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2504ba9f | 1 | /* SPDX-License-Identifier: GPL-2.0-only */ |
166c9775 | 2 | /* |
166c9775 EA |
3 | * |
4 | * irqfd: Allows an fd to be used to inject an interrupt to the guest | |
5 | * Credit goes to Avi Kivity for the original idea. | |
6 | */ | |
7 | ||
8 | #ifndef __LINUX_KVM_IRQFD_H | |
9 | #define __LINUX_KVM_IRQFD_H | |
10 | ||
11 | #include <linux/kvm_host.h> | |
12 | #include <linux/poll.h> | |
13 | ||
14 | /* | |
15 | * Resampling irqfds are a special variety of irqfds used to emulate | |
16 | * level triggered interrupts. The interrupt is asserted on eventfd | |
17 | * trigger. On acknowledgment through the irq ack notifier, the | |
18 | * interrupt is de-asserted and userspace is notified through the | |
19 | * resamplefd. All resamplers on the same gsi are de-asserted | |
20 | * together, so we don't need to track the state of each individual | |
21 | * user. We can also therefore share the same irq source ID. | |
22 | */ | |
23 | struct kvm_kernel_irqfd_resampler { | |
24 | struct kvm *kvm; | |
25 | /* | |
26 | * List of resampling struct _irqfd objects sharing this gsi. | |
27 | * RCU list modified under kvm->irqfds.resampler_lock | |
28 | */ | |
29 | struct list_head list; | |
30 | struct kvm_irq_ack_notifier notifier; | |
31 | /* | |
32 | * Entry in list of kvm->irqfd.resampler_list. Use for sharing | |
33 | * resamplers among irqfds on the same gsi. | |
34 | * Accessed and modified under kvm->irqfds.resampler_lock | |
35 | */ | |
36 | struct list_head link; | |
37 | }; | |
38 | ||
39 | struct kvm_kernel_irqfd { | |
40 | /* Used for MSI fast-path */ | |
41 | struct kvm *kvm; | |
ac6424b9 | 42 | wait_queue_entry_t wait; |
166c9775 EA |
43 | /* Update side is protected by irqfds.lock */ |
44 | struct kvm_kernel_irq_routing_entry irq_entry; | |
45 | seqcount_t irq_entry_sc; | |
46 | /* Used for level IRQ fast-path */ | |
47 | int gsi; | |
48 | struct work_struct inject; | |
49 | /* The resampler used by this irqfd (resampler-only) */ | |
50 | struct kvm_kernel_irqfd_resampler *resampler; | |
51 | /* Eventfd notified on resample (resampler-only) */ | |
52 | struct eventfd_ctx *resamplefd; | |
53 | /* Entry in list of irqfds for a resampler (resampler-only) */ | |
54 | struct list_head resampler_link; | |
55 | /* Used for setup/shutdown */ | |
56 | struct eventfd_ctx *eventfd; | |
57 | struct list_head list; | |
58 | poll_table pt; | |
59 | struct work_struct shutdown; | |
9016cfb5 EA |
60 | struct irq_bypass_consumer consumer; |
61 | struct irq_bypass_producer *producer; | |
166c9775 EA |
62 | }; |
63 | ||
64 | #endif /* __LINUX_KVM_IRQFD_H */ |