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// Copyright 2018 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.
extern crate devices;
extern crate io_jail;
extern crate kernel_cmdline;
extern crate kvm;
extern crate libc;
extern crate resources;
extern crate sync;
extern crate sys_util;
use std::fmt;
use std::fs::File;
use std::os::unix::io::AsRawFd;
use std::result;
use std::sync::Arc;
use devices::virtio::VirtioDevice;
use devices::{
Bus, BusDevice, BusError, PciDevice, PciDeviceError, PciInterruptPin, PciRoot, ProxyDevice,
Serial,
};
use io_jail::Minijail;
use kvm::{IoeventAddress, Kvm, Vcpu, Vm};
use resources::SystemAllocator;
use sync::Mutex;
use sys_util::{syslog, EventFd, GuestMemory};
pub type Result<T> = result::Result<T, Box<std::error::Error>>;
/// Holds the pieces needed to build a VM. Passed to `build_vm` in the `LinuxArch` trait below to
/// create a `RunnableLinuxVm`.
pub struct VmComponents {
pub memory_mb: u64,
pub vcpu_count: u32,
pub kernel_image: File,
pub extra_kernel_params: Vec<String>,
pub wayland_dmabuf: bool,
}
/// Holds the elements needed to run a Linux VM. Created by `build_vm`.
pub struct RunnableLinuxVm {
pub vm: Vm,
pub kvm: Kvm,
pub resources: SystemAllocator,
pub stdio_serial: Arc<Mutex<Serial>>,
pub exit_evt: EventFd,
pub vcpus: Vec<Vcpu>,
pub irq_chip: Option<File>,
pub io_bus: Bus,
pub mmio_bus: Bus,
}
/// The device and optional jail.
pub struct VirtioDeviceStub {
pub dev: Box<VirtioDevice>,
pub jail: Option<Minijail>,
}
/// Trait which is implemented for each Linux Architecture in order to
/// set up the memory, cpus, and system devices and to boot the kernel.
pub trait LinuxArch {
/// Takes `VmComponents` and generates a `RunnableLinuxVm`.
///
/// # Arguments
///
/// * `components` - Parts to use to build the VM.
/// * `virtio_devs` - Function to generate a list of virtio devices.
fn build_vm<F>(components: VmComponents, virtio_devs: F) -> Result<RunnableLinuxVm>
where
F: FnOnce(
&GuestMemory,
&EventFd,
) -> Result<Vec<(Box<PciDevice + 'static>, Option<Minijail>)>>;
}
/// Errors for device manager.
#[derive(Debug)]
pub enum DeviceRegistrationError {
/// Could not allocate IO space for the device.
AllocateIoAddrs(PciDeviceError),
/// Could not allocate an IRQ number.
AllocateIrq,
/// Could not create the mmio device to wrap a VirtioDevice.
CreateMmioDevice(sys_util::Error),
/// Could not create an event fd.
EventFdCreate(sys_util::Error),
/// Could not add a device to the mmio bus.
MmioInsert(BusError),
/// Failed to register ioevent with VM.
RegisterIoevent(sys_util::Error),
/// Failed to register irq eventfd with VM.
RegisterIrqfd(sys_util::Error),
/// Failed to initialize proxy device for jailed device.
ProxyDeviceCreation(devices::ProxyError),
/// Appending to kernel command line failed.
Cmdline(kernel_cmdline::Error),
/// No more IRQs are available.
IrqsExhausted,
/// No more MMIO space available.
AddrsExhausted,
}
impl fmt::Display for DeviceRegistrationError {
fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
match self {
DeviceRegistrationError::AllocateIoAddrs(e) => {
write!(f, "Allocating IO addresses: {:?}", e)
}
DeviceRegistrationError::AllocateIrq => write!(f, "Allocating IRQ number"),
DeviceRegistrationError::CreateMmioDevice(e) => {
write!(f, "failed to create mmio device: {:?}", e)
}
DeviceRegistrationError::Cmdline(e) => {
write!(f, "unable to add device to kernel command line: {}", e)
}
DeviceRegistrationError::EventFdCreate(e) => {
write!(f, "failed to create eventfd: {:?}", e)
}
DeviceRegistrationError::MmioInsert(e) => {
write!(f, "failed to add to mmio bus: {:?}", e)
}
DeviceRegistrationError::RegisterIoevent(e) => {
write!(f, "failed to register ioevent to VM: {:?}", e)
}
DeviceRegistrationError::RegisterIrqfd(e) => {
write!(f, "failed to register irq eventfd to VM: {:?}", e)
}
DeviceRegistrationError::ProxyDeviceCreation(e) => {
write!(f, "failed to create proxy device: {}", e)
}
DeviceRegistrationError::IrqsExhausted => write!(f, "no more IRQs are available"),
DeviceRegistrationError::AddrsExhausted => write!(f, "no more addresses are available"),
}
}
}
/// Creates a root PCI device for use by this Vm.
pub fn generate_pci_root(
devices: Vec<(Box<PciDevice + 'static>, Option<Minijail>)>,
mmio_bus: &mut Bus,
resources: &mut SystemAllocator,
vm: &mut Vm,
) -> std::result::Result<(PciRoot, Vec<(u32, PciInterruptPin)>), DeviceRegistrationError> {
let mut root = PciRoot::new();
let mut pci_irqs = Vec::new();
for (dev_idx, (mut device, jail)) in devices.into_iter().enumerate() {
let mut keep_fds = device.keep_fds();
syslog::push_fds(&mut keep_fds);
let irqfd = EventFd::new().map_err(DeviceRegistrationError::EventFdCreate)?;
let irq_resample_fd = EventFd::new().map_err(DeviceRegistrationError::EventFdCreate)?;
let irq_num = resources
.allocate_irq()
.ok_or(DeviceRegistrationError::AllocateIrq)? as u32;
let pci_irq_pin = match dev_idx % 4 {
0 => PciInterruptPin::IntA,
1 => PciInterruptPin::IntB,
2 => PciInterruptPin::IntC,
3 => PciInterruptPin::IntD,
_ => panic!(""), // Obviously not possible, but the compiler is not smart enough.
};
vm.register_irqfd_resample(&irqfd, &irq_resample_fd, irq_num)
.map_err(DeviceRegistrationError::RegisterIrqfd)?;
keep_fds.push(irqfd.as_raw_fd());
keep_fds.push(irq_resample_fd.as_raw_fd());
device.assign_irq(irqfd, irq_resample_fd, irq_num, pci_irq_pin);
pci_irqs.push((dev_idx as u32, pci_irq_pin));
let ranges = device
.allocate_io_bars(resources)
.map_err(DeviceRegistrationError::AllocateIoAddrs)?;
for (event, addr, datamatch) in device.ioeventfds() {
let io_addr = IoeventAddress::Mmio(addr);
vm.register_ioevent(&event, io_addr, datamatch)
.map_err(DeviceRegistrationError::RegisterIoevent)?;
keep_fds.push(event.as_raw_fd());
}
let arced_dev: Arc<Mutex<BusDevice>> = if let Some(jail) = jail {
let proxy = ProxyDevice::new(device, &jail, keep_fds)
.map_err(DeviceRegistrationError::ProxyDeviceCreation)?;
Arc::new(Mutex::new(proxy))
} else {
Arc::new(Mutex::new(device))
};
root.add_device(arced_dev.clone());
for range in &ranges {
mmio_bus
.insert(arced_dev.clone(), range.0, range.1, true)
.map_err(DeviceRegistrationError::MmioInsert)?;
}
}
Ok((root, pci_irqs))
}
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