/* 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_spinlock_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 */
|
