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[Qemu-devel] [PULL 24/38] vhost user: add support of live migration
From: |
Michael S. Tsirkin |
Subject: |
[Qemu-devel] [PULL 24/38] vhost user: add support of live migration |
Date: |
Wed, 21 Oct 2015 13:27:53 +0300 |
From: Thibaut Collet <address@hidden>
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 <address@hidden>
Reviewed-by: Michael S. Tsirkin <address@hidden>
Signed-off-by: Michael S. Tsirkin <address@hidden>
Tested-by: Thibaut Collet <address@hidden>
---
hw/net/vhost_net.c | 2 ++
net/vhost-user.c | 12 ++++++++++--
2 files changed, 12 insertions(+), 2 deletions(-)
diff --git a/hw/net/vhost_net.c b/hw/net/vhost_net.c
index 1ab4133..840f443 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
diff --git a/net/vhost-user.c b/net/vhost-user.c
index 9b38431..b067524 100644
--- a/net/vhost-user.c
+++ b/net/vhost-user.c
@@ -103,6 +103,15 @@ err:
return -1;
}
+static ssize_t vhost_user_receive(NetClientState *nc, const uint8_t *buf,
+ size_t size)
+{
+ /* Discard the request that is received and managed by backend
+ * by an other way.
+ */
+ return size;
+}
+
static void vhost_user_cleanup(NetClientState *nc)
{
VhostUserState *s = DO_UPCAST(VhostUserState, nc, nc);
@@ -132,6 +141,7 @@ static bool vhost_user_has_ufo(NetClientState *nc)
static NetClientInfo net_vhost_user_info = {
.type = NET_CLIENT_OPTIONS_KIND_VHOST_USER,
.size = sizeof(VhostUserState),
+ .receive = vhost_user_receive,
.cleanup = vhost_user_cleanup,
.has_vnet_hdr = vhost_user_has_vnet_hdr,
.has_ufo = vhost_user_has_ufo,
@@ -182,8 +192,6 @@ static int net_vhost_user_init(NetClientState *peer, const
char *device,
snprintf(nc->info_str, sizeof(nc->info_str), "vhost-user%d to %s",
i, chr->label);
- /* We don't provide a receive callback */
- nc->receive_disabled = 1;
nc->queue_index = i;
s = DO_UPCAST(VhostUserState, nc, nc);
--
MST
- [Qemu-devel] [PULL 15/38] vhost: document log resizing, (continued)
- [Qemu-devel] [PULL 15/38] vhost: document log resizing, Michael S. Tsirkin, 2015/10/21
- [Qemu-devel] [PULL 16/38] vhost: add vhost_set_log_base op, Michael S. Tsirkin, 2015/10/21
- [Qemu-devel] [PULL 10/38] linux-headers: add unistd.h, Michael S. Tsirkin, 2015/10/21
- [Qemu-devel] [PULL 17/38] vhost-user: add vhost_user_requires_shm_log(), Michael S. Tsirkin, 2015/10/21
- [Qemu-devel] [PULL 18/38] vhost: alloc shareable log, Michael S. Tsirkin, 2015/10/21
- [Qemu-devel] [PULL 19/38] vhost-user: send log shm fd along with log_base, Michael S. Tsirkin, 2015/10/21
- [Qemu-devel] [PULL 20/38] vhost-user: add a migration blocker, Michael S. Tsirkin, 2015/10/21
- [Qemu-devel] [PULL 22/38] vhost-user: document migration log, Michael S. Tsirkin, 2015/10/21
- [Qemu-devel] [PULL 21/38] vhost: use a function for each call, Michael S. Tsirkin, 2015/10/21
- [Qemu-devel] [PULL 23/38] net: add trace_vhost_user_event, Michael S. Tsirkin, 2015/10/21
- [Qemu-devel] [PULL 24/38] vhost user: add support of live migration,
Michael S. Tsirkin <=
- [Qemu-devel] [PULL 25/38] vhost user: add rarp sending after live migration for legacy guest, Michael S. Tsirkin, 2015/10/21
- [Qemu-devel] [PULL 26/38] vhost-user: use an enum helper for features mask, Michael S. Tsirkin, 2015/10/21
- [Qemu-devel] [PULL 27/38] vhost: add migration block if memfd failed, Michael S. Tsirkin, 2015/10/21
- [Qemu-devel] [PULL 28/38] vhost-user-test: move wait_for_fds() out, Michael S. Tsirkin, 2015/10/21
- [Qemu-devel] [PULL 29/38] vhost-user-test: remove useless static check, Michael S. Tsirkin, 2015/10/21
- [Qemu-devel] [PULL 30/38] vhost-user-test: wrap server in TestServer struct, Michael S. Tsirkin, 2015/10/21
- [Qemu-devel] [PULL 31/38] vhost-user-test: learn to tweak various qemu arguments, Michael S. Tsirkin, 2015/10/21
- [Qemu-devel] [PULL 32/38] vhost-user-test: add live-migration test, Michael S. Tsirkin, 2015/10/21
- [Qemu-devel] [PULL 33/38] vhost-user-test: check ownership during migration, Michael S. Tsirkin, 2015/10/21
- [Qemu-devel] [PULL 34/38] seccomp: add memfd_create to whitelist, Michael S. Tsirkin, 2015/10/21