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-rw-r--r--virt/kvm/kvm_main.c79
1 files changed, 57 insertions, 22 deletions
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);