# Virtualization Notes

## Installation

If your processor supports vmx (cat /proc/cpuinfo | grep vmx), you can install QEMU/KVM for faster VMs.

yum install kvm kmod-kvm qemu libvirt
service libvirtd start


You can now connect to the instance with virt-manager.

## Errors

If virt-manager reports that you don’t have KVM support, check your BIOS and enable virtualization (VT for Intel processors) and power cycle the server. Then check if the kernel module is inserted properly:

lsmod | grep kvm

# If not
modprobe kvm
modprobe kvm-intel


If the last commands don’t work, make sure your kernel isn’t Xen!. I made this mistake and switching to a non-Xen kernel ensured that the KVM kernel module was inserted properly.

### could not query memory balloon allocation

You can only give a VM 4GiB of memory under QEMU

### MP-BIOS bug: 8254 timer not connected to IO_APIC

Add a noapic to your kernel boot params.