On 19/10/2019 08.37, Stefan Hajnoczi wrote: > There was no real virtio-mmio ABI change between Legacy and VIRTIO 1.0 > except that the Version field was incremented from 1 to 2. > > However, QEMU does not allow Legacy drivers to perform VIRTIO 1.0 > operations like accessing 64-bit feature bits. Since we will introduce > 64-bit feature bit support we need a way to differentiate between > virtio-mmio Version 1 and 2 to avoid upsetting QEMU when we operate in > Legacy mode. > > Stash away the Version field so later patches can change behavior > depending on the version. > > Signed-off-by: Stefan Hajnoczi <stefa...@redhat.com> > --- > tests/libqos/virtio-mmio.h | 1 + > tests/libqos/virtio-mmio.c | 3 +++ > 2 files changed, 4 insertions(+)
Reviewed-by: Thomas Huth <th...@redhat.com>
