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fb04a1ed PX |
1 | #ifndef KVM_DIRTY_RING_H |
2 | #define KVM_DIRTY_RING_H | |
3 | ||
4 | #include <linux/kvm.h> | |
5 | ||
6 | /** | |
7 | * kvm_dirty_ring: KVM internal dirty ring structure | |
8 | * | |
9 | * @dirty_index: free running counter that points to the next slot in | |
10 | * dirty_ring->dirty_gfns, where a new dirty page should go | |
11 | * @reset_index: free running counter that points to the next dirty page | |
12 | * in dirty_ring->dirty_gfns for which dirty trap needs to | |
13 | * be reenabled | |
14 | * @size: size of the compact list, dirty_ring->dirty_gfns | |
15 | * @soft_limit: when the number of dirty pages in the list reaches this | |
16 | * limit, vcpu that owns this ring should exit to userspace | |
17 | * to allow userspace to harvest all the dirty pages | |
18 | * @dirty_gfns: the array to keep the dirty gfns | |
19 | * @index: index of this dirty ring | |
20 | */ | |
21 | struct kvm_dirty_ring { | |
22 | u32 dirty_index; | |
23 | u32 reset_index; | |
24 | u32 size; | |
25 | u32 soft_limit; | |
26 | struct kvm_dirty_gfn *dirty_gfns; | |
27 | int index; | |
28 | }; | |
29 | ||
dc70ec21 | 30 | #ifndef CONFIG_HAVE_KVM_DIRTY_RING |
fb04a1ed | 31 | /* |
dc70ec21 | 32 | * If CONFIG_HAVE_HVM_DIRTY_RING not defined, kvm_dirty_ring.o should |
fb04a1ed PX |
33 | * not be included as well, so define these nop functions for the arch. |
34 | */ | |
35 | static inline u32 kvm_dirty_ring_get_rsvd_entries(void) | |
36 | { | |
37 | return 0; | |
38 | } | |
39 | ||
86bdf3eb GS |
40 | static inline bool kvm_use_dirty_bitmap(struct kvm *kvm) |
41 | { | |
42 | return true; | |
43 | } | |
44 | ||
fb04a1ed PX |
45 | static inline int kvm_dirty_ring_alloc(struct kvm_dirty_ring *ring, |
46 | int index, u32 size) | |
47 | { | |
48 | return 0; | |
49 | } | |
50 | ||
fb04a1ed PX |
51 | static inline int kvm_dirty_ring_reset(struct kvm *kvm, |
52 | struct kvm_dirty_ring *ring) | |
53 | { | |
54 | return 0; | |
55 | } | |
56 | ||
cf87ac73 | 57 | static inline void kvm_dirty_ring_push(struct kvm_vcpu *vcpu, |
fb04a1ed PX |
58 | u32 slot, u64 offset) |
59 | { | |
60 | } | |
61 | ||
62 | static inline struct page *kvm_dirty_ring_get_page(struct kvm_dirty_ring *ring, | |
63 | u32 offset) | |
64 | { | |
65 | return NULL; | |
66 | } | |
67 | ||
68 | static inline void kvm_dirty_ring_free(struct kvm_dirty_ring *ring) | |
69 | { | |
70 | } | |
71 | ||
dc70ec21 | 72 | #else /* CONFIG_HAVE_KVM_DIRTY_RING */ |
fb04a1ed | 73 | |
e8a18565 | 74 | int kvm_cpu_dirty_log_size(void); |
86bdf3eb GS |
75 | bool kvm_use_dirty_bitmap(struct kvm *kvm); |
76 | bool kvm_arch_allow_write_without_running_vcpu(struct kvm *kvm); | |
fb04a1ed PX |
77 | u32 kvm_dirty_ring_get_rsvd_entries(void); |
78 | int kvm_dirty_ring_alloc(struct kvm_dirty_ring *ring, int index, u32 size); | |
fb04a1ed PX |
79 | |
80 | /* | |
81 | * called with kvm->slots_lock held, returns the number of | |
82 | * processed pages. | |
83 | */ | |
84 | int kvm_dirty_ring_reset(struct kvm *kvm, struct kvm_dirty_ring *ring); | |
85 | ||
86 | /* | |
87 | * returns =0: successfully pushed | |
88 | * <0: unable to push, need to wait | |
89 | */ | |
cf87ac73 GS |
90 | void kvm_dirty_ring_push(struct kvm_vcpu *vcpu, u32 slot, u64 offset); |
91 | ||
92 | bool kvm_dirty_ring_check_request(struct kvm_vcpu *vcpu); | |
fb04a1ed PX |
93 | |
94 | /* for use in vm_operations_struct */ | |
95 | struct page *kvm_dirty_ring_get_page(struct kvm_dirty_ring *ring, u32 offset); | |
96 | ||
97 | void kvm_dirty_ring_free(struct kvm_dirty_ring *ring); | |
fb04a1ed | 98 | |
dc70ec21 | 99 | #endif /* CONFIG_HAVE_KVM_DIRTY_RING */ |
fb04a1ed PX |
100 | |
101 | #endif /* KVM_DIRTY_RING_H */ |