[Bug 211651] emulators/virtualbox-ose-kmod 5.0.26_1 with Linux guest crashes 12.0-CURRENT host when # of processors > 1

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=211651

--- Comment #8 from Don Lewis <truckman at FreeBSD.org> ---
If I try to disable the AMD-V setting, Virtualbox complains "Invalid Settings
Detected".  If I disable virtualization in the BIOS, Virtualbox only seems to
understand 32-bit guests.

I hadn't gone spelunking in the .kmod source because the stack traces fooled me
into thinking that the code was not part of the .kmod.

ASMXRstore() is called from CPUMSetGuestXcr0(PVMCPU pVCpu, uint64_t uNewValue)
here:
<https://www.virtualbox.org/browser/vbox/trunk/src/VBox/VMM/VMMAll/CPUMAllRegs.cpp>.
 Perhaps it just needs added calls to fpu_kern_enter() and fpu_kern_leave().

Interestingly I don't see any calls to ASMXSave().

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