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