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