cloud-hypervisor/virtio-devices/src/mem.rs
Rob Bradford c89095ab85 virtio-devices: Report events for virtio device activation and reset
Signed-off-by: Rob Bradford <robert.bradford@intel.com>
2021-02-18 16:15:13 +00:00

900 lines
28 KiB
Rust

// 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::Error as DeviceError;
use super::{
ActivateError, ActivateResult, DescriptorChain, EpollHelper, EpollHelperError,
EpollHelperHandler, Queue, VirtioCommon, VirtioDevice, VirtioDeviceType,
EPOLL_HELPER_EVENT_LAST, VIRTIO_F_VERSION_1,
};
use crate::seccomp_filters::{get_seccomp_filter, Thread};
use crate::{VirtioInterrupt, VirtioInterruptType};
use anyhow::anyhow;
use libc::EFD_NONBLOCK;
use seccomp::{SeccompAction, SeccompFilter};
use std::io;
use std::mem::size_of;
use std::os::unix::io::{AsRawFd, RawFd};
use std::result;
use std::sync::atomic::{AtomicBool, AtomicU64, Ordering};
use std::sync::mpsc;
use std::sync::{Arc, Barrier, Mutex};
use std::thread;
use vm_memory::{
Address, ByteValued, Bytes, GuestAddress, GuestAddressSpace, GuestMemoryAtomic,
GuestMemoryError, GuestMemoryMmap, GuestMemoryRegion, GuestRegionMmap,
};
use vm_migration::{Migratable, MigratableError, Pausable, Snapshottable, Transportable};
use vmm_sys_util::eventfd::EventFd;
const QUEUE_SIZE: u16 = 128;
const QUEUE_SIZES: &[u16] = &[QUEUE_SIZE];
// 128MiB is the standard memory block size in Linux. A virtio-mem region must
// be aligned on this size, and the region size must be a multiple of it.
pub const VIRTIO_MEM_ALIGN_SIZE: u64 = 128 << 20;
// Use 2 MiB alignment so transparent hugepages can be used by KVM.
const VIRTIO_MEM_DEFAULT_BLOCK_SIZE: u64 = 2 << 20;
// Request processed successfully, applicable for
// - VIRTIO_MEM_REQ_PLUG
// - VIRTIO_MEM_REQ_UNPLUG
// - VIRTIO_MEM_REQ_UNPLUG_ALL
// - VIRTIO_MEM_REQ_STATE
const VIRTIO_MEM_RESP_ACK: u16 = 0;
// Request denied - e.g. trying to plug more than requested, applicable for
// - VIRTIO_MEM_REQ_PLUG
const VIRTIO_MEM_RESP_NACK: u16 = 1;
// Request cannot be processed right now, try again later, applicable for
// - VIRTIO_MEM_REQ_PLUG
// - VIRTIO_MEM_REQ_UNPLUG
// - VIRTIO_MEM_REQ_UNPLUG_ALL
#[allow(unused)]
const VIRTIO_MEM_RESP_BUSY: u16 = 2;
// Error in request (e.g. addresses/alignment), applicable for
// - VIRTIO_MEM_REQ_PLUG
// - VIRTIO_MEM_REQ_UNPLUG
// - VIRTIO_MEM_REQ_STATE
const VIRTIO_MEM_RESP_ERROR: u16 = 3;
// State of memory blocks is "plugged"
const VIRTIO_MEM_STATE_PLUGGED: u16 = 0;
// State of memory blocks is "unplugged"
const VIRTIO_MEM_STATE_UNPLUGGED: u16 = 1;
// State of memory blocks is "mixed"
const VIRTIO_MEM_STATE_MIXED: u16 = 2;
// request to plug memory blocks
const VIRTIO_MEM_REQ_PLUG: u16 = 0;
// request to unplug memory blocks
const VIRTIO_MEM_REQ_UNPLUG: u16 = 1;
// request to unplug all blocks and shrink the usable size
const VIRTIO_MEM_REQ_UNPLUG_ALL: u16 = 2;
// request information about the plugged state of memory blocks
const VIRTIO_MEM_REQ_STATE: u16 = 3;
// Get resize event.
const RESIZE_EVENT: u16 = EPOLL_HELPER_EVENT_LAST + 1;
// New descriptors are pending on the virtio queue.
const QUEUE_AVAIL_EVENT: u16 = EPOLL_HELPER_EVENT_LAST + 2;
// Virtio features
const VIRTIO_MEM_F_ACPI_PXM: u8 = 0;
#[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 gave us a read only descriptor that protocol says to write to.
UnexpectedReadOnlyDescriptor,
// Guest gave us too few descriptors in a descriptor chain.
DescriptorChainTooShort,
// Guest gave us a buffer that was too short to use.
BufferLengthTooSmall,
// Guest sent us invalid request.
InvalidRequest,
// 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
ResizeError(anyhow::Error),
// Fail to resize trigger
ResizeTriggerFail(DeviceError),
// Invalid configuration
ValidateError(anyhow::Error),
// Failed discarding memory range
DiscardMemoryRange(std::io::Error),
}
#[repr(C)]
#[derive(Copy, Clone, Debug, Default)]
struct VirtioMemReq {
req_type: u16,
padding: [u16; 3],
addr: u64,
nb_blocks: u16,
padding_1: [u16; 3],
}
// Safe because it only has data and has no implicit padding.
unsafe impl ByteValued for VirtioMemReq {}
#[repr(C)]
#[derive(Copy, Clone, Debug, Default)]
struct VirtioMemResp {
resp_type: u16,
padding: [u16; 3],
state: u16,
}
// Safe because it only has data and has no implicit padding.
unsafe impl ByteValued for VirtioMemResp {}
#[repr(C)]
#[derive(Copy, Clone, Debug, Default)]
struct VirtioMemConfig {
// Block size and alignment. Cannot change.
block_size: u64,
// Valid with VIRTIO_MEM_F_ACPI_PXM. Cannot change.
node_id: u16,
padding: [u8; 6],
// Start address of the memory region. Cannot change.
addr: u64,
// Region size (maximum). Cannot change.
region_size: u64,
// Currently usable region size. Can grow up to region_size. Can
// shrink due to VIRTIO_MEM_REQ_UNPLUG_ALL (in which case no config
// update will be sent).
usable_region_size: u64,
// Currently used size. Changes due to plug/unplug requests, but no
// config updates will be sent.
plugged_size: u64,
// Requested size. New plug requests cannot exceed it. Can change.
requested_size: u64,
}
// Safe because it only has data and has no implicit padding.
unsafe impl ByteValued for VirtioMemConfig {}
impl VirtioMemConfig {
fn validate(&self) -> result::Result<(), Error> {
if self.addr % self.block_size != 0 {
return Err(Error::ValidateError(anyhow!(
"addr 0x{:x} is not aligned on block_size 0x{:x}",
self.addr,
self.block_size
)));
}
if self.region_size % self.block_size != 0 {
return Err(Error::ValidateError(anyhow!(
"region_size 0x{:x} is not aligned on block_size 0x{:x}",
self.region_size,
self.block_size
)));
}
if self.usable_region_size % self.block_size != 0 {
return Err(Error::ValidateError(anyhow!(
"usable_region_size 0x{:x} is not aligned on block_size 0x{:x}",
self.usable_region_size,
self.block_size
)));
}
if self.plugged_size % self.block_size != 0 {
return Err(Error::ValidateError(anyhow!(
"plugged_size 0x{:x} is not aligned on block_size 0x{:x}",
self.plugged_size,
self.block_size
)));
}
if self.requested_size % self.block_size != 0 {
return Err(Error::ValidateError(anyhow!(
"requested_size 0x{:x} is not aligned on block_size 0x{:x}",
self.requested_size,
self.block_size
)));
}
Ok(())
}
fn resize(&mut self, size: u64) -> result::Result<(), Error> {
if self.requested_size == size {
return Err(Error::ResizeError(anyhow!(
"new size 0x{:x} and requested_size are identical",
size
)));
} else if size > self.region_size {
return Err(Error::ResizeError(anyhow!(
"new size 0x{:x} is bigger than region_size 0x{:x}",
size,
self.region_size
)));
} else if size % (self.block_size as u64) != 0 {
return Err(Error::ResizeError(anyhow!(
"new size 0x{:x} is not aligned on block_size 0x{:x}",
size,
self.block_size
)));
}
self.requested_size = size;
Ok(())
}
fn is_valid_range(&self, addr: u64, size: u64) -> bool {
// Start address must be aligned on block_size, the size must be
// greater than 0, and all blocks covered by the request must be
// in the usable region.
if addr % self.block_size != 0
|| size == 0
|| (addr < self.addr || addr + size >= self.addr + self.usable_region_size)
{
return false;
}
true
}
}
struct Request {
req: VirtioMemReq,
status_addr: GuestAddress,
}
impl Request {
fn parse(
avail_desc: &DescriptorChain,
mem: &GuestMemoryMmap,
) -> result::Result<Request, Error> {
// The head contains the request type which MUST be readable.
if avail_desc.is_write_only() {
return Err(Error::UnexpectedWriteOnlyDescriptor);
}
if avail_desc.len as usize != size_of::<VirtioMemReq>() {
return Err(Error::InvalidRequest);
}
let req: VirtioMemReq = mem.read_obj(avail_desc.addr).map_err(Error::GuestMemory)?;
let status_desc = avail_desc
.next_descriptor()
.ok_or(Error::DescriptorChainTooShort)?;
// The status MUST always be writable
if !status_desc.is_write_only() {
return Err(Error::UnexpectedReadOnlyDescriptor);
}
if (status_desc.len as usize) < size_of::<VirtioMemResp>() {
return Err(Error::BufferLengthTooSmall);
}
Ok(Request {
req,
status_addr: status_desc.addr,
})
}
fn send_response(&self, mem: &GuestMemoryMmap, resp_type: u16, state: u16) -> u32 {
let resp = VirtioMemResp {
resp_type,
state,
..Default::default()
};
match mem.write_obj(resp, self.status_addr) {
Ok(_) => size_of::<VirtioMemResp>() as u32,
Err(e) => {
error!("bad guest memory address: {}", e);
0
}
}
}
}
pub struct ResizeSender {
size: Arc<AtomicU64>,
tx: mpsc::Sender<Result<(), Error>>,
evt: EventFd,
}
impl ResizeSender {
fn size(&self) -> u64 {
self.size.load(Ordering::Acquire)
}
fn send(&self, r: Result<(), Error>) -> Result<(), mpsc::SendError<Result<(), Error>>> {
self.tx.send(r)
}
}
impl Clone for ResizeSender {
fn clone(&self) -> Self {
ResizeSender {
size: self.size.clone(),
tx: self.tx.clone(),
evt: self
.evt
.try_clone()
.expect("Failed cloning EventFd from ResizeSender"),
}
}
}
pub struct Resize {
size: Arc<AtomicU64>,
tx: mpsc::Sender<Result<(), Error>>,
rx: mpsc::Receiver<Result<(), Error>>,
evt: EventFd,
}
impl Resize {
pub fn new() -> io::Result<Self> {
let (tx, rx) = mpsc::channel();
Ok(Resize {
size: Arc::new(AtomicU64::new(0)),
tx,
rx,
evt: EventFd::new(EFD_NONBLOCK)?,
})
}
pub fn new_resize_sender(&self) -> Result<ResizeSender, Error> {
Ok(ResizeSender {
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::Release);
self.evt.write(1).map_err(Error::EventFdWriteFail)?;
self.rx.recv().map_err(Error::MpscRecvFail)?
}
}
struct BlocksState(Vec<bool>);
impl BlocksState {
fn is_range_state(&self, first_block_index: usize, nb_blocks: u16, plug: bool) -> bool {
for state in self
.0
.iter()
.skip(first_block_index)
.take(nb_blocks as usize)
{
if *state != plug {
return false;
}
}
true
}
fn set_range(&mut self, first_block_index: usize, nb_blocks: u16, plug: bool) {
for state in self
.0
.iter_mut()
.skip(first_block_index)
.take(nb_blocks as usize)
{
*state = plug;
}
}
}
struct MemEpollHandler {
host_addr: u64,
host_fd: Option<RawFd>,
blocks_state: BlocksState,
config: Arc<Mutex<VirtioMemConfig>>,
resize: ResizeSender,
queue: Queue,
mem: GuestMemoryAtomic<GuestMemoryMmap>,
interrupt_cb: Arc<dyn VirtioInterrupt>,
queue_evt: EventFd,
kill_evt: EventFd,
pause_evt: EventFd,
hugepages: bool,
}
impl MemEpollHandler {
fn discard_memory_range(&self, offset: u64, size: u64) -> Result<(), Error> {
// Use fallocate if the memory region is backed by a file.
if let Some(fd) = self.host_fd {
let res = unsafe {
libc::fallocate64(
fd,
libc::FALLOC_FL_PUNCH_HOLE | libc::FALLOC_FL_KEEP_SIZE,
offset as libc::off64_t,
size as libc::off64_t,
)
};
if res != 0 {
let err = io::Error::last_os_error();
error!("Deallocating file space failed: {}", err);
return Err(Error::DiscardMemoryRange(err));
}
}
// Only use madvise if the memory region is not allocated with
// hugepages.
if !self.hugepages {
let res = unsafe {
libc::madvise(
(self.host_addr + offset) as *mut libc::c_void,
size as libc::size_t,
libc::MADV_DONTNEED,
)
};
if res != 0 {
let err = io::Error::last_os_error();
error!("Advising kernel about pages range failed: {}", err);
return Err(Error::DiscardMemoryRange(err));
}
}
Ok(())
}
fn state_change_request(&mut self, addr: u64, nb_blocks: u16, plug: bool) -> u16 {
let mut config = self.config.lock().unwrap();
let size: u64 = nb_blocks as u64 * config.block_size;
if plug && (config.plugged_size + size > config.requested_size) {
return VIRTIO_MEM_RESP_NACK;
}
if !config.is_valid_range(addr, size) {
return VIRTIO_MEM_RESP_ERROR;
}
let offset = addr - config.addr;
let first_block_index = (offset / config.block_size) as usize;
if !self
.blocks_state
.is_range_state(first_block_index, nb_blocks, !plug)
{
return VIRTIO_MEM_RESP_ERROR;
}
if !plug {
if let Err(e) = self.discard_memory_range(offset, size) {
error!("failed discarding memory range: {:?}", e);
return VIRTIO_MEM_RESP_ERROR;
}
}
self.blocks_state
.set_range(first_block_index, nb_blocks, plug);
if plug {
config.plugged_size += size;
} else {
config.plugged_size -= size;
}
VIRTIO_MEM_RESP_ACK
}
fn unplug_all(&mut self) -> u16 {
let mut config = self.config.lock().unwrap();
if let Err(e) = self.discard_memory_range(0, config.region_size) {
error!("failed discarding memory range: {:?}", e);
return VIRTIO_MEM_RESP_ERROR;
}
self.blocks_state
.set_range(0, (config.region_size / config.block_size) as u16, false);
config.plugged_size = 0;
VIRTIO_MEM_RESP_ACK
}
fn state_request(&self, addr: u64, nb_blocks: u16) -> (u16, u16) {
let config = self.config.lock().unwrap();
let size: u64 = nb_blocks as u64 * config.block_size;
let resp_type = if config.is_valid_range(addr, size) {
VIRTIO_MEM_RESP_ACK
} else {
VIRTIO_MEM_RESP_ERROR
};
let offset = addr - config.addr;
let first_block_index = (offset / config.block_size) as usize;
let resp_state = if self
.blocks_state
.is_range_state(first_block_index, nb_blocks, true)
{
VIRTIO_MEM_STATE_PLUGGED
} else if self
.blocks_state
.is_range_state(first_block_index, nb_blocks, false)
{
VIRTIO_MEM_STATE_UNPLUGGED
} else {
VIRTIO_MEM_STATE_MIXED
};
(resp_type, resp_state)
}
fn signal(&self, int_type: &VirtioInterruptType) -> result::Result<(), DeviceError> {
self.interrupt_cb
.trigger(int_type, Some(&self.queue))
.map_err(|e| {
error!("Failed to signal used queue: {:?}", e);
DeviceError::FailedSignalingUsedQueue(e)
})
}
fn process_queue(&mut self) -> bool {
let mut request_list = Vec::new();
let mut used_count = 0;
let mem = self.mem.memory();
for avail_desc in self.queue.iter(&mem) {
request_list.push((avail_desc.index, Request::parse(&avail_desc, &mem)));
}
for (desc_index, request) in request_list.iter() {
let len = match request {
Err(e) => {
error!("failed parse VirtioMemReq: {:?}", e);
0
}
Ok(r) => match r.req.req_type {
VIRTIO_MEM_REQ_PLUG => {
let resp_type =
self.state_change_request(r.req.addr, r.req.nb_blocks, true);
r.send_response(&mem, resp_type, 0u16)
}
VIRTIO_MEM_REQ_UNPLUG => {
let resp_type =
self.state_change_request(r.req.addr, r.req.nb_blocks, false);
r.send_response(&mem, resp_type, 0u16)
}
VIRTIO_MEM_REQ_UNPLUG_ALL => {
let resp_type = self.unplug_all();
r.send_response(&mem, resp_type, 0u16)
}
VIRTIO_MEM_REQ_STATE => {
let (resp_type, resp_state) =
self.state_request(r.req.addr, r.req.nb_blocks);
r.send_response(&mem, resp_type, resp_state)
}
_ => {
error!("VirtioMemReq unknown request type {:?}", r.req.req_type);
0
}
},
};
self.queue.add_used(&mem, *desc_index, len);
used_count += 1;
}
used_count > 0
}
fn run(
&mut self,
paused: Arc<AtomicBool>,
paused_sync: Arc<Barrier>,
) -> result::Result<(), EpollHelperError> {
let mut helper = EpollHelper::new(&self.kill_evt, &self.pause_evt)?;
helper.add_event(self.resize.evt.as_raw_fd(), RESIZE_EVENT)?;
helper.add_event(self.queue_evt.as_raw_fd(), QUEUE_AVAIL_EVENT)?;
helper.run(paused, paused_sync, self)?;
Ok(())
}
}
impl EpollHelperHandler for MemEpollHandler {
fn handle_event(&mut self, _helper: &mut EpollHelper, event: &epoll::Event) -> bool {
let ev_type = event.data as u16;
match ev_type {
RESIZE_EVENT => {
if let Err(e) = self.resize.evt.read() {
error!("Failed to get resize event: {:?}", e);
return true;
} else {
let size = self.resize.size();
let mut config = self.config.lock().unwrap();
let mut signal_error = false;
let mut r = config.resize(size);
r = match r {
Err(e) => Err(e),
_ => match self.signal(&VirtioInterruptType::Config) {
Err(e) => {
signal_error = true;
Err(Error::ResizeTriggerFail(e))
}
_ => Ok(()),
},
};
if let Err(e) = self.resize.send(r) {
error!("Sending \"resize\" response: {:?}", e);
return true;
}
if signal_error {
return true;
}
}
}
QUEUE_AVAIL_EVENT => {
if let Err(e) = self.queue_evt.read() {
error!("Failed to get queue event: {:?}", e);
return true;
} else if self.process_queue() {
if let Err(e) = self.signal(&VirtioInterruptType::Queue) {
error!("Failed to signal used queue: {:?}", e);
return true;
}
}
}
_ => {
error!("Unexpected event: {}", ev_type);
return true;
}
}
false
}
}
// Virtio device for exposing entropy to the guest OS through virtio.
pub struct Mem {
common: VirtioCommon,
id: String,
resize: ResizeSender,
host_addr: u64,
host_fd: Option<RawFd>,
config: Arc<Mutex<VirtioMemConfig>>,
seccomp_action: SeccompAction,
hugepages: bool,
}
impl Mem {
// Create a new virtio-mem device.
pub fn new(
id: String,
region: &Arc<GuestRegionMmap>,
resize: ResizeSender,
seccomp_action: SeccompAction,
numa_node_id: Option<u16>,
initial_size: u64,
hugepages: bool,
) -> io::Result<Mem> {
let region_len = region.len();
if region_len != region_len / VIRTIO_MEM_ALIGN_SIZE * VIRTIO_MEM_ALIGN_SIZE {
return Err(io::Error::new(
io::ErrorKind::Other,
format!(
"Virtio-mem size is not aligned with {}",
VIRTIO_MEM_ALIGN_SIZE
),
));
}
let mut avail_features = 1u64 << VIRTIO_F_VERSION_1;
let mut config = VirtioMemConfig {
block_size: VIRTIO_MEM_DEFAULT_BLOCK_SIZE,
addr: region.start_addr().raw_value(),
region_size: region.len(),
usable_region_size: region.len(),
plugged_size: 0,
requested_size: 0,
..Default::default()
};
if initial_size != 0 {
config.resize(initial_size).map_err(|e| {
io::Error::new(
io::ErrorKind::Other,
format!(
"Failed to resize virtio-mem configuration to {}: {:?}",
initial_size, e
),
)
})?;
}
if let Some(node_id) = numa_node_id {
avail_features |= 1u64 << VIRTIO_MEM_F_ACPI_PXM;
config.node_id = node_id;
}
// Make sure the virtio-mem configuration complies with the
// specification.
config.validate().map_err(|e| {
io::Error::new(
io::ErrorKind::Other,
format!("Invalid virtio-mem configuration: {:?}", e),
)
})?;
let host_fd = region
.file_offset()
.map(|f_offset| f_offset.file().as_raw_fd());
Ok(Mem {
common: VirtioCommon {
device_type: VirtioDeviceType::TYPE_MEM as u32,
avail_features,
paused_sync: Some(Arc::new(Barrier::new(2))),
queue_sizes: QUEUE_SIZES.to_vec(),
min_queues: 1,
..Default::default()
},
id,
resize,
host_addr: region.as_ptr() as u64,
host_fd,
config: Arc::new(Mutex::new(config)),
seccomp_action,
hugepages,
})
}
}
impl Drop for Mem {
fn drop(&mut self) {
if let Some(kill_evt) = self.common.kill_evt.take() {
// Ignore the result because there is nothing we can do about it.
let _ = kill_evt.write(1);
}
}
}
impl VirtioDevice for Mem {
fn device_type(&self) -> u32 {
self.common.device_type
}
fn queue_max_sizes(&self) -> &[u16] {
&self.common.queue_sizes
}
fn features(&self) -> u64 {
self.common.avail_features
}
fn ack_features(&mut self, value: u64) {
self.common.ack_features(value)
}
fn read_config(&self, offset: u64, data: &mut [u8]) {
self.read_config_from_slice(self.config.lock().unwrap().as_slice(), offset, data);
}
fn activate(
&mut self,
mem: GuestMemoryAtomic<GuestMemoryMmap>,
interrupt_cb: Arc<dyn VirtioInterrupt>,
mut queues: Vec<Queue>,
mut queue_evts: Vec<EventFd>,
) -> ActivateResult {
self.common.activate(&queues, &queue_evts, &interrupt_cb)?;
let kill_evt = self
.common
.kill_evt
.as_ref()
.unwrap()
.try_clone()
.map_err(|e| {
error!("failed to clone kill_evt eventfd: {}", e);
ActivateError::BadActivate
})?;
let pause_evt = self
.common
.pause_evt
.as_ref()
.unwrap()
.try_clone()
.map_err(|e| {
error!("failed to clone pause_evt eventfd: {}", e);
ActivateError::BadActivate
})?;
let config = self.config.lock().unwrap();
let mut handler = MemEpollHandler {
host_addr: self.host_addr,
host_fd: self.host_fd,
blocks_state: BlocksState(vec![
false;
(config.region_size / config.block_size) as usize
]),
config: self.config.clone(),
resize: self.resize.clone(),
queue: queues.remove(0),
mem,
interrupt_cb,
queue_evt: queue_evts.remove(0),
kill_evt,
pause_evt,
hugepages: self.hugepages,
};
handler
.discard_memory_range(0, config.region_size)
.map_err(|e| {
error!("failed discarding memory range: {:?}", e);
ActivateError::BadActivate
})?;
let paused = self.common.paused.clone();
let paused_sync = self.common.paused_sync.clone();
let mut epoll_threads = Vec::new();
// Retrieve seccomp filter for virtio_mem thread
let virtio_mem_seccomp_filter = get_seccomp_filter(&self.seccomp_action, Thread::VirtioMem)
.map_err(ActivateError::CreateSeccompFilter)?;
thread::Builder::new()
.name(self.id.clone())
.spawn(move || {
if let Err(e) = SeccompFilter::apply(virtio_mem_seccomp_filter) {
error!("Error applying seccomp filter: {:?}", e);
} else if let Err(e) = handler.run(paused, paused_sync.unwrap()) {
error!("Error running worker: {:?}", e);
}
})
.map(|thread| epoll_threads.push(thread))
.map_err(|e| {
error!("failed to clone virtio-mem epoll thread: {}", e);
ActivateError::BadActivate
})?;
self.common.epoll_threads = Some(epoll_threads);
event!("virtio-device", "activated", "id", &self.id);
Ok(())
}
fn reset(&mut self) -> Option<Arc<dyn VirtioInterrupt>> {
let result = self.common.reset();
event!("virtio-device", "reset", "id", &self.id);
result
}
}
impl Pausable for Mem {
fn pause(&mut self) -> result::Result<(), MigratableError> {
self.common.pause()
}
fn resume(&mut self) -> result::Result<(), MigratableError> {
self.common.resume()
}
}
impl Snapshottable for Mem {
fn id(&self) -> String {
self.id.clone()
}
}
impl Transportable for Mem {}
impl Migratable for Mem {}