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| author | Felipe Franciosi <felipe@nutanix.com> | 2017-06-14 18:44:38 +0100 |
|---|---|---|
| committer | Michael S. Tsirkin <mst@redhat.com> | 2017-08-02 00:13:25 +0300 |
| commit | 5df04f1762ef78c08fd69e19dcedf3d9ba8c9b86 (patch) | |
| tree | eeb55bb6c1f81c111cdf0d521fc91adb1daf4887 /hw/virtio/vhost-user.c | |
| parent | 08b9e0ba623c4468fe94026a9bdd086526ef62f0 (diff) | |
| download | qemu-5df04f1762ef78c08fd69e19dcedf3d9ba8c9b86.zip | |
vhost-user: fix legacy cross-endian configurations
Currently, vhost-user does not implement any means for notifying the
backend about guest endianess. This commit introduces a new message
called VHOST_USER_SET_VRING_ENDIAN which is analogous to the ioctl()
called VHOST_SET_VRING_ENDIAN used for kernel vhost backends. Such
message is necessary for backends supporting legacy (pre-1.0) virtio
devices running in big-endian guests.
Signed-off-by: Felipe Franciosi <felipe@nutanix.com>
Signed-off-by: Mike Cui <cui@nutanix.com>
Diffstat (limited to 'hw/virtio/vhost-user.c')
| -rw-r--r-- | hw/virtio/vhost-user.c | 23 |
1 files changed, 21 insertions, 2 deletions
diff --git a/hw/virtio/vhost-user.c b/hw/virtio/vhost-user.c index 2203011125..093675ed98 100644 --- a/hw/virtio/vhost-user.c +++ b/hw/virtio/vhost-user.c @@ -33,6 +33,7 @@ enum VhostUserProtocolFeature { VHOST_USER_PROTOCOL_F_REPLY_ACK = 3, VHOST_USER_PROTOCOL_F_NET_MTU = 4, VHOST_USER_PROTOCOL_F_SLAVE_REQ = 5, + VHOST_USER_PROTOCOL_F_CROSS_ENDIAN = 6, VHOST_USER_PROTOCOL_F_MAX }; @@ -63,6 +64,7 @@ typedef enum VhostUserRequest { VHOST_USER_NET_SET_MTU = 20, VHOST_USER_SET_SLAVE_REQ_FD = 21, VHOST_USER_IOTLB_MSG = 22, + VHOST_USER_SET_VRING_ENDIAN = 23, VHOST_USER_MAX } VhostUserRequest; @@ -367,8 +369,25 @@ static int vhost_user_set_vring_addr(struct vhost_dev *dev, static int vhost_user_set_vring_endian(struct vhost_dev *dev, struct vhost_vring_state *ring) { - error_report("vhost-user trying to send unhandled ioctl"); - return -1; + bool cross_endian = virtio_has_feature(dev->protocol_features, + VHOST_USER_PROTOCOL_F_CROSS_ENDIAN); + VhostUserMsg msg = { + .request = VHOST_USER_SET_VRING_ENDIAN, + .flags = VHOST_USER_VERSION, + .payload.state = *ring, + .size = sizeof(msg.payload.state), + }; + + if (!cross_endian) { + error_report("vhost-user trying to send unhandled ioctl"); + return -1; + } + + if (vhost_user_write(dev, &msg, NULL, 0) < 0) { + return -1; + } + + return 0; } static int vhost_set_vring(struct vhost_dev *dev, |