name : kvm_dirty_ring.h #ifndef KVM_DIRTY_RING_H #define KVM_DIRTY_RING_H #include <linux/kvm.h> /** * kvm_dirty_ring: KVM internal dirty ring structure * * @dirty_index: free running counter that points to the next slot in * dirty_ring->dirty_gfns, where a new dirty page should go * @reset_index: free running counter that points to the next dirty page * in dirty_ring->dirty_gfns for which dirty trap needs to * be reenabled * @size: size of the compact list, dirty_ring->dirty_gfns * @soft_limit: when the number of dirty pages in the list reaches this * limit, vcpu that owns this ring should exit to userspace * to allow userspace to harvest all the dirty pages * @dirty_gfns: the array to keep the dirty gfns * @index: index of this dirty ring */ struct kvm_dirty_ring { u32 dirty_index; u32 reset_index; u32 size; u32 soft_limit; struct kvm_dirty_gfn *dirty_gfns; int index; }; #ifndef CONFIG_HAVE_KVM_DIRTY_RING /* * If CONFIG_HAVE_HVM_DIRTY_RING not defined, kvm_dirty_ring.o should * not be included as well, so define these nop functions for the arch. */ static inline u32 kvm_dirty_ring_get_rsvd_entries(void) { return 0; } static inline bool kvm_use_dirty_bitmap(struct kvm *kvm) { return true; } static inline int kvm_dirty_ring_alloc(struct kvm_dirty_ring *ring, int index, u32 size) { return 0; } static inline int kvm_dirty_ring_reset(struct kvm *kvm, struct kvm_dirty_ring *ring) { return 0; } static inline void kvm_dirty_ring_push(struct kvm_vcpu *vcpu, u32 slot, u64 offset) { } static inline struct page *kvm_dirty_ring_get_page(struct kvm_dirty_ring *ring, u32 offset) { return NULL; } static inline void kvm_dirty_ring_free(struct kvm_dirty_ring *ring) { } #else /* CONFIG_HAVE_KVM_DIRTY_RING */ int kvm_cpu_dirty_log_size(void); bool kvm_use_dirty_bitmap(struct kvm *kvm); bool kvm_arch_allow_write_without_running_vcpu(struct kvm *kvm); u32 kvm_dirty_ring_get_rsvd_entries(void); int kvm_dirty_ring_alloc(struct kvm_dirty_ring *ring, int index, u32 size); /* * called with kvm->slots_lock held, returns the number of * processed pages. */ int kvm_dirty_ring_reset(struct kvm *kvm, struct kvm_dirty_ring *ring); /* * returns =0: successfully pushed * <0: unable to push, need to wait */ void kvm_dirty_ring_push(struct kvm_vcpu *vcpu, u32 slot, u64 offset); bool kvm_dirty_ring_check_request(struct kvm_vcpu *vcpu); /* for use in vm_operations_struct */ struct page *kvm_dirty_ring_get_page(struct kvm_dirty_ring *ring, u32 offset); void kvm_dirty_ring_free(struct kvm_dirty_ring *ring); #endif /* CONFIG_HAVE_KVM_DIRTY_RING */ #endif /* KVM_DIRTY_RING_H */