kvm/vfio: Constify struct kvm_device_ops

'struct kvm_device_ops' is not modified in this driver.

Constifying this structure moves some data to a read-only section, so
increases overall security, especially when the structure holds some
function pointers.

On a x86_64, with allmodconfig:
Before:
======
   text	   data	    bss	    dec	    hex	filename
   2605	    169	     16	   2790	    ae6	virt/kvm/vfio.o

After:
=====
   text	   data	    bss	    dec	    hex	filename
   2685	     89	     16	   2790	    ae6	virt/kvm/vfio.o

Signed-off-by: Christophe JAILLET <christophe.jaillet@wanadoo.fr>
Link: https://lore.kernel.org/r/e7361a1bb7defbb0f7056b884e83f8d75ac9fe21.1727517084.git.christophe.jaillet@wanadoo.fr
Signed-off-by: Alex Williamson <alex.williamson@redhat.com>

diff --git a/virt/kvm/vfio.c b/virt/kvm/vfio.c
index 388ae47..e72a6a1 100644 (file)
--- a/virt/kvm/vfio.c
+++ b/virt/kvm/vfio.c
@@ -353,7 +353,7 @@ static void kvm_vfio_release(struct kvm_device *dev)
 
 static int kvm_vfio_create(struct kvm_device *dev, u32 type);
 
-static struct kvm_device_ops kvm_vfio_ops = {
+static const struct kvm_device_ops kvm_vfio_ops = {
        .name = "kvm-vfio",
        .create = kvm_vfio_create,
        .release = kvm_vfio_release,