On Wed, Aug 27, 2014 at 07:46:46AM +0100, Stefan Hajnoczi wrote: > On Tue, Aug 26, 2014 at 10:16 PM, Andy Lutomirski <luto@xxxxxxxxxxxxxx> wrote: > > There are two outstanding issues. virtio_net warns if DMA debugging > > is on because it does DMA from the stack. (The warning is correct.) > > This also is likely to do something unpleasant to s390. > > (Maintainers are cc'd -- I don't know what to do about it.) > > This changes the semantics of vring and breaks existing guests when > bus address != physical address. Isn't that what this is suppose to fix? Right now the semantics of the vring is that bus address == physical address. > > Can you use a transport feature bit to indicate that bus addresses are > used? That way both approaches can be supported. > > Please also update the virtio specification: > https://tools.oasis-open.org/version-control/browse/wsvn/virtio/ > > Stefan -- To unsubscribe from this list: send the line "unsubscribe linux-s390" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
