How to check if VT-X is enabled in BIOS? I have vmx in CPU flags, and no access to the BIOS.

(I need to install a KVM VM on RedHat Enterprise Linux 6.1).

1 Answer 1



cat /proc/cpuinfo and see if there is vmx (Intel) or svm for AMD based.

or Try dmidecode it should provide a lot of information about your BIOS settings.

From thier website:

dmidecode is packaged for several Linux and BSD distributions (Debian, Gentoo, openSUSE and FreeBSD among others), either as a single package or included in a more generic tool set.

It should be on the repos of your distro, or installed on your system already.

UPDATE: I have found your question here and here, but I'm unable to verify whether the above commands are give you the BIOS configuration status, or just your CPU abilities.

  • I know to check cpuinfo, as I said. I saw thoses links but they give no useful info. There seems to be a solution.. for DOS! The BIOS Writer approach requires access to the BIOS (!) which I say I don't have.
    – ExpertNoob
    Commented Dec 19, 2011 at 18:39
  • dmidecode seems to not be very specific, and very hardware-dependent.. "dmidecode | grep -i virt" only finds CPU flags accessible in cpuinfo.
    – ExpertNoob
    Commented Dec 19, 2011 at 19:04

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