VirtualBox

Ticket #2884 (closed defect: fixed)

Opened 5 years ago

Last modified 4 years ago

No clear documentation about nested paging -> fixed in SVN

Reported by: john64 Owned by:
Priority: major Component: other
Version: VirtualBox 2.1.0 Keywords: nested paging nahalem vt-d
Cc: Guest type: other
Host type: other

Description

I have an Intel Core i7 cpu and according to the documentation I should be able to use Nested Paging(Section 1.2 - "Intel will ship support for nested page tables, then called "Extended Page Tables" (EPT), with their new Nehalem processors."). What is the status of this feature? Should the documentation be changed or is there a defect? I have tried a mixture of Windows Vista/XP and Fedora 10 hosts and guests and with VT-d enabled and disabled in my bios to no avail.

Here is my /proc/cpuinfo (cropped to eliminate the data repeated 8 times). I have VT-d enabled and I have an Asus P6T-Deluxe motherboard with 6gb of triple channel DDR3 in case that has any influence.

processor : 7 vendor_id : GenuineIntel cpu family : 6 model : 26 model name : Intel(R) Core(TM) i7 CPU 920 @ 2.67GHz stepping : 4 cpu MHz : 2672.717 cache size : 8192 KB physical id : 0 siblings : 8 core id : 3 cpu cores : 4 apicid : 7 initial apicid : 7 fpu : yes fpu_exception : yes cpuid level : 11 wp : yes flags : 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 ht tm pbe syscall nx rdtscp lm constant_tsc arch_perfmon pebs bts rep_good nopl pni monitor ds_cpl vmx est tm2 ssse3 cx16 xtpr sse4_1 sse4_2 popcnt lahf_lm ida bogomips : 5344.68 clflush size : 64 cache_alignment : 64 address sizes : 36 bits physical, 48 bits virtual power management:

Attachments

VBox.log Download (42.7 KB) - added by john64 5 years ago.
vbox.log

Change History

comment:1 Changed 5 years ago by sandervl73

Without a VBox.log of a session where you've turned on nested paging and VT-x I can't say a thing. Keep in mind that this is a defect tracker not the place to ask questions.

Changed 5 years ago by john64

vbox.log

comment:2 Changed 5 years ago by john64

I understand, but there is either a problem with the code or the documentation is not clear, either of which are defects

comment:3 Changed 5 years ago by sandervl73

  • Status changed from new to closed
  • Resolution set to fixed
  • Summary changed from Nested Paging Disabled on Nahalem to No clear documentation about nested paging -> fixed in SVN

You have to enable nested paging support using VBoxManage. See chapter 8.5.1. I thought this was mentioned in the documentation, but it's not. Will be corrected.

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