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// Copyright 2018 Google LLC
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
package cpuid
import (
"fmt"
"io/ioutil"
"regexp"
"strconv"
"strings"
"syscall"
"testing"
)
func kernelVersion() (int, int, error) {
var u syscall.Utsname
if err := syscall.Uname(&u); err != nil {
return 0, 0, err
}
var r string
for _, b := range u.Release {
if b == 0 {
break
}
r += string(b)
}
s := strings.Split(r, ".")
if len(s) < 2 {
return 0, 0, fmt.Errorf("kernel release missing major and minor component: %s", r)
}
major, err := strconv.Atoi(s[0])
if err != nil {
return 0, 0, fmt.Errorf("error parsing major version %q in %q: %v", s[0], r, err)
}
minor, err := strconv.Atoi(s[1])
if err != nil {
return 0, 0, fmt.Errorf("error parsing minor version %q in %q: %v", s[1], r, err)
}
return major, minor, nil
}
// TestHostFeatureFlags tests that all features detected by HostFeatureSet are
// on the host.
//
// It does *not* verify that all features reported by the host are detected by
// HostFeatureSet.
//
// i.e., test that HostFeatureSet is a subset of the host features.
func TestHostFeatureFlags(t *testing.T) {
cpuinfoBytes, _ := ioutil.ReadFile("/proc/cpuinfo")
cpuinfo := string(cpuinfoBytes)
t.Logf("Host cpu info:\n%s", cpuinfo)
major, minor, err := kernelVersion()
if err != nil {
t.Fatalf("Unable to parse kernel version: %v", err)
}
re := regexp.MustCompile(`(?m)^flags\s+: (.*)$`)
m := re.FindStringSubmatch(cpuinfo)
if len(m) != 2 {
t.Fatalf("Unable to extract flags from %q", cpuinfo)
}
cpuinfoFlags := make(map[string]struct{})
for _, f := range strings.Split(m[1], " ") {
cpuinfoFlags[f] = struct{}{}
}
fs := HostFeatureSet()
// All features have a string and appear in host cpuinfo.
for f := range fs.Set {
name := f.flagString(false)
if name == "" {
t.Errorf("Non-parsable feature: %v", f)
}
// Special cases not consistently visible. We don't mind if
// they are exposed in earlier versions.
switch {
// Block 0.
case f == X86FeatureSDBG && (major < 4 || major == 4 && minor < 3):
// SDBG only exposed in
// b1c599b8ff80ea79b9f8277a3f9f36a7b0cfedce (4.3).
continue
// Block 2.
case f == X86FeatureRDT && (major < 4 || major == 4 && minor < 10):
// RDT only exposed in
// 4ab1586488cb56ed8728e54c4157cc38646874d9 (4.10).
continue
// Block 3.
case f == X86FeatureAVX512VBMI && (major < 4 || major == 4 && minor < 10):
// AVX512VBMI only exposed in
// a8d9df5a509a232a959e4ef2e281f7ecd77810d6 (4.10).
continue
case f == X86FeatureUMIP && (major < 4 || major == 4 && minor < 15):
// UMIP only exposed in
// 3522c2a6a4f341058b8291326a945e2a2d2aaf55 (4.15).
continue
case f == X86FeaturePKU && (major < 4 || major == 4 && minor < 9):
// PKU only exposed in
// dfb4a70f20c5b3880da56ee4c9484bdb4e8f1e65 (4.9).
continue
// Block 4.
case f == X86FeatureXSAVES && (major < 4 || major == 4 && minor < 8):
// XSAVES only exposed in
// b8be15d588060a03569ac85dc4a0247460988f5b (4.8).
continue
}
hidden := f.flagString(true) == ""
_, ok := cpuinfoFlags[name]
if hidden && ok {
t.Errorf("Unexpectedly hidden flag: %v", f)
} else if !hidden && !ok {
t.Errorf("Non-native flag: %v", f)
}
}
}
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