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 */ 21struct 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 30#ifndef CONFIG_HAVE_KVM_DIRTY_RING 31/* 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. 34 */ 35static inline u32 kvm_dirty_ring_get_rsvd_entries(void) 36{ 37 return 0; 38} 39 40static inline bool kvm_use_dirty_bitmap(struct kvm *kvm) 41{ 42 return true; 43} 44 45static inline int kvm_dirty_ring_alloc(struct kvm_dirty_ring *ring, 46 int index, u32 size) 47{ 48 return 0; 49} 50 51static inline int kvm_dirty_ring_reset(struct kvm *kvm, 52 struct kvm_dirty_ring *ring) 53{ 54 return 0; 55} 56 57static inline void kvm_dirty_ring_push(struct kvm_vcpu *vcpu, 58 u32 slot, u64 offset) 59{ 60} 61 62static inline struct page *kvm_dirty_ring_get_page(struct kvm_dirty_ring *ring, 63 u32 offset) 64{ 65 return NULL; 66} 67 68static inline void kvm_dirty_ring_free(struct kvm_dirty_ring *ring) 69{ 70} 71 72#else /* CONFIG_HAVE_KVM_DIRTY_RING */ 73 74int kvm_cpu_dirty_log_size(void); 75bool kvm_use_dirty_bitmap(struct kvm *kvm); 76bool kvm_arch_allow_write_without_running_vcpu(struct kvm *kvm); 77u32 kvm_dirty_ring_get_rsvd_entries(void); 78int kvm_dirty_ring_alloc(struct kvm_dirty_ring *ring, int index, u32 size); 79 80/* 81 * called with kvm->slots_lock held, returns the number of 82 * processed pages. 83 */ 84int 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 */ 90void kvm_dirty_ring_push(struct kvm_vcpu *vcpu, u32 slot, u64 offset); 91 92bool kvm_dirty_ring_check_request(struct kvm_vcpu *vcpu); 93 94/* for use in vm_operations_struct */ 95struct page *kvm_dirty_ring_get_page(struct kvm_dirty_ring *ring, u32 offset); 96 97void kvm_dirty_ring_free(struct kvm_dirty_ring *ring); 98 99#endif /* CONFIG_HAVE_KVM_DIRTY_RING */ 100 101#endif /* KVM_DIRTY_RING_H */ 102