2020-03-20 03:43:17 +00:00
|
|
|
// Copyright (c) 2020 Ant Financial
|
|
|
|
//
|
|
|
|
// 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.
|
|
|
|
|
|
|
|
use super::{
|
2020-08-11 16:12:12 +00:00
|
|
|
ActivateError, ActivateResult, EpollHelper, EpollHelperError, EpollHelperHandler, Queue,
|
|
|
|
VirtioDevice, VirtioDeviceType, EPOLL_HELPER_EVENT_LAST, VIRTIO_F_VERSION_1,
|
2020-03-20 03:43:17 +00:00
|
|
|
};
|
|
|
|
use crate::vm_memory::GuestMemory;
|
|
|
|
use crate::{VirtioInterrupt, VirtioInterruptType};
|
|
|
|
use libc::EFD_NONBLOCK;
|
2020-07-16 09:34:51 +00:00
|
|
|
use std::io;
|
2020-03-20 03:43:17 +00:00
|
|
|
use std::mem::size_of;
|
2020-08-11 16:12:12 +00:00
|
|
|
use std::os::unix::io::AsRawFd;
|
2020-03-20 03:43:17 +00:00
|
|
|
use std::result;
|
|
|
|
use std::sync::atomic::{AtomicBool, AtomicU64, Ordering};
|
|
|
|
use std::sync::mpsc;
|
|
|
|
use std::sync::{Arc, Mutex};
|
|
|
|
use std::thread;
|
|
|
|
use vm_memory::{
|
|
|
|
Address, ByteValued, Bytes, GuestAddress, GuestAddressSpace, GuestMemoryAtomic,
|
2020-06-05 15:14:27 +00:00
|
|
|
GuestMemoryError, GuestMemoryMmap,
|
2020-03-20 03:43:17 +00:00
|
|
|
};
|
|
|
|
use vm_migration::{Migratable, MigratableError, Pausable, Snapshottable, Transportable};
|
|
|
|
use vmm_sys_util::eventfd::EventFd;
|
|
|
|
|
|
|
|
const QUEUE_SIZE: u16 = 128;
|
|
|
|
const NUM_QUEUES: usize = 2;
|
|
|
|
const QUEUE_SIZES: &[u16] = &[QUEUE_SIZE; NUM_QUEUES];
|
|
|
|
|
|
|
|
// Get resize event.
|
2020-08-11 16:12:12 +00:00
|
|
|
const RESIZE_EVENT: u16 = EPOLL_HELPER_EVENT_LAST + 1;
|
2020-03-20 03:43:17 +00:00
|
|
|
// New descriptors are pending on the virtio queue.
|
2020-08-11 16:12:12 +00:00
|
|
|
const INFLATE_QUEUE_EVENT: u16 = EPOLL_HELPER_EVENT_LAST + 2;
|
2020-03-20 03:43:17 +00:00
|
|
|
// New descriptors are pending on the virtio queue.
|
2020-08-11 16:12:12 +00:00
|
|
|
const DEFLATE_QUEUE_EVENT: u16 = EPOLL_HELPER_EVENT_LAST + 3;
|
2020-03-20 03:43:17 +00:00
|
|
|
|
|
|
|
// Page shift in the host.
|
|
|
|
const PAGE_SHIFT: u32 = 12;
|
|
|
|
|
|
|
|
// Size of a PFN in the balloon interface.
|
|
|
|
const VIRTIO_BALLOON_PFN_SHIFT: u64 = 12;
|
|
|
|
|
|
|
|
#[derive(Debug)]
|
|
|
|
pub enum Error {
|
|
|
|
// Guest gave us bad memory addresses.
|
|
|
|
GuestMemory(GuestMemoryError),
|
|
|
|
// Guest gave us a write only descriptor that protocol says to read from.
|
|
|
|
UnexpectedWriteOnlyDescriptor,
|
|
|
|
// Guest sent us invalid request.
|
|
|
|
InvalidRequest,
|
|
|
|
// Madvise fail.
|
|
|
|
MadviseFail(std::io::Error),
|
|
|
|
// Failed to EventFd write.
|
|
|
|
EventFdWriteFail(std::io::Error),
|
|
|
|
// Failed to EventFd try_clone.
|
|
|
|
EventFdTryCloneFail(std::io::Error),
|
|
|
|
// Failed to MpscRecv.
|
|
|
|
MpscRecvFail(mpsc::RecvError),
|
|
|
|
// Resize invalid argument
|
|
|
|
ResizeInval(String),
|
|
|
|
// process_queue got wrong ev_type
|
|
|
|
ProcessQueueWrongEvType(u16),
|
|
|
|
// Fail tp signal
|
|
|
|
FailedSignal(io::Error),
|
|
|
|
}
|
|
|
|
|
|
|
|
// Got from include/uapi/linux/virtio_balloon.h
|
|
|
|
#[repr(C, packed)]
|
|
|
|
#[derive(Copy, Clone, Debug, Default)]
|
|
|
|
struct VirtioBalloonConfig {
|
|
|
|
// Number of pages host wants Guest to give up.
|
|
|
|
num_pages: u32,
|
|
|
|
// Number of pages we've actually got in balloon.
|
|
|
|
actual: u32,
|
|
|
|
}
|
|
|
|
|
|
|
|
// Safe because it only has data and has no implicit padding.
|
|
|
|
unsafe impl ByteValued for VirtioBalloonConfig {}
|
|
|
|
|
|
|
|
struct VirtioBalloonResizeReceiver {
|
|
|
|
size: Arc<AtomicU64>,
|
|
|
|
tx: mpsc::Sender<Result<(), Error>>,
|
|
|
|
evt: EventFd,
|
|
|
|
}
|
|
|
|
|
|
|
|
impl VirtioBalloonResizeReceiver {
|
|
|
|
fn get_size(&self) -> u64 {
|
|
|
|
self.size.load(Ordering::SeqCst)
|
|
|
|
}
|
|
|
|
|
|
|
|
fn send(&self, r: Result<(), Error>) -> Result<(), mpsc::SendError<Result<(), Error>>> {
|
|
|
|
self.tx.send(r)
|
|
|
|
}
|
|
|
|
}
|
|
|
|
|
|
|
|
struct VirtioBalloonResize {
|
|
|
|
size: Arc<AtomicU64>,
|
|
|
|
tx: mpsc::Sender<Result<(), Error>>,
|
|
|
|
rx: mpsc::Receiver<Result<(), Error>>,
|
|
|
|
evt: EventFd,
|
|
|
|
}
|
|
|
|
|
|
|
|
impl VirtioBalloonResize {
|
|
|
|
pub fn new() -> io::Result<Self> {
|
|
|
|
let (tx, rx) = mpsc::channel();
|
|
|
|
|
|
|
|
Ok(Self {
|
|
|
|
size: Arc::new(AtomicU64::new(0)),
|
|
|
|
tx,
|
|
|
|
rx,
|
|
|
|
evt: EventFd::new(EFD_NONBLOCK)?,
|
|
|
|
})
|
|
|
|
}
|
|
|
|
|
|
|
|
pub fn get_receiver(&self) -> Result<VirtioBalloonResizeReceiver, Error> {
|
|
|
|
Ok(VirtioBalloonResizeReceiver {
|
|
|
|
size: self.size.clone(),
|
|
|
|
tx: self.tx.clone(),
|
|
|
|
evt: self.evt.try_clone().map_err(Error::EventFdTryCloneFail)?,
|
|
|
|
})
|
|
|
|
}
|
|
|
|
|
|
|
|
pub fn work(&self, size: u64) -> Result<(), Error> {
|
|
|
|
self.size.store(size, Ordering::SeqCst);
|
|
|
|
self.evt.write(1).map_err(Error::EventFdWriteFail)?;
|
|
|
|
self.rx.recv().map_err(Error::MpscRecvFail)?
|
|
|
|
}
|
|
|
|
}
|
|
|
|
|
|
|
|
struct BalloonEpollHandler {
|
|
|
|
config: Arc<Mutex<VirtioBalloonConfig>>,
|
|
|
|
resize_receiver: VirtioBalloonResizeReceiver,
|
|
|
|
queues: Vec<Queue>,
|
|
|
|
mem: GuestMemoryAtomic<GuestMemoryMmap>,
|
|
|
|
interrupt_cb: Arc<dyn VirtioInterrupt>,
|
|
|
|
inflate_queue_evt: EventFd,
|
|
|
|
deflate_queue_evt: EventFd,
|
|
|
|
kill_evt: EventFd,
|
|
|
|
pause_evt: EventFd,
|
|
|
|
}
|
|
|
|
|
|
|
|
impl BalloonEpollHandler {
|
|
|
|
fn signal(
|
|
|
|
&self,
|
|
|
|
int_type: &VirtioInterruptType,
|
|
|
|
queue: Option<&Queue>,
|
|
|
|
) -> result::Result<(), Error> {
|
|
|
|
self.interrupt_cb.trigger(int_type, queue).map_err(|e| {
|
|
|
|
error!("Failed to signal used queue: {:?}", e);
|
|
|
|
Error::FailedSignal(e)
|
|
|
|
})
|
|
|
|
}
|
|
|
|
|
|
|
|
fn process_queue(&mut self, ev_type: u16) -> result::Result<(), Error> {
|
|
|
|
let queue_index = match ev_type {
|
|
|
|
INFLATE_QUEUE_EVENT => 0,
|
|
|
|
DEFLATE_QUEUE_EVENT => 1,
|
|
|
|
_ => return Err(Error::ProcessQueueWrongEvType(ev_type)),
|
|
|
|
};
|
|
|
|
|
|
|
|
let mut used_desc_heads = [0; QUEUE_SIZE as usize];
|
|
|
|
let mut used_count = 0;
|
|
|
|
let mem = self.mem.memory();
|
|
|
|
for avail_desc in self.queues[queue_index].iter(&mem) {
|
|
|
|
used_desc_heads[used_count] = avail_desc.index;
|
|
|
|
used_count += 1;
|
|
|
|
|
2020-06-05 15:14:27 +00:00
|
|
|
let data_chunk_size = size_of::<u32>();
|
|
|
|
|
2020-03-20 03:43:17 +00:00
|
|
|
// The head contains the request type which MUST be readable.
|
|
|
|
if avail_desc.is_write_only() {
|
|
|
|
error!("The head contains the request type is not right");
|
|
|
|
return Err(Error::UnexpectedWriteOnlyDescriptor);
|
|
|
|
}
|
2020-06-05 15:14:27 +00:00
|
|
|
if avail_desc.len as usize % data_chunk_size != 0 {
|
2020-03-20 03:43:17 +00:00
|
|
|
error!("the request size {} is not right", avail_desc.len);
|
|
|
|
return Err(Error::InvalidRequest);
|
|
|
|
}
|
|
|
|
|
|
|
|
let mut offset = 0u64;
|
|
|
|
while offset < avail_desc.len as u64 {
|
2020-06-05 15:14:27 +00:00
|
|
|
let addr = avail_desc.addr.checked_add(offset).unwrap();
|
|
|
|
let pfn: u32 = mem.read_obj(addr).map_err(Error::GuestMemory)?;
|
|
|
|
offset += data_chunk_size as u64;
|
|
|
|
|
|
|
|
let gpa = (pfn as u64) << VIRTIO_BALLOON_PFN_SHIFT;
|
|
|
|
if let Ok(hva) = mem.get_host_address(GuestAddress(gpa)) {
|
2020-03-20 03:43:17 +00:00
|
|
|
let advice = match ev_type {
|
|
|
|
INFLATE_QUEUE_EVENT => libc::MADV_DONTNEED,
|
|
|
|
DEFLATE_QUEUE_EVENT => libc::MADV_WILLNEED,
|
|
|
|
_ => return Err(Error::ProcessQueueWrongEvType(ev_type)),
|
|
|
|
};
|
|
|
|
// Need unsafe to do syscall madvise
|
|
|
|
let res = unsafe {
|
|
|
|
libc::madvise(
|
2020-06-05 15:14:27 +00:00
|
|
|
hva as *mut libc::c_void,
|
2020-03-20 03:43:17 +00:00
|
|
|
(1 << PAGE_SHIFT) as libc::size_t,
|
|
|
|
advice,
|
|
|
|
)
|
|
|
|
};
|
|
|
|
if res != 0 {
|
|
|
|
return Err(Error::MadviseFail(io::Error::last_os_error()));
|
|
|
|
}
|
|
|
|
} else {
|
2020-06-05 15:14:27 +00:00
|
|
|
error!("Address 0x{:x} is not available", gpa);
|
2020-03-20 03:43:17 +00:00
|
|
|
return Err(Error::InvalidRequest);
|
|
|
|
}
|
|
|
|
}
|
|
|
|
}
|
|
|
|
|
|
|
|
for &desc_index in &used_desc_heads[..used_count] {
|
|
|
|
self.queues[queue_index].add_used(&mem, desc_index, 0);
|
|
|
|
}
|
|
|
|
if used_count > 0 {
|
|
|
|
self.signal(&VirtioInterruptType::Queue, Some(&self.queues[queue_index]))?;
|
|
|
|
}
|
|
|
|
|
|
|
|
Ok(())
|
|
|
|
}
|
|
|
|
|
2020-08-11 16:12:12 +00:00
|
|
|
fn run(&mut self, paused: Arc<AtomicBool>) -> result::Result<(), EpollHelperError> {
|
|
|
|
let mut helper = EpollHelper::new(&self.kill_evt, &self.pause_evt)?;
|
|
|
|
helper.add_event(self.resize_receiver.evt.as_raw_fd(), RESIZE_EVENT)?;
|
|
|
|
helper.add_event(self.inflate_queue_evt.as_raw_fd(), INFLATE_QUEUE_EVENT)?;
|
|
|
|
helper.add_event(self.deflate_queue_evt.as_raw_fd(), DEFLATE_QUEUE_EVENT)?;
|
|
|
|
helper.run(paused, self)?;
|
|
|
|
|
|
|
|
Ok(())
|
|
|
|
}
|
|
|
|
}
|
|
|
|
|
|
|
|
impl EpollHelperHandler for BalloonEpollHandler {
|
2020-08-11 17:12:02 +00:00
|
|
|
fn handle_event(&mut self, _helper: &mut EpollHelper, event: &epoll::Event) -> bool {
|
|
|
|
let ev_type = event.data as u16;
|
|
|
|
match ev_type {
|
2020-08-11 16:12:12 +00:00
|
|
|
RESIZE_EVENT => {
|
|
|
|
if let Err(e) = self.resize_receiver.evt.read() {
|
|
|
|
error!("Failed to get resize event: {:?}", e);
|
|
|
|
return true;
|
2020-03-20 03:43:17 +00:00
|
|
|
}
|
2020-08-11 16:12:12 +00:00
|
|
|
let mut signal_error = false;
|
|
|
|
let r = {
|
|
|
|
let mut config = self.config.lock().unwrap();
|
|
|
|
config.num_pages = (self.resize_receiver.get_size() >> PAGE_SHIFT) as u32;
|
|
|
|
if let Err(e) = self.signal(&VirtioInterruptType::Config, None) {
|
|
|
|
signal_error = true;
|
|
|
|
Err(e)
|
|
|
|
} else {
|
|
|
|
Ok(())
|
2020-03-20 03:43:17 +00:00
|
|
|
}
|
2020-08-11 16:12:12 +00:00
|
|
|
};
|
|
|
|
if let Err(e) = &r {
|
|
|
|
// This error will send back to resize caller.
|
|
|
|
error!("Handle resize event get error: {:?}", e);
|
|
|
|
}
|
|
|
|
if let Err(e) = self.resize_receiver.send(r) {
|
|
|
|
error!("Sending \"resize\" generated error: {:?}", e);
|
|
|
|
return true;
|
|
|
|
}
|
|
|
|
if signal_error {
|
|
|
|
return true;
|
|
|
|
}
|
|
|
|
}
|
|
|
|
INFLATE_QUEUE_EVENT => {
|
|
|
|
if let Err(e) = self.inflate_queue_evt.read() {
|
|
|
|
error!("Failed to get inflate queue event: {:?}", e);
|
|
|
|
return true;
|
2020-08-11 17:12:02 +00:00
|
|
|
} else if let Err(e) = self.process_queue(ev_type) {
|
2020-08-11 16:12:12 +00:00
|
|
|
error!("Failed to signal used inflate queue: {:?}", e);
|
|
|
|
return true;
|
2020-03-20 03:43:17 +00:00
|
|
|
}
|
|
|
|
}
|
2020-08-11 16:12:12 +00:00
|
|
|
DEFLATE_QUEUE_EVENT => {
|
|
|
|
if let Err(e) = self.deflate_queue_evt.read() {
|
|
|
|
error!("Failed to get deflate queue event: {:?}", e);
|
|
|
|
return true;
|
2020-08-11 17:12:02 +00:00
|
|
|
} else if let Err(e) = self.process_queue(ev_type) {
|
2020-08-11 16:12:12 +00:00
|
|
|
error!("Failed to signal used deflate queue: {:?}", e);
|
|
|
|
return true;
|
|
|
|
}
|
|
|
|
}
|
|
|
|
_ => {
|
|
|
|
error!("Unknown event for virtio-mem");
|
|
|
|
return true;
|
|
|
|
}
|
2020-03-20 03:43:17 +00:00
|
|
|
}
|
|
|
|
|
2020-08-11 16:12:12 +00:00
|
|
|
false
|
2020-03-20 03:43:17 +00:00
|
|
|
}
|
|
|
|
}
|
|
|
|
|
|
|
|
// Virtio device for exposing entropy to the guest OS through virtio.
|
|
|
|
pub struct Balloon {
|
|
|
|
id: String,
|
|
|
|
resize: VirtioBalloonResize,
|
|
|
|
kill_evt: Option<EventFd>,
|
|
|
|
pause_evt: Option<EventFd>,
|
|
|
|
avail_features: u64,
|
|
|
|
pub acked_features: u64,
|
|
|
|
config: Arc<Mutex<VirtioBalloonConfig>>,
|
|
|
|
queue_evts: Option<Vec<EventFd>>,
|
|
|
|
interrupt_cb: Option<Arc<dyn VirtioInterrupt>>,
|
2020-08-11 16:12:12 +00:00
|
|
|
epoll_threads: Option<Vec<thread::JoinHandle<result::Result<(), EpollHelperError>>>>,
|
2020-03-20 03:43:17 +00:00
|
|
|
paused: Arc<AtomicBool>,
|
|
|
|
}
|
|
|
|
|
|
|
|
impl Balloon {
|
|
|
|
// Create a new virtio-balloon.
|
2020-06-23 09:52:30 +00:00
|
|
|
pub fn new(id: String, size: u64) -> io::Result<Self> {
|
2020-03-20 03:43:17 +00:00
|
|
|
let avail_features = 1u64 << VIRTIO_F_VERSION_1;
|
|
|
|
|
2020-06-23 09:52:30 +00:00
|
|
|
let mut config = VirtioBalloonConfig::default();
|
|
|
|
config.num_pages = (size >> PAGE_SHIFT) as u32;
|
2020-03-20 03:43:17 +00:00
|
|
|
|
|
|
|
Ok(Balloon {
|
|
|
|
id,
|
|
|
|
resize: VirtioBalloonResize::new()?,
|
|
|
|
kill_evt: None,
|
|
|
|
pause_evt: None,
|
|
|
|
avail_features,
|
|
|
|
acked_features: 0u64,
|
|
|
|
config: Arc::new(Mutex::new(config)),
|
|
|
|
queue_evts: None,
|
|
|
|
interrupt_cb: None,
|
|
|
|
epoll_threads: None,
|
|
|
|
paused: Arc::new(AtomicBool::new(false)),
|
|
|
|
})
|
|
|
|
}
|
|
|
|
|
|
|
|
pub fn resize(&self, size: u64) -> Result<(), Error> {
|
|
|
|
self.resize.work(size)
|
|
|
|
}
|
|
|
|
}
|
|
|
|
|
|
|
|
impl Drop for Balloon {
|
|
|
|
fn drop(&mut self) {
|
|
|
|
if let Some(kill_evt) = self.kill_evt.take() {
|
|
|
|
// Ignore the result because there is nothing we can do about it.
|
|
|
|
let _ = kill_evt.write(1);
|
|
|
|
}
|
|
|
|
}
|
|
|
|
}
|
|
|
|
|
|
|
|
impl VirtioDevice for Balloon {
|
|
|
|
fn device_type(&self) -> u32 {
|
|
|
|
VirtioDeviceType::TYPE_BALLOON as u32
|
|
|
|
}
|
|
|
|
|
|
|
|
fn queue_max_sizes(&self) -> &[u16] {
|
|
|
|
QUEUE_SIZES
|
|
|
|
}
|
|
|
|
|
|
|
|
fn features(&self) -> u64 {
|
|
|
|
self.avail_features
|
|
|
|
}
|
|
|
|
|
|
|
|
fn ack_features(&mut self, value: u64) {
|
|
|
|
let mut v = value;
|
|
|
|
// Check if the guest is ACK'ing a feature that we didn't claim to have.
|
|
|
|
let unrequested_features = v & !self.avail_features;
|
|
|
|
if unrequested_features != 0 {
|
|
|
|
warn!("Received acknowledge request for unknown feature.");
|
|
|
|
|
|
|
|
// Don't count these features as acked.
|
|
|
|
v &= !unrequested_features;
|
|
|
|
}
|
|
|
|
self.acked_features |= v;
|
|
|
|
}
|
|
|
|
|
2020-07-16 09:34:51 +00:00
|
|
|
fn read_config(&self, offset: u64, data: &mut [u8]) {
|
|
|
|
self.read_config_from_slice(self.config.lock().unwrap().as_slice(), offset, data);
|
2020-03-20 03:43:17 +00:00
|
|
|
}
|
|
|
|
|
|
|
|
fn activate(
|
|
|
|
&mut self,
|
|
|
|
mem: GuestMemoryAtomic<GuestMemoryMmap>,
|
|
|
|
interrupt_cb: Arc<dyn VirtioInterrupt>,
|
|
|
|
queues: Vec<Queue>,
|
|
|
|
mut queue_evts: Vec<EventFd>,
|
|
|
|
) -> ActivateResult {
|
|
|
|
if queues.len() != NUM_QUEUES || queue_evts.len() != NUM_QUEUES {
|
|
|
|
error!(
|
|
|
|
"Cannot perform activate. Expected {} queue(s), got {}",
|
|
|
|
NUM_QUEUES,
|
|
|
|
queues.len()
|
|
|
|
);
|
|
|
|
return Err(ActivateError::BadActivate);
|
|
|
|
}
|
|
|
|
|
|
|
|
let (self_kill_evt, kill_evt) = EventFd::new(EFD_NONBLOCK)
|
|
|
|
.and_then(|e| Ok((e.try_clone()?, e)))
|
|
|
|
.map_err(|e| {
|
|
|
|
error!("failed creating kill EventFd pair: {}", e);
|
|
|
|
ActivateError::BadActivate
|
|
|
|
})?;
|
|
|
|
self.kill_evt = Some(self_kill_evt);
|
|
|
|
|
|
|
|
let (self_pause_evt, pause_evt) = EventFd::new(EFD_NONBLOCK)
|
|
|
|
.and_then(|e| Ok((e.try_clone()?, e)))
|
|
|
|
.map_err(|e| {
|
|
|
|
error!("failed creating pause EventFd pair: {}", e);
|
|
|
|
ActivateError::BadActivate
|
|
|
|
})?;
|
|
|
|
self.pause_evt = Some(self_pause_evt);
|
|
|
|
|
|
|
|
self.interrupt_cb = Some(interrupt_cb.clone());
|
|
|
|
|
|
|
|
let mut tmp_queue_evts: Vec<EventFd> = Vec::new();
|
|
|
|
for queue_evt in queue_evts.iter() {
|
|
|
|
// Save the queue EventFD as we need to return it on reset
|
|
|
|
// but clone it to pass into the thread.
|
|
|
|
tmp_queue_evts.push(queue_evt.try_clone().map_err(|e| {
|
|
|
|
error!("failed to clone queue EventFd: {}", e);
|
|
|
|
ActivateError::BadActivate
|
|
|
|
})?);
|
|
|
|
}
|
|
|
|
self.queue_evts = Some(tmp_queue_evts);
|
|
|
|
|
|
|
|
let mut handler = BalloonEpollHandler {
|
|
|
|
config: self.config.clone(),
|
|
|
|
resize_receiver: self.resize.get_receiver().map_err(|e| {
|
|
|
|
error!("failed to clone resize EventFd: {:?}", e);
|
|
|
|
ActivateError::BadActivate
|
|
|
|
})?,
|
|
|
|
queues,
|
|
|
|
mem,
|
|
|
|
interrupt_cb,
|
|
|
|
inflate_queue_evt: queue_evts.remove(0),
|
|
|
|
deflate_queue_evt: queue_evts.remove(0),
|
|
|
|
kill_evt,
|
|
|
|
pause_evt,
|
|
|
|
};
|
|
|
|
|
|
|
|
let paused = self.paused.clone();
|
|
|
|
let mut epoll_threads = Vec::new();
|
|
|
|
thread::Builder::new()
|
|
|
|
.name("virtio_balloon".to_string())
|
|
|
|
.spawn(move || handler.run(paused))
|
|
|
|
.map(|thread| epoll_threads.push(thread))
|
|
|
|
.map_err(|e| {
|
|
|
|
error!("failed to clone virtio-balloon epoll thread: {}", e);
|
|
|
|
ActivateError::BadActivate
|
|
|
|
})?;
|
|
|
|
self.epoll_threads = Some(epoll_threads);
|
|
|
|
|
|
|
|
Ok(())
|
|
|
|
}
|
|
|
|
|
|
|
|
fn reset(&mut self) -> Option<(Arc<dyn VirtioInterrupt>, Vec<EventFd>)> {
|
|
|
|
// We first must resume the virtio thread if it was paused.
|
|
|
|
if self.pause_evt.take().is_some() {
|
|
|
|
self.resume().ok()?;
|
|
|
|
}
|
|
|
|
|
|
|
|
if let Some(kill_evt) = self.kill_evt.take() {
|
|
|
|
// Ignore the result because there is nothing we can do about it.
|
|
|
|
let _ = kill_evt.write(1);
|
|
|
|
}
|
|
|
|
|
|
|
|
// Return the interrupt and queue EventFDs
|
|
|
|
Some((
|
|
|
|
self.interrupt_cb.take().unwrap(),
|
|
|
|
self.queue_evts.take().unwrap(),
|
|
|
|
))
|
|
|
|
}
|
|
|
|
}
|
|
|
|
|
|
|
|
virtio_pausable!(Balloon);
|
|
|
|
impl Snapshottable for Balloon {
|
|
|
|
fn id(&self) -> String {
|
|
|
|
self.id.clone()
|
|
|
|
}
|
|
|
|
}
|
|
|
|
impl Transportable for Balloon {}
|
|
|
|
impl Migratable for Balloon {}
|