Feature request: Check if cpu supports KVM in install script

[kt-prc]

Add a check to the installer to flag if the CPU does not support KVM.

Something similar to kvm-ok.sh from Ubuntu's cpu-checker package would work.

I have thrown together a stripped version of kvm-ok below:

#!/bin/sh


verdict() {
	# Return verdict
	if [ "$1" = "0" ]; then
		# KVM is usable
        echo "INFO: KVM acceleration can be used"
		exit 0
	else
        # KVM is not usable
		echo "INFO: KVM acceleration can NOT be used"
		exit 1
	fi
}

# check cpu flags for capability
virt=$(egrep -m1 -w '^flags[[:blank:]]*:' /proc/cpuinfo | egrep -wo '(vmx|svm)') || true
[ "$virt" = "vmx" ] && brand="intel"
[ "$virt" = "svm" ] && brand="amd"

if [ -z "$virt" ]; then
    # no kvm support from CPU
	verdict 1
fi

# Now, check that the device exists
if [ -e /dev/kvm ]; then
    # KVM is usable
	verdict 0
fi


echo "INFO: Your CPU supports KVM extensions"

disabled=0
# check brand-specific registers
if [ "$virt" = "vmx" ]; then
        BIT=$(rdmsr --bitfield 0:0 0x3a 2>/dev/null || true)
        if [ "$BIT" = "1" ]; then
                # and FEATURE_CONTROL_VMXON_ENABLED_OUTSIDE_SMX clear (no tboot)
                BIT=$(rdmsr --bitfield 2:2 0x3a 2>/dev/null || true)
                if [ "$BIT" = "0" ]; then
			        disabled=1
                fi
        fi

elif [ "$virt" = "svm" ]; then
        BIT=$(rdmsr --bitfield 4:4 0xc0010114 2>/dev/null || true)
        if [ "$BIT" = "1" ]; then
		    disabled=1
        fi
else
    # Unknown virtualization extension
	verdict 1
fi

if [ "$disabled" -eq 1 ]; then
    # KVM disabled in BIOS
	verdict 1
fi

verdict 0