/usr/sbin/kvm-ok is in cpu-checker 0.7-0ubuntu7.
This file is owned by root:root, with mode 0o755.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 | #!/bin/sh
#
# kvm-ok - check whether the CPU we're running on supports KVM acceleration
# Copyright (C) 2008-2010 Canonical Ltd.
#
# Authors:
# Dustin Kirkland <kirkland@canonical.com>
# Kees Cook <kees.cook@canonical.com>
#
# This program is free software: you can redistribute it and/or modify
# it under the terms of the GNU General Public License version 3,
# as published by the Free Software Foundation.
#
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with this program. If not, see <http://www.gnu.org/licenses/>.
set -e
assert_root() {
if [ "$(id -u)" != "0" ]; then
echo "INFO: For more detailed results, you should run this as root"
echo "HINT: sudo $0"
exit 1
fi
}
verdict() {
# Print verdict
if [ "$1" = "0" ]; then
echo "KVM acceleration can be used"
exit 0
else
echo "KVM acceleration can NOT be used"
exit 1
fi
}
ARM_CPU_PART_CORTEX_A15="0xc0f" # <asm/cputype.h>
# check cpu flags for capability
case "$(uname -m)" in
armv7l)
if egrep -m1 -w '^CPU part[[:blank:]]*:' /proc/cpuinfo | \
egrep -wq "$ARM_CPU_PART_CORTEX_A15"; then
virt="ARM"
kvm_mod="kvm"
fi
;;
aarch64)
virt="ARM"
kvm_mod="kvm"
;;
ppc64le|ppc64|s390x)
# FIXME: Assume that all POWER and z/Systems are KVM capable
virt="generic"
kvm_mod="kvm"
;;
*)
virt=$(egrep -m1 -w '^flags[[:blank:]]*:' /proc/cpuinfo | egrep -wo '(vmx|svm)') || true
[ "$virt" = "vmx" ] && kvm_mod="kvm_intel"
[ "$virt" = "svm" ] && kvm_mod="kvm_amd"
;;
esac
if [ -z "$virt" ]; then
echo "INFO: Your CPU does not support KVM extensions"
assert_root
verdict 1
fi
# Now, check that the device exists
if [ -e /dev/kvm ]; then
echo "INFO: /dev/kvm exists"
verdict 0
else
echo "INFO: /dev/kvm does not exist"
echo "HINT: sudo modprobe $kvm_mod"
fi
assert_root
# Prepare MSR access
msr="/dev/cpu/0/msr"
if [ ! -r "$msr" ]; then
modprobe msr
fi
if [ -e "$msr" -a ! -r "$msr" ]; then
echo "You must be root to run this check." >&2
exit 2
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
elif [ "$virt" = "ARM" ]; then
# Should also test that we booted in HYP mode, if detectable
:
elif [ "$virt" = "generic" ]; then
:
else
echo "FAIL: Unknown virtualization extension: $virt"
verdict 1
fi
if [ "$disabled" -eq 1 ]; then
echo "INFO: KVM ($virt) is disabled by your BIOS"
echo "HINT: Enter your BIOS setup and enable Virtualization Technology (VT),"
echo " and then hard poweroff/poweron your system"
verdict 1
fi
verdict 0
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