[Bug 230460] emulators/virtualbox-ose panic on CURRENT

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=230460

--- Comment #22 from Vladimir Kondratyev <wulf at freebsd.org> ---
(In reply to Konstantin Belousov from comment #20)

> 1. Why vbox needs to access userspace
> 2. If the item 1 is legitimate, why doesn't vbox use copyin(9) KPI.
<CITE>
For historic reasons, VirutalBox kernel code needs to access user-level code
because the complete virtual memory of the guest is mapped on the host side and
on 32-bit hosts we have the 1G limitation in the kernel part of the address
space (3G for userland, 1G for kernel, kernel starts at 0xC0000000). And we
don't want to limit guests on 32-bit hosts to 1GB RAM.
<\CITE>

https://www.virtualbox.org/ticket/13820

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