| // Copyright 2017 The Chromium OS Authors. All rights reserved. |
| // Use of this source code is governed by a BSD-style license that can be |
| // found in the LICENSE file. |
| |
| use std; |
| use std::cmp::min; |
| use std::error; |
| use std::ffi::CStr; |
| use std::fmt; |
| use std::fs::{File, OpenOptions}; |
| use std::io::{self, stdin, Read}; |
| use std::mem; |
| use std::os::unix::io::{FromRawFd, RawFd}; |
| use std::os::unix::net::UnixStream; |
| use std::path::{Path, PathBuf}; |
| use std::str; |
| use std::sync::{Arc, Barrier}; |
| use std::thread; |
| use std::thread::JoinHandle; |
| use std::time::{Duration, SystemTime, UNIX_EPOCH}; |
| |
| use libc::{self, c_int}; |
| |
| use audio_streams::DummyStreamSource; |
| use byteorder::{ByteOrder, LittleEndian}; |
| use devices::{self, PciDevice, VirtioPciDevice}; |
| use io_jail::{self, Minijail}; |
| use kvm::*; |
| use libcras::CrasClient; |
| use msg_socket::{MsgError, MsgReceiver, MsgSender, MsgSocket}; |
| use net_util::{Error as NetError, Tap}; |
| use qcow::{self, ImageType, QcowFile}; |
| use rand_ish::SimpleRng; |
| use sync::{Condvar, Mutex}; |
| use sys_util::net::{UnixSeqpacket, UnixSeqpacketListener, UnlinkUnixSeqpacketListener}; |
| use sys_util::{ |
| self, block_signal, clear_signal, flock, get_blocked_signals, get_group_id, get_user_id, |
| getegid, geteuid, register_signal_handler, validate_raw_fd, EventFd, FlockOperation, |
| GuestMemory, Killable, PollContext, PollToken, SignalFd, Terminal, TimerFd, SIGRTMIN, |
| }; |
| use vhost; |
| use vm_control::{VmRequest, VmResponse, VmRunMode}; |
| |
| use Config; |
| |
| use arch::{self, LinuxArch, RunnableLinuxVm, VirtioDeviceStub, VmComponents}; |
| |
| #[cfg(any(target_arch = "arm", target_arch = "aarch64"))] |
| use aarch64::AArch64 as Arch; |
| #[cfg(any(target_arch = "x86", target_arch = "x86_64"))] |
| use x86_64::X8664arch as Arch; |
| |
| #[derive(Debug)] |
| pub enum Error { |
| BalloonDeviceNew(devices::virtio::BalloonError), |
| BlockDeviceNew(sys_util::Error), |
| BlockSignal(sys_util::signal::Error), |
| BuildingVm(Box<error::Error>), |
| CloneEventFd(sys_util::Error), |
| CreateEventFd(sys_util::Error), |
| CreatePollContext(sys_util::Error), |
| CreateSignalFd(sys_util::SignalFdError), |
| CreateSocket(io::Error), |
| CreateTapDevice(NetError), |
| CreateTimerFd(sys_util::Error), |
| DetectImageType(qcow::Error), |
| DeviceJail(io_jail::Error), |
| DevicePivotRoot(io_jail::Error), |
| Disk(io::Error), |
| DiskImageLock(sys_util::Error), |
| InvalidFdPath, |
| InvalidWaylandPath, |
| NetDeviceNew(devices::virtio::NetError), |
| PivotRootDoesntExist(&'static str), |
| OpenAndroidFstab(PathBuf, io::Error), |
| OpenInitrd(PathBuf, io::Error), |
| OpenKernel(PathBuf, io::Error), |
| P9DeviceNew(devices::virtio::P9Error), |
| PollContextAdd(sys_util::Error), |
| PollContextDelete(sys_util::Error), |
| QcowDeviceCreate(qcow::Error), |
| ReadLowmemAvailable(io::Error), |
| ReadLowmemMargin(io::Error), |
| RegisterBalloon(arch::DeviceRegistrationError), |
| RegisterBlock(arch::DeviceRegistrationError), |
| RegisterGpu(arch::DeviceRegistrationError), |
| RegisterNet(arch::DeviceRegistrationError), |
| RegisterP9(arch::DeviceRegistrationError), |
| RegisterRng(arch::DeviceRegistrationError), |
| RegisterSignalHandler(sys_util::Error), |
| RegisterWayland(arch::DeviceRegistrationError), |
| ResetTimerFd(sys_util::Error), |
| RngDeviceNew(devices::virtio::RngError), |
| InputDeviceNew(devices::virtio::InputError), |
| InputEventsOpen(std::io::Error), |
| SettingGidMap(io_jail::Error), |
| SettingUidMap(io_jail::Error), |
| SignalFd(sys_util::SignalFdError), |
| SpawnVcpu(io::Error), |
| TimerFd(sys_util::Error), |
| ValidateRawFd(sys_util::Error), |
| VhostNetDeviceNew(devices::virtio::vhost::Error), |
| VhostVsockDeviceNew(devices::virtio::vhost::Error), |
| VirtioPciDev(sys_util::Error), |
| WaylandDeviceNew(sys_util::Error), |
| LoadKernel(Box<error::Error>), |
| } |
| |
| impl fmt::Display for Error { |
| fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result { |
| match self { |
| Error::BalloonDeviceNew(e) => write!(f, "failed to create balloon: {}", e), |
| Error::BlockDeviceNew(e) => write!(f, "failed to create block device: {}", e), |
| Error::BlockSignal(e) => write!(f, "failed to block signal: {}", e), |
| Error::BuildingVm(e) => write!(f, "The architecture failed to build the vm: {}", e), |
| Error::CloneEventFd(e) => write!(f, "failed to clone eventfd: {}", e), |
| Error::CreateEventFd(e) => write!(f, "failed to create eventfd: {}", e), |
| Error::CreatePollContext(e) => write!(f, "failed to create poll context: {}", e), |
| Error::CreateSignalFd(e) => write!(f, "failed to create signalfd: {}", e), |
| Error::CreateSocket(e) => write!(f, "failed to create socket: {}", e), |
| Error::CreateTapDevice(e) => write!(f, "failed to create tap device: {}", e), |
| Error::CreateTimerFd(e) => write!(f, "failed to create timerfd: {}", e), |
| Error::DetectImageType(e) => write!(f, "failed to detect disk image type: {}", e), |
| Error::DeviceJail(e) => write!(f, "failed to jail device: {}", e), |
| Error::DevicePivotRoot(e) => write!(f, "failed to pivot root device: {}", e), |
| Error::Disk(e) => write!(f, "failed to load disk image: {}", e), |
| Error::DiskImageLock(e) => write!(f, "failed to lock disk image: {}", e), |
| Error::InvalidFdPath => write!(f, "failed parsing a /proc/self/fd/*"), |
| Error::InvalidWaylandPath => { |
| write!(f, "wayland socket path has no parent or file name") |
| } |
| Error::NetDeviceNew(e) => write!(f, "failed to set up virtio networking: {}", e), |
| Error::PivotRootDoesntExist(p) => write!(f, "{} doesn't exist, can't jail devices.", p), |
| Error::OpenInitrd(p, e) => write!(f, "failed to open initrd {}: {}", p.display(), e), |
| Error::OpenKernel(p, e) => { |
| write!(f, "failed to open kernel image {}: {}", p.display(), e) |
| } |
| Error::OpenAndroidFstab(ref p, ref e) => write!( |
| f, |
| "failed to open android fstab file {}: {}", |
| p.display(), |
| e |
| ), |
| Error::P9DeviceNew(e) => write!(f, "failed to create 9p device: {}", e), |
| Error::PollContextAdd(e) => write!(f, "failed to add fd to poll context: {}", e), |
| Error::PollContextDelete(e) => { |
| write!(f, "failed to remove fd from poll context: {}", e) |
| } |
| Error::QcowDeviceCreate(e) => write!(f, "failed to read qcow formatted file {}", e), |
| Error::ReadLowmemAvailable(e) => write!( |
| f, |
| "failed to read /sys/kernel/mm/chromeos-low_mem/available: {}", |
| e |
| ), |
| Error::ReadLowmemMargin(e) => write!( |
| f, |
| "failed to read /sys/kernel/mm/chromeos-low_mem/margin: {}", |
| e |
| ), |
| Error::RegisterBalloon(e) => write!(f, "error registering balloon device: {}", e), |
| Error::RegisterBlock(e) => write!(f, "error registering block device: {}", e), |
| Error::RegisterGpu(e) => write!(f, "error registering gpu device: {}", e), |
| Error::RegisterNet(e) => write!(f, "error registering net device: {}", e), |
| Error::RegisterP9(e) => write!(f, "error registering 9p device: {}", e), |
| Error::RegisterRng(e) => write!(f, "error registering rng device: {}", e), |
| Error::RegisterSignalHandler(e) => write!(f, "error registering signal handler: {}", e), |
| Error::RegisterWayland(e) => write!(f, "error registering wayland device: {}", e), |
| Error::ResetTimerFd(e) => write!(f, "failed to reset timerfd: {}", e), |
| Error::RngDeviceNew(e) => write!(f, "failed to set up rng: {}", e), |
| Error::InputDeviceNew(ref e) => write!(f, "failed to set up input device: {}", e), |
| Error::InputEventsOpen(ref e) => write!(f, "failed to open event device: {}", e), |
| Error::SettingGidMap(e) => write!(f, "error setting GID map: {}", e), |
| Error::SettingUidMap(e) => write!(f, "error setting UID map: {}", e), |
| Error::SignalFd(e) => write!(f, "failed to read signal fd: {}", e), |
| Error::SpawnVcpu(e) => write!(f, "failed to spawn VCPU thread: {}", e), |
| Error::TimerFd(e) => write!(f, "failed to read timer fd: {}", e), |
| Error::ValidateRawFd(e) => write!(f, "failed to validate raw fd: {}", e), |
| Error::VhostNetDeviceNew(e) => write!(f, "failed to set up vhost networking: {}", e), |
| Error::VhostVsockDeviceNew(e) => { |
| write!(f, "failed to set up virtual socket device: {}", e) |
| } |
| Error::VirtioPciDev(e) => write!(f, "failed to create virtio pci dev: {}", e), |
| Error::WaylandDeviceNew(e) => write!(f, "failed to create wayland device: {}", e), |
| Error::LoadKernel(e) => write!(f, "failed to load kernel: {}", e), |
| } |
| } |
| } |
| |
| impl std::error::Error for Error { |
| fn description(&self) -> &str { |
| "Some device failure" |
| } |
| } |
| |
| type Result<T> = std::result::Result<T, Error>; |
| |
| fn create_base_minijail(root: &Path, seccomp_policy: &Path) -> Result<Minijail> { |
| // All child jails run in a new user namespace without any users mapped, |
| // they run as nobody unless otherwise configured. |
| let mut j = Minijail::new().map_err(Error::DeviceJail)?; |
| j.namespace_pids(); |
| j.namespace_user(); |
| j.namespace_user_disable_setgroups(); |
| // Don't need any capabilities. |
| j.use_caps(0); |
| // Create a new mount namespace with an empty root FS. |
| j.namespace_vfs(); |
| j.enter_pivot_root(root).map_err(Error::DevicePivotRoot)?; |
| // Run in an empty network namespace. |
| j.namespace_net(); |
| // Apply the block device seccomp policy. |
| j.no_new_privs(); |
| // Use TSYNC only for the side effect of it using SECCOMP_RET_TRAP, which will correctly kill |
| // the entire device process if a worker thread commits a seccomp violation. |
| j.set_seccomp_filter_tsync(); |
| #[cfg(debug_assertions)] |
| j.log_seccomp_filter_failures(); |
| j.parse_seccomp_filters(seccomp_policy) |
| .map_err(Error::DeviceJail)?; |
| j.use_seccomp_filter(); |
| // Don't do init setup. |
| j.run_as_init(); |
| Ok(j) |
| } |
| |
| fn create_virtio_devs( |
| cfg: Config, |
| mem: &GuestMemory, |
| _exit_evt: &EventFd, |
| wayland_device_socket: UnixSeqpacket, |
| balloon_device_socket: UnixSeqpacket, |
| disk_device_sockets: &mut Vec<UnixSeqpacket>, |
| ) -> std::result::Result<Vec<(Box<PciDevice + 'static>, Option<Minijail>)>, Box<error::Error>> { |
| let default_pivot_root: &str = option_env!("DEFAULT_PIVOT_ROOT").unwrap_or("/var/empty"); |
| |
| let mut devs = Vec::new(); |
| |
| // An empty directory for jailed device's pivot root. |
| let empty_root_path = Path::new(default_pivot_root); |
| if cfg.multiprocess && !empty_root_path.exists() { |
| return Err(Box::new(Error::PivotRootDoesntExist(default_pivot_root))); |
| } |
| |
| for disk in &cfg.disks { |
| let disk_device_socket = disk_device_sockets.remove(0); |
| |
| // Special case '/proc/self/fd/*' paths. The FD is already open, just use it. |
| let mut raw_image: File = if disk.path.parent() == Some(Path::new("/proc/self/fd")) { |
| // Safe because we will validate |raw_fd|. |
| unsafe { File::from_raw_fd(raw_fd_from_path(&disk.path)?) } |
| } else { |
| OpenOptions::new() |
| .read(true) |
| .write(!disk.read_only) |
| .open(&disk.path) |
| .map_err(Error::Disk)? |
| }; |
| // Lock the disk image to prevent other crosvm instances from using it. |
| let lock_op = if disk.read_only { |
| FlockOperation::LockShared |
| } else { |
| FlockOperation::LockExclusive |
| }; |
| flock(&raw_image, lock_op, true).map_err(Error::DiskImageLock)?; |
| |
| let image_type = qcow::detect_image_type(&raw_image).map_err(Error::DetectImageType)?; |
| let block_box: Box<devices::virtio::VirtioDevice> = match image_type { |
| ImageType::Raw => { |
| // Access as a raw block device. |
| Box::new( |
| devices::virtio::Block::new( |
| raw_image, |
| disk.read_only, |
| Some(disk_device_socket), |
| ) |
| .map_err(Error::BlockDeviceNew)?, |
| ) |
| } |
| ImageType::Qcow2 => { |
| // Valid qcow header present |
| let qcow_image = QcowFile::from(raw_image).map_err(Error::QcowDeviceCreate)?; |
| Box::new( |
| devices::virtio::Block::new( |
| qcow_image, |
| disk.read_only, |
| Some(disk_device_socket), |
| ) |
| .map_err(Error::BlockDeviceNew)?, |
| ) |
| } |
| }; |
| let jail = if cfg.multiprocess { |
| let policy_path: PathBuf = cfg.seccomp_policy_dir.join("block_device.policy"); |
| Some(create_base_minijail(empty_root_path, &policy_path)?) |
| } else { |
| None |
| }; |
| |
| devs.push(VirtioDeviceStub { |
| dev: block_box, |
| jail, |
| }); |
| } |
| |
| let rng_box = Box::new(devices::virtio::Rng::new().map_err(Error::RngDeviceNew)?); |
| let rng_jail = if cfg.multiprocess { |
| let policy_path: PathBuf = cfg.seccomp_policy_dir.join("rng_device.policy"); |
| Some(create_base_minijail(empty_root_path, &policy_path)?) |
| } else { |
| None |
| }; |
| devs.push(VirtioDeviceStub { |
| dev: rng_box, |
| jail: rng_jail, |
| }); |
| |
| #[cfg(feature = "tpm")] |
| { |
| if cfg.software_tpm { |
| let tpm_box = Box::new(devices::virtio::Tpm::new()); |
| let tpm_jail = if cfg.multiprocess { |
| let policy_path = cfg.seccomp_policy_dir.join("tpm_device.policy"); |
| Some(create_base_minijail(empty_root_path, &policy_path)?) |
| } else { |
| None |
| }; |
| devs.push(VirtioDeviceStub { |
| dev: tpm_box, |
| jail: tpm_jail, |
| }); |
| } |
| } |
| |
| if let Some(trackpad_spec) = cfg.virtio_trackpad { |
| match create_input_socket(&trackpad_spec.path) { |
| Ok(socket) => { |
| let trackpad_box = Box::new( |
| devices::virtio::new_trackpad( |
| socket, |
| trackpad_spec.width, |
| trackpad_spec.height, |
| ) |
| .map_err(Error::InputDeviceNew)?, |
| ); |
| let trackpad_jail = if cfg.multiprocess { |
| let policy_path: PathBuf = cfg.seccomp_policy_dir.join("input_device.policy"); |
| Some(create_base_minijail(empty_root_path, &policy_path)?) |
| } else { |
| None |
| }; |
| devs.push(VirtioDeviceStub { |
| dev: trackpad_box, |
| jail: trackpad_jail, |
| }); |
| } |
| Err(e) => { |
| error!("failed configuring virtio trackpad: {}", e); |
| return Err(e); |
| } |
| } |
| } |
| |
| if let Some(mouse_socket) = cfg.virtio_mouse { |
| match create_input_socket(&mouse_socket) { |
| Ok(socket) => { |
| let mouse_box = |
| Box::new(devices::virtio::new_mouse(socket).map_err(Error::InputDeviceNew)?); |
| let mouse_jail = if cfg.multiprocess { |
| let policy_path: PathBuf = cfg.seccomp_policy_dir.join("input_device.policy"); |
| Some(create_base_minijail(empty_root_path, &policy_path)?) |
| } else { |
| None |
| }; |
| devs.push(VirtioDeviceStub { |
| dev: mouse_box, |
| jail: mouse_jail, |
| }); |
| } |
| Err(e) => { |
| error!("failed configuring virtio mouse: {}", e); |
| return Err(e); |
| } |
| } |
| } |
| |
| if let Some(keyboard_socket) = cfg.virtio_keyboard { |
| match create_input_socket(&keyboard_socket) { |
| Ok(socket) => { |
| let keyboard_box = |
| Box::new(devices::virtio::new_keyboard(socket).map_err(Error::InputDeviceNew)?); |
| let keyboard_jail = if cfg.multiprocess { |
| let policy_path: PathBuf = cfg.seccomp_policy_dir.join("input_device.policy"); |
| Some(create_base_minijail(empty_root_path, &policy_path)?) |
| } else { |
| None |
| }; |
| devs.push(VirtioDeviceStub { |
| dev: keyboard_box, |
| jail: keyboard_jail, |
| }); |
| } |
| Err(e) => { |
| error!("failed configuring virtio keyboard: {}", e); |
| return Err(e); |
| } |
| } |
| } |
| |
| for dev_path in cfg.virtio_input_evdevs { |
| let dev_file = OpenOptions::new() |
| .read(true) |
| .write(true) |
| .open(dev_path) |
| .map_err(|e| Box::new(e))?; |
| let vinput_box = |
| Box::new(devices::virtio::new_evdev(dev_file).map_err(Error::InputDeviceNew)?); |
| let vinput_jail = if cfg.multiprocess { |
| let policy_path: PathBuf = cfg.seccomp_policy_dir.join("input_device.policy"); |
| Some(create_base_minijail(empty_root_path, &policy_path)?) |
| } else { |
| None |
| }; |
| devs.push(VirtioDeviceStub { |
| dev: vinput_box, |
| jail: vinput_jail, |
| }); |
| } |
| |
| let balloon_box = Box::new( |
| devices::virtio::Balloon::new(balloon_device_socket).map_err(Error::BalloonDeviceNew)?, |
| ); |
| let balloon_jail = if cfg.multiprocess { |
| let policy_path: PathBuf = cfg.seccomp_policy_dir.join("balloon_device.policy"); |
| Some(create_base_minijail(empty_root_path, &policy_path)?) |
| } else { |
| None |
| }; |
| devs.push(VirtioDeviceStub { |
| dev: balloon_box, |
| jail: balloon_jail, |
| }); |
| |
| // We checked above that if the IP is defined, then the netmask is, too. |
| for tap_fd in cfg.tap_fd { |
| // Safe because we ensure that we get a unique handle to the fd. |
| let tap = unsafe { |
| Tap::from_raw_fd(validate_raw_fd(tap_fd).map_err(Error::ValidateRawFd)?) |
| .map_err(Error::CreateTapDevice)? |
| }; |
| let net_box = Box::new(devices::virtio::Net::from(tap).map_err(Error::NetDeviceNew)?); |
| |
| let jail = if cfg.multiprocess { |
| let policy_path: PathBuf = cfg.seccomp_policy_dir.join("net_device.policy"); |
| |
| Some(create_base_minijail(empty_root_path, &policy_path)?) |
| } else { |
| None |
| }; |
| |
| devs.push(VirtioDeviceStub { dev: net_box, jail }); |
| } |
| |
| if let Some(host_ip) = cfg.host_ip { |
| if let Some(netmask) = cfg.netmask { |
| if let Some(mac_address) = cfg.mac_address { |
| let net_box: Box<devices::virtio::VirtioDevice> = if cfg.vhost_net { |
| Box::new( |
| devices::virtio::vhost::Net::<Tap, vhost::Net<Tap>>::new( |
| host_ip, |
| netmask, |
| mac_address, |
| &mem, |
| ) |
| .map_err(Error::VhostNetDeviceNew)?, |
| ) |
| } else { |
| Box::new( |
| devices::virtio::Net::<Tap>::new(host_ip, netmask, mac_address) |
| .map_err(Error::NetDeviceNew)?, |
| ) |
| }; |
| |
| let jail = if cfg.multiprocess { |
| let policy_path: PathBuf = if cfg.vhost_net { |
| cfg.seccomp_policy_dir.join("vhost_net_device.policy") |
| } else { |
| cfg.seccomp_policy_dir.join("net_device.policy") |
| }; |
| |
| Some(create_base_minijail(empty_root_path, &policy_path)?) |
| } else { |
| None |
| }; |
| |
| devs.push(VirtioDeviceStub { dev: net_box, jail }); |
| } |
| } |
| } |
| |
| #[cfg_attr(not(feature = "gpu"), allow(unused_mut))] |
| let mut resource_bridge_wl_socket = |
| None::<devices::virtio::resource_bridge::ResourceRequestSocket>; |
| |
| #[cfg(feature = "gpu")] |
| { |
| if cfg.gpu { |
| if let Some(wayland_socket_path) = cfg.wayland_socket_path.as_ref() { |
| let (wl_socket, gpu_socket) = |
| devices::virtio::resource_bridge::pair().map_err(Error::CreateSocket)?; |
| resource_bridge_wl_socket = Some(wl_socket); |
| |
| let jailed_wayland_path = Path::new("/wayland-0"); |
| |
| let gpu_box = Box::new(devices::virtio::Gpu::new( |
| _exit_evt.try_clone().map_err(Error::CloneEventFd)?, |
| Some(gpu_socket), |
| if cfg.multiprocess { |
| &jailed_wayland_path |
| } else { |
| wayland_socket_path.as_path() |
| }, |
| )); |
| |
| let jail = if cfg.multiprocess { |
| let policy_path: PathBuf = cfg.seccomp_policy_dir.join("gpu_device.policy"); |
| let mut jail = create_base_minijail(empty_root_path, &policy_path)?; |
| |
| // Create a tmpfs in the device's root directory so that we can bind mount the |
| // dri directory into it. The size=67108864 is size=64*1024*1024 or size=64MB. |
| jail.mount_with_data( |
| Path::new("none"), |
| Path::new("/"), |
| "tmpfs", |
| (libc::MS_NOSUID | libc::MS_NODEV | libc::MS_NOEXEC) as usize, |
| "size=67108864", |
| ) |
| .unwrap(); |
| |
| // Device nodes required for DRM. |
| let sys_dev_char_path = Path::new("/sys/dev/char"); |
| jail.mount_bind(sys_dev_char_path, sys_dev_char_path, false) |
| .unwrap(); |
| let sys_devices_path = Path::new("/sys/devices"); |
| jail.mount_bind(sys_devices_path, sys_devices_path, false) |
| .unwrap(); |
| let drm_dri_path = Path::new("/dev/dri"); |
| jail.mount_bind(drm_dri_path, drm_dri_path, false).unwrap(); |
| |
| // Libraries that are required when mesa drivers are dynamically loaded. |
| let lib_path = Path::new("/lib64"); |
| jail.mount_bind(lib_path, lib_path, false).unwrap(); |
| let usr_lib_path = Path::new("/usr/lib64"); |
| jail.mount_bind(usr_lib_path, usr_lib_path, false).unwrap(); |
| |
| // Bind mount the wayland socket into jail's root. This is necessary since each |
| // new wayland context must open() the socket. |
| jail.mount_bind(wayland_socket_path.as_path(), jailed_wayland_path, true) |
| .unwrap(); |
| |
| // Set the uid/gid for the jailed process, and give a basic id map. This |
| // is required for the above bind mount to work. |
| let crosvm_user_group = CStr::from_bytes_with_nul(b"crosvm\0").unwrap(); |
| let crosvm_uid = match get_user_id(&crosvm_user_group) { |
| Ok(u) => u, |
| Err(e) => { |
| warn!("falling back to current user id for gpu: {}", e); |
| geteuid() |
| } |
| }; |
| let crosvm_gid = match get_group_id(&crosvm_user_group) { |
| Ok(u) => u, |
| Err(e) => { |
| warn!("falling back to current group id for gpu: {}", e); |
| getegid() |
| } |
| }; |
| jail.change_uid(crosvm_uid); |
| jail.change_gid(crosvm_gid); |
| jail.uidmap(&format!("{0} {0} 1", crosvm_uid)) |
| .map_err(Error::SettingUidMap)?; |
| jail.gidmap(&format!("{0} {0} 1", crosvm_gid)) |
| .map_err(Error::SettingGidMap)?; |
| |
| Some(jail) |
| } else { |
| None |
| }; |
| devs.push(VirtioDeviceStub { dev: gpu_box, jail }); |
| } |
| } |
| } |
| |
| if let Some(wayland_socket_path) = cfg.wayland_socket_path.as_ref() { |
| let wayland_socket_dir = wayland_socket_path |
| .parent() |
| .ok_or(Error::InvalidWaylandPath)?; |
| let wayland_socket_name = wayland_socket_path |
| .file_name() |
| .ok_or(Error::InvalidWaylandPath)?; |
| let jailed_wayland_dir = Path::new("/wayland"); |
| let jailed_wayland_path = jailed_wayland_dir.join(wayland_socket_name); |
| |
| let wl_box = Box::new( |
| devices::virtio::Wl::new( |
| if cfg.multiprocess { |
| &jailed_wayland_path |
| } else { |
| wayland_socket_path.as_path() |
| }, |
| wayland_device_socket, |
| resource_bridge_wl_socket, |
| ) |
| .map_err(Error::WaylandDeviceNew)?, |
| ); |
| |
| let jail = if cfg.multiprocess { |
| let policy_path: PathBuf = cfg.seccomp_policy_dir.join("wl_device.policy"); |
| let mut jail = create_base_minijail(empty_root_path, &policy_path)?; |
| |
| // Create a tmpfs in the device's root directory so that we can bind mount the wayland |
| // socket directory into it. The size=67108864 is size=64*1024*1024 or size=64MB. |
| jail.mount_with_data( |
| Path::new("none"), |
| Path::new("/"), |
| "tmpfs", |
| (libc::MS_NOSUID | libc::MS_NODEV | libc::MS_NOEXEC) as usize, |
| "size=67108864", |
| ) |
| .unwrap(); |
| |
| // Bind mount the wayland socket's directory into jail's root. This is necessary since |
| // each new wayland context must open() the socket. If the wayland socket is ever |
| // destroyed and remade in the same host directory, new connections will be possible |
| // without restarting the wayland device. |
| jail.mount_bind(wayland_socket_dir, jailed_wayland_dir, true) |
| .unwrap(); |
| |
| // Set the uid/gid for the jailed process, and give a basic id map. This |
| // is required for the above bind mount to work. |
| let crosvm_user_group = CStr::from_bytes_with_nul(b"crosvm\0").unwrap(); |
| let crosvm_uid = match get_user_id(&crosvm_user_group) { |
| Ok(u) => u, |
| Err(e) => { |
| warn!("falling back to current user id for Wayland: {}", e); |
| geteuid() |
| } |
| }; |
| let crosvm_gid = match get_group_id(&crosvm_user_group) { |
| Ok(u) => u, |
| Err(e) => { |
| warn!("falling back to current group id for Wayland: {}", e); |
| getegid() |
| } |
| }; |
| jail.change_uid(crosvm_uid); |
| jail.change_gid(crosvm_gid); |
| jail.uidmap(&format!("{0} {0} 1", crosvm_uid)) |
| .map_err(Error::SettingUidMap)?; |
| jail.gidmap(&format!("{0} {0} 1", crosvm_gid)) |
| .map_err(Error::SettingGidMap)?; |
| |
| Some(jail) |
| } else { |
| None |
| }; |
| devs.push(VirtioDeviceStub { dev: wl_box, jail }); |
| } |
| |
| if let Some(cid) = cfg.cid { |
| let vsock_box = Box::new( |
| devices::virtio::vhost::Vsock::new(cid, &mem).map_err(Error::VhostVsockDeviceNew)?, |
| ); |
| |
| let jail = if cfg.multiprocess { |
| let policy_path: PathBuf = cfg.seccomp_policy_dir.join("vhost_vsock_device.policy"); |
| |
| Some(create_base_minijail(empty_root_path, &policy_path)?) |
| } else { |
| None |
| }; |
| |
| devs.push(VirtioDeviceStub { |
| dev: vsock_box, |
| jail, |
| }); |
| } |
| |
| let chronos_user_group = CStr::from_bytes_with_nul(b"chronos\0").unwrap(); |
| let chronos_uid = match get_user_id(&chronos_user_group) { |
| Ok(u) => u, |
| Err(e) => { |
| warn!("falling back to current user id for 9p: {}", e); |
| geteuid() |
| } |
| }; |
| let chronos_gid = match get_group_id(&chronos_user_group) { |
| Ok(u) => u, |
| Err(e) => { |
| warn!("falling back to current group id for 9p: {}", e); |
| getegid() |
| } |
| }; |
| |
| for &(ref src, ref tag) in &cfg.shared_dirs { |
| let (jail, root) = if cfg.multiprocess { |
| let policy_path: PathBuf = cfg.seccomp_policy_dir.join("9p_device.policy"); |
| let mut jail = create_base_minijail(empty_root_path, &policy_path)?; |
| |
| // The shared directory becomes the root of the device's file system. |
| let root = Path::new("/"); |
| jail.mount_bind(&src, root, true).unwrap(); |
| |
| // Set the uid/gid for the jailed process, and give a basic id map. This |
| // is required for the above bind mount to work. |
| jail.change_uid(chronos_uid); |
| jail.change_gid(chronos_gid); |
| jail.uidmap(&format!("{0} {0} 1", chronos_uid)) |
| .map_err(Error::SettingUidMap)?; |
| jail.gidmap(&format!("{0} {0} 1", chronos_gid)) |
| .map_err(Error::SettingGidMap)?; |
| |
| (Some(jail), root) |
| } else { |
| // There's no bind mount so we tell the server to treat the source directory as the |
| // root. The double deref here converts |src| from a &PathBuf into a &Path. |
| (None, &**src) |
| }; |
| |
| let p9_box = Box::new(devices::virtio::P9::new(root, tag).map_err(Error::P9DeviceNew)?); |
| |
| devs.push(VirtioDeviceStub { dev: p9_box, jail }); |
| } |
| |
| let mut pci_devices: Vec<(Box<PciDevice + 'static>, Option<Minijail>)> = Vec::new(); |
| for stub in devs { |
| let pci_dev = |
| Box::new(VirtioPciDevice::new((*mem).clone(), stub.dev).map_err(Error::VirtioPciDev)?); |
| pci_devices.push((pci_dev, stub.jail)); |
| } |
| |
| if cfg.cras_audio { |
| let cras_audio_box = Box::new(devices::Ac97Dev::new( |
| (*mem).clone(), |
| Box::new(CrasClient::new()?), |
| )); |
| let cras_audio_jail = if cfg.multiprocess { |
| let policy_path: PathBuf = cfg.seccomp_policy_dir.join("cras_audio_device.policy"); |
| Some(create_base_minijail(empty_root_path, &policy_path)?) |
| } else { |
| None |
| }; |
| pci_devices.push((cras_audio_box, cras_audio_jail)); |
| } |
| |
| if cfg.null_audio { |
| let null_audio_box = Box::new(devices::Ac97Dev::new( |
| (*mem).clone(), |
| Box::new(DummyStreamSource::new()), |
| )); |
| let null_audio_jail = if cfg.multiprocess { |
| let policy_path: PathBuf = cfg.seccomp_policy_dir.join("null_audio_device.policy"); |
| Some(create_base_minijail(empty_root_path, &policy_path)?) |
| } else { |
| None |
| }; |
| pci_devices.push((null_audio_box, null_audio_jail)); |
| } |
| |
| Ok(pci_devices) |
| } |
| |
| fn raw_fd_from_path(path: &PathBuf) -> std::result::Result<RawFd, Box<Error>> { |
| if !path.is_file() { |
| return Err(Box::new(Error::InvalidFdPath)); |
| } |
| let raw_fd = path |
| .file_name() |
| .and_then(|fd_osstr| fd_osstr.to_str()) |
| .and_then(|fd_str| fd_str.parse::<c_int>().ok()) |
| .ok_or(Error::InvalidFdPath)?; |
| validate_raw_fd(raw_fd).map_err(|e| Box::new(Error::ValidateRawFd(e))) |
| } |
| |
| fn create_input_socket(path: &PathBuf) -> std::result::Result<UnixStream, Box<Error>> { |
| if path.parent() == Some(Path::new("/proc/self/fd")) { |
| // Safe because we will validate |raw_fd|. |
| unsafe { Ok(UnixStream::from_raw_fd(raw_fd_from_path(path)?)) } |
| } else { |
| match UnixStream::connect(path) { |
| Ok(us) => return Ok(us), |
| Err(e) => { |
| return Err(Box::new(Error::InputEventsOpen(e))); |
| } |
| } |
| } |
| } |
| |
| fn setup_vcpu_signal_handler() -> Result<()> { |
| unsafe { |
| extern "C" fn handle_signal() {} |
| // Our signal handler does nothing and is trivially async signal safe. |
| register_signal_handler(SIGRTMIN() + 0, handle_signal) |
| .map_err(Error::RegisterSignalHandler)?; |
| } |
| block_signal(SIGRTMIN() + 0).map_err(Error::BlockSignal)?; |
| Ok(()) |
| } |
| |
| #[derive(Default)] |
| struct VcpuRunMode { |
| mtx: Mutex<VmRunMode>, |
| cvar: Condvar, |
| } |
| |
| impl VcpuRunMode { |
| fn set_and_notify(&self, new_mode: VmRunMode) { |
| *self.mtx.lock() = new_mode; |
| self.cvar.notify_all(); |
| } |
| } |
| |
| fn run_vcpu( |
| vcpu: Vcpu, |
| cpu_id: u32, |
| start_barrier: Arc<Barrier>, |
| io_bus: devices::Bus, |
| mmio_bus: devices::Bus, |
| exit_evt: EventFd, |
| requires_kvmclock_ctrl: bool, |
| run_mode_arc: Arc<VcpuRunMode>, |
| ) -> Result<JoinHandle<()>> { |
| thread::Builder::new() |
| .name(format!("crosvm_vcpu{}", cpu_id)) |
| .spawn(move || { |
| let mut sig_ok = true; |
| match get_blocked_signals() { |
| Ok(mut v) => { |
| v.retain(|&x| x != SIGRTMIN() + 0); |
| if let Err(e) = vcpu.set_signal_mask(&v) { |
| error!( |
| "Failed to set the KVM_SIGNAL_MASK for vcpu {} : {}", |
| cpu_id, e |
| ); |
| sig_ok = false; |
| } |
| } |
| Err(e) => { |
| error!( |
| "Failed to retrieve signal mask for vcpu {} : {}", |
| cpu_id, e |
| ); |
| sig_ok = false; |
| } |
| }; |
| |
| start_barrier.wait(); |
| |
| if sig_ok { |
| 'vcpu_loop: loop { |
| let mut interrupted_by_signal = false; |
| match vcpu.run() { |
| Ok(VcpuExit::IoIn { port, mut size }) => { |
| let mut data = [0; 8]; |
| if size > data.len() { |
| error!("unsupported IoIn size of {} bytes", size); |
| size = data.len(); |
| } |
| io_bus.read(port as u64, &mut data[..size]); |
| if let Err(e) = vcpu.set_data(&data[..size]) { |
| error!("failed to set return data for IoIn: {}", e); |
| } |
| } |
| Ok(VcpuExit::IoOut { |
| port, |
| mut size, |
| data, |
| }) => { |
| if size > data.len() { |
| error!("unsupported IoOut size of {} bytes", size); |
| size = data.len(); |
| } |
| io_bus.write(port as u64, &data[..size]); |
| } |
| Ok(VcpuExit::MmioRead { address, size }) => { |
| let mut data = [0; 8]; |
| mmio_bus.read(address, &mut data[..size]); |
| // Setting data for mmio can not fail. |
| let _ = vcpu.set_data(&data[..size]); |
| } |
| Ok(VcpuExit::MmioWrite { |
| address, |
| size, |
| data, |
| }) => { |
| mmio_bus.write(address, &data[..size]); |
| } |
| Ok(VcpuExit::Hlt) => break, |
| Ok(VcpuExit::Shutdown) => break, |
| Ok(VcpuExit::SystemEvent(_, _)) => break, |
| Ok(r) => warn!("unexpected vcpu exit: {:?}", r), |
| Err(e) => match e.errno() { |
| libc::EINTR => interrupted_by_signal = true, |
| libc::EAGAIN => {} |
| _ => { |
| error!("vcpu hit unknown error: {}", e); |
| break; |
| } |
| }, |
| } |
| |
| if interrupted_by_signal { |
| // Try to clear the signal that we use to kick VCPU if it is pending before |
| // attempting to handle pause requests. |
| if let Err(e) = clear_signal(SIGRTMIN() + 0) { |
| error!("failed to clear pending signal: {}", e); |
| break; |
| } |
| let mut run_mode_lock = run_mode_arc.mtx.lock(); |
| loop { |
| match *run_mode_lock { |
| VmRunMode::Running => break, |
| VmRunMode::Suspending => { |
| // On KVM implementations that use a paravirtualized clock (e.g. |
| // x86), a flag must be set to indicate to the guest kernel that |
| // a VCPU was suspended. The guest kernel will use this flag to |
| // prevent the soft lockup detection from triggering when this |
| // VCPU resumes, which could happen days later in realtime. |
| if requires_kvmclock_ctrl { |
| if let Err(e) = vcpu.kvmclock_ctrl() { |
| error!("failed to signal to kvm that vcpu {} is being suspended: {}", cpu_id, e); |
| } |
| } |
| } |
| VmRunMode::Exiting => break 'vcpu_loop, |
| } |
| // Give ownership of our exclusive lock to the condition variable that |
| // will block. When the condition variable is notified, `wait` will |
| // unblock and return a new exclusive lock. |
| run_mode_lock = run_mode_arc.cvar.wait(run_mode_lock); |
| } |
| } |
| } |
| } |
| exit_evt |
| .write(1) |
| .expect("failed to signal vcpu exit eventfd"); |
| }) |
| .map_err(Error::SpawnVcpu) |
| } |
| |
| // Reads the contents of a file and converts them into a u64. |
| fn file_to_u64<P: AsRef<Path>>(path: P) -> io::Result<u64> { |
| let mut file = File::open(path)?; |
| |
| let mut buf = [0u8; 32]; |
| let count = file.read(&mut buf)?; |
| |
| let content = |
| str::from_utf8(&buf[..count]).map_err(|e| io::Error::new(io::ErrorKind::InvalidData, e))?; |
| content |
| .trim() |
| .parse() |
| .map_err(|e| io::Error::new(io::ErrorKind::InvalidData, e)) |
| } |
| |
| pub fn run_config(cfg: Config) -> Result<()> { |
| if cfg.multiprocess { |
| // Printing something to the syslog before entering minijail so that libc's syslogger has a |
| // chance to open files necessary for its operation, like `/etc/localtime`. After jailing, |
| // access to those files will not be possible. |
| info!("crosvm entering multiprocess mode"); |
| } |
| |
| // Masking signals is inherently dangerous, since this can persist across clones/execs. Do this |
| // before any jailed devices have been spawned, so that we can catch any of them that fail very |
| // quickly. |
| let sigchld_fd = SignalFd::new(libc::SIGCHLD).map_err(Error::CreateSignalFd)?; |
| |
| let initrd_image = if let Some(ref initrd_path) = cfg.initrd_path { |
| Some( |
| File::open(initrd_path.as_path()) |
| .map_err(|e| Error::OpenInitrd(initrd_path.clone(), e))?, |
| ) |
| } else { |
| None |
| }; |
| |
| let components = VmComponents { |
| memory_mb: (cfg.memory.unwrap_or(256) << 20) as u64, |
| vcpu_count: cfg.vcpu_count.unwrap_or(1), |
| kernel_image: File::open(cfg.kernel_path.as_path()) |
| .map_err(|e| Error::OpenKernel(cfg.kernel_path.clone(), e))?, |
| android_fstab: cfg |
| .android_fstab |
| .as_ref() |
| .map(|x| { |
| File::open(x.as_path()).map_err(|e| Error::OpenAndroidFstab(x.to_path_buf(), e)) |
| }) |
| .map_or(Ok(None), |v| v.map(Some))?, |
| initrd_image, |
| extra_kernel_params: cfg.params.clone(), |
| wayland_dmabuf: cfg.wayland_dmabuf, |
| }; |
| |
| let control_server_socket = match &cfg.socket_path { |
| Some(path) => Some(UnlinkUnixSeqpacketListener( |
| UnixSeqpacketListener::bind(path).map_err(Error::CreateSocket)?, |
| )), |
| None => None, |
| }; |
| |
| let mut control_sockets = Vec::new(); |
| let (wayland_host_socket, wayland_device_socket) = |
| UnixSeqpacket::pair().map_err(Error::CreateSocket)?; |
| control_sockets.push(MsgSocket::<VmResponse, VmRequest>::new(wayland_host_socket)); |
| // Balloon gets a special socket so balloon requests can be forwarded from the main process. |
| let (balloon_host_socket, balloon_device_socket) = |
| UnixSeqpacket::pair().map_err(Error::CreateSocket)?; |
| |
| // Create one control socket per disk. |
| let mut disk_device_sockets = Vec::new(); |
| let mut disk_host_sockets = Vec::new(); |
| let disk_count = cfg.disks.len(); |
| for _ in 0..disk_count { |
| let (disk_host_socket, disk_device_socket) = |
| UnixSeqpacket::pair().map_err(Error::CreateSocket)?; |
| disk_device_sockets.push(disk_device_socket); |
| let disk_host_socket = MsgSocket::<VmRequest, VmResponse>::new(disk_host_socket); |
| disk_host_sockets.push(disk_host_socket); |
| } |
| |
| let linux = Arch::build_vm(components, cfg.split_irqchip, |m, e| { |
| create_virtio_devs( |
| cfg, |
| m, |
| e, |
| wayland_device_socket, |
| balloon_device_socket, |
| &mut disk_device_sockets, |
| ) |
| }) |
| .map_err(Error::BuildingVm)?; |
| run_control( |
| linux, |
| control_server_socket, |
| control_sockets, |
| balloon_host_socket, |
| &disk_host_sockets, |
| sigchld_fd, |
| ) |
| } |
| |
| fn run_control( |
| mut linux: RunnableLinuxVm, |
| control_server_socket: Option<UnlinkUnixSeqpacketListener>, |
| mut control_sockets: Vec<MsgSocket<VmResponse, VmRequest>>, |
| balloon_host_socket: UnixSeqpacket, |
| disk_host_sockets: &[MsgSocket<VmRequest, VmResponse>], |
| sigchld_fd: SignalFd, |
| ) -> Result<()> { |
| // Paths to get the currently available memory and the low memory threshold. |
| const LOWMEM_MARGIN: &str = "/sys/kernel/mm/chromeos-low_mem/margin"; |
| const LOWMEM_AVAILABLE: &str = "/sys/kernel/mm/chromeos-low_mem/available"; |
| |
| // The amount of additional memory to claim back from the VM whenever the system is |
| // low on memory. |
| const ONE_GB: u64 = (1 << 30); |
| |
| let max_balloon_memory = match linux.vm.get_memory().memory_size() { |
| // If the VM has at least 1.5 GB, the balloon driver can consume all but the last 1 GB. |
| n if n >= (ONE_GB / 2) * 3 => n - ONE_GB, |
| // Otherwise, if the VM has at least 500MB the balloon driver will consume at most |
| // half of it. |
| n if n >= (ONE_GB / 2) => n / 2, |
| // Otherwise, the VM is too small for us to take memory away from it. |
| _ => 0, |
| }; |
| let mut current_balloon_memory: u64 = 0; |
| let balloon_memory_increment: u64 = max_balloon_memory / 16; |
| |
| #[derive(PollToken)] |
| enum Token { |
| Exit, |
| Stdin, |
| ChildSignal, |
| CheckAvailableMemory, |
| LowMemory, |
| LowmemTimer, |
| VmControlServer, |
| VmControl { index: usize }, |
| } |
| |
| let stdin_handle = stdin(); |
| let stdin_lock = stdin_handle.lock(); |
| stdin_lock |
| .set_raw_mode() |
| .expect("failed to set terminal raw mode"); |
| |
| let poll_ctx = PollContext::new().map_err(Error::CreatePollContext)?; |
| poll_ctx |
| .add(&linux.exit_evt, Token::Exit) |
| .map_err(Error::PollContextAdd)?; |
| if let Err(e) = poll_ctx.add(&stdin_handle, Token::Stdin) { |
| warn!("failed to add stdin to poll context: {}", e); |
| } |
| poll_ctx |
| .add(&sigchld_fd, Token::ChildSignal) |
| .map_err(Error::PollContextAdd)?; |
| |
| if let Some(socket_server) = &control_server_socket { |
| poll_ctx |
| .add(socket_server, Token::VmControlServer) |
| .map_err(Error::PollContextAdd)?; |
| } |
| for (index, socket) in control_sockets.iter().enumerate() { |
| poll_ctx |
| .add(socket.as_ref(), Token::VmControl { index }) |
| .map_err(Error::PollContextAdd)?; |
| } |
| |
| // Watch for low memory notifications and take memory back from the VM. |
| let low_mem = File::open("/dev/chromeos-low-mem").ok(); |
| if let Some(ref low_mem) = low_mem { |
| poll_ctx |
| .add(low_mem, Token::LowMemory) |
| .map_err(Error::PollContextAdd)?; |
| } else { |
| warn!("Unable to open low mem indicator, maybe not a chrome os kernel"); |
| } |
| |
| // Used to rate limit balloon requests. |
| let mut lowmem_timer = TimerFd::new().map_err(Error::CreateTimerFd)?; |
| poll_ctx |
| .add(&lowmem_timer, Token::LowmemTimer) |
| .map_err(Error::PollContextAdd)?; |
| |
| // Used to check whether it's ok to start giving memory back to the VM. |
| let mut freemem_timer = TimerFd::new().map_err(Error::CreateTimerFd)?; |
| poll_ctx |
| .add(&freemem_timer, Token::CheckAvailableMemory) |
| .map_err(Error::PollContextAdd)?; |
| |
| // Used to add jitter to timer values so that we don't have a thundering herd problem when |
| // multiple VMs are running. |
| let mut simple_rng = SimpleRng::new( |
| SystemTime::now() |
| .duration_since(UNIX_EPOCH) |
| .expect("time went backwards") |
| .subsec_nanos() as u64, |
| ); |
| |
| let mut vcpu_handles = Vec::with_capacity(linux.vcpus.len()); |
| let vcpu_thread_barrier = Arc::new(Barrier::new(linux.vcpus.len() + 1)); |
| let run_mode_arc = Arc::new(VcpuRunMode::default()); |
| setup_vcpu_signal_handler()?; |
| for (cpu_id, vcpu) in linux.vcpus.into_iter().enumerate() { |
| let handle = run_vcpu( |
| vcpu, |
| cpu_id as u32, |
| vcpu_thread_barrier.clone(), |
| linux.io_bus.clone(), |
| linux.mmio_bus.clone(), |
| linux.exit_evt.try_clone().map_err(Error::CloneEventFd)?, |
| linux.vm.check_extension(Cap::KvmclockCtrl), |
| run_mode_arc.clone(), |
| )?; |
| vcpu_handles.push(handle); |
| } |
| vcpu_thread_barrier.wait(); |
| |
| 'poll: loop { |
| let events = { |
| match poll_ctx.wait() { |
| Ok(v) => v, |
| Err(e) => { |
| error!("failed to poll: {}", e); |
| break; |
| } |
| } |
| }; |
| |
| let mut vm_control_indices_to_remove = Vec::new(); |
| for event in events.iter_readable() { |
| match event.token() { |
| Token::Exit => { |
| info!("vcpu requested shutdown"); |
| break 'poll; |
| } |
| Token::Stdin => { |
| let mut out = [0u8; 64]; |
| match stdin_lock.read_raw(&mut out[..]) { |
| Ok(0) => { |
| // Zero-length read indicates EOF. Remove from pollables. |
| let _ = poll_ctx.delete(&stdin_handle); |
| } |
| Err(e) => { |
| warn!("error while reading stdin: {}", e); |
| let _ = poll_ctx.delete(&stdin_handle); |
| } |
| Ok(count) => { |
| linux |
| .stdio_serial |
| .lock() |
| .queue_input_bytes(&out[..count]) |
| .expect("failed to queue bytes into serial port"); |
| } |
| } |
| } |
| Token::ChildSignal => { |
| // Print all available siginfo structs, then exit the loop. |
| while let Some(siginfo) = sigchld_fd.read().map_err(Error::SignalFd)? { |
| let pid = siginfo.ssi_pid; |
| let pid_label = match linux.pid_debug_label_map.get(&pid) { |
| Some(label) => format!("{} (pid {})", label, pid), |
| None => format!("pid {}", pid), |
| }; |
| error!( |
| "child {} died: signo {}, status {}, code {}", |
| pid_label, siginfo.ssi_signo, siginfo.ssi_status, siginfo.ssi_code |
| ); |
| } |
| break 'poll; |
| } |
| Token::CheckAvailableMemory => { |
| // Acknowledge the timer. |
| freemem_timer.wait().map_err(Error::TimerFd)?; |
| if current_balloon_memory == 0 { |
| // Nothing to see here. |
| if let Err(e) = freemem_timer.clear() { |
| warn!("unable to clear available memory check timer: {}", e); |
| } |
| continue; |
| } |
| |
| // Otherwise see if we can free up some memory. |
| let margin = file_to_u64(LOWMEM_MARGIN).map_err(Error::ReadLowmemMargin)?; |
| let available = |
| file_to_u64(LOWMEM_AVAILABLE).map_err(Error::ReadLowmemAvailable)?; |
| |
| // `available` and `margin` are specified in MB while `balloon_memory_increment` is in |
| // bytes. So to correctly compare them we need to turn the increment value into MB. |
| if available >= margin + 2 * (balloon_memory_increment >> 20) { |
| current_balloon_memory = |
| if current_balloon_memory >= balloon_memory_increment { |
| current_balloon_memory - balloon_memory_increment |
| } else { |
| 0 |
| }; |
| let mut buf = [0u8; mem::size_of::<u64>()]; |
| LittleEndian::write_u64(&mut buf, current_balloon_memory); |
| if let Err(e) = balloon_host_socket.send(&buf) { |
| warn!("failed to send memory value to balloon device: {}", e); |
| } |
| } |
| } |
| Token::LowMemory => { |
| if let Some(ref low_mem) = low_mem { |
| let old_balloon_memory = current_balloon_memory; |
| current_balloon_memory = min( |
| current_balloon_memory + balloon_memory_increment, |
| max_balloon_memory, |
| ); |
| if current_balloon_memory != old_balloon_memory { |
| let mut buf = [0u8; mem::size_of::<u64>()]; |
| LittleEndian::write_u64(&mut buf, current_balloon_memory); |
| if let Err(e) = balloon_host_socket.send(&buf) { |
| warn!("failed to send memory value to balloon device: {}", e); |
| } |
| } |
| |
| // Stop polling the lowmem device until the timer fires. |
| poll_ctx.delete(low_mem).map_err(Error::PollContextDelete)?; |
| |
| // Add some jitter to the timer so that if there are multiple VMs running |
| // they don't all start ballooning at exactly the same time. |
| let lowmem_dur = Duration::from_millis(1000 + simple_rng.rng() % 200); |
| lowmem_timer |
| .reset(lowmem_dur, None) |
| .map_err(Error::ResetTimerFd)?; |
| |
| // Also start a timer to check when we can start giving memory back. Do the |
| // first check after a minute (with jitter) and subsequent checks after |
| // every 30 seconds (with jitter). |
| let freemem_dur = Duration::from_secs(60 + simple_rng.rng() % 12); |
| let freemem_int = Duration::from_secs(30 + simple_rng.rng() % 6); |
| freemem_timer |
| .reset(freemem_dur, Some(freemem_int)) |
| .map_err(Error::ResetTimerFd)?; |
| } |
| } |
| Token::LowmemTimer => { |
| // Acknowledge the timer. |
| lowmem_timer.wait().map_err(Error::TimerFd)?; |
| |
| if let Some(ref low_mem) = low_mem { |
| // Start polling the lowmem device again. |
| poll_ctx |
| .add(low_mem, Token::LowMemory) |
| .map_err(Error::PollContextAdd)?; |
| } |
| } |
| Token::VmControlServer => { |
| if let Some(socket_server) = &control_server_socket { |
| match socket_server.accept() { |
| Ok(socket) => { |
| poll_ctx |
| .add( |
| &socket, |
| Token::VmControl { |
| index: control_sockets.len(), |
| }, |
| ) |
| .map_err(Error::PollContextAdd)?; |
| control_sockets.push(MsgSocket::new(socket)); |
| } |
| Err(e) => error!("failed to accept socket: {}", e), |
| } |
| } |
| } |
| Token::VmControl { index } => { |
| if let Some(socket) = control_sockets.get(index) { |
| match socket.recv() { |
| Ok(request) => { |
| let mut run_mode_opt = None; |
| let response = request.execute( |
| &mut linux.vm, |
| &mut linux.resources, |
| &mut run_mode_opt, |
| &balloon_host_socket, |
| disk_host_sockets, |
| ); |
| if let Err(e) = socket.send(&response) { |
| error!("failed to send VmResponse: {}", e); |
| } |
| if let Some(run_mode) = run_mode_opt { |
| info!("control socket changed run mode to {}", run_mode); |
| match run_mode { |
| VmRunMode::Exiting => { |
| break 'poll; |
| } |
| other => { |
| run_mode_arc.set_and_notify(other); |
| for handle in &vcpu_handles { |
| let _ = handle.kill(SIGRTMIN() + 0); |
| } |
| } |
| } |
| } |
| } |
| Err(e) => { |
| if let MsgError::BadRecvSize { actual: 0, .. } = e { |
| vm_control_indices_to_remove.push(index); |
| } else { |
| error!("failed to recv VmRequest: {}", e); |
| } |
| } |
| } |
| } |
| } |
| } |
| } |
| |
| for event in events.iter_hungup() { |
| match event.token() { |
| Token::Exit => {} |
| Token::Stdin => { |
| let _ = poll_ctx.delete(&stdin_handle); |
| } |
| Token::ChildSignal => {} |
| Token::CheckAvailableMemory => {} |
| Token::LowMemory => {} |
| Token::LowmemTimer => {} |
| Token::VmControlServer => {} |
| Token::VmControl { index } => { |
| // It's possible more data is readable and buffered while the socket is hungup, |
| // so don't delete the socket from the poll context until we're sure all the |
| // data is read. |
| match control_sockets.get(index).map(|s| s.get_readable_bytes()) { |
| Some(Ok(0)) | Some(Err(_)) => vm_control_indices_to_remove.push(index), |
| Some(Ok(x)) => info!("control index {} has {} bytes readable", index, x), |
| _ => {} |
| } |
| } |
| } |
| } |
| |
| // Sort in reverse so the highest indexes are removed first. This removal algorithm |
| // preserved correct indexes as each element is removed. |
| vm_control_indices_to_remove.sort_unstable_by(|a, b| b.cmp(a)); |
| vm_control_indices_to_remove.dedup(); |
| for index in vm_control_indices_to_remove { |
| control_sockets.swap_remove(index); |
| if let Some(socket) = control_sockets.get(index) { |
| poll_ctx |
| .add(socket, Token::VmControl { index }) |
| .map_err(Error::PollContextAdd)?; |
| } |
| } |
| } |
| |
| // VCPU threads MUST see the VmRunMode flag, otherwise they may re-enter the VM. |
| run_mode_arc.set_and_notify(VmRunMode::Exiting); |
| for handle in vcpu_handles { |
| match handle.kill(SIGRTMIN() + 0) { |
| Ok(_) => { |
| if let Err(e) = handle.join() { |
| error!("failed to join vcpu thread: {:?}", e); |
| } |
| } |
| Err(e) => error!("failed to kill vcpu thread: {}", e), |
| } |
| } |
| |
| stdin_lock |
| .set_canon_mode() |
| .expect("failed to restore canonical mode for terminal"); |
| |
| Ok(()) |
| } |