mshv: pass struct mshv_user_mem_region by reference

For unstated reasons, function mshv_partition_ioctl_set_memory passes
struct mshv_user_mem_region by value instead of by reference. Change
it to pass by reference.

Signed-off-by: Mukesh R <mrathor@linux.microsoft.com>
Reviewed-by: Michael Kelley <mhklinux@outlook.com>
Signed-off-by: Wei Liu <wei.liu@kernel.org>

Author: mrathor99

drivers/hv/mshv_root_main.c

@@ -1288,28 +1288,28 @@ static int mshv_prepare_pinned_region(struct mshv_mem_region *region)
  */
 static long
 mshv_map_user_memory(struct mshv_partition *partition,
-		     struct mshv_user_mem_region mem)
+		     struct mshv_user_mem_region *mem)
 {
 	struct mshv_mem_region *region;
 	struct vm_area_struct *vma;
 	bool is_mmio;
 	ulong mmio_pfn;
 	long ret;
 
-	if (mem.flags & BIT(MSHV_SET_MEM_BIT_UNMAP) ||
-	    !access_ok((const void __user *)mem.userspace_addr, mem.size))
+	if (mem->flags & BIT(MSHV_SET_MEM_BIT_UNMAP) ||
+	    !access_ok((const void __user *)mem->userspace_addr, mem->size))
 		return -EINVAL;
 
 	mmap_read_lock(current->mm);
-	vma = vma_lookup(current->mm, mem.userspace_addr);
+	vma = vma_lookup(current->mm, mem->userspace_addr);
 	is_mmio = vma ? !!(vma->vm_flags & (VM_IO | VM_PFNMAP)) : 0;
 	mmio_pfn = is_mmio ? vma->vm_pgoff : 0;
 	mmap_read_unlock(current->mm);
 
 	if (!vma)
 		return -EINVAL;
 
-	ret = mshv_partition_create_region(partition, &mem, &region,
+	ret = mshv_partition_create_region(partition, mem, &region,
 					   is_mmio);
 	if (ret)
 		return ret;
@@ -1354,25 +1354,25 @@ mshv_map_user_memory(struct mshv_partition *partition,
 /* Called for unmapping both the guest ram and the mmio space */
 static long
 mshv_unmap_user_memory(struct mshv_partition *partition,
-		       struct mshv_user_mem_region mem)
+		       struct mshv_user_mem_region *mem)
 {
 	struct mshv_mem_region *region;
 
-	if (!(mem.flags & BIT(MSHV_SET_MEM_BIT_UNMAP)))
+	if (!(mem->flags & BIT(MSHV_SET_MEM_BIT_UNMAP)))
 		return -EINVAL;
 
 	spin_lock(&partition->pt_mem_regions_lock);
 
-	region = mshv_partition_region_by_gfn(partition, mem.guest_pfn);
+	region = mshv_partition_region_by_gfn(partition, mem->guest_pfn);
 	if (!region) {
 		spin_unlock(&partition->pt_mem_regions_lock);
 		return -ENOENT;
 	}
 
 	/* Paranoia check */
-	if (region->start_uaddr != mem.userspace_addr ||
-	    region->start_gfn != mem.guest_pfn ||
-	    region->nr_pages != HVPFN_DOWN(mem.size)) {
+	if (region->start_uaddr != mem->userspace_addr ||
+	    region->start_gfn != mem->guest_pfn ||
+	    region->nr_pages != HVPFN_DOWN(mem->size)) {
 		spin_unlock(&partition->pt_mem_regions_lock);
 		return -EINVAL;
 	}
@@ -1403,9 +1403,9 @@ mshv_partition_ioctl_set_memory(struct mshv_partition *partition,
 		return -EINVAL;
 
 	if (mem.flags & BIT(MSHV_SET_MEM_BIT_UNMAP))
-		return mshv_unmap_user_memory(partition, mem);
+		return mshv_unmap_user_memory(partition, &mem);
 
-	return mshv_map_user_memory(partition, mem);
+	return mshv_map_user_memory(partition, &mem);
 }
 
 static long