These are some utilty functions that will be used later on for storage
attributes migration.
Signed-off-by: Claudio Imbrenda <imbrenda@xxxxxxxxxxxxxxxxxx>
---
arch/s390/kvm/kvm-s390.c | 40 ++++++++++++++++++++++++++++++++++++++++
1 file changed, 40 insertions(+)
diff --git a/arch/s390/kvm/kvm-s390.c b/arch/s390/kvm/kvm-s390.c
index 6f17031..100ea15 100644
--- a/arch/s390/kvm/kvm-s390.c
+++ b/arch/s390/kvm/kvm-s390.c
@@ -764,6 +764,14 @@ static void kvm_s390_sync_request_broadcast(struct kvm *kvm, int req)
kvm_s390_sync_request(req, vcpu);
}
+static inline unsigned long *_cmma_bitmap(struct kvm_memory_slot *ms)
+{
+ unsigned long long len;
+
+ len = kvm_dirty_bitmap_bytes(ms) / sizeof(*ms->dirty_bitmap);
+ return ms->dirty_bitmap + len;
+}
+
/*
* Must be called with kvm->srcu held to avoid races on memslots, and with
* kvm->lock to avoid races with ourselves and kvm_s390_vm_stop_migration.
@@ -1512,6 +1520,38 @@ static long kvm_s390_set_skeys(struct kvm *kvm, struct kvm_s390_skeys *args)
#define KVM_S390_CMMA_SIZE_MAX ((u32)KVM_S390_SKEYS_MAX)
/*
+ * Similar to gfn_to_memslot, but returns a memslot also when the address falls
+ * in a hole. In that case a memslot near the hole is returned.
+ */
+static int gfn_to_memslot_approx(struct kvm *kvm, gfn_t gfn)
+{
+ struct kvm_memslots *slots = kvm_memslots(kvm);
+ int start = 0, end = slots->used_slots;
+ int slot = atomic_read(&slots->lru_slot);
+ struct kvm_memory_slot *memslots = slots->memslots;
+
+ if (gfn >= memslots[slot].base_gfn &&
+ gfn < memslots[slot].base_gfn + memslots[slot].npages)
+ return slot;
+
+ while (start < end) {
+ slot = start + (end - start) / 2;
+
+ if (gfn >= memslots[slot].base_gfn)
+ end = slot;
+ else
+ start = slot + 1;
+ }
+
+ if (gfn >= memslots[start].base_gfn &&
+ gfn < memslots[start].base_gfn + memslots[start].npages) {
+ atomic_set(&slots->lru_slot, start);
+ }
+
+ return start;
+}
+
+/*
* This function searches for the next page with dirty CMMA attributes, and
* saves the attributes in the buffer up to either the end of the buffer or
* until a block of at least KVM_S390_MAX_BIT_DISTANCE clean bits is found;
--
2.7.4
