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virtio-devices: console: Report error instead of panic

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Signed-off-by: Bo Chen <chen.bo@intel.com>
This commit is contained in:
Bo Chen 2022-10-25 17:09:47 -07:00 committed by Sebastien Boeuf
parent 989d3d3960
commit da1ab77848
1 changed files with 46 additions and 13 deletions
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59
virtio-devices/src/console.rs
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@ -24,6 +24,7 @@ use std::os::unix::io::AsRawFd;
use std::result;
use std::sync::atomic::{AtomicBool, AtomicU64, Ordering};
use std::sync::{Arc, Barrier, Mutex};
use thiserror::Error;
use versionize::{VersionMap, Versionize, VersionizeResult};
use versionize_derive::Versionize;
use virtio_queue::{Queue, QueueOwnedT, QueueT};
@ -52,6 +53,14 @@ const RESIZE_EVENT: u16 = EPOLL_HELPER_EVENT_LAST + 6;
//Console size feature bit
const VIRTIO_CONSOLE_F_SIZE: u64 = 0;
#[derive(Error, Debug)]
enum Error {
#[error("Descriptor chain too short")]
DescriptorChainTooShort,
#[error("Failed to add used index: {0}")]
QueueAddUsed(virtio_queue::Error),
}
#[derive(Copy, Clone, Debug, Versionize)]
#[repr(C, packed)]
pub struct VirtioConsoleConfig {
@ -204,17 +213,17 @@ impl ConsoleEpollHandler {
* driver in the receive queue for incoming data. Here,
* we place the input data to these empty buffers.
*/
fn process_input_queue(&mut self) -> bool {
fn process_input_queue(&mut self) -> Result<bool, Error> {
let mut in_buffer = self.in_buffer.lock().unwrap();
let recv_queue = &mut self.input_queue; //receiveq
let mut used_descs = false;
if in_buffer.is_empty() {
return false;
return Ok(false);
}
while let Some(mut desc_chain) = recv_queue.pop_descriptor_chain(self.mem.memory()) {
let desc = desc_chain.next().unwrap();
let desc = desc_chain.next().ok_or(Error::DescriptorChainTooShort)?;
let len = cmp::min(desc.len() as u32, in_buffer.len() as u32);
let source_slice = in_buffer.drain(..len as usize).collect::<Vec<u8>>();
@ -230,7 +239,7 @@ impl ConsoleEpollHandler {
recv_queue
.add_used(desc_chain.memory(), desc_chain.head_index(), len)
.unwrap();
.map_err(Error::QueueAddUsed)?;
used_descs = true;
if in_buffer.is_empty() {
@ -238,7 +247,7 @@ impl ConsoleEpollHandler {
}
}
used_descs
Ok(used_descs)
}
/*
@ -248,12 +257,12 @@ impl ConsoleEpollHandler {
* we read data from the transmit queue and flush them
* to the referenced address.
*/
fn process_output_queue(&mut self) -> bool {
fn process_output_queue(&mut self) -> Result<bool, Error> {
let trans_queue = &mut self.output_queue; //transmitq
let mut used_descs = false;
while let Some(mut desc_chain) = trans_queue.pop_descriptor_chain(self.mem.memory()) {
let desc = desc_chain.next().unwrap();
let desc = desc_chain.next().ok_or(Error::DescriptorChainTooShort)?;
if let Some(out) = &mut self.out {
let _ = desc_chain.memory().write_to(
desc.addr()
@ -265,11 +274,11 @@ impl ConsoleEpollHandler {
}
trans_queue
.add_used(desc_chain.memory(), desc_chain.head_index(), desc.len())
.unwrap();
.map_err(Error::QueueAddUsed)?;
used_descs = true;
}
used_descs
Ok(used_descs)
}
fn signal_used_queue(&self, queue_index: u16) -> result::Result<(), DeviceError> {
@ -369,7 +378,13 @@ impl EpollHelperHandler for ConsoleEpollHandler {
self.input_queue_evt.read().map_err(|e| {
EpollHelperError::HandleEvent(anyhow!("Failed to get queue event: {:?}", e))
})?;
if self.process_input_queue() {
let needs_notification = self.process_input_queue().map_err(|e| {
EpollHelperError::HandleEvent(anyhow!(
"Failed to process input queue : {:?}",
e
))
})?;
if needs_notification {
self.signal_used_queue(0).map_err(|e| {
EpollHelperError::HandleEvent(anyhow!(
"Failed to signal used queue: {:?}",
@ -382,7 +397,13 @@ impl EpollHelperHandler for ConsoleEpollHandler {
self.output_queue_evt.read().map_err(|e| {
EpollHelperError::HandleEvent(anyhow!("Failed to get queue event: {:?}", e))
})?;
if self.process_output_queue() {
let needs_notification = self.process_output_queue().map_err(|e| {
EpollHelperError::HandleEvent(anyhow!(
"Failed to process output queue : {:?}",
e
))
})?;
if needs_notification {
self.signal_used_queue(1).map_err(|e| {
EpollHelperError::HandleEvent(anyhow!(
"Failed to signal used queue: {:?}",
@ -395,7 +416,13 @@ impl EpollHelperHandler for ConsoleEpollHandler {
self.input_evt.read().map_err(|e| {
EpollHelperError::HandleEvent(anyhow!("Failed to get input event: {:?}", e))
})?;
if self.process_input_queue() {
let needs_notification = self.process_input_queue().map_err(|e| {
EpollHelperError::HandleEvent(anyhow!(
"Failed to process input queue : {:?}",
e
))
})?;
if needs_notification {
self.signal_used_queue(0).map_err(|e| {
EpollHelperError::HandleEvent(anyhow!(
"Failed to signal used queue: {:?}",
@ -439,7 +466,13 @@ impl EpollHelperHandler for ConsoleEpollHandler {
in_buffer.extend(&input[..count]);
}
if self.process_input_queue() {
let needs_notification = self.process_input_queue().map_err(|e| {
EpollHelperError::HandleEvent(anyhow!(
"Failed to process input queue : {:?}",
e
))
})?;
if needs_notification {
self.signal_used_queue(0).map_err(|e| {
EpollHelperError::HandleEvent(anyhow!(
"Failed to signal used queue: {:?}",