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// Copyright 2017 The Chromium OS Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
use std::os::raw::c_ulonglong;
use sys_util::{EventFd, PollContext, PollToken};
use vhost::Vhost;
use super::{Error, Result};
use crate::virtio::{Interrupt, Queue};
/// Worker that takes care of running the vhost device. This mainly involves forwarding interrupts
/// from the vhost driver to the guest VM because crosvm only supports the virtio-mmio transport,
/// which requires a bit to be set in the interrupt status register before triggering the interrupt
/// and the vhost driver doesn't do this for us.
pub struct Worker<T: Vhost> {
interrupt: Interrupt,
queues: Vec<Queue>,
pub vhost_handle: T,
pub vhost_interrupt: Vec<EventFd>,
acked_features: u64,
pub kill_evt: EventFd,
}
impl<T: Vhost> Worker<T> {
pub fn new(
queues: Vec<Queue>,
vhost_handle: T,
vhost_interrupt: Vec<EventFd>,
interrupt: Interrupt,
acked_features: u64,
kill_evt: EventFd,
) -> Worker<T> {
Worker {
interrupt,
queues,
vhost_handle,
vhost_interrupt,
acked_features,
kill_evt,
}
}
pub fn run<F1, F2>(
&mut self,
queue_evts: Vec<EventFd>,
queue_sizes: &[u16],
activate_vqs: F1,
cleanup_vqs: F2,
) -> Result<()>
where
F1: FnOnce(&T) -> Result<()>,
F2: FnOnce(&T) -> Result<()>,
{
let avail_features = self
.vhost_handle
.get_features()
.map_err(Error::VhostGetFeatures)?;
let features: c_ulonglong = self.acked_features & avail_features;
self.vhost_handle
.set_features(features)
.map_err(Error::VhostSetFeatures)?;
self.vhost_handle
.set_mem_table()
.map_err(Error::VhostSetMemTable)?;
for (queue_index, queue) in self.queues.iter().enumerate() {
self.vhost_handle
.set_vring_num(queue_index, queue.max_size)
.map_err(Error::VhostSetVringNum)?;
self.vhost_handle
.set_vring_addr(
queue_sizes[queue_index],
queue.actual_size(),
queue_index,
0,
queue.desc_table,
queue.used_ring,
queue.avail_ring,
None,
)
.map_err(Error::VhostSetVringAddr)?;
self.vhost_handle
.set_vring_base(queue_index, 0)
.map_err(Error::VhostSetVringBase)?;
self.vhost_handle
.set_vring_call(queue_index, &self.vhost_interrupt[queue_index])
.map_err(Error::VhostSetVringCall)?;
self.vhost_handle
.set_vring_kick(queue_index, &queue_evts[queue_index])
.map_err(Error::VhostSetVringKick)?;
}
activate_vqs(&self.vhost_handle)?;
#[derive(PollToken)]
enum Token {
VhostIrqi { index: usize },
InterruptResample,
Kill,
}
let poll_ctx: PollContext<Token> = PollContext::build_with(&[
(self.interrupt.get_resample_evt(), Token::InterruptResample),
(&self.kill_evt, Token::Kill),
])
.map_err(Error::CreatePollContext)?;
for (index, vhost_int) in self.vhost_interrupt.iter().enumerate() {
poll_ctx
.add(vhost_int, Token::VhostIrqi { index })
.map_err(Error::CreatePollContext)?;
}
'poll: loop {
let events = poll_ctx.wait().map_err(Error::PollError)?;
for event in events.iter_readable() {
match event.token() {
Token::VhostIrqi { index } => {
self.vhost_interrupt[index]
.read()
.map_err(Error::VhostIrqRead)?;
self.interrupt.signal_used_queue(self.queues[index].vector);
}
Token::InterruptResample => {
self.interrupt.interrupt_resample();
}
Token::Kill => {
let _ = self.kill_evt.read();
break 'poll;
}
}
}
}
cleanup_vqs(&self.vhost_handle)?;
Ok(())
}
}
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