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I have a laptop with Intel Core i5 M 450 @ 2.40GHz which apparently has VT-x but not VT-d. I have Ubuntu 12.04 32bit but would like to have a virtual 64bit terminal-based Linux running on it. How do I know if the BIOS has this VT-x feature activated without having to reboot?
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There are two ways to verify: On Debian-based distros (such as Ubuntu), you can check support for VT-x by installing cpu-checker and run kvm-ok with sudo rights. On Debian-based and RHEL-based systems, you can use virt-host-validate which is provided by the libvirt-client package.
Go to the download location and double-click the file to open it. Once open, click the CPU Technologies tab. See if the “Intel Virtualization Technology” box is marked. If it is, then Intel Virtualization Technology is enabled on your computer.
Press or Tap F1to enter into BIOS Setup. Navigate to Security tab, then press Enter on Virtualization. Select Intel(R) Virtualization Technology, Press Enter, choose Enable and press Enter. Press F10.
If VT-d is enabled, Linux will configure DMA Remapping at boot time. The easiest way to find this is to look in dmesg for DMAR entries. If you don't see errors, then VT-d is enabled. Either way, you're looking for that last line, DMAR-IR: Enabled IRQ remapping in <whichever> mode .
You can use rdmsr from msr-tools to read register IA32_FEATURE_CONTROL (address 0x3a). The kernel module msr has to be loaded for this.
On most Linux systems:
sudo modprobe msr sudo rdmsr 0x3a Values 3 and 5 mean it's activated.
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