No Virtualization checkbox (Vbox 2.0.2, Ubuntu host)

kill-9 · Post by **kill-9** » 18. Sep 2008, 22:52

I just upgraded to Virtualbox 2.0.2 and now I can't enable VT-X on my machine (I could before!). The box is greyed out, so I can't do anything about this. I've run a "vboxdrv setup" and rebooted but still nothing. any ideas?

My cpu is an E4500 so it does have these extentions.

Post by **TerryE** » 18. Sep 2008, 23:13

See the Forum FAQ. You need to have then enabled in your BIOS as well. Most BIOSes turn them off by default. When this happens this is the same as being in a guest OS. You loose access to VT-x.

kill-9 · Post by **kill-9** » 18. Sep 2008, 23:49

TerryE wrote:See the Forum FAQ. You need to have then enabled in your BIOS as well. Most BIOSes turn them off by default. When this happens this is the same as being in a guest OS. You loose access to VT-x.

It was working fine up until this version. It is enabled in the BIOS.

Post by **TerryE** » 19. Sep 2008, 00:28

Could you take one of your recent logs and copy the CPUID Dump section here as a

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 block.  It starts with the line containing [b]Logical host processors:[/b] through to [b]End of CPUID dump[/b].

kill-9 · Post by **kill-9** » 19. Sep 2008, 03:50

TerryE wrote:Could you take one of your recent logs and copy the CPUID Dump section here as a
Code: Select all
 block.  It starts with the line containing [b]Logical host processors:[/b] through to [b]End of CPUID dump[/b].[/quote]

Sorry but where would that be? This is a vbox log?

Post by **TerryE** » 19. Sep 2008, 04:53

In your $HOME/.VirtualBox/Machines/<machine>/Logs/VBox.log

kill-9 · Post by **kill-9** » 19. Sep 2008, 04:57

TerryE wrote:In your $HOME/.VirtualBox/Machines/<machine>/Logs/VBox.log

Nevermind, I appologize. All version of vbox up until now were wrong. My cpu doesn't support virt extentions.

http://en.wikipedia.org/wiki/List_of_In ... processors

Post by **TerryE** » 19. Sep 2008, 05:09

Don't worry, you only really need VT-x if you want to run a 64-bit VM (or need a guest with more than 2Gb RAM). The performance advantages of 64-bit guests are really questionable. 32-bit is really great for most things. Maybe in a couple of years we may need 64-bit guests but by then you'll have probably upgraded by then if you need this.

I thought that VMware had the same restrictions but another poster claimed not. If you really need 64-bit guests then you can try this or go down the Xen/KVM route.

kill-9 · Post by **kill-9** » 19. Sep 2008, 05:17

TerryE wrote:Don't worry, you only really need VT-x if you want to run a 64-bit VM (or need a guest with more than 2Gb RAM). The performance advantages of 64-bit guests are really questionable. 32-bit is really great for most things. Maybe in a couple of years we may need 64-bit guests but by then you'll have probably upgraded by then if you need this.

I thought that VMware had the same restrictions but another poster claimed not. If you really need 64-bit guests then you can try this or go down the Xen/KVM route.

It does have advantages other than 64bit OSes, however I don't really need it anyway since I am using it to experiment. Thanks for the help!