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CPU Virtualization Support

How to tell if your processor supports Virtualization.

egrep 'vmx|svm' /proc/cpuinfo


cat /proc/cpuinfo

And look for the following CPU flags

  • vmx – (intel)
  • svm – (amd)

If your cpuinfo file has a flag "svm" then you have AMD-v hardware virtualization support (aka pacifica) on your cpu.

KVM ACPI Shutdown of Guests

These are hacks that allow guest system to be shutdown using the virtsh shutdown command. I found problems with WinXP and Ubuntu Lucid when trying to do a shutdown. This should be cleaner than using the destroy option.

Shutdown Guest Script for RedHat / CentOS 5.5

Here is a script I put together that will shutdown guests systems On Redhat and CentOS 5.5 systems. I think this method is more clean if you forget to shutdown all virtual systems before you shutdown the host system. You need to make sure that all guests can be turned off with ACPI Shutdown from libvirtd.

KVM Shutdown

The above link should be save to /etc/init.d, permission set to 755, and then enables with chkconfig.

cp kvm_shutdown.txt /etc/init.d/kvm_shutdown
chmod 755 /etc/init.d/kvm_shutdown
chkconfig --add kvm_shutdown

The script will go through all running systems and send the virsh shutdown sys_name command. It will test every 5 seconds for 90 seconds to see if the system are still up. If the systems are down, it will exit and the host will continue to shutdown. If after 90 seconds systems are still running, the script will send a destroy command to the ones left running.

Ubuntu Lucid Desktop

Ubuntu desktop displays a dialog box for 60 seconds before it allows the image to be halted. To allow ACPI shutdown to work from KVM, acpid must be running and /etc/acpi/ needs to be modified.

At the top of /etc/acpi/, Add the halt command,

# /etc/acpi/
# Initiates a shutdown when the power putton has been
# pressed.

halt -p

[ -r /usr/share/acpi-support/power-funcs ] && . /usr/share/acpi-support/power-funcs

Fix VMware 6.5.3 on Ubuntu Karmic 9.10

Install freezes when trying to do an install. I found the following tips to work properly.

You need to be root, so do something like sudo su - and change to the directory where the vmware bundle is.

chmod 755 VMware-Workstation-6.5.3-185404.*.bundle

After the install completes, do the following.

vmware-modconfig --console --install-all

Fix vmware command if there is an issue with the mouse losing focus because the display is too big.

mv /usr/bin/vmware /usr/bin/vmware.real

and create the file /usr/bin/vmware with the following content.



/usr/bin/vmware.real $@

Make sure you chmod the file

chmod 755 /usr/bin/vmware