1 #ifndef KVM_DIRTY_RING_H
2 #define KVM_DIRTY_RING_H
7 * kvm_dirty_ring: KVM internal dirty ring structure
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
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
21 struct kvm_dirty_ring {
26 struct kvm_dirty_gfn *dirty_gfns;
30 #ifndef CONFIG_HAVE_KVM_DIRTY_RING
32 * If CONFIG_HAVE_HVM_DIRTY_RING not defined, kvm_dirty_ring.o should
33 * not be included as well, so define these nop functions for the arch.
35 static inline u32 kvm_dirty_ring_get_rsvd_entries(void)
40 static inline int kvm_dirty_ring_alloc(struct kvm_dirty_ring *ring,
46 static inline int kvm_dirty_ring_reset(struct kvm *kvm,
47 struct kvm_dirty_ring *ring)
52 static inline void kvm_dirty_ring_push(struct kvm_dirty_ring *ring,
57 static inline struct page *kvm_dirty_ring_get_page(struct kvm_dirty_ring *ring,
63 static inline void kvm_dirty_ring_free(struct kvm_dirty_ring *ring)
67 static inline bool kvm_dirty_ring_soft_full(struct kvm_dirty_ring *ring)
72 #else /* CONFIG_HAVE_KVM_DIRTY_RING */
74 u32 kvm_dirty_ring_get_rsvd_entries(void);
75 int kvm_dirty_ring_alloc(struct kvm_dirty_ring *ring, int index, u32 size);
78 * called with kvm->slots_lock held, returns the number of
81 int kvm_dirty_ring_reset(struct kvm *kvm, struct kvm_dirty_ring *ring);
84 * returns =0: successfully pushed
85 * <0: unable to push, need to wait
87 void kvm_dirty_ring_push(struct kvm_dirty_ring *ring, u32 slot, u64 offset);
89 /* for use in vm_operations_struct */
90 struct page *kvm_dirty_ring_get_page(struct kvm_dirty_ring *ring, u32 offset);
92 void kvm_dirty_ring_free(struct kvm_dirty_ring *ring);
93 bool kvm_dirty_ring_soft_full(struct kvm_dirty_ring *ring);
95 #endif /* CONFIG_HAVE_KVM_DIRTY_RING */
97 #endif /* KVM_DIRTY_RING_H */