Virtio modern has the common data organized in little endian, but on powerpc64 BE it was reading and writing in the wrong endian. Submitted by: Leonardo Bianconi <leonardo.bianconi@eldorado.org.br> Reviewed by: bryanv, alfredo Sponsored by: Eldorado Research Institute (eldorado.org.br) MFC after: 1 week Differential Revision: https://reviews.freebsd.org/D28947