vm-virtio: Add virtio console device for single port operation

The virtio console device is a console for the communication between
the host and guest userspace. It has two parts: the device and the
driver. The console device is implemented here as a virtio-pci device
to the guest. On the other side, the guest OS expected to have a
character device driver which provides an interface to the userspace
applications.

The console device can have multiple ports where each port has one
transmit queue and one receive queue. The current implementation only
supports one port. For data IO communication, one or more empty
buffers are placed in the receive queue for incoming data, and
outgoing characters are placed in the transmit queue. Details spec
can be found from the following link.

https://docs.oasis-open.org/virtio/virtio/v1.1/csprd01/virtio-v1.1-csprd01.pdf#e7

Apart from the console, for the communication between guest and host,
the Cloud Hypervisor has a legacy serial device implemented. However,
the implementation of a console device lets us be independent of legacy
pin-based interrupts without losing the logs and access to the VM.

Signed-off-by: A K M Fazla Mehrab <fazla.mehrab.akm@intel.com>
This commit is contained in:
fazlamehrab 2019-07-22 11:50:56 -07:00 committed by Rob Bradford
parent f98a69f42e
commit 577d44c8eb
3 changed files with 535 additions and 70 deletions

216
Cargo.lock generated
View File

@ -21,7 +21,7 @@ dependencies = [
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"kvm-bindings 0.1.1 (registry+https://github.com/rust-lang/crates.io-index)",
"kvm-ioctls 0.2.0 (git+https://github.com/rust-vmm/kvm-ioctls)",
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@ -53,7 +53,7 @@ name = "atty"
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source = "registry+https://github.com/rust-lang/crates.io-index"
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@ -65,23 +65,22 @@ source = "registry+https://github.com/rust-lang/crates.io-index"
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[[package]]
@ -118,6 +117,15 @@ name = "byteorder"
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@ -190,9 +198,9 @@ dependencies = [
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@ -212,7 +220,7 @@ version = "0.3.3"
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@ -223,7 +231,7 @@ version = "4.0.1"
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@ -231,7 +239,7 @@ name = "failure"
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@ -242,7 +250,7 @@ source = "registry+https://github.com/rust-lang/crates.io-index"
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@ -251,6 +259,15 @@ name = "fuchsia-cprng"
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source = "registry+https://github.com/rust-lang/crates.io-index"
[[package]]
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@ -261,7 +278,7 @@ name = "ipnetwork"
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[[package]]
@ -286,20 +303,23 @@ source = "registry+https://github.com/rust-lang/crates.io-index"
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source = "git+https://github.com/rust-vmm/kvm-ioctls#331eea68b067194a29448c9fa4ba90baaca2be22"
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@ -308,11 +328,11 @@ version = "0.2.11"
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@ -321,9 +341,9 @@ version = "1.0.25"
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@ -367,11 +387,11 @@ name = "net_util"
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@ -393,9 +413,9 @@ source = "registry+https://github.com/rust-lang/crates.io-index"
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@ -406,7 +426,7 @@ dependencies = [
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@ -442,7 +462,7 @@ version = "0.22.0"
source = "registry+https://github.com/rust-lang/crates.io-index"
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@ -483,7 +503,7 @@ name = "pnet_sys"
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@ -493,12 +513,17 @@ name = "pnet_transport"
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@ -512,10 +537,10 @@ name = "qcow"
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@ -533,7 +558,7 @@ version = "0.4.6"
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@ -545,7 +570,7 @@ version = "0.6.5"
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@ -557,6 +582,18 @@ dependencies = [
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@ -566,6 +603,16 @@ dependencies = [
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@ -579,6 +626,14 @@ name = "rand_core"
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@ -587,6 +642,14 @@ dependencies = [
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@ -600,7 +663,7 @@ name = "rand_jitter"
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@ -612,7 +675,7 @@ source = "registry+https://github.com/rust-lang/crates.io-index"
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@ -645,7 +708,7 @@ dependencies = [
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source = "registry+https://github.com/rust-lang/crates.io-index"
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@ -653,7 +716,7 @@ name = "redox_termios"
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@ -664,7 +727,7 @@ dependencies = [
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@ -727,7 +790,7 @@ source = "registry+https://github.com/rust-lang/crates.io-index"
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"checksum synstructure 0.10.2 (registry+https://github.com/rust-lang/crates.io-index)" = "02353edf96d6e4dc81aea2d8490a7e9db177bf8acb0e951c24940bf866cb313f"
"checksum syntex 0.42.2 (registry+https://github.com/rust-lang/crates.io-index)" = "0a30b08a6b383a22e5f6edc127d169670d48f905bb00ca79a00ea3e442ebe317"
"checksum syntex_errors 0.42.0 (registry+https://github.com/rust-lang/crates.io-index)" = "04c48f32867b6114449155b2a82114b86d4b09e1bddb21c47ff104ab9172b646"
"checksum syntex_pos 0.42.0 (registry+https://github.com/rust-lang/crates.io-index)" = "3fd49988e52451813c61fecbe9abb5cfd4e1b7bb6cdbb980a6fbcbab859171a6"
"checksum syntex_syntax 0.42.0 (registry+https://github.com/rust-lang/crates.io-index)" = "7628a0506e8f9666fdabb5f265d0059b059edac9a3f810bda077abb5d826bd8d"
"checksum tempdir 0.3.7 (registry+https://github.com/rust-lang/crates.io-index)" = "15f2b5fb00ccdf689e0149d1b1b3c03fead81c2b37735d812fa8bddbbf41b6d8"
"checksum tempfile 3.0.8 (registry+https://github.com/rust-lang/crates.io-index)" = "7dc4738f2e68ed2855de5ac9cdbe05c9216773ecde4739b2f095002ab03a13ef"
"checksum tempfile 3.1.0 (registry+https://github.com/rust-lang/crates.io-index)" = "7a6e24d9338a0a5be79593e2fa15a648add6138caa803e2d5bc782c371732ca9"
"checksum term 0.4.6 (registry+https://github.com/rust-lang/crates.io-index)" = "fa63644f74ce96fbeb9b794f66aff2a52d601cbd5e80f4b97123e3899f4570f1"
"checksum termion 1.5.3 (registry+https://github.com/rust-lang/crates.io-index)" = "6a8fb22f7cde82c8220e5aeacb3258ed7ce996142c77cba193f203515e26c330"
"checksum textwrap 0.9.0 (registry+https://github.com/rust-lang/crates.io-index)" = "c0b59b6b4b44d867f1370ef1bd91bfb262bf07bf0ae65c202ea2fbc16153b693"
@ -1133,7 +1209,7 @@ dependencies = [
"checksum unicode-xid 0.0.3 (registry+https://github.com/rust-lang/crates.io-index)" = "36dff09cafb4ec7c8cf0023eb0b686cb6ce65499116a12201c9e11840ca01beb"
"checksum unicode-xid 0.1.0 (registry+https://github.com/rust-lang/crates.io-index)" = "fc72304796d0818e357ead4e000d19c9c174ab23dc11093ac919054d20a6a7fc"
"checksum utf8-ranges 1.0.3 (registry+https://github.com/rust-lang/crates.io-index)" = "9d50aa7650df78abf942826607c62468ce18d9019673d4a2ebe1865dbb96ffde"
"checksum vcpkg 0.2.6 (registry+https://github.com/rust-lang/crates.io-index)" = "def296d3eb3b12371b2c7d0e83bfe1403e4db2d7a0bba324a12b21c4ee13143d"
"checksum vcpkg 0.2.7 (registry+https://github.com/rust-lang/crates.io-index)" = "33dd455d0f96e90a75803cfeb7f948768c08d70a6de9a8d2362461935698bf95"
"checksum vec_map 0.8.1 (registry+https://github.com/rust-lang/crates.io-index)" = "05c78687fb1a80548ae3250346c3db86a80a7cdd77bda190189f2d0a0987c81a"
"checksum vm-memory 0.1.0 (git+https://github.com/rust-vmm/vm-memory)" = "<none>"
"checksum vmm-sys-util 0.1.0 (git+https://github.com/rust-vmm/vmm-sys-util)" = "<none>"

386
vm-virtio/src/console.rs Executable file
View File

@ -0,0 +1,386 @@
// Copyright 2019 Intel Corporation. All Rights Reserved.
// SPDX-License-Identifier: Apache-2.0
use epoll;
use libc::EFD_NONBLOCK;
use std;
use std::cmp;
use std::collections::VecDeque;
use std::io;
use std::io::Write;
use std::os::unix::io::AsRawFd;
use std::result;
use std::sync::atomic::{AtomicUsize, Ordering};
use std::sync::{Arc, Mutex};
use std::thread;
use super::Error as DeviceError;
use super::{
ActivateError, ActivateResult, DeviceEventT, Queue, VirtioDevice, VirtioDeviceType,
INTERRUPT_STATUS_USED_RING, VIRTIO_F_VERSION_1,
};
use crate::VirtioInterrupt;
use vm_memory::{Bytes, GuestMemoryMmap};
use vmm_sys_util::EventFd;
const QUEUE_SIZE: u16 = 256;
const NUM_QUEUES: usize = 2;
const QUEUE_SIZES: &[u16] = &[QUEUE_SIZE; NUM_QUEUES];
// New descriptors are pending on the virtio queue.
const INPUT_QUEUE_EVENT: DeviceEventT = 0;
const OUTPUT_QUEUE_EVENT: DeviceEventT = 1;
// Some input from the VMM is ready to be injected into the VM.
const INPUT_EVENT: DeviceEventT = 2;
// The device has been dropped.
const KILL_EVENT: DeviceEventT = 3;
struct ConsoleEpollHandler {
queues: Vec<Queue>,
mem: GuestMemoryMmap,
interrupt_status: Arc<AtomicUsize>,
interrupt_cb: Arc<VirtioInterrupt>,
in_buffer: Arc<Mutex<VecDeque<u8>>>,
out: Box<io::Write + Send>,
input_queue_evt: EventFd,
output_queue_evt: EventFd,
input_evt: EventFd,
kill_evt: EventFd,
}
impl ConsoleEpollHandler {
/*
* Each port of virtio console device has one receive
* queue. One or more empty buffers are placed by the
* dirver in the receive queue for incoming data. Here,
* we place the input data to these empty buffers.
*/
fn process_input_queue(&mut self) -> bool {
let mut in_buffer = self.in_buffer.lock().unwrap();
let count = in_buffer.len();
let recv_queue = &mut self.queues[0]; //receiveq
let mut used_desc_heads = [(0, 0); QUEUE_SIZE as usize];
let mut used_count = 0;
let mut write_count = 0;
for avail_desc in recv_queue.iter(&self.mem) {
let len;
let limit = cmp::min(write_count + avail_desc.len as u32, count as u32);
let source_slice = in_buffer
.drain(write_count as usize..limit as usize)
.collect::<Vec<u8>>();
let write_result = self.mem.write_slice(&source_slice[..], avail_desc.addr);
match write_result {
Ok(_) => {
len = limit - write_count; //avail_desc.len;
write_count = limit;
}
Err(e) => {
error!("Failed to write slice: {:?}", e);
break;
}
}
used_desc_heads[used_count] = (avail_desc.index, len);
used_count += 1;
if write_count >= count as u32 {
break;
}
}
for &(desc_index, len) in &used_desc_heads[..used_count] {
recv_queue.add_used(&self.mem, desc_index, len);
}
used_count > 0
}
/*
* Each port of virtio console device has one transmit
* queue. For outgoing data, characters are placed in
* the transmit queue by the driver. Therefore, here
* we read data from the transmit queue and flush them
* to the referenced address.
*/
fn process_output_queue(&mut self) -> bool {
let trans_queue = &mut self.queues[1]; //transmitq
let mut used_desc_heads = [(0, 0); QUEUE_SIZE as usize];
let mut used_count = 0;
for avail_desc in trans_queue.iter(&self.mem) {
let len;
let _ = self
.mem
.write_to(avail_desc.addr, &mut self.out, avail_desc.len as usize);
let _ = self.out.flush();
len = avail_desc.len;
used_desc_heads[used_count] = (avail_desc.index, len);
used_count += 1;
}
for &(desc_index, len) in &used_desc_heads[..used_count] {
trans_queue.add_used(&self.mem, desc_index, len);
}
used_count > 0
}
fn signal_used_queue(&self) -> result::Result<(), DeviceError> {
self.interrupt_status
.fetch_or(INTERRUPT_STATUS_USED_RING as usize, Ordering::SeqCst);
(self.interrupt_cb)(&self.queues[0]).map_err(|e| {
error!("Failed to signal used queue: {:?}", e);
DeviceError::FailedSignalingUsedQueue(e)
})
}
fn run(&mut self) -> result::Result<(), DeviceError> {
// Create the epoll file descriptor
let epoll_fd = epoll::create(true).map_err(DeviceError::EpollCreateFd)?;
// Add events
epoll::ctl(
epoll_fd,
epoll::ControlOptions::EPOLL_CTL_ADD,
self.input_queue_evt.as_raw_fd(),
epoll::Event::new(epoll::Events::EPOLLIN, u64::from(INPUT_QUEUE_EVENT)),
)
.map_err(DeviceError::EpollCtl)?;
epoll::ctl(
epoll_fd,
epoll::ControlOptions::EPOLL_CTL_ADD,
self.output_queue_evt.as_raw_fd(),
epoll::Event::new(epoll::Events::EPOLLIN, u64::from(OUTPUT_QUEUE_EVENT)),
)
.map_err(DeviceError::EpollCtl)?;
epoll::ctl(
epoll_fd,
epoll::ControlOptions::EPOLL_CTL_ADD,
self.input_evt.as_raw_fd(),
epoll::Event::new(epoll::Events::EPOLLIN, u64::from(INPUT_EVENT)),
)
.map_err(DeviceError::EpollCtl)?;
epoll::ctl(
epoll_fd,
epoll::ControlOptions::EPOLL_CTL_ADD,
self.kill_evt.as_raw_fd(),
epoll::Event::new(epoll::Events::EPOLLIN, u64::from(KILL_EVENT)),
)
.map_err(DeviceError::EpollCtl)?;
const EPOLL_EVENTS_LEN: usize = 100;
let mut events = vec![epoll::Event::new(epoll::Events::empty(), 0); EPOLL_EVENTS_LEN];
'epoll: loop {
let num_events =
epoll::wait(epoll_fd, -1, &mut events[..]).map_err(DeviceError::EpollWait)?;
for event in events.iter().take(num_events) {
let ev_type = event.data as u16;
match ev_type {
INPUT_QUEUE_EVENT => {
if let Err(e) = self.input_queue_evt.read() {
error!("Failed to get queue event: {:?}", e);
break 'epoll;
}
}
OUTPUT_QUEUE_EVENT => {
if let Err(e) = self.output_queue_evt.read() {
error!("Failed to get queue event: {:?}", e);
break 'epoll;
} else {
self.process_output_queue();
}
}
INPUT_EVENT => {
if let Err(e) = self.input_evt.read() {
error!("Failed to get input event: {:?}", e);
break 'epoll;
} else if self.process_input_queue() {
if let Err(e) = self.signal_used_queue() {
error!("Failed to signal used queue: {:?}", e);
break 'epoll;
}
}
}
KILL_EVENT => {
debug!("KILL_EVENT received, stopping epoll loop");
break 'epoll;
}
_ => {
error!("Unknown event for virtio-console");
}
}
}
}
Ok(())
}
}
/// Virtio device for exposing console to the guest OS through virtio.
pub struct Console {
kill_evt: Option<EventFd>,
avail_features: u64,
acked_features: u64,
input: Arc<ConsoleInput>,
out: Option<Box<io::Write + Send>>,
}
/// Input device.
pub struct ConsoleInput {
input_evt: EventFd,
in_buffer: Arc<Mutex<VecDeque<u8>>>,
}
impl ConsoleInput {
pub fn queue_input_bytes(&self, input: &[u8]) {
let mut in_buffer = self.in_buffer.lock().unwrap();
in_buffer.extend(input);
let _ = self.input_evt.write(1);
}
}
impl Console {
/// Create a new virtio console device that gets random data from /dev/urandom.
pub fn new(out: Option<Box<io::Write + Send>>) -> io::Result<(Console, Arc<ConsoleInput>)> {
let avail_features = 1u64 << VIRTIO_F_VERSION_1;
let input_evt = EventFd::new(EFD_NONBLOCK).unwrap();
let console_input = Arc::new(ConsoleInput {
input_evt,
in_buffer: Arc::new(Mutex::new(VecDeque::new())),
});
Ok((
Console {
kill_evt: None,
avail_features,
acked_features: 0u64,
input: console_input.clone(),
out,
},
console_input,
))
}
}
impl Drop for Console {
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 Console {
fn device_type(&self) -> u32 {
VirtioDeviceType::TYPE_CONSOLE as u32
}
fn queue_max_sizes(&self) -> &[u16] {
QUEUE_SIZES
}
fn features(&self, page: u32) -> u32 {
match page {
// Get the lower 32-bits of the features bitfield.
0 => self.avail_features as u32,
// Get the upper 32-bits of the features bitfield.
1 => (self.avail_features >> 32) as u32,
_ => {
warn!("Received request for unknown features page.");
0u32
}
}
}
fn ack_features(&mut self, page: u32, value: u32) {
let mut v = match page {
0 => u64::from(value),
1 => u64::from(value) << 32,
_ => {
warn!("Cannot acknowledge unknown features page.");
0u64
}
};
// 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;
}
fn read_config(&self, _offset: u64, _data: &mut [u8]) {
warn!("Device specific configuration is not defined yet");
}
fn write_config(&mut self, _offset: u64, _data: &[u8]) {
warn!("Device specific configuration is not defined yet");
}
fn activate(
&mut self,
mem: GuestMemoryMmap,
interrupt_cb: Arc<VirtioInterrupt>,
status: Arc<AtomicUsize>,
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) =
match EventFd::new(EFD_NONBLOCK).and_then(|e| Ok((e.try_clone()?, e))) {
Ok(v) => v,
Err(e) => {
error!("failed creating kill EventFd pair: {}", e);
return Err(ActivateError::BadActivate);
}
};
self.kill_evt = Some(self_kill_evt);
if let Some(out) = self.out.take() {
let mut handler = ConsoleEpollHandler {
queues,
mem,
interrupt_status: status,
interrupt_cb,
in_buffer: self.input.in_buffer.clone(),
out,
input_queue_evt: queue_evts.remove(0),
output_queue_evt: queue_evts.remove(0),
input_evt: self.input.input_evt.try_clone().unwrap(),
kill_evt,
};
let worker_result = thread::Builder::new()
.name("virtio_console".to_string())
.spawn(move || handler.run());
if let Err(e) = worker_result {
error!("failed to spawn virtio_console worker: {}", e);
return Err(ActivateError::BadActivate);;
}
return Ok(());
}
Err(ActivateError::BadActivate)
}
}

View File

@ -20,6 +20,7 @@ use std::fmt;
use std::io;
mod block;
mod console;
mod device;
pub mod fs;
pub mod net;
@ -30,6 +31,7 @@ mod rng;
pub mod transport;
pub use self::block::*;
pub use self::console::*;
pub use self::device::*;
pub use self::fs::*;
pub use self::net::*;
@ -55,6 +57,7 @@ const VIRTIO_F_VERSION_1_BITMASK: u64 = 1 << VIRTIO_F_VERSION_1;
enum VirtioDeviceType {
TYPE_NET = 1,
TYPE_BLOCK = 2,
TYPE_CONSOLE = 3,
TYPE_RNG = 4,
TYPE_BALLOON = 5,
TYPE_9P = 9,