Struct KvmKernelIrqChip

pub struct KvmKernelIrqChip {
    pub(super) vm: Arc<KvmVm>,
    pub(super) vcpus: Mutex<Vec<Option<Arc<KvmVcpu>>>>,
    pub(super) routes: Mutex<Vec<IrqRoute>>,
}

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.

Fields

vm: Arc<KvmVm>

vcpus: Mutex<Vec<Option<Arc<KvmVcpu>>>>

routes: Mutex<Vec<IrqRoute>>

Implementations

impl KvmKernelIrqChip

pub fn new(vm: Arc<KvmVm>, num_vcpus: usize) -> Result<KvmKernelIrqChip>

Construct a new KvmKernelIrqchip.

Trait Implementations

impl IrqChip for KvmKernelIrqChip

This IrqChip only works with Kvm so we only implement it for KvmVcpu.

fn add_vcpu(&self, vcpu_id: usize, vcpu: Arc<dyn VcpuArch>) -> Result<()>

Add a vcpu to the irq chip.

fn register_edge_irq_event( &self, irq: u32, irq_event: &IrqEdgeEvent, _source: IrqEventSource, ) -> Result<Option<IrqEventIndex>>

Register an event with edge-trigger semantic that can trigger an interrupt for a particular GSI.

fn unregister_edge_irq_event( &self, irq: u32, irq_event: &IrqEdgeEvent, ) -> Result<()>

Unregister an event with edge-trigger semantic for a particular GSI.

fn register_level_irq_event( &self, irq: u32, irq_event: &IrqLevelEvent, _source: IrqEventSource, ) -> Result<Option<IrqEventIndex>>

Register an event with level-trigger semantic that can trigger an interrupt for a particular GSI.

fn unregister_level_irq_event( &self, irq: u32, irq_event: &IrqLevelEvent, ) -> Result<()>

Unregister an event with level-trigger semantic for a particular GSI.

fn route_irq(&self, route: IrqRoute) -> Result<()>

Route an IRQ line to an interrupt controller, or to a particular MSI vector.

fn set_irq_routes(&self, routes: &[IrqRoute]) -> Result<()>

Replace all irq routes with the supplied routes

fn irq_event_tokens( &self, ) -> Result<Vec<(IrqEventIndex, IrqEventSource, Event)>>

Return a vector of all registered irq numbers and their associated events and event indices. These should be used by the main thread to wait for irq events. For the KvmKernelIrqChip, the kernel handles listening to irq events being triggered by devices, so this function always returns an empty Vec.

fn service_irq(&self, irq: u32, level: bool) -> Result<()>

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. For the KvmKernelIrqChip this simply calls the KVM_SET_IRQ_LINE ioctl.

fn service_irq_event(&self, _event_index: IrqEventIndex) -> Result<()>

Service an IRQ event by asserting then deasserting an IRQ line. The associated Event that triggered the irq event will be read from. If the irq is associated with a resample Event, then the deassert will only happen after an EOI is broadcast for a vector associated with the irq line. This function should never be called on KvmKernelIrqChip.

fn broadcast_eoi(&self, _vector: u8) -> Result<()>

Broadcast an end of interrupt. This should never be called on a KvmKernelIrqChip because a KVM vcpu should never exit with the KVM_EXIT_EOI_BROADCAST reason when an in-kernel irqchip exists.

fn inject_interrupts(&self, _vcpu: &dyn VcpuArch) -> Result<()>

Injects any pending interrupts for vcpu. For KvmKernelIrqChip this is a no-op because KVM is responsible for injecting all interrupts.

fn halted(&self, _vcpu_id: usize)

Notifies the irq chip that the specified VCPU has executed a halt instruction. For KvmKernelIrqChip this is a no-op because KVM handles VCPU blocking.

fn wait_until_runnable(&self, _vcpu: &dyn VcpuArch) -> Result<VcpuRunState>

Blocks until vcpu is in a runnable state or until interrupted by IrqChip::kick_halted_vcpus. Returns VcpuRunState::Runnable if vcpu is runnable, or VcpuRunState::Interrupted` if the wait was interrupted. For KvmKernelIrqChip this is a no-op and always returns Runnable because KVM handles VCPU blocking.

fn kick_halted_vcpus(&self)

Makes unrunnable VCPUs return immediately from wait_until_runnable. For KvmKernelIrqChip this is a no-op because KVM handles VCPU blocking.

fn get_mp_state(&self, vcpu_id: usize) -> Result<MPState>

Get the current MP state of the specified VCPU.

fn set_mp_state(&self, vcpu_id: usize, state: &MPState) -> Result<()>

Set the current MP state of the specified VCPU.

fn finalize_devices( self: Arc<Self>, _resources: &mut SystemAllocator, _io_bus: &Bus, _mmio_bus: &Bus, ) -> Result<()>

Finalize irqchip setup. Should be called once all devices have registered irq events and been added to the io_bus and mmio_bus. KvmKernelIrqChip does not need to do anything here.

fn process_delayed_irq_events(&self) -> Result<()>

The KvmKernelIrqChip doesn’t process irq events itself so this function does nothing.

fn irq_delayed_event_token(&self) -> Result<Option<Event>>

Return an event which is meant to trigger process of any irqs events that were delayed by calling process_delayed_irq_events(). This should be used by the main thread to wait for delayed irq event kick. It is process_delayed_irq_events() responsibility to read the event as long as there is no more irqs to be serviced.

fn check_capability(&self, c: IrqChipCap) -> bool

Checks if a particular IrqChipCap is available.

impl IrqChipX86_64 for KvmKernelIrqChip

fn get_pic_state(&self, select: PicSelect) -> Result<PicState>

Get the current state of the PIC

fn set_pic_state(&self, select: PicSelect, state: &PicState) -> Result<()>

Set the current state of the PIC

fn get_ioapic_state(&self) -> Result<IoapicState>

Get the current state of the IOAPIC

fn set_ioapic_state(&self, state: &IoapicState) -> Result<()>

Set the current state of the IOAPIC

fn get_lapic_state(&self, vcpu_id: usize) -> Result<LapicState>

Get the current state of the specified VCPU’s local APIC

fn set_lapic_state(&self, vcpu_id: usize, state: &LapicState) -> Result<()>

Set the current state of the specified VCPU’s local APIC

fn lapic_frequency(&self) -> u32

Get the lapic frequency in Hz

fn get_pit(&self) -> Result<PitState>

Retrieves the state of the PIT. Gets the pit state via the KVM API.

fn set_pit(&self, state: &PitState) -> Result<()>

Sets the state of the PIT. Sets the pit state via the KVM API.

fn pit_uses_speaker_port(&self) -> bool

Returns true if the PIT uses port 0x61 for the PC speaker, false if 0x61 is unused. KVM’s kernel PIT doesn’t use 0x61.

fn snapshot_chip_specific(&self) -> Result<AnySnapshot>

Snapshot state specific to different IrqChips.

fn restore_chip_specific(&self, data: AnySnapshot) -> Result<()>

Restore state specific to different IrqChips.

fn snapshot(&self, cpus_num: usize) -> Result<AnySnapshot>

Snapshot state common to IrqChips.

fn restore(&self, data: AnySnapshot, vcpus_num: usize) -> Result<()>

Restore state common to IrqChips.