diff --git a/tools/testing/selftests/kvm/memslot_perf_test.c b/tools/testing/selftests/kvm/memslot_perf_test.c
index daebc264de5a..2ad40f7c9c08 100644
--- a/tools/testing/selftests/kvm/memslot_perf_test.c
+++ b/tools/testing/selftests/kvm/memslot_perf_test.c
@@ -239,16 +239,52 @@ static struct vm_data *alloc_vm(void)
 	return data;
 }
 
+static bool check_slot_pages(uint32_t host_page_size, uint32_t guest_page_size,
+			     uint64_t pages_per_slot, uint64_t rempages)
+{
+	if (!pages_per_slot)
+		return false;
+
+	if ((pages_per_slot * guest_page_size) % host_page_size)
+		return false;
+
+	if ((rempages * guest_page_size) % host_page_size)
+		return false;
+
+	return true;
+}
+
+
+static uint64_t get_max_slots(struct vm_data *data, uint32_t host_page_size)
+{
+	uint32_t guest_page_size = data->vm->page_size;
+	uint64_t mempages, pages_per_slot, rempages;
+	uint64_t slots;
+
+	mempages = data->npages;
+	slots = data->nslots;
+	while (--slots > 1) {
+		pages_per_slot = mempages / slots;
+		rempages = mempages % pages_per_slot;
+		if (check_slot_pages(host_page_size, guest_page_size,
+				     pages_per_slot, rempages))
+			return slots + 1;	/* slot 0 is reserved */
+	}
+
+	return 0;
+}
+
 static bool prepare_vm(struct vm_data *data, int nslots, uint64_t *maxslots,
 		       void *guest_code, uint64_t mem_size,
 		       struct timespec *slot_runtime)
 {
 	uint64_t mempages, rempages;
 	uint64_t guest_addr;
-	uint32_t slot, guest_page_size;
+	uint32_t slot, host_page_size, guest_page_size;
 	struct timespec tstart;
 	struct sync_area *sync;
 
+	host_page_size = getpagesize();
 	guest_page_size = vm_guest_mode_params[VM_MODE_DEFAULT].page_size;
 	mempages = mem_size / guest_page_size;
 
@@ -260,12 +296,13 @@ static bool prepare_vm(struct vm_data *data, int nslots, uint64_t *maxslots,
 	TEST_ASSERT(data->npages > 1, "Can't test without any memory");
 	data->nslots = nslots;
 	data->pages_per_slot = data->npages / data->nslots;
-	if (!data->pages_per_slot) {
-		*maxslots = data->npages + 1;
+	rempages = data->npages % data->nslots;
+	if (!check_slot_pages(host_page_size, guest_page_size,
+			      data->pages_per_slot, rempages)) {
+		*maxslots = get_max_slots(data, host_page_size);
 		return false;
 	}
 
-	rempages = data->npages % data->nslots;
 	data->hva_slots = malloc(sizeof(*data->hva_slots) * data->nslots);
 	TEST_ASSERT(data->hva_slots, "malloc() fail");