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virtio-mem: Don't rely on implicit compiler padding for requests

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The compiler will add padding after the last member, make that explicit.
The size of a request is always 24 bytes. The size of a response always
10 bytes. Add compile-time checks.

Cc: "Michael S. Tsirkin" <mst@redhat.com>
Cc: Pankaj Gupta <pankaj.gupta.linux@gmail.com>
Cc: teawater <teawaterz@linux.alibaba.com>
Signed-off-by: David Hildenbrand <david@redhat.com>
Link: https://lore.kernel.org/r/20200515101402.16597-1-david@redhat.com
Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
This commit is contained in:
David Hildenbrand 2020-05-15 12:14:02 +02:00 committed by Michael S. Tsirkin
parent 72f9525ad7
commit fce8afd76e
2 changed files with 6 additions and 0 deletions
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3
drivers/virtio/virtio_mem.c
View file

@ -1770,6 +1770,9 @@ static int virtio_mem_probe(struct virtio_device *vdev)
struct virtio_mem *vm;
int rc = -EINVAL;
BUILD_BUG_ON(sizeof(struct virtio_mem_req) != 24);
BUILD_BUG_ON(sizeof(struct virtio_mem_resp) != 10);
vdev->priv = vm = kzalloc(sizeof(*vm), GFP_KERNEL);
if (!vm)
return -ENOMEM;

3
include/uapi/linux/virtio_mem.h
View file

@ -103,16 +103,19 @@
struct virtio_mem_req_plug {
__virtio64 addr;
__virtio16 nb_blocks;
__virtio16 padding[3];
};
struct virtio_mem_req_unplug {
__virtio64 addr;
__virtio16 nb_blocks;
__virtio16 padding[3];
};
struct virtio_mem_req_state {
__virtio64 addr;
__virtio16 nb_blocks;
__virtio16 padding[3];
};
struct virtio_mem_req {