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// Copyright 2020 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.
mod kvm;
pub use self::kvm::KvmKernelIrqChip;
use std::marker::{Send, Sized};
use hypervisor::{IrqRoute, Vcpu};
use sys_util::{EventFd, Result};
#[cfg(any(target_arch = "x86", target_arch = "x86_64"))]
mod x86_64;
#[cfg(any(target_arch = "x86", target_arch = "x86_64"))]
pub use x86_64::*;
/// Trait that abstracts interactions with interrupt controllers.
///
/// Each VM will have one IrqChip instance which is responsible for routing IRQ lines and
/// registering IRQ events. Depending on the implementation, the IrqChip may interact with an
/// underlying hypervisor API or emulate devices in userspace.
///
/// This trait is generic over a Vcpu type because some IrqChip implementations can support
/// multiple hypervisors with a single implementation.
pub trait IrqChip<V: Vcpu>: Send + Sized {
/// Add a vcpu to the irq chip.
fn add_vcpu(&mut self, vcpu_id: usize, vcpu: V) -> Result<()>;
/// Register an event that can trigger an interrupt for a particular GSI.
fn register_irq_event(
&mut self,
irq: u32,
irq_event: &EventFd,
resample_event: Option<&EventFd>,
) -> Result<()>;
/// Unregister an event for a particular GSI.
fn unregister_irq_event(
&mut self,
irq: u32,
irq_event: &EventFd,
resample_event: Option<&EventFd>,
) -> Result<()>;
/// Route an IRQ line to an interrupt controller, or to a particular MSI vector.
fn route_irq(&mut self, route: IrqRoute) -> Result<()>;
/// Return a vector of all registered irq numbers and their associated events. To be used by
/// the main thread to wait for irq events to be triggered.
fn irq_event_tokens(&self) -> Result<Vec<(u32, EventFd)>>;
/// Either assert or deassert an IRQ line. Sends to either an interrupt controller, or does
/// a send_msi if the irq is associated with an MSI.
fn service_irq(&mut self, irq: u32, level: bool) -> Result<()>;
/// Broadcast an end of interrupt.
fn broadcast_eoi(&mut self, vector: u8) -> Result<()>;
/// Return true if there is a pending interrupt for the specified vcpu.
fn interrupt_requested(&self, vcpu_id: usize) -> bool;
/// Check if the specified vcpu has any pending interrupts. Returns None for no interrupts,
/// otherwise Some(u32) should be the injected interrupt vector.
fn get_external_interrupt(&mut self, vcpu_id: usize) -> Result<Option<u32>>;
/// Attempt to clone this IrqChip instance.
fn try_clone(&self) -> Result<Self>;
}
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