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| author | Thibaut Collet <thibaut.collet@6wind.com> | 2015-10-09 17:17:31 +0200 |
|---|---|---|
| committer | Michael S. Tsirkin <mst@redhat.com> | 2015-10-22 14:34:49 +0300 |
| commit | f6f56291de879827766d17b172465d4377ad2c11 (patch) | |
| tree | 7ecbe114c72953fb99d4395386a75dc264ab287f /hw/net | |
| parent | 69b32a6ce4e1a6096a496996fcda833eb54e81b9 (diff) | |
| download | qemu-f6f56291de879827766d17b172465d4377ad2c11.tar.gz qemu-f6f56291de879827766d17b172465d4377ad2c11.tar.bz2 qemu-f6f56291de879827766d17b172465d4377ad2c11.zip | |
vhost user: add support of live migration
Some vhost user backends are able to support live migration.
To provide this service the following features must be added:
1. Add the VIRTIO_NET_F_GUEST_ANNOUNCE capability to vhost-net when netdev
backend is vhost-user.
2. Provide a nop receive callback to vhost-user.
This callback is called by:
* qemu_announce_self after a migration to send fake RARP to avoid network
outage for peers talking to the migrated guest.
- For guest with GUEST_ANNOUNCE capabilities, guest already sends GARP
when the bit VIRTIO_NET_S_ANNOUNCE is set.
=> These packets must be discarded.
- For guest without GUEST_ANNOUNCE capabilities, migration termination
is notified when the guest sends packets.
=> These packets can be discarded.
* virtio_net_tx_bh with a dummy boot to send fake bootp/dhcp request.
BIOS guest manages virtio driver to send 4 bootp/dhcp request in case of
dummy boot.
=> These packets must be discarded.
Signed-off-by: Thibaut Collet <thibaut.collet@6wind.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>
Diffstat (limited to 'hw/net')
| -rw-r--r-- | hw/net/vhost_net.c | 2 |
1 files changed, 2 insertions, 0 deletions
diff --git a/hw/net/vhost_net.c b/hw/net/vhost_net.c index 1ab4133769..840f443065 100644 --- a/hw/net/vhost_net.c +++ b/hw/net/vhost_net.c @@ -85,6 +85,8 @@ static const int user_feature_bits[] = { VIRTIO_NET_F_CTRL_MAC_ADDR, VIRTIO_NET_F_CTRL_GUEST_OFFLOADS, + VIRTIO_NET_F_GUEST_ANNOUNCE, + VIRTIO_NET_F_MQ, VHOST_INVALID_FEATURE_BIT |