Re: [dpdk-dev] [PATCH 0/4 for 2.3] vhost-user live migration support

[Victor Kaplansky <victork@redhat.com>]

On Wed, Dec 02, 2015 at 11:43:09AM +0800, Yuanhan Liu wrote:
> This patch set adds the initial vhost-user live migration support.
> 
> The major task behind that is to log pages we touched during
> live migration. So, this patch is basically about adding vhost
> log support, and using it.
> 
> Patchset
> ========
> - Patch 1 handles VHOST_USER_SET_LOG_BASE, which tells us where
>   the dirty memory bitmap is.
>     
> - Patch 2 introduces a vhost_log_write() helper function to log
>   pages we are gonna change.
> 
> - Patch 3 logs changes we made to used vring.
> 
> - Patch 4 sets log_fhmfd protocol feature bit, which actually
>   enables the vhost-user live migration support.
> 
> A simple test guide (on same host)
> ==================================
> 
> The following test is based on OVS + DPDK. And here is guide
> to setup OVS + DPDK:
> 
>     http://wiki.qemu.org/Features/vhost-user-ovs-dpdk
> 
> 1. start ovs-vswitchd
> 
> 2. Add two ovs vhost-user port, say vhost0 and vhost1
> 
> 3. Start a VM1 to connect to vhost0. Here is my example:
> 
>    $QEMU -enable-kvm -m 1024 -smp 4 \
>        -chardev socket,id=char0,path=/var/run/openvswitch/vhost0  \
>        -netdev type=vhost-user,id=mynet1,chardev=char0,vhostforce \
>        -device virtio-net-pci,netdev=mynet1,mac=52:54:00:12:34:58 \
>        -object memory-backend-file,id=mem,size=1024M,mem-path=$HOME/hugetlbfs,share=on \
>        -numa node,memdev=mem -mem-prealloc \
>        -kernel $HOME/iso/vmlinuz -append "root=/dev/sda1" \
>        -hda fc-19-i386.img \
>        -monitor telnet::3333,server,nowait -curses
> 
> 4. run "ping $host" inside VM1
> 
> 5. Start VM2 to connect to vhost0, and marking it as the target
>    of live migration (by adding -incoming tcp:0:4444 option)
> 
>    $QEMU -enable-kvm -m 1024 -smp 4 \
>        -chardev socket,id=char0,path=/var/run/openvswitch/vhost1  \
>        -netdev type=vhost-user,id=mynet1,chardev=char0,vhostforce \
>        -device virtio-net-pci,netdev=mynet1,mac=52:54:00:12:34:58 \
>        -object memory-backend-file,id=mem,size=1024M,mem-path=$HOME/hugetlbfs,share=on \
>        -numa node,memdev=mem -mem-prealloc \
>        -kernel $HOME/iso/vmlinuz -append "root=/dev/sda1" \
>        -hda fc-19-i386.img \
>        -monitor telnet::3334,server,nowait -curses \
>        -incoming tcp:0:4444 
> 
> 6. connect to VM1 monitor, and start migration:
> 
>    > migrate tcp:0:4444
> 
> 7. After a while, you will find that VM1 has been migrated to VM2,
>    and the "ping" command continues running, perfectly.
> 
> 
> Note: this patch set has mostly been based on Victor Kaplansk's demo
> work (vhost-user-bridge) at QEMU project. I was thinking to add Victor
> as the co-author. Victor, what do you think of that? :)

Thanks for adding me to credits list!
-- Victor

> 
> Comments are welcome!
> 
> ---
> Yuanhan Liu (4):
>   vhost: handle VHOST_USER_SET_LOG_BASE request
>   vhost: introduce vhost_log_write
>   vhost: log vring changes
>   vhost: enable log_shmfd protocol feature
> 
>  lib/librte_vhost/rte_virtio_net.h             | 35 ++++++++++++++
>  lib/librte_vhost/vhost_rxtx.c                 | 70 ++++++++++++++++++---------
>  lib/librte_vhost/vhost_user/vhost-net-user.c  |  7 ++-
>  lib/librte_vhost/vhost_user/vhost-net-user.h  |  6 +++
>  lib/librte_vhost/vhost_user/virtio-net-user.c | 44 +++++++++++++++++
>  lib/librte_vhost/vhost_user/virtio-net-user.h |  5 +-
>  lib/librte_vhost/virtio-net.c                 |  4 ++
>  7 files changed, 145 insertions(+), 26 deletions(-)
> 
> -- 
> 1.9.0