[PATCH 5.11 012/342] vhost-vdpa: fix vm_flags for virtqueue doorbell mapping

[Greg Kroah-Hartman]

From: Jason Wang <jasowang@xxxxxxxxxx>

commit 3a3e0fad16d40a2aa68ddf7eea4acdf48b22dd44 upstream.

The virtqueue doorbell is usually implemented via registeres but we
don't provide the necessary vma->flags like VM_PFNMAP. This may cause
several issues e.g when userspace tries to map the doorbell via vhost
IOTLB, kernel may panic due to the page is not backed by page
structure. This patch fixes this by setting the necessary
vm_flags. With this patch, try to map doorbell via IOTLB will fail
with bad address.

Cc: stable@xxxxxxxxxxxxxxx
Fixes: ddd89d0a059d ("vhost_vdpa: support doorbell mapping via mmap")
Signed-off-by: Jason Wang <jasowang@xxxxxxxxxx>
Link: https://lore.kernel.org/r/20210413091557.29008-1-jasowang@xxxxxxxxxx
Signed-off-by: Michael S. Tsirkin <mst@xxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
 drivers/vhost/vdpa.c |    1 +
 1 file changed, 1 insertion(+)

--- a/drivers/vhost/vdpa.c
+++ b/drivers/vhost/vdpa.c
@@ -993,6 +993,7 @@ static int vhost_vdpa_mmap(struct file *
 	if (vma->vm_end - vma->vm_start != notify.size)
 		return -ENOTSUPP;
 
+	vma->vm_flags |= VM_IO | VM_PFNMAP | VM_DONTEXPAND | VM_DONTDUMP;
 	vma->vm_ops = &vhost_vdpa_vm_ops;
 	return 0;
 }