[PATCH 14/14] vhost-vdpa: convert mmap hook to mmap_prepare

["Lorenzo Stoakes (ARM)" <ljs@kernel.org>]

Move from the deprecated mmap hook to the new mmap_prepare hook. The hook
only validates the request and sets the VMA flags, operations and page
protection.

Signed-off-by: Lorenzo Stoakes (ARM) <ljs@kernel.org>
---
 drivers/vhost/vdpa.c | 23 ++++++++++++-----------
 1 file changed, 12 insertions(+), 11 deletions(-)

diff --git a/drivers/vhost/vdpa.c b/drivers/vhost/vdpa.c
index ff7d90719171..993b2d7c8927 100644
--- a/drivers/vhost/vdpa.c
+++ b/drivers/vhost/vdpa.c
@@ -1573,19 +1573,19 @@ static const struct vm_operations_struct vhost_vdpa_vm_ops = {
 	.fault = vhost_vdpa_fault,
 };
 
-static int vhost_vdpa_mmap(struct file *file, struct vm_area_struct *vma)
+static int vhost_vdpa_mmap_prepare(struct vm_area_desc *desc)
 {
-	struct vhost_vdpa *v = vma->vm_file->private_data;
+	struct vhost_vdpa *v = desc->file->private_data;
 	struct vdpa_device *vdpa = v->vdpa;
 	const struct vdpa_config_ops *ops = vdpa->config;
 	struct vdpa_notification_area notify;
-	unsigned long index = vma->vm_pgoff;
+	unsigned long index = desc->pgoff;
 
-	if (vma->vm_end - vma->vm_start != PAGE_SIZE)
+	if (vma_desc_size(desc) != PAGE_SIZE)
 		return -EINVAL;
-	if ((vma->vm_flags & VM_SHARED) == 0)
+	if (!vma_desc_test(desc, VMA_SHARED_BIT))
 		return -EINVAL;
-	if (vma->vm_flags & VM_READ)
+	if (vma_desc_test(desc, VMA_READ_BIT))
 		return -EINVAL;
 	if (!ops->get_vq_notification)
 		return -ENOTSUPP;
@@ -1598,12 +1598,13 @@ static int vhost_vdpa_mmap(struct file *file, struct vm_area_struct *vma)
 		return -EINVAL;
 	if (notify.addr & (PAGE_SIZE - 1))
 		return -EINVAL;
-	if (vma->vm_end - vma->vm_start != notify.size)
+	if (vma_desc_size(desc) != notify.size)
 		return -ENOTSUPP;
 
-	vma->vm_page_prot = pgprot_noncached(vma->vm_page_prot);
-	vm_flags_set(vma, VM_IO | VM_PFNMAP | VM_DONTEXPAND | VM_DONTDUMP);
-	vma->vm_ops = &vhost_vdpa_vm_ops;
+	desc->page_prot = pgprot_noncached(desc->page_prot);
+	vma_desc_set_flags(desc, VMA_IO_BIT, VMA_PFNMAP_BIT, VMA_DONTEXPAND_BIT,
+			   VMA_DONTDUMP_BIT);
+	desc->vm_ops = &vhost_vdpa_vm_ops;
 	return 0;
 }
 #endif /* CONFIG_MMU */
@@ -1615,7 +1616,7 @@ static const struct file_operations vhost_vdpa_fops = {
 	.write_iter	= vhost_vdpa_chr_write_iter,
 	.unlocked_ioctl	= vhost_vdpa_unlocked_ioctl,
 #ifdef CONFIG_MMU
-	.mmap		= vhost_vdpa_mmap,
+	.mmap_prepare	= vhost_vdpa_mmap_prepare,
 #endif /* CONFIG_MMU */
 	.compat_ioctl	= compat_ptr_ioctl,
 };

-- 
2.56.0