[PATCH v2 0/7] vhost: support for cross endian guests

Greg Kurz
2015-04-02T13:16:37Z

Hi,

This patchset allows vhost to be used with legacy virtio when guest and host
have a different endianness. It is a complete rework of my initial post.

Patches 1 to 5 are preliminary work: we move the endianness check out of all
memory accessors to separate functions.

Patch 6 changes the semantics of the accessors so that they have explicit big
endian support.

Patch 7 brings the cross-endian feature, with the following changes since v1:
- conditionnal enablement through a kernel config
- introduction of a new vhost feature to advertise cross-endian to userspace

The tentative to fix vnet headers was dropped for the moment. As a consequnce,
vhost_net still fails to work with cross-endian. It will be fixed in another
patchset I'm currently working on.

---

Greg Kurz (7):
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: feature to set the vring endianness

drivers/net/macvtap.c | 11 +++++++++--
drivers/net/tun.c | 11 +++++++++--
drivers/vhost/Kconfig | 10 ++++++++++
drivers/vhost/net.c | 5 +++++
drivers/vhost/scsi.c | 4 ++++
drivers/vhost/test.c | 4 ++++
drivers/vhost/vhost.c | 19 +++++++++++++++++++
drivers/vhost/vhost.h | 32 +++++++++++++++++++++++++-------
include/linux/virtio_byteorder.h | 24 ++++++++++++++----------
include/linux/virtio_config.h | 19 +++++++++++++------
include/linux/vringh.h | 19 +++++++++++++------
include/uapi/linux/vhost.h | 10 ++++++++++
12 files changed, 135 insertions(+), 33 deletions(-)

--
Greg