/* SPDX-License-Identifier: GPL-2.0-only */ /* * * irqfd: Allows an fd to be used to inject an interrupt to the guest * Credit goes to Avi Kivity for the original idea. */ #ifndef __LINUX_KVM_IRQFD_H #define __LINUX_KVM_IRQFD_H #include <linux/kvm_host.h> #include <linux/poll.h> /* * Resampling irqfds are a special variety of irqfds used to emulate * level triggered interrupts. The interrupt is asserted on eventfd * trigger. On acknowledgment through the irq ack notifier, the * interrupt is de-asserted and userspace is notified through the * resamplefd. All resamplers on the same gsi are de-asserted * together, so we don't need to track the state of each individual * user. We can also therefore share the same irq source ID. */ struct kvm_kernel_irqfd_resampler { struct kvm *kvm; /* * List of resampling struct _irqfd objects sharing this gsi. * RCU list modified under kvm->irqfds.resampler_lock */ struct list_head list; struct kvm_irq_ack_notifier notifier; /* * Entry in list of kvm->irqfd.resampler_list. Use for sharing * resamplers among irqfds on the same gsi. * Accessed and modified under kvm->irqfds.resampler_lock */ struct list_head link; }; struct kvm_kernel_irqfd { /* Used for MSI fast-path */ struct kvm *kvm; wait_queue_entry_t wait; /* Update side is protected by irqfds.lock */ struct kvm_kernel_irq_routing_entry irq_entry; seqcount_t irq_entry_sc; /* Used for level IRQ fast-path */ int gsi; struct work_struct inject; /* The resampler used by this irqfd (resampler-only) */ struct kvm_kernel_irqfd_resampler *resampler; /* Eventfd notified on resample (resampler-only) */ struct eventfd_ctx *resamplefd; /* Entry in list of irqfds for a resampler (resampler-only) */ struct list_head resampler_link; /* Used for setup/shutdown */ struct eventfd_ctx *eventfd; struct list_head list; poll_table pt; struct work_struct shutdown; struct irq_bypass_consumer consumer; struct irq_bypass_producer *producer; }; #endif /* __LINUX_KVM_IRQFD_H */