diff options
| -rw-r--r-- | include/linux/kvm_host.h | 18 | ||||
| -rw-r--r-- | virt/kvm/kvm_main.c | 79 |
2 files changed, 72 insertions, 25 deletions
diff --git a/include/linux/kvm_host.h b/include/linux/kvm_host.h index 123925cd3ae8..9efdf5c703a5 100644 --- a/include/linux/kvm_host.h +++ b/include/linux/kvm_host.h @@ -231,8 +231,12 @@ struct kvm_irq_routing_table {}; #define KVM_MEM_SLOTS_NUM (KVM_MEMORY_SLOTS + KVM_PRIVATE_MEM_SLOTS) #endif +/* + * Note: + * memslots are not sorted by id anymore, please use id_to_memslot() + * to get the memslot by its id. + */ struct kvm_memslots { - int nmemslots; u64 generation; struct kvm_memory_slot memslots[KVM_MEM_SLOTS_NUM]; }; @@ -310,7 +314,8 @@ static inline struct kvm_vcpu *kvm_get_vcpu(struct kvm *kvm, int i) #define kvm_for_each_memslot(memslot, slots) \ for (memslot = &slots->memslots[0]; \ - memslot < slots->memslots + (slots)->nmemslots; memslot++) + memslot < slots->memslots + KVM_MEM_SLOTS_NUM && memslot->npages;\ + memslot++) int kvm_vcpu_init(struct kvm_vcpu *vcpu, struct kvm *kvm, unsigned id); void kvm_vcpu_uninit(struct kvm_vcpu *vcpu); @@ -336,7 +341,14 @@ static inline struct kvm_memslots *kvm_memslots(struct kvm *kvm) static inline struct kvm_memory_slot * id_to_memslot(struct kvm_memslots *slots, int id) { - return &slots->memslots[id]; + int i; + + for (i = 0; i < KVM_MEM_SLOTS_NUM; i++) + if (slots->memslots[i].id == id) + return &slots->memslots[i]; + + WARN_ON(1); + return NULL; } #define HPA_MSB ((sizeof(hpa_t) * 8) - 1) diff --git a/virt/kvm/kvm_main.c b/virt/kvm/kvm_main.c index 7b6084999424..6e8eb15dd30b 100644 --- a/virt/kvm/kvm_main.c +++ b/virt/kvm/kvm_main.c @@ -440,6 +440,15 @@ static int kvm_init_mmu_notifier(struct kvm *kvm) #endif /* CONFIG_MMU_NOTIFIER && KVM_ARCH_WANT_MMU_NOTIFIER */ +static void kvm_init_memslots_id(struct kvm *kvm) +{ + int i; + struct kvm_memslots *slots = kvm->memslots; + + for (i = 0; i < KVM_MEM_SLOTS_NUM; i++) + slots->memslots[i].id = i; +} + static struct kvm *kvm_create_vm(void) { int r, i; @@ -465,6 +474,7 @@ static struct kvm *kvm_create_vm(void) kvm->memslots = kzalloc(sizeof(struct kvm_memslots), GFP_KERNEL); if (!kvm->memslots) goto out_err_nosrcu; + kvm_init_memslots_id(kvm); if (init_srcu_struct(&kvm->srcu)) goto out_err_nosrcu; for (i = 0; i < KVM_NR_BUSES; i++) { @@ -630,15 +640,54 @@ static int kvm_create_dirty_bitmap(struct kvm_memory_slot *memslot) } #endif /* !CONFIG_S390 */ +static struct kvm_memory_slot * +search_memslots(struct kvm_memslots *slots, gfn_t gfn) +{ + struct kvm_memory_slot *memslot; + + kvm_for_each_memslot(memslot, slots) + if (gfn >= memslot->base_gfn && + gfn < memslot->base_gfn + memslot->npages) + return memslot; + + return NULL; +} + +static int cmp_memslot(const void *slot1, const void *slot2) +{ + struct kvm_memory_slot *s1, *s2; + + s1 = (struct kvm_memory_slot *)slot1; + s2 = (struct kvm_memory_slot *)slot2; + + if (s1->npages < s2->npages) + return 1; + if (s1->npages > s2->npages) + return -1; + + return 0; +} + +/* + * Sort the memslots base on its size, so the larger slots + * will get better fit. + */ +static void sort_memslots(struct kvm_memslots *slots) +{ + sort(slots->memslots, KVM_MEM_SLOTS_NUM, + sizeof(struct kvm_memory_slot), cmp_memslot, NULL); +} + void update_memslots(struct kvm_memslots *slots, struct kvm_memory_slot *new) { if (new) { int id = new->id; struct kvm_memory_slot *old = id_to_memslot(slots, id); + unsigned long npages = old->npages; *old = *new; - if (id >= slots->nmemslots) - slots->nmemslots = id + 1; + if (new->npages != npages) + sort_memslots(slots); } slots->generation++; @@ -980,14 +1029,7 @@ EXPORT_SYMBOL_GPL(kvm_is_error_hva); static struct kvm_memory_slot *__gfn_to_memslot(struct kvm_memslots *slots, gfn_t gfn) { - struct kvm_memory_slot *memslot; - - kvm_for_each_memslot(memslot, slots) - if (gfn >= memslot->base_gfn - && gfn < memslot->base_gfn + memslot->npages) - return memslot; - - return NULL; + return search_memslots(slots, gfn); } struct kvm_memory_slot *gfn_to_memslot(struct kvm *kvm, gfn_t gfn) @@ -998,20 +1040,13 @@ EXPORT_SYMBOL_GPL(gfn_to_memslot); int kvm_is_visible_gfn(struct kvm *kvm, gfn_t gfn) { - int i; - struct kvm_memslots *slots = kvm_memslots(kvm); - - for (i = 0; i < KVM_MEMORY_SLOTS; ++i) { - struct kvm_memory_slot *memslot = &slots->memslots[i]; + struct kvm_memory_slot *memslot = gfn_to_memslot(kvm, gfn); - if (memslot->flags & KVM_MEMSLOT_INVALID) - continue; + if (!memslot || memslot->id >= KVM_MEMORY_SLOTS || + memslot->flags & KVM_MEMSLOT_INVALID) + return 0; - if (gfn >= memslot->base_gfn - && gfn < memslot->base_gfn + memslot->npages) - return 1; - } - return 0; + return 1; } EXPORT_SYMBOL_GPL(kvm_is_visible_gfn); |