include/linux/kvm_host.h

60  * Bit 63 of the memslot generation number is an "update in-progress flag",
63  * mark cached memslot data, e.g. MMIO accesses, as potentially being stale,
74  * memslot update is in-progress, and to prevent cache hits *after* updating
393 	 * The most recently used memslot by this vCPU and the slots generation
396 	 * thousands of years, even assuming 1M memslot operations per second.
569  * Since at idle each memslot belongs to two memslot sets it has to contain
572  * Two memslot sets (one active and one inactive) are necessary so the VM
573  * continues to run on one memslot set while the other is being modified.
575  * These two memslot sets normally point to the same set of memslots.
576  * They can, however, be desynchronized when performing a memslot management
577  * operation by replacing the memslot to be modified by its copy.
578  * After the operation is complete, both memslot sets once again point to
579  * the same, common set of memslot data.
615 static inline unsigned long kvm_dirty_bitmap_bytes(struct kvm_memory_slot *memslot)
617 	return ALIGN(memslot->npages, BITS_PER_LONG) / 8;
620 static inline unsigned long *kvm_second_dirty_bitmap(struct kvm_memory_slot *memslot)
622 	unsigned long len = kvm_dirty_bitmap_bytes(memslot);
624 	return memslot->dirty_bitmap + len / sizeof(*memslot->dirty_bitmap);
726 	 * The mapping table from slot id to memslot.
731 	 * always result in higher memory usage (even for lower memslot counts).
756 	/* The two memslot sets - active and inactive (per address space) */
758 	/* The current active memslot set for each address space */
1053 #define kvm_for_each_memslot(memslot, bkt, slots)			      \
1054 	hash_for_each(slots->id_hash, bkt, memslot, id_node[slots->node_idx]) \
1055 		if (WARN_ON_ONCE(!memslot->npages)) {			      \
1160 /* Iterate over each memslot at least partially intersecting [start, end) range */
1298 void mark_page_dirty_in_slot(struct kvm *kvm, const struct kvm_memory_slot *memslot, gfn_t gfn);
1381  * still hold a read lock on kvm->scru for the memslot checks.
1438 				   const struct kvm_memory_slot *memslot);
1465 void kvm_arch_sync_dirty_log(struct kvm *kvm, struct kvm_memory_slot *memslot);
1470 		      int *is_dirty, struct kvm_memory_slot **memslot);
1698  * Returns a pointer to the memslot if it contains gfn.
1714  * Returns a pointer to the memslot that contains gfn. Otherwise returns NULL.
1716  * With "approx" set returns the memslot also when the address falls
1824 	if (!gpc->memslot)
1827 	mark_page_dirty_in_slot(gpc->kvm, gpc->memslot, gpa_to_gfn(gpc->gpa));
2288 static inline bool kvm_is_visible_memslot(struct kvm_memory_slot *memslot)
2290 	return (memslot && memslot->id < KVM_USER_MEM_SLOTS &&
2291 		!(memslot->flags & KVM_MEMSLOT_INVALID));