On Fri, Dec 12, 2014 at 11:17:47AM +0100, Cornelia Huck wrote: > On Fri, 12 Dec 2014 11:06:40 +0100 > Thomas Huth <[email protected]> wrote: > > > On Thu, 11 Dec 2014 14:25:07 +0100 > > Cornelia Huck <[email protected]> wrote: [snip] > > > vdev->queue_sel = 0; > > > vdev->status = 0; > > > vdev->isr = 0; > > > @@ -924,7 +925,8 @@ void virtio_save(VirtIODevice *vdev, QEMUFile *f) > > > qemu_put_8s(f, &vdev->status); > > > qemu_put_8s(f, &vdev->isr); > > > qemu_put_be16s(f, &vdev->queue_sel); > > > - qemu_put_be32s(f, &vdev->guest_features); > > > + /* XXX features >= 32 */ > > > + qemu_put_be32s(f, (uint32_t *)&vdev->guest_features); > > > > Casting a uint64_t* to a uint32_t* here sounds very wrong - this likely > > only works on little endian sytems, but certainly not on big-endian > > systems. > > If you do not want to extend this for 64-bit right from the beginning, > > I think you've got to use a temporary 32-bit variable to get this right. > > Hm... always store the old 32 bits here, then store the new 32 bits > later? Should be able to get that compatible.
I think Thomas' point is that since vdev->guest_features has changed
to a uint64_t, the "old" bits are now in the second 32-bit half on a
BE system.
Or maybe I'm misunderstanding your reply.
--
David Gibson | I'll have my music baroque, and my code
david AT gibson.dropbear.id.au | minimalist, thank you. NOT _the_ _other_
| _way_ _around_!
http://www.ozlabs.org/~dgibson
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