2020-03-20 03:43:17 +00:00
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// Copyright (c) 2020 Ant Financial
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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use super::{
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2020-08-11 16:12:12 +00:00
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ActivateError, ActivateResult, EpollHelper, EpollHelperError, EpollHelperHandler, Queue,
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2020-09-03 09:37:36 +00:00
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VirtioCommon, VirtioDevice, VirtioDeviceType, EPOLL_HELPER_EVENT_LAST, VIRTIO_F_VERSION_1,
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2020-03-20 03:43:17 +00:00
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};
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2020-08-18 02:58:13 +00:00
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use crate::seccomp_filters::{get_seccomp_filter, Thread};
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2020-03-20 03:43:17 +00:00
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use crate::vm_memory::GuestMemory;
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use crate::{VirtioInterrupt, VirtioInterruptType};
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use libc::EFD_NONBLOCK;
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2020-08-18 02:58:13 +00:00
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use seccomp::{SeccompAction, SeccompFilter};
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2020-07-16 09:34:51 +00:00
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use std::io;
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2020-03-20 03:43:17 +00:00
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use std::mem::size_of;
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2020-08-11 16:12:12 +00:00
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use std::os::unix::io::AsRawFd;
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2020-03-20 03:43:17 +00:00
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use std::result;
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use std::sync::atomic::{AtomicBool, AtomicU64, Ordering};
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use std::sync::mpsc;
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2020-08-11 14:05:06 +00:00
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use std::sync::{Arc, Barrier, Mutex};
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2020-03-20 03:43:17 +00:00
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use std::thread;
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use vm_memory::{
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Address, ByteValued, Bytes, GuestAddress, GuestAddressSpace, GuestMemoryAtomic,
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2020-06-05 15:14:27 +00:00
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GuestMemoryError, GuestMemoryMmap,
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};
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use vm_migration::{Migratable, MigratableError, Pausable, Snapshottable, Transportable};
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use vmm_sys_util::eventfd::EventFd;
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const QUEUE_SIZE: u16 = 128;
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const NUM_QUEUES: usize = 2;
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const QUEUE_SIZES: &[u16] = &[QUEUE_SIZE; NUM_QUEUES];
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// Get resize event.
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const RESIZE_EVENT: u16 = EPOLL_HELPER_EVENT_LAST + 1;
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// New descriptors are pending on the virtio queue.
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2020-08-11 16:12:12 +00:00
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const INFLATE_QUEUE_EVENT: u16 = EPOLL_HELPER_EVENT_LAST + 2;
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2020-03-20 03:43:17 +00:00
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// New descriptors are pending on the virtio queue.
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const DEFLATE_QUEUE_EVENT: u16 = EPOLL_HELPER_EVENT_LAST + 3;
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// Page shift in the host.
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const PAGE_SHIFT: u32 = 12;
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// Size of a PFN in the balloon interface.
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const VIRTIO_BALLOON_PFN_SHIFT: u64 = 12;
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#[derive(Debug)]
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pub enum Error {
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// Guest gave us bad memory addresses.
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GuestMemory(GuestMemoryError),
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// Guest gave us a write only descriptor that protocol says to read from.
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UnexpectedWriteOnlyDescriptor,
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// Guest sent us invalid request.
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InvalidRequest,
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// Madvise fail.
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MadviseFail(std::io::Error),
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// Failed to EventFd write.
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EventFdWriteFail(std::io::Error),
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// Failed to EventFd try_clone.
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EventFdTryCloneFail(std::io::Error),
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// Failed to MpscRecv.
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MpscRecvFail(mpsc::RecvError),
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// Resize invalid argument
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ResizeInval(String),
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// process_queue got wrong ev_type
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ProcessQueueWrongEvType(u16),
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// Fail tp signal
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FailedSignal(io::Error),
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}
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// Got from include/uapi/linux/virtio_balloon.h
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#[repr(C, packed)]
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#[derive(Copy, Clone, Debug, Default)]
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struct VirtioBalloonConfig {
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// Number of pages host wants Guest to give up.
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num_pages: u32,
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// Number of pages we've actually got in balloon.
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actual: u32,
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}
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// Safe because it only has data and has no implicit padding.
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unsafe impl ByteValued for VirtioBalloonConfig {}
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struct VirtioBalloonResizeReceiver {
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size: Arc<AtomicU64>,
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tx: mpsc::Sender<Result<(), Error>>,
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evt: EventFd,
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}
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impl VirtioBalloonResizeReceiver {
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fn get_size(&self) -> u64 {
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self.size.load(Ordering::SeqCst)
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}
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fn send(&self, r: Result<(), Error>) -> Result<(), mpsc::SendError<Result<(), Error>>> {
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self.tx.send(r)
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}
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}
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struct VirtioBalloonResize {
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size: Arc<AtomicU64>,
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tx: mpsc::Sender<Result<(), Error>>,
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rx: mpsc::Receiver<Result<(), Error>>,
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evt: EventFd,
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}
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impl VirtioBalloonResize {
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pub fn new() -> io::Result<Self> {
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let (tx, rx) = mpsc::channel();
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Ok(Self {
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size: Arc::new(AtomicU64::new(0)),
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tx,
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rx,
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evt: EventFd::new(EFD_NONBLOCK)?,
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})
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}
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pub fn get_receiver(&self) -> Result<VirtioBalloonResizeReceiver, Error> {
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Ok(VirtioBalloonResizeReceiver {
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size: self.size.clone(),
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tx: self.tx.clone(),
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evt: self.evt.try_clone().map_err(Error::EventFdTryCloneFail)?,
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})
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}
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pub fn work(&self, size: u64) -> Result<(), Error> {
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self.size.store(size, Ordering::SeqCst);
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self.evt.write(1).map_err(Error::EventFdWriteFail)?;
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self.rx.recv().map_err(Error::MpscRecvFail)?
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}
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}
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struct BalloonEpollHandler {
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config: Arc<Mutex<VirtioBalloonConfig>>,
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resize_receiver: VirtioBalloonResizeReceiver,
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queues: Vec<Queue>,
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mem: GuestMemoryAtomic<GuestMemoryMmap>,
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interrupt_cb: Arc<dyn VirtioInterrupt>,
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inflate_queue_evt: EventFd,
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deflate_queue_evt: EventFd,
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kill_evt: EventFd,
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pause_evt: EventFd,
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}
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impl BalloonEpollHandler {
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fn signal(
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&self,
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int_type: &VirtioInterruptType,
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queue: Option<&Queue>,
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) -> result::Result<(), Error> {
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self.interrupt_cb.trigger(int_type, queue).map_err(|e| {
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error!("Failed to signal used queue: {:?}", e);
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Error::FailedSignal(e)
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})
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}
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fn process_queue(&mut self, ev_type: u16) -> result::Result<(), Error> {
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let queue_index = match ev_type {
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INFLATE_QUEUE_EVENT => 0,
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DEFLATE_QUEUE_EVENT => 1,
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_ => return Err(Error::ProcessQueueWrongEvType(ev_type)),
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};
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let mut used_desc_heads = [0; QUEUE_SIZE as usize];
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let mut used_count = 0;
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let mem = self.mem.memory();
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for avail_desc in self.queues[queue_index].iter(&mem) {
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used_desc_heads[used_count] = avail_desc.index;
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used_count += 1;
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2020-06-05 15:14:27 +00:00
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let data_chunk_size = size_of::<u32>();
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2020-03-20 03:43:17 +00:00
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// The head contains the request type which MUST be readable.
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if avail_desc.is_write_only() {
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error!("The head contains the request type is not right");
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return Err(Error::UnexpectedWriteOnlyDescriptor);
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}
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if avail_desc.len as usize % data_chunk_size != 0 {
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error!("the request size {} is not right", avail_desc.len);
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return Err(Error::InvalidRequest);
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}
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let mut offset = 0u64;
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while offset < avail_desc.len as u64 {
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2020-06-05 15:14:27 +00:00
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let addr = avail_desc.addr.checked_add(offset).unwrap();
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let pfn: u32 = mem.read_obj(addr).map_err(Error::GuestMemory)?;
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offset += data_chunk_size as u64;
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let gpa = (pfn as u64) << VIRTIO_BALLOON_PFN_SHIFT;
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if let Ok(hva) = mem.get_host_address(GuestAddress(gpa)) {
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2020-03-20 03:43:17 +00:00
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let advice = match ev_type {
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INFLATE_QUEUE_EVENT => libc::MADV_DONTNEED,
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DEFLATE_QUEUE_EVENT => libc::MADV_WILLNEED,
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_ => return Err(Error::ProcessQueueWrongEvType(ev_type)),
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};
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// Need unsafe to do syscall madvise
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let res = unsafe {
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libc::madvise(
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hva as *mut libc::c_void,
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(1 << PAGE_SHIFT) as libc::size_t,
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advice,
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)
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};
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if res != 0 {
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return Err(Error::MadviseFail(io::Error::last_os_error()));
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}
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} else {
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error!("Address 0x{:x} is not available", gpa);
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return Err(Error::InvalidRequest);
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}
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}
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}
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for &desc_index in &used_desc_heads[..used_count] {
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self.queues[queue_index].add_used(&mem, desc_index, 0);
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}
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if used_count > 0 {
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self.signal(&VirtioInterruptType::Queue, Some(&self.queues[queue_index]))?;
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}
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Ok(())
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}
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2020-08-11 14:05:06 +00:00
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fn run(
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&mut self,
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paused: Arc<AtomicBool>,
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paused_sync: Arc<Barrier>,
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) -> result::Result<(), EpollHelperError> {
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2020-08-11 16:12:12 +00:00
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let mut helper = EpollHelper::new(&self.kill_evt, &self.pause_evt)?;
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helper.add_event(self.resize_receiver.evt.as_raw_fd(), RESIZE_EVENT)?;
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helper.add_event(self.inflate_queue_evt.as_raw_fd(), INFLATE_QUEUE_EVENT)?;
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helper.add_event(self.deflate_queue_evt.as_raw_fd(), DEFLATE_QUEUE_EVENT)?;
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2020-08-11 14:05:06 +00:00
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helper.run(paused, paused_sync, self)?;
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Ok(())
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}
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}
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impl EpollHelperHandler for BalloonEpollHandler {
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fn handle_event(&mut self, _helper: &mut EpollHelper, event: &epoll::Event) -> bool {
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let ev_type = event.data as u16;
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match ev_type {
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2020-08-11 16:12:12 +00:00
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RESIZE_EVENT => {
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if let Err(e) = self.resize_receiver.evt.read() {
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error!("Failed to get resize event: {:?}", e);
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return true;
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}
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let mut signal_error = false;
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let r = {
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let mut config = self.config.lock().unwrap();
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config.num_pages = (self.resize_receiver.get_size() >> PAGE_SHIFT) as u32;
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if let Err(e) = self.signal(&VirtioInterruptType::Config, None) {
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signal_error = true;
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Err(e)
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} else {
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Ok(())
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}
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2020-08-11 16:12:12 +00:00
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};
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if let Err(e) = &r {
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// This error will send back to resize caller.
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error!("Handle resize event get error: {:?}", e);
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}
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if let Err(e) = self.resize_receiver.send(r) {
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error!("Sending \"resize\" generated error: {:?}", e);
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return true;
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}
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if signal_error {
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return true;
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}
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}
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INFLATE_QUEUE_EVENT => {
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if let Err(e) = self.inflate_queue_evt.read() {
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error!("Failed to get inflate queue event: {:?}", e);
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return true;
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2020-08-11 17:12:02 +00:00
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} else if let Err(e) = self.process_queue(ev_type) {
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2020-08-11 16:12:12 +00:00
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error!("Failed to signal used inflate queue: {:?}", e);
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return true;
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2020-03-20 03:43:17 +00:00
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}
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}
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2020-08-11 16:12:12 +00:00
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DEFLATE_QUEUE_EVENT => {
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if let Err(e) = self.deflate_queue_evt.read() {
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error!("Failed to get deflate queue event: {:?}", e);
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return true;
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2020-08-11 17:12:02 +00:00
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} else if let Err(e) = self.process_queue(ev_type) {
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2020-08-11 16:12:12 +00:00
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error!("Failed to signal used deflate queue: {:?}", e);
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return true;
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}
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}
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_ => {
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error!("Unknown event for virtio-mem");
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return true;
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}
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2020-03-20 03:43:17 +00:00
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}
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2020-08-11 16:12:12 +00:00
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false
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2020-03-20 03:43:17 +00:00
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}
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}
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// Virtio device for exposing entropy to the guest OS through virtio.
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pub struct Balloon {
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2020-09-03 09:37:36 +00:00
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common: VirtioCommon,
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2020-03-20 03:43:17 +00:00
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id: String,
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resize: VirtioBalloonResize,
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config: Arc<Mutex<VirtioBalloonConfig>>,
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2020-08-18 02:58:13 +00:00
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seccomp_action: SeccompAction,
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2020-03-20 03:43:17 +00:00
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}
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impl Balloon {
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// Create a new virtio-balloon.
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2020-08-18 02:58:13 +00:00
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pub fn new(id: String, size: u64, seccomp_action: SeccompAction) -> io::Result<Self> {
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2020-03-20 03:43:17 +00:00
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let avail_features = 1u64 << VIRTIO_F_VERSION_1;
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|
2020-06-23 09:52:30 +00:00
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let mut config = VirtioBalloonConfig::default();
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config.num_pages = (size >> PAGE_SHIFT) as u32;
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2020-03-20 03:43:17 +00:00
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Ok(Balloon {
|
2020-09-03 09:37:36 +00:00
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common: VirtioCommon {
|
2020-09-04 08:37:37 +00:00
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device_type: VirtioDeviceType::TYPE_BALLOON as u32,
|
2020-09-03 09:37:36 +00:00
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avail_features,
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2020-09-04 08:37:37 +00:00
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paused_sync: Some(Arc::new(Barrier::new(2))),
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queue_sizes: QUEUE_SIZES.to_vec(),
|
2020-09-03 15:56:32 +00:00
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|
..Default::default()
|
2020-09-03 09:37:36 +00:00
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},
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2020-03-20 03:43:17 +00:00
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id,
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resize: VirtioBalloonResize::new()?,
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config: Arc::new(Mutex::new(config)),
|
2020-08-18 02:58:13 +00:00
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seccomp_action,
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2020-03-20 03:43:17 +00:00
|
|
|
})
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|
|
|
}
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pub fn resize(&self, size: u64) -> Result<(), Error> {
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self.resize.work(size)
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|
|
}
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|
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|
}
|
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|
|
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|
|
|
impl Drop for Balloon {
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|
|
|
fn drop(&mut self) {
|
2020-09-04 08:37:37 +00:00
|
|
|
if let Some(kill_evt) = self.common.kill_evt.take() {
|
2020-03-20 03:43:17 +00:00
|
|
|
// Ignore the result because there is nothing we can do about it.
|
|
|
|
let _ = kill_evt.write(1);
|
|
|
|
}
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|
|
|
}
|
|
|
|
}
|
|
|
|
|
|
|
|
impl VirtioDevice for Balloon {
|
|
|
|
fn device_type(&self) -> u32 {
|
2020-09-04 08:37:37 +00:00
|
|
|
self.common.device_type
|
2020-03-20 03:43:17 +00:00
|
|
|
}
|
|
|
|
|
|
|
|
fn queue_max_sizes(&self) -> &[u16] {
|
2020-09-04 08:37:37 +00:00
|
|
|
&self.common.queue_sizes
|
2020-03-20 03:43:17 +00:00
|
|
|
}
|
|
|
|
|
|
|
|
fn features(&self) -> u64 {
|
2020-09-03 09:37:36 +00:00
|
|
|
self.common.avail_features
|
2020-03-20 03:43:17 +00:00
|
|
|
}
|
|
|
|
|
|
|
|
fn ack_features(&mut self, value: u64) {
|
2020-09-03 09:37:36 +00:00
|
|
|
self.common.ack_features(value)
|
2020-03-20 03:43:17 +00:00
|
|
|
}
|
|
|
|
|
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 {
|
2020-09-04 08:37:37 +00:00
|
|
|
self.common.activate(&queues, &queue_evts, &interrupt_cb)?;
|
|
|
|
let kill_evt = self
|
|
|
|
.common
|
|
|
|
.kill_evt
|
|
|
|
.as_ref()
|
|
|
|
.unwrap()
|
|
|
|
.try_clone()
|
2020-03-20 03:43:17 +00:00
|
|
|
.map_err(|e| {
|
2020-09-04 08:37:37 +00:00
|
|
|
error!("failed to clone kill_evt eventfd: {}", e);
|
2020-03-20 03:43:17 +00:00
|
|
|
ActivateError::BadActivate
|
|
|
|
})?;
|
2020-09-04 08:37:37 +00:00
|
|
|
let pause_evt = self
|
|
|
|
.common
|
|
|
|
.pause_evt
|
|
|
|
.as_ref()
|
|
|
|
.unwrap()
|
|
|
|
.try_clone()
|
2020-03-20 03:43:17 +00:00
|
|
|
.map_err(|e| {
|
2020-09-04 08:37:37 +00:00
|
|
|
error!("failed to clone pause_evt eventfd: {}", e);
|
2020-03-20 03:43:17 +00:00
|
|
|
ActivateError::BadActivate
|
|
|
|
})?;
|
|
|
|
|
|
|
|
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,
|
|
|
|
};
|
|
|
|
|
2020-09-04 08:37:37 +00:00
|
|
|
let paused = self.common.paused.clone();
|
|
|
|
let paused_sync = self.common.paused_sync.clone();
|
2020-03-20 03:43:17 +00:00
|
|
|
let mut epoll_threads = Vec::new();
|
2020-08-18 02:58:13 +00:00
|
|
|
let virtio_balloon_seccomp_filter =
|
|
|
|
get_seccomp_filter(&self.seccomp_action, Thread::VirtioBalloon)
|
|
|
|
.map_err(ActivateError::CreateSeccompFilter)?;
|
2020-03-20 03:43:17 +00:00
|
|
|
thread::Builder::new()
|
|
|
|
.name("virtio_balloon".to_string())
|
2020-08-17 19:45:17 +00:00
|
|
|
.spawn(move || {
|
2020-08-18 02:58:13 +00:00
|
|
|
if let Err(e) = SeccompFilter::apply(virtio_balloon_seccomp_filter) {
|
|
|
|
error!("Error applying seccomp filter: {:?}", e);
|
2020-09-04 08:37:37 +00:00
|
|
|
} else if let Err(e) = handler.run(paused, paused_sync.unwrap()) {
|
2020-08-17 19:45:17 +00:00
|
|
|
error!("Error running worker: {:?}", e);
|
|
|
|
}
|
|
|
|
})
|
2020-03-20 03:43:17 +00:00
|
|
|
.map(|thread| epoll_threads.push(thread))
|
|
|
|
.map_err(|e| {
|
|
|
|
error!("failed to clone virtio-balloon epoll thread: {}", e);
|
|
|
|
ActivateError::BadActivate
|
|
|
|
})?;
|
2020-09-04 08:37:37 +00:00
|
|
|
self.common.epoll_threads = Some(epoll_threads);
|
2020-03-20 03:43:17 +00:00
|
|
|
|
|
|
|
Ok(())
|
|
|
|
}
|
|
|
|
|
|
|
|
fn reset(&mut self) -> Option<(Arc<dyn VirtioInterrupt>, Vec<EventFd>)> {
|
2020-09-04 08:37:37 +00:00
|
|
|
self.common.reset()
|
|
|
|
}
|
|
|
|
}
|
2020-03-20 03:43:17 +00:00
|
|
|
|
2020-09-04 08:37:37 +00:00
|
|
|
impl Pausable for Balloon {
|
|
|
|
fn pause(&mut self) -> result::Result<(), MigratableError> {
|
|
|
|
self.common.pause()
|
|
|
|
}
|
2020-03-20 03:43:17 +00:00
|
|
|
|
2020-09-04 08:37:37 +00:00
|
|
|
fn resume(&mut self) -> result::Result<(), MigratableError> {
|
|
|
|
self.common.resume()
|
2020-03-20 03:43:17 +00:00
|
|
|
}
|
|
|
|
}
|
|
|
|
|
|
|
|
impl Snapshottable for Balloon {
|
|
|
|
fn id(&self) -> String {
|
|
|
|
self.id.clone()
|
|
|
|
}
|
|
|
|
}
|
|
|
|
impl Transportable for Balloon {}
|
|
|
|
impl Migratable for Balloon {}
|