Seems fair enough to require data exchanged between the kernel module
and user processes in the same bit-ness, but I'm wondering about
support for larger memory sizes via something like PAE on 32-bit
systems. The usable memory size is quite sharply limited at 2GB, which
works well enough for various *nix platforms but not so well for
Windows. I'm looking to get to a 64-bit system, but moving to Snow
Leopard is a problem for me, as I'm using ZFS, which is less well
supported under 10.6, the more so with 64-bit. My preferred option
would be moving to OpenSolaris, but I need USB support for the
OpenSolaris host and support for OS X guests. Any chance these
features have been worked over sufficiently that will be released in
3.2? PAE would be nice as a transition between the two host
environments, but I don't sense that there's any intention of
including this in current release plans. How close to the mark am I
here?
Von meinem iPhone gesendet
Am 18 Mar 2010 um 22:56 schrieb "Knut St. Osmundsen" <[email protected]>:
On Mar 18, 2010, at 9:50 PM, Bayard Bell wrote:
As best as I can work out, VirtualBox on Leopard could run 64-bit
VM processes to increase the amount of resources available to a VM
(this isn't required to allow the VM to run a 64-bit OS, but the 64-
bit OS isn't going to have a whole lot of resources available to it
if the VM has to run under 32-bit process constraints).
We cannot run the VirtualBox process as 64-bit if the kernel is 32-
bit. The VirtualBox VM process has to use the same number of bits
for pointers as the kernel does. This is mainly because we are
sharing data structures between kernel space, but also because lots
of code simply assumes that the bit counts match (like R3R0PTRTYPE
and all its users). I fear the code will not benefit from trying to
address these issues (#ifdef orgy, structure alignment hell, etc.),
otherwise we would probably have looked into it by now.
If you want to run a 64-bit VirtualBox on OS X, I suggest you run
Snow Leopard with the 64-bit kernel.
--
Kind regards / Mit freundlichen Gruessen / Vennlig hilsen,
Knut
--
Sun Microsystems GmbH Knut St. Osmundsen
Werkstrasse 24 Senior Staff Engineer, VirtualBox
71384 Weinstadt, Germany mailto:[email protected]
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