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https://github.com/cloud-hypervisor/cloud-hypervisor.git
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950bd205c6
The goal for cloud-hypervisor is to keep the host safe. With this in mind, we want to emulate as much as possible in userspace instead of in kernel directly. The IOAPIC is a good candidate to move from kernel to userspace, which is why this commit introduces a userspace implementation of the IOAPIC 82093AA based on the documentation: https://pdos.csail.mit.edu/6.828/2016/readings/ia32/ioapic.pdf This code is inspired from the files devices/src/ioapic.rs and devices/src/split_irqchip_common.rs from the crosvm codebase. The reference version used being 6c1e23eee3065b3f3d6fc4fb992ac9884dbabf68. Signed-off-by: Sebastien Boeuf <sebastien.boeuf@intel.com>
69 lines
1.6 KiB
Rust
69 lines
1.6 KiB
Rust
// Copyright 2018 Amazon.com, Inc. or its affiliates. All Rights Reserved.
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// SPDX-License-Identifier: Apache-2.0
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//
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// Portions Copyright 2017 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-BSD-3-Clause file.
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//! Emulates virtual and hardware devices.
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extern crate byteorder;
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extern crate epoll;
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extern crate kvm_bindings;
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extern crate kvm_ioctls;
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extern crate libc;
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#[macro_use]
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extern crate log;
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extern crate vm_memory;
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extern crate vmm_sys_util;
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use std::fs::File;
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use std::{io, result};
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mod bus;
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pub mod ioapic;
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pub mod legacy;
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pub use self::bus::{Bus, BusDevice, Error as BusError};
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pub type DeviceEventT = u16;
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/// The payload is used to handle events where the internal state of the VirtIO device
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/// needs to be changed.
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pub enum EpollHandlerPayload {
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/// DrivePayload(disk_image)
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DrivePayload(File),
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/// Events that do not need a payload.
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Empty,
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}
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type Result<T> = std::result::Result<T, Error>;
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pub trait EpollHandler: Send {
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fn handle_event(
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&mut self,
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device_event: DeviceEventT,
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event_flags: u32,
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payload: EpollHandlerPayload,
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) -> Result<()>;
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}
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#[derive(Debug)]
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pub enum Error {
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FailedReadingQueue {
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event_type: &'static str,
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underlying: io::Error,
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},
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FailedReadTap,
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FailedSignalingUsedQueue(io::Error),
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PayloadExpected,
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UnknownEvent {
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device: &'static str,
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event: DeviceEventT,
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},
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IoError(io::Error),
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}
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pub trait Interrupt: Send {
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fn deliver(&self) -> result::Result<(), std::io::Error>;
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}
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