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Add qemu virtiofs command line option

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Enables support for C version of virtiofs
A qemu option allows to specify virtiofsd path.
config.StatePath is used for storing the virtiofs sockets
Note that virtiofsd requires to start as root

Signed-off-by: Frédéric Dalleau <frederic.dalleau@docker.com>
This commit is contained in:
Frédéric Dalleau 2023-01-02 16:31:32 +01:00
parent f0f21bec52
commit 13426fe805
1 changed files with 108 additions and 62 deletions
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50
src/cmd/linuxkit/run_qemu.go
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@ -45,6 +45,8 @@ type QemuConfig struct {
UUID uuid.UUID
USB bool
Devices []string
VirtiofsdBinPath string
VirtiofsShares []string
}
const (
@ -136,6 +138,8 @@ func runQEMUCmd() *cobra.Command {
usbEnabled bool
deviceFlags multipleFlag
publishFlags multipleFlag
virtiofsdCmd string
virtiofsShares []string
)
cmd := &cobra.Command{
@ -300,13 +304,22 @@ func runQEMUCmd() *cobra.Command {
UUID: vmUUID,
USB: usbEnabled,
Devices: deviceFlags,
VirtiofsdBinPath: virtiofsdCmd,
VirtiofsShares: virtiofsShares,
}
config, err = discoverBinaries(config)
config, err = discoverQemu(config)
if err != nil {
return err
}
if len(config.VirtiofsShares) > 0 {
config, err = discoverVirtiofsd(config)
if err != nil {
return err
}
}
if err = runQemuLocal(config); err != nil {
return err
}
@ -351,6 +364,10 @@ func runQEMUCmd() *cobra.Command {
cmd.Flags().BoolVar(&usbEnabled, "usb", false, "Enable USB controller")
cmd.Flags().Var(&deviceFlags, "device", "Add USB host device(s). Format driver[,prop=value][,...] -- add device, like -device on the qemu command line.")
// Filesystems
cmd.Flags().StringVar(&virtiofsdCmd, "virtiofsd", "", "Path to virtiofsd binary (otherwise look in /usr/lib/qemu and /usr/local/lib/qemu)")
cmd.Flags().StringArrayVar(&virtiofsShares, "virtiofs", []string{}, "Directory shared on virtiofs")
return cmd
}
@ -398,6 +415,25 @@ func runQemuLocal(config QemuConfig) error {
return fmt.Errorf("Detached mode is only supported when running in a container, not locally")
}
if len(config.VirtiofsShares) > 0 {
args = append(args, "-object", "memory-backend-memfd,id=mem,size="+config.Memory+"M,share=on", "-numa", "node,memdev=mem")
}
for index, source := range config.VirtiofsShares {
socket := filepath.Join(config.StatePath, fmt.Sprintf("%s%d", "virtiofs", index))
cmd := exec.Command(config.VirtiofsdBinPath,
"--socket-path="+socket,
"-o", fmt.Sprintf("source=%s", source))
cmd.Stdout = os.Stdout
cmd.Stderr = os.Stderr
if err := cmd.Start(); err != nil {
return fmt.Errorf("virtiofs server cannot start: %v", err)
}
args = append(args, "-chardev", fmt.Sprintf("socket,id=char%d,path=%s", index, socket))
args = append(args, "-device",
fmt.Sprintf("vhost-user-fs-pci,chardev=char%d,tag=virtiofs%d", index, index))
}
qemuCmd := exec.Command(config.QemuBinPath, args...)
// If verbosity is enabled print out the full path/arguments
log.Debugf("%v\n", qemuCmd.Args)
@ -589,7 +625,7 @@ func buildQemuCmdline(config QemuConfig) (QemuConfig, []string) {
return config, qemuArgs
}
func discoverBinaries(config QemuConfig) (QemuConfig, error) {
func discoverQemu(config QemuConfig) (QemuConfig, error) {
if config.QemuImgPath != "" {
return config, nil
}
@ -611,6 +647,16 @@ func discoverBinaries(config QemuConfig) (QemuConfig, error) {
return config, nil
}
func discoverVirtiofsd(config QemuConfig) (QemuConfig, error) {
if config.VirtiofsdBinPath != "" {
return config, nil
}
virtiofsdPath := filepath.Dir(config.QemuBinPath)
config.VirtiofsdBinPath = filepath.Join(virtiofsdPath, "..", "lib", "qemu", "virtiofsd")
return config, nil
}
func buildQemuForwardings(publishFlags multipleFlag) (string, error) {
if len(publishFlags) == 0 {
return "", nil