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Following the new design proposal to improve the restore codepath when migrating a VM, all virtio devices are supplied with an optional state they can use to restore from. The restore() implementation every device was providing has been removed in order to prevent from going through the restoration twice. Here is the list of devices now following the new restore design: - Block (virtio-block) - Net (virtio-net) - Rng (virtio-rng) - Fs (vhost-user-fs) - Blk (vhost-user-block) - Net (vhost-user-net) - Pmem (virtio-pmem) - Vsock (virtio-vsock) - Mem (virtio-mem) - Balloon (virtio-balloon) - Watchdog (virtio-watchdog) - Vdpa (vDPA) - Console (virtio-console) - Iommu (virtio-iommu) Signed-off-by: Sebastien Boeuf <sebastien.boeuf@intel.com>
130 lines
4.1 KiB
Rust
130 lines
4.1 KiB
Rust
// Copyright 2018 The Chromium OS Authors. All rights reserved.
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// Use of this source code is governed by a BSD-style license that can be
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// found in the LICENSE file.
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//
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// Copyright © 2022 Intel Corporation
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//
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// SPDX-License-Identifier: Apache-2.0 AND BSD-3-Clause
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#![no_main]
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use block_util::{async_io::DiskFile, raw_sync::RawFileDiskSync};
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use libfuzzer_sys::fuzz_target;
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use seccompiler::SeccompAction;
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use std::ffi;
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use std::fs::File;
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use std::io;
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use std::os::unix::io::{AsRawFd, FromRawFd, RawFd};
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use std::path::PathBuf;
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use std::sync::Arc;
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use virtio_devices::{Block, VirtioDevice, VirtioInterrupt, VirtioInterruptType};
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use virtio_queue::{Queue, QueueT};
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use vm_memory::{bitmap::AtomicBitmap, Bytes, GuestAddress, GuestMemoryAtomic};
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use vmm_sys_util::eventfd::{EventFd, EFD_NONBLOCK};
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type GuestMemoryMmap = vm_memory::GuestMemoryMmap<AtomicBitmap>;
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const QUEUE_DATA_SIZE: usize = 4;
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const MEM_SIZE: usize = 256 * 1024 * 1024;
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// Max entries in the queue.
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const QUEUE_SIZE: u16 = 256;
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// Guest physical address for descriptor table.
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const DESC_TABLE_ADDR: u64 = 0;
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const DESC_TABLE_SIZE: u64 = 16_u64 * QUEUE_SIZE as u64;
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// Guest physical address for available ring
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const AVAIL_RING_ADDR: u64 = DESC_TABLE_ADDR + DESC_TABLE_SIZE;
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const AVAIL_RING_SIZE: u64 = 6_u64 + 2 * QUEUE_SIZE as u64;
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// Guest physical address for used ring (requires to 4-bytes aligned)
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const USED_RING_ADDR: u64 = (AVAIL_RING_ADDR + AVAIL_RING_SIZE + 3) & !3_u64;
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fuzz_target!(|bytes| {
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if bytes.len() < QUEUE_DATA_SIZE || bytes.len() > (QUEUE_DATA_SIZE + MEM_SIZE) {
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return;
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}
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let queue_data = &bytes[..QUEUE_DATA_SIZE];
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let mem_bytes = &bytes[QUEUE_DATA_SIZE..];
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// Create a virtio-block device backed by a synchronous raw file
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let shm = memfd_create(&ffi::CString::new("fuzz").unwrap(), 0).unwrap();
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let disk_file: File = unsafe { File::from_raw_fd(shm) };
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let qcow_disk = Box::new(RawFileDiskSync::new(disk_file)) as Box<dyn DiskFile>;
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let mut block = Block::new(
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"tmp".to_owned(),
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qcow_disk,
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PathBuf::from(""),
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false,
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false,
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2,
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256,
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SeccompAction::Allow,
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None,
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EventFd::new(EFD_NONBLOCK).unwrap(),
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None,
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)
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.unwrap();
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// Setup the virt queue with the input bytes
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let q = setup_virt_queue(queue_data.try_into().unwrap());
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// Setup the guest memory with the input bytes
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let mem = GuestMemoryMmap::from_ranges(&[(GuestAddress(0), MEM_SIZE)]).unwrap();
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if mem.write_slice(mem_bytes, GuestAddress(0 as u64)).is_err() {
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return;
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}
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let guest_memory = GuestMemoryAtomic::new(mem);
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let evt = EventFd::new(0).unwrap();
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let queue_evt = unsafe { EventFd::from_raw_fd(libc::dup(evt.as_raw_fd())) };
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// Kick the 'queue' event before activate the block device
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queue_evt.write(1).unwrap();
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block
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.activate(
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guest_memory,
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Arc::new(NoopVirtioInterrupt {}),
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vec![(0, q, evt)],
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)
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.ok();
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// Wait for the events to finish and block device worker thread to return
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block.wait_for_epoll_threads();
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});
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fn memfd_create(name: &ffi::CStr, flags: u32) -> Result<RawFd, io::Error> {
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let res = unsafe { libc::syscall(libc::SYS_memfd_create, name.as_ptr(), flags) };
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if res < 0 {
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Err(io::Error::last_os_error())
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} else {
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Ok(res as RawFd)
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}
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}
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pub struct NoopVirtioInterrupt {}
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impl VirtioInterrupt for NoopVirtioInterrupt {
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fn trigger(&self, _int_type: VirtioInterruptType) -> std::result::Result<(), std::io::Error> {
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Ok(())
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}
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}
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fn setup_virt_queue(bytes: &[u8; QUEUE_DATA_SIZE]) -> Queue {
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let mut q = Queue::new(QUEUE_SIZE).unwrap();
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q.set_next_avail(bytes[0] as u16); // 'u8' is enough given the 'QUEUE_SIZE' is small
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q.set_next_used(bytes[1] as u16);
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q.set_event_idx(bytes[2] % 2 != 0);
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q.set_size(bytes[3] as u16 % QUEUE_SIZE);
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q.try_set_desc_table_address(GuestAddress(DESC_TABLE_ADDR))
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.unwrap();
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q.try_set_avail_ring_address(GuestAddress(AVAIL_RING_ADDR))
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.unwrap();
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q.try_set_used_ring_address(GuestAddress(USED_RING_ADDR))
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.unwrap();
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q.set_ready(true);
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q
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}
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