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vhost user: add rarp sending after live migration for legacy guest

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A new vhost user message is added to allow QEMU to ask to vhost user backend to
broadcast a fake RARP after live migration for guest without GUEST_ANNOUNCE
capability.

This new message is sent only if the backend supports the new
VHOST_USER_PROTOCOL_F_RARP protocol feature.
The payload of this new message is the MAC address of the guest (not known by
the backend). The MAC address is copied in the first 6 bytes of a u64 to avoid
to create a new payload message type.

This new message has no equivalent ioctl so a new callback is added in the
userOps structure to send the request.

Upon reception of this new message the vhost user backend must generate and
broadcast a fake RARP request to notify the migration is terminated.

Signed-off-by: Thibaut Collet <thibaut.collet@6wind.com>
[Rebased and fixed checkpatch errors - Marc-André]
Signed-off-by: Marc-André Lureau <marcandre.lureau@redhat.com>
Reviewed-by: Michael S. Tsirkin <mst@redhat.com>
Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
Tested-by: Thibaut Collet <thibaut.collet@6wind.com>
This commit is contained in:
Thibaut Collet 2015-10-09 17:17:32 +02:00 • committed by Michael S. Tsirkin
parent f6f56291de
commit 3e866365e1
6 changed files with 89 additions and 3 deletions
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15
docs/specs/vhost-user.txt
View file

@ -194,6 +194,7 @@ Protocol features
#define VHOST_USER_PROTOCOL_F_MQ 0
#define VHOST_USER_PROTOCOL_F_LOG_SHMFD 1
#define VHOST_USER_PROTOCOL_F_RARP 2
Message types
-------------
@ -381,3 +382,17 @@ Message types
Master payload: vring state description
Signal slave to enable or disable corresponding vring.
* VHOST_USER_SEND_RARP
Id: 19
Equivalent ioctl: N/A
Master payload: u64
Ask vhost user backend to broadcast a fake RARP to notify the migration
is terminated for guest that does not support GUEST_ANNOUNCE.
Only legal if feature bit VHOST_USER_F_PROTOCOL_FEATURES is present in
VHOST_USER_GET_FEATURES and protocol feature bit VHOST_USER_PROTOCOL_F_RARP
is present in VHOST_USER_GET_PROTOCOL_FEATURES.
The first 6 bytes of the payload contain the mac address of the guest to
allow the vhost user backend to construct and broadcast the fake RARP.