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This new trait simplifies the address translation of a GuestAddress by having GuestAddress implementing it. The three crates virtio-devices, block_util and net_util have been updated accordingly to rely on this new trait, helping with code readability and limiting the amount of duplicated code. Signed-off-by: Sebastien Boeuf <sebastien.boeuf@intel.com>
115 lines
3.5 KiB
Rust
115 lines
3.5 KiB
Rust
// Copyright 2018 Amazon.com, Inc. or its affiliates. All Rights Reserved.
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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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//
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// Copyright © 2019 Intel Corporation
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//
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// SPDX-License-Identifier: Apache-2.0 AND BSD-3-Clause
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//! Implements virtio queues
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use std::fmt::{self, Debug};
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use std::sync::Arc;
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use vm_memory::GuestAddress;
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pub mod queue;
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pub use queue::*;
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pub const VIRTIO_MSI_NO_VECTOR: u16 = 0xffff;
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// Types taken from linux/virtio_ids.h
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#[derive(Copy, Clone, Debug)]
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#[allow(dead_code)]
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#[allow(non_camel_case_types)]
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#[repr(C)]
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pub enum VirtioDeviceType {
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Net = 1,
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Block = 2,
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Console = 3,
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Rng = 4,
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Balloon = 5,
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Fs9P = 9,
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Gpu = 16,
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Input = 18,
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Vsock = 19,
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Iommu = 23,
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Mem = 24,
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Fs = 26,
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Pmem = 27,
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Watchdog = 35, // Temporary until official number allocated
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Unknown = 0xFF,
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}
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impl From<u32> for VirtioDeviceType {
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fn from(t: u32) -> Self {
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match t {
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1 => VirtioDeviceType::Net,
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2 => VirtioDeviceType::Block,
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3 => VirtioDeviceType::Console,
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4 => VirtioDeviceType::Rng,
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5 => VirtioDeviceType::Balloon,
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9 => VirtioDeviceType::Fs9P,
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16 => VirtioDeviceType::Gpu,
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18 => VirtioDeviceType::Input,
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19 => VirtioDeviceType::Vsock,
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23 => VirtioDeviceType::Iommu,
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24 => VirtioDeviceType::Mem,
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26 => VirtioDeviceType::Fs,
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27 => VirtioDeviceType::Pmem,
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35 => VirtioDeviceType::Watchdog,
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_ => VirtioDeviceType::Unknown,
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}
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}
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}
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// In order to use the `{}` marker, the trait `fmt::Display` must be implemented
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// manually for the type VirtioDeviceType.
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impl fmt::Display for VirtioDeviceType {
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// This trait requires `fmt` with this exact signature.
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fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
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let output = match *self {
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VirtioDeviceType::Net => "net",
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VirtioDeviceType::Block => "block",
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VirtioDeviceType::Console => "console",
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VirtioDeviceType::Rng => "rng",
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VirtioDeviceType::Balloon => "balloon",
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VirtioDeviceType::Gpu => "gpu",
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VirtioDeviceType::Fs9P => "9p",
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VirtioDeviceType::Input => "input",
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VirtioDeviceType::Vsock => "vsock",
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VirtioDeviceType::Iommu => "iommu",
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VirtioDeviceType::Mem => "mem",
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VirtioDeviceType::Fs => "fs",
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VirtioDeviceType::Pmem => "pmem",
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VirtioDeviceType::Watchdog => "watchdog",
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VirtioDeviceType::Unknown => "UNKNOWN",
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};
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write!(f, "{}", output)
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}
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}
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/// Trait for devices with access to data in memory being limited and/or
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/// translated.
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pub trait AccessPlatform: Send + Sync + Debug {
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/// Provide a way to translate address ranges.
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fn translate(&self, base: u64, size: u64) -> std::result::Result<u64, std::io::Error>;
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}
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pub trait Translatable {
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#[must_use]
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fn translate(&self, access_platform: Option<&Arc<dyn AccessPlatform>>, len: usize) -> Self;
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}
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impl Translatable for GuestAddress {
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fn translate(&self, access_platform: Option<&Arc<dyn AccessPlatform>>, len: usize) -> Self {
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if let Some(access_platform) = access_platform {
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GuestAddress(access_platform.translate(self.0, len as u64).unwrap())
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} else {
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*self
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}
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}
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}
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