two CPUs, but all I got is triple fault guru meditation, when the nested VM started.
The log is the attempt to boot the Windows 10 1903 x64 setup ISO. The nested VirtualBox was also 6.1.0beta1
Attachments
VBox.zip
(74.59 KiB) Downloaded 50 times
Technologov
Volunteer
Posts: 3342
Joined: 10. May 2007, 16:59
Location: Israel

Nested VT-x crash

Post by Technologov »

Level 0 = host. (Win10, 64-bit + Intel Core i7 6600U, Skylake CPU) - VBox 6.1.0-BETA1
Level 1 = 1st level of virtualization.
Level 2 = 2nd level of virtualization, going deeper into the rabbit hole.

Level 1 = Windows XP + VBox 4.1.6 (older, with official WinXP host support and VT-x enabled)
Level 2 = empty VM (VT-x enabled) -- I expected to see VirtualBox BIOS booting and that's it.

Actual results:
Crash with Guru meditation. (which means that Nested VT-x is incomplete, at least in 32-bit mode --- theoretically this should work.)
Attachments
Nested VT-x crash of Level1 hypervisor. Screenshot
Nested VT-x crash of Level1 hypervisor. Screenshot
Nested-VT-x.png (72.13 KiB) Viewed 15712 times
Nested-VT-x--Level1-ZeroVM-2019-09-24-18-40-59.zip
Nested VT-x, Level0, vbox.log
(22.37 KiB) Downloaded 53 times
Nested-VT-x-level0-Windows XP-2019-09-24-20-41-12.zip
Nested VT-x, Level0, vbox.log
(27.43 KiB) Downloaded 63 times
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