Hi, This patchset allows vhost to be used with legacy virtio when guest and host have a different endianness. It is compatible with modern virtio and can be fully compiled out through kernel config.
FWIW, I could flawlessly kexec/reboot guests from ppc64 to ppc64le and back. I could also migrate from a ppc64 to a ppc64le host and back. No regressions on x86 as expected. My experimental QEMU tree is here: https://github.com/gkurz/qemu.git vhost/cross-endian I'd be glad if this series could make it to 4.1. Cheers. --- Greg Kurz (8): virtio: introduce virtio_is_little_endian() helper tun: add tun_is_little_endian() helper macvtap: introduce macvtap_is_little_endian() helper vringh: introduce vringh_is_little_endian() helper vhost: introduce vhost_is_little_endian() helper virtio: add explicit big-endian support to memory accessors vhost: cross-endian support for legacy devices macvtap/tun: cross-endian support for little-endian hosts drivers/net/Kconfig | 14 ++++++ drivers/net/macvtap.c | 68 +++++++++++++++++++++++++++++- drivers/net/tun.c | 70 ++++++++++++++++++++++++++++++- drivers/vhost/Kconfig | 15 +++++++ drivers/vhost/vhost.c | 86 ++++++++++++++++++++++++++++++++++++++ drivers/vhost/vhost.h | 25 ++++++++--- include/linux/virtio_byteorder.h | 24 ++++++----- include/linux/virtio_config.h | 20 ++++++--- include/linux/vringh.h | 17 +++++--- include/uapi/linux/if_tun.h | 6 +++ include/uapi/linux/vhost.h | 12 +++++ 11 files changed, 324 insertions(+), 33 deletions(-) -- Greg -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majord...@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
