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include $(TOPDIR)/rules.mk
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PKG_NAME:=cpu-checker
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PKG_VERSION:=0.7
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PKG_RELEASE:=1
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PKG_LICENSE:=GPL-3.0
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include $(INCLUDE_DIR)/package.mk
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define Package/cpu-checker
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SECTION:=utils
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CATEGORY:=Utilities
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PKGARCH:=all
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TITLE:=tools to help evaluate certain CPU (or BIOS) features
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DEPENDS:=+getopt +TARGET_x86:msr-tools
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URL:=https://git.launchpad.net/ubuntu/+source/cpu-checker/
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endef
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define Package/cpu-checker/description
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There are some CPU features that are filtered or disabled by system BIOSes.
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This set of tools seeks to help identify when certain features are in this state,
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based on kernel values, CPU flags and other conditions. Supported feature tests
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are NX/XD and VMX/SVM.
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endef
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define Build/Configure
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endef
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define Build/Compile
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endef
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define Package/cpu-checker/install
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$(INSTALL_DIR) $(1)/usr/sbin
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$(INSTALL_BIN) ./files/{kvm-ok,check-bios-nx} \
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$(1)/usr/sbin/
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endef
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$(eval $(call BuildPackage,cpu-checker))
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Executable
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#!/bin/sh
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# Copyright 2010, Canonical, Ltd.
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# License: GPLv2
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# Author: Kees Cook <kees@ubuntu.com>
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set -e
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export LANG=C
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usage() {
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echo "Usage: $0 [options]"
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echo ""
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echo "Options:"
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echo " -h, --help show this help message and exit"
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echo " --verbose Explain in detail what has been detected"
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}
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report() {
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if [ -n "$VERBOSE" ]; then
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echo "$@" >/dev/stderr
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fi
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}
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VERBOSE=
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TEMP=$(getopt -o h --long verbose,help -n check-bios-nx -- "$@")
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eval set -- "$TEMP"
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while :; do
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case "$1" in
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-h|--help) usage ; exit 0 ;;
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--verbose) VERBOSE=1; shift ;;
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--) shift ; break ;;
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*) usage >&2 ; exit 2 ;;
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esac
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done
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export VERBOSE
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if ! uname -m | egrep -q '^(i.86|x86_64)$' ; then
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report "This script is currently only useful on x86-based CPUs"
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exit 0
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fi
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# Prepare MSR access
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msr="/dev/cpu/0/msr"
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if [ ! -r "$msr" ]; then
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modprobe msr
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fi
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if [ ! -r "$msr" ]; then
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echo "$0: You must be root to run this check." >&2
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exit 2
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fi
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# Check MSR_IA32_MISC_ENABLE's bit 34, NX_DISABLE
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BIT=$(rdmsr --bitfield 34:34 0x1a0 2>/dev/null || true)
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if [ "$BIT" = "1" ]; then
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report "FAIL: the NX bit is being filtered by the BIOS on this CPU!"
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exit 1
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else
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if egrep -m1 -q '^flags[[:blank:]]*:.*\<nx\>' /proc/cpuinfo ; then
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report "ok: the NX bit is operational on this CPU."
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else
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report "WARNING: the NX bit is not available for this CPU."
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fi
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fi
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exit 0
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Executable
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#!/bin/sh
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#
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# kvm-ok - check whether the CPU we're running on supports KVM acceleration
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# Copyright (C) 2008-2010 Canonical Ltd.
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#
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# Authors:
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# Dustin Kirkland <kirkland@canonical.com>
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# Kees Cook <kees.cook@canonical.com>
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#
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# This program is free software: you can redistribute it and/or modify
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# it under the terms of the GNU General Public License version 3,
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# as published by the Free Software Foundation.
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#
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# This program is distributed in the hope that it will be useful,
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# but WITHOUT ANY WARRANTY; without even the implied warranty of
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# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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# GNU General Public License for more details.
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#
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# You should have received a copy of the GNU General Public License
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# along with this program. If not, see <http://www.gnu.org/licenses/>.
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set -e
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assert_root() {
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if [ "$(id -u)" != "0" ]; then
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echo "INFO: For more detailed results, you should run this as root"
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echo "HINT: sudo $0"
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exit 1
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fi
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}
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verdict() {
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# Print verdict
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if [ "$1" = "0" ]; then
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echo "KVM acceleration can be used"
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exit 0
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else
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echo "KVM acceleration can NOT be used"
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exit 1
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fi
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}
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ARM_CPU_PART_CORTEX_A15="0xc0f" # <asm/cputype.h>
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# check cpu flags for capability
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case "$(uname -m)" in
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armv7l)
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if egrep -m1 -w '^CPU part[[:blank:]]*:' /proc/cpuinfo | \
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egrep -wq "$ARM_CPU_PART_CORTEX_A15"; then
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virt="ARM"
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kvm_mod="kvm"
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fi
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;;
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aarch64)
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virt="ARM"
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kvm_mod="kvm"
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;;
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ppc64le|ppc64|s390x)
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# FIXME: Assume that all POWER and z/Systems are KVM capable
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virt="generic"
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kvm_mod="kvm"
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;;
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riscv64)
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virt="RISCV"
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kvm_mod="kvm"
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;;
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loongarch64)
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virt="LOONGARCH"
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kvm_mod="kvm"
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;;
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*)
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virt=$(egrep -m1 -w '^flags[[:blank:]]*:' /proc/cpuinfo | egrep -wo '(vmx|svm)') || true
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[ "$virt" = "vmx" ] && kvm_mod="kvm_intel"
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[ "$virt" = "svm" ] && kvm_mod="kvm_amd"
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;;
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esac
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if [ -z "$virt" ]; then
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echo "INFO: Your CPU does not support KVM extensions"
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assert_root
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verdict 1
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fi
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# Now, check that the device exists
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if [ -e /dev/kvm ]; then
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echo "INFO: /dev/kvm exists"
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verdict 0
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else
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echo "INFO: /dev/kvm does not exist"
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echo "HINT: sudo modprobe $kvm_mod"
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fi
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assert_root
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# Prepare MSR access
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msr="/dev/cpu/0/msr"
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if [ ! -r "$msr" ]; then
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modprobe msr
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fi
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if [ -e "$msr" -a ! -r "$msr" ]; then
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echo "You must be root to run this check." >&2
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exit 2
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fi
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echo "INFO: Your CPU supports KVM extensions"
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disabled=0
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# check brand-specific registers
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if [ "$virt" = "vmx" ]; then
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BIT=$(rdmsr --bitfield 0:0 0x3a 2>/dev/null || true)
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if [ "$BIT" = "1" ]; then
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# and FEATURE_CONTROL_VMXON_ENABLED_OUTSIDE_SMX clear (no tboot)
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BIT=$(rdmsr --bitfield 2:2 0x3a 2>/dev/null || true)
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if [ "$BIT" = "0" ]; then
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disabled=1
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fi
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fi
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elif [ "$virt" = "svm" ]; then
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BIT=$(rdmsr --bitfield 4:4 0xc0010114 2>/dev/null || true)
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if [ "$BIT" = "1" ]; then
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disabled=1
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fi
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elif [ "$virt" = "ARM" ]; then
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# Should also test that we booted in HYP mode, if detectable
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:
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elif [ "$virt" = "RISCV" ]; then
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# Should also test that we booted in HS mode, if detectable
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:
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elif [ "$virt" = "LOONGARCH" ]; then
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# Should also test that we booted in LVZ mode, if detectable
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:
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elif [ "$virt" = "generic" ]; then
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:
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else
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echo "FAIL: Unknown virtualization extension: $virt"
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verdict 1
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fi
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if [ "$disabled" -eq 1 ]; then
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echo "INFO: KVM ($virt) is disabled by your BIOS"
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echo "HINT: Enter your BIOS setup and enable Virtualization Technology (VT),"
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echo " and then hard poweroff/poweron your system"
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verdict 1
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fi
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verdict 0
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