VirtualBox on FreeBSD host and Windows8 guest

[Guido van Rooij]

On Fri, Aug 24, 2012 at 03:10:22PM +0200, Bernhard Fröhlich wrote:
> On Fri, Aug 24, 2012 at 1:32 PM, Guido van Rooij <guido at freebsd.org> wrote:
> > Hi,
> >
> > I am trying to install Windows 8 in Virtualbox on a 32-bit FBSD host.
> > (FreebSD 8.3 and VB 4.1.18).
> >
> > Windows refuses to install and this is due to NX not being present (it
> > is enabled in the virtual machine settings). NX is also enabled in my
> > bios as can be seen in the boot log of the FreeBSD host:
> > CPU: Intel(R) Core(TM)2 Duo CPU     P9700  @ 2.80GHz (2793.02-MHz 686-class CPU)
> >   Origin = "GenuineIntel"  Id = 0x1067a  Family = 6  Model = 17  Stepping = 10
> >   Features=0xbfebfbff<FPU,VME,DE,PSE,TSC,MSR,PAE,MCE,CX8,APIC,SEP,MTRR,PGE,MCA,CMOV,PAT,PSE36,CLFLUSH,DTS,ACPI,MMX,FXSR,SSE,SSE2,SS,HTT,TM,PBE>
> >   Features2=0x408e3fd<SSE3,DTES64,MON,DS_CPL,VMX,SMX,EST,TM2,SSSE3,CX16,xTPR,PDCM,SSE4.1,XSAVE>
> >   AMD Features=0x20100000<NX,LM>
> >   AMD Features2=0x1<LAHF>
> >   TSC: P-state invariant
> >
> > When I create a new virtual machine with the xact same settings as the W8 host,
> > and boot a FreeSBD installation CD, I see that none of the AMD features are
> > exposed to the guest os:
> > CPU: Intel(R) Core(TM)2 Duo CPU     P9700  @ 2.80GHz (2883.13-MHz 686-class CPU)
> >   Origin = "GenuineIntel"  Id = 0x1067a  Family = 6  Model = 17  Stepping = 10
> >   Features=0x783fbff<FPU,VME,DE,PSE,TSC,MSR,PAE,MCE,CX8,APIC,SEP,MTRR,PGE,MCA,CMOV,PAT,PSE36,MMX,FXSR,SSE,SSE2>
> >   Features2=0x209<SSE3,MON,SSSE3>
> >   TSC: P-state invariant
> >
> > Is this just not supported, or is there a secret setting?
> 
> There are knobs in the processor tab in the GUI for that.
> 

Enable PAE/NX is set.
Vt-x/AMD-V is set
Nesting paging is set.

So the knowbs are set correctly, yet no NX.

-Guido