diff options
Diffstat (limited to 'include/linux/kvm_irqfd.h')
| -rw-r--r-- | include/linux/kvm_irqfd.h | 71 |
1 files changed, 71 insertions, 0 deletions
diff --git a/include/linux/kvm_irqfd.h b/include/linux/kvm_irqfd.h new file mode 100644 index 000000000000..0c1de05098c8 --- /dev/null +++ b/include/linux/kvm_irqfd.h | |||
| @@ -0,0 +1,71 @@ | |||
| 1 | /* | ||
| 2 | * This program is free software; you can redistribute it and/or modify | ||
| 3 | * it under the terms of the GNU General Public License as published by | ||
| 4 | * the Free Software Foundation; either version 2 of the License. | ||
| 5 | * | ||
| 6 | * This program is distributed in the hope that it will be useful, | ||
| 7 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | ||
| 8 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | ||
| 9 | * GNU General Public License for more details. | ||
| 10 | * | ||
| 11 | * irqfd: Allows an fd to be used to inject an interrupt to the guest | ||
| 12 | * Credit goes to Avi Kivity for the original idea. | ||
| 13 | */ | ||
| 14 | |||
| 15 | #ifndef __LINUX_KVM_IRQFD_H | ||
| 16 | #define __LINUX_KVM_IRQFD_H | ||
| 17 | |||
| 18 | #include <linux/kvm_host.h> | ||
| 19 | #include <linux/poll.h> | ||
| 20 | |||
| 21 | /* | ||
| 22 | * Resampling irqfds are a special variety of irqfds used to emulate | ||
| 23 | * level triggered interrupts. The interrupt is asserted on eventfd | ||
| 24 | * trigger. On acknowledgment through the irq ack notifier, the | ||
| 25 | * interrupt is de-asserted and userspace is notified through the | ||
| 26 | * resamplefd. All resamplers on the same gsi are de-asserted | ||
| 27 | * together, so we don't need to track the state of each individual | ||
| 28 | * user. We can also therefore share the same irq source ID. | ||
| 29 | */ | ||
| 30 | struct kvm_kernel_irqfd_resampler { | ||
| 31 | struct kvm *kvm; | ||
| 32 | /* | ||
| 33 | * List of resampling struct _irqfd objects sharing this gsi. | ||
| 34 | * RCU list modified under kvm->irqfds.resampler_lock | ||
| 35 | */ | ||
| 36 | struct list_head list; | ||
| 37 | struct kvm_irq_ack_notifier notifier; | ||
| 38 | /* | ||
| 39 | * Entry in list of kvm->irqfd.resampler_list. Use for sharing | ||
| 40 | * resamplers among irqfds on the same gsi. | ||
| 41 | * Accessed and modified under kvm->irqfds.resampler_lock | ||
| 42 | */ | ||
| 43 | struct list_head link; | ||
| 44 | }; | ||
| 45 | |||
| 46 | struct kvm_kernel_irqfd { | ||
| 47 | /* Used for MSI fast-path */ | ||
| 48 | struct kvm *kvm; | ||
| 49 | wait_queue_t wait; | ||
| 50 | /* Update side is protected by irqfds.lock */ | ||
| 51 | struct kvm_kernel_irq_routing_entry irq_entry; | ||
| 52 | seqcount_t irq_entry_sc; | ||
| 53 | /* Used for level IRQ fast-path */ | ||
| 54 | int gsi; | ||
| 55 | struct work_struct inject; | ||
| 56 | /* The resampler used by this irqfd (resampler-only) */ | ||
| 57 | struct kvm_kernel_irqfd_resampler *resampler; | ||
| 58 | /* Eventfd notified on resample (resampler-only) */ | ||
| 59 | struct eventfd_ctx *resamplefd; | ||
| 60 | /* Entry in list of irqfds for a resampler (resampler-only) */ | ||
| 61 | struct list_head resampler_link; | ||
| 62 | /* Used for setup/shutdown */ | ||
| 63 | struct eventfd_ctx *eventfd; | ||
| 64 | struct list_head list; | ||
| 65 | poll_table pt; | ||
| 66 | struct work_struct shutdown; | ||
| 67 | struct irq_bypass_consumer consumer; | ||
| 68 | struct irq_bypass_producer *producer; | ||
| 69 | }; | ||
| 70 | |||
| 71 | #endif /* __LINUX_KVM_IRQFD_H */ | ||