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qemu.go
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qemu.go
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// SPDX-License-Identifier: Apache-2.0
// Copyright Authors of Cilium
package runner
import (
"fmt"
"os"
"os/exec"
"runtime"
"strings"
"github.com/cilium/little-vm-helper/pkg/arch"
"github.com/sirupsen/logrus"
"golang.org/x/sys/unix"
)
func getArch(rcnf *RunConf) (arch.Arch, error) {
a := rcnf.QemuArch
if a == "" {
a = runtime.GOARCH
}
return arch.NewArch(a)
}
func BuildQemuArgs(log *logrus.Logger, rcnf *RunConf) ([]string, error) {
qemuArgs := []string{
// no need for all the default devices
"-nodefaults",
// no need display (-nographics seems a bit slower)
"-display", "none",
// don't reboot, just exit
"-no-reboot",
// cpus, memory
"-smp", fmt.Sprintf("%d", rcnf.CPU), "-m", rcnf.Mem,
}
qArch, err := getArch(rcnf)
if err != nil {
return nil, err
}
qemuArgs = qArch.AppendArchSpecificQemuArgs(qemuArgs)
// quick-and-dirty kvm detection
kvmEnabled := false
if !rcnf.DisableHardwareAccel && qArch.IsNative() {
switch runtime.GOOS {
case "linux":
if f, err := os.OpenFile("/dev/kvm", os.O_RDWR, 0755); err == nil {
qemuArgs = append(qemuArgs, "-enable-kvm")
f.Close()
kvmEnabled = true
} else {
log.Info("KVM disabled")
}
case "darwin":
qemuArgs = append(qemuArgs, "-accel", "hvf")
}
}
qemuArgs = qArch.AppendCPUKind(qemuArgs, kvmEnabled, rcnf.CPUKind)
if rcnf.SerialPort != 0 {
qemuArgs = append(qemuArgs,
"-serial",
fmt.Sprintf("telnet:localhost:%d,server,nowait", rcnf.SerialPort))
}
if rcnf.ConsoleLogFile != "" {
qemuArgs = append(qemuArgs,
"-serial",
fmt.Sprintf("file:%s", rcnf.ConsoleLogFile))
}
var kernelRoot string
switch rcnf.RootDev {
case "hda":
qemuArgs = append(qemuArgs, "-hda", rcnf.testImageFname())
kernelRoot = "/dev/sda"
case "vda":
qemuArgs = append(qemuArgs, "-drive", fmt.Sprintf("file=%s,if=virtio,index=0,media=disk", rcnf.testImageFname()))
kernelRoot = "/dev/vda"
default:
return nil, fmt.Errorf("invalid root device: %s", rcnf.RootDev)
}
if rcnf.KernelFname != "" {
console := qArch.Console()
if err != nil {
return nil, fmt.Errorf("failed retrieving console name: %w", err)
}
appendArgs := []string{
fmt.Sprintf("root=%s", kernelRoot),
fmt.Sprintf("console=%s", console),
"earlyprintk=ttyS0",
"panic=-1",
}
appendArgs = append(appendArgs, rcnf.KernelAppendArgs...)
qemuArgs = append(qemuArgs,
"-kernel", rcnf.KernelFname,
"-append", strings.Join(appendArgs, " "),
)
}
if !rcnf.DisableNetwork {
qemuArgs = append(qemuArgs, rcnf.ForwardedPorts.QemuArgs()...)
}
if !rcnf.Daemonize {
qemuArgs = append(qemuArgs,
"-serial", "mon:stdio",
"-device", "virtio-serial-pci",
)
} else {
qemuArgs = append(qemuArgs, "-daemonize")
}
if rcnf.QemuMonitorPort != 0 {
arg := fmt.Sprintf("tcp:localhost:%d,server,nowait", rcnf.QemuMonitorPort)
qemuArgs = append(qemuArgs, "-monitor", arg)
}
if len(rcnf.HostMount) > 0 {
qemuArgs = append(qemuArgs,
"-fsdev", fmt.Sprintf("local,id=host_id,path=%s,security_model=none", rcnf.HostMount),
"-device", "virtio-9p-pci,fsdev=host_id,mount_tag=host_mount",
)
}
return qemuArgs, nil
}
func StartQemu(rcnf RunConf) error {
qArch, err := getArch(&rcnf)
if err != nil {
return err
}
qemuBin := qArch.QemuBinary()
qemuArgs, err := BuildQemuArgs(rcnf.Logger, &rcnf)
if err != nil {
return err
}
if rcnf.QemuPrint || rcnf.Verbose {
var sb strings.Builder
sb.WriteString(qemuBin)
for _, arg := range qemuArgs {
sb.WriteString(" ")
if len(arg) > 0 && arg[0] == '-' {
sb.WriteString("\\\n\t")
}
sb.WriteString(arg)
}
fmt.Printf("%s\n", sb.String())
// We don't want to return early if running in verbose mode
if rcnf.QemuPrint {
return nil
}
}
qemuPath, err := exec.LookPath(qemuBin)
if err != nil {
return err
}
return unix.Exec(qemuPath, append([]string{qemuBin}, qemuArgs...), nil)
}