| /* |
| * This program is free software; you can redistribute it and/or modify |
| * it under the terms of the GNU General Public License as published by |
| * the Free Software Foundation; either version 2 of the License. |
| * |
| * This program is distributed in the hope that it will be useful, |
| * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| * GNU General Public License for more details. |
| * |
| * 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_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 */ |