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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.
use hypervisor::kvm::{KvmVcpu, KvmVm};
use hypervisor::IrqRoute;
use std::sync::Arc;
use sync::Mutex;
use sys_util::{EventFd, Result};
use crate::IrqChip;
/// IrqChip implementation where the entire IrqChip is emulated by KVM.
///
/// This implementation will use the KVM API to create and configure the in-kernel irqchip.
pub struct KvmKernelIrqChip {
_vm: KvmVm,
vcpus: Arc<Mutex<Vec<Option<KvmVcpu>>>>,
}
impl KvmKernelIrqChip {
/// Construct a new KvmKernelIrqchip.
pub fn new(vm: KvmVm, num_vcpus: usize) -> Result<KvmKernelIrqChip> {
Ok(KvmKernelIrqChip {
_vm: vm,
vcpus: Arc::new(Mutex::new((0..num_vcpus).map(|_| None).collect())),
})
}
}
/// This IrqChip only works with Kvm so we only implement it for KvmVcpu.
impl IrqChip<KvmVcpu> for KvmKernelIrqChip {
/// Add a vcpu to the irq chip.
fn add_vcpu(&mut self, vcpu_id: usize, vcpu: KvmVcpu) -> Result<()> {
self.vcpus.lock().insert(vcpu_id, Some(vcpu));
Ok(())
}
/// 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<()> {
unimplemented!("register_irq_event for KvmKernelIrqChip is not yet implemented");
}
/// Unregister an event for a particular GSI.
fn unregister_irq_event(
&mut self,
_irq: u32,
_irq_event: &EventFd,
_resample_event: Option<&EventFd>,
) -> Result<()> {
unimplemented!("unregister_irq_event for KvmKernelIrqChip is not yet implemented");
}
/// Route an IRQ line to an interrupt controller, or to a particular MSI vector.
fn route_irq(&mut self, _route: IrqRoute) -> Result<()> {
unimplemented!("route_irq for KvmKernelIrqChip is not yet implemented");
}
/// 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)>> {
unimplemented!("irq_event_tokens for KvmKernelIrqChip is not yet implemented");
}
/// 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<()> {
unimplemented!("service_irq for KvmKernelIrqChip is not yet implemented");
}
/// Broadcast an end of interrupt.
fn broadcast_eoi(&mut self, _vector: u8) -> Result<()> {
unimplemented!("broadcast_eoi for KvmKernelIrqChip is not yet implemented");
}
/// Return true if there is a pending interrupt for the specified vcpu.
fn interrupt_requested(&self, _vcpu_id: usize) -> bool {
unimplemented!("interrupt_requested for KvmKernelIrqChip is not yet implemented");
}
/// 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>> {
unimplemented!("get_external_interrupt for KvmKernelIrqChip is not yet implemented");
}
/// Attempt to clone this IrqChip instance.
fn try_clone(&self) -> Result<Self> {
unimplemented!("try_clone for KvmKernelIrqChip is not yet implemented");
}
}
#[cfg(test)]
mod tests {
use hypervisor::kvm::{Kvm, KvmVm};
use sys_util::GuestMemory;
use crate::irqchip::{IrqChip, KvmKernelIrqChip};
#[cfg(any(target_arch = "arm", target_arch = "aarch64"))]
use hypervisor::VmAarch64;
#[cfg(any(target_arch = "x86", target_arch = "x86_64"))]
use hypervisor::VmX86_64;
#[test]
fn create_kvm_kernel_irqchip() {
let kvm = Kvm::new().expect("failed to instantiate Kvm");
let mem = GuestMemory::new(&[]).unwrap();
let vm = KvmVm::new(&kvm, mem).expect("failed to instantiate vm");
let vcpu = vm.create_vcpu(0).expect("failed to instantiate vcpu");
let mut chip =
KvmKernelIrqChip::new(vm, 1).expect("failed to instantiate KvmKernelIrqChip");
chip.add_vcpu(0, vcpu).expect("failed to add vcpu");
}
}
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