Nested VT-x triple fault

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Nested VT-x triple fault

Postby mhanor » 23. Sep 2019, 22:58

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 17 times
mhanor
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Nested VT-x crash

Postby Technologov » 24. Sep 2019, 19:48

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.png
Nested VT-x crash of Level1 hypervisor. Screenshot
Nested-VT-x.png (72.13 KiB) Viewed 809 times
Nested-VT-x--Level1-ZeroVM-2019-09-24-18-40-59.zip
Nested VT-x, Level0, vbox.log
(22.37 KiB) Downloaded 17 times
Nested-VT-x-level0-Windows XP-2019-09-24-20-41-12.zip
Nested VT-x, Level0, vbox.log
(27.43 KiB) Downloaded 16 times
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