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Re: [Qemu-devel] [PATCH v1 0/4] Add feature to start QEMU without vhost-
From: |
Stefan Hajnoczi |
Subject: |
Re: [Qemu-devel] [PATCH v1 0/4] Add feature to start QEMU without vhost-user backend |
Date: |
Mon, 15 Jun 2015 15:12:28 +0100 |
User-agent: |
Mutt/1.5.23 (2014-03-12) |
On Thu, Jun 11, 2015 at 10:56:06AM +0900, Tetsuya Mukawa wrote:
> On 2015/05/29 13:42, Tetsuya Mukawa wrote:
> > Hi guys,
> >
> > Here are patches to add feature to start QEMU without vhost-user backend.
> > Currently, if we want to use vhost-user backend, the backend must start
> > before
> > QEMU. Also, if QEMU or the backend is closed unexpectedly, there is no way
> > to
> > recover without restarting both applications. Practically, it's not useful.
> >
> > This patch series adds following features.
> > - QEMU can start before the backend.
> > - QEMU or the backend can restart anytime.
> > connectivity will be recovered automatically, when app starts again.
> > (if QEMU is server, QEMU just wait reconnection)
> > while lost connection, link status of virtio-net device is down,
> > so virtio-net driver on the guest can know it
> >
> > To work like above, the patch introduces flags to specify features
> > vhost-user
> > backend will support.
> >
> > Here are examples.
> > ('backend_mrg_rxbuf' is an one of new flags. To know all, check the last
> > patch)
> >
> > * QEMU is configured as vhost-user client.
> > -chardev socket,id=chr0,path=/tmp/sock,reconnect=3 \
> > -netdev vhost-user,id=net0,chardev=chr0,vhostforce,backend_mrg_rxbuf \
> > -device virtio-net-pci,netdev=net0 \
> >
> > * QEMU is configured as vhost-user server.
> > -chardev socket,id=chr0,path=/tmp/sock,server,nowait \
> > -netdev vhost-user,id=net0,chardev=chr0,vhostforce,backend_mrg_rxbuf \
> > -device virtio-net-pci,netdev=net0 \
> >
> > When virtio-net device is configured by virtio-net driver, QEMU should know
> > vhost-user backend features. But if QEMU starts without the backend, QEMU
> > cannot
> > know it. So above the feature values specified by user will be used as
> > features
> > the backend will support.
> >
> > When connection between QEMU and the backend is established, QEMU checkes
> > feature
> > values of the backend to make sure the expected features are provided.
> > If it doesn't, the connection will be closed by QEMU.
> >
> > Regards,
> > Tetsuya
> >
> > ----------
> > Changes
> > ----------
> > - Changes from RFC patch
> > The last patch of this series was changed like below.
> > - Rebase to latest master.
> > - Remove needless has_backend_feature variable.
> > - Change user interface to be able to specify each feature by name.
> > - Add (Since 2.4) to schema file.
> > - Fix commit title and body.
> >
> >
> > Tetsuya Mukawa (4):
> > vhost-user: Add ability to know vhost-user backend disconnection
> > vhost-user: Shutdown vhost-user connection when wrong messages are
> > passed
> > vhost-user: Enable 'nowait' and 'reconnect' option
> > vhost-user: Add new option to specify vhost-user backend features
> >
> > hw/net/vhost_net.c | 6 ++-
> > hw/net/virtio-net.c | 13 +++++
> > hw/scsi/vhost-scsi.c | 2 +-
> > hw/virtio/vhost-user.c | 24 ++++++---
> > hw/virtio/vhost.c | 7 ++-
> > include/hw/virtio/vhost.h | 3 +-
> > include/hw/virtio/virtio-net.h | 1 +
> > include/net/net.h | 3 ++
> > include/net/vhost_net.h | 1 +
> > include/sysemu/char.h | 7 +++
> > net/net.c | 9 ++++
> > net/tap.c | 1 +
> > net/vhost-user.c | 69 ++++++++++++++++++++++++-
> > qapi-schema.json | 114
> > +++++++++++++++++++++++++++++++++++------
> > qemu-char.c | 15 ++++++
> > qemu-options.hx | 10 ++++
> > 16 files changed, 256 insertions(+), 29 deletions(-)
> >
>
> Ping.
>
> Could someone please review this patches?
> http://patchwork.ozlabs.org/project/qemu-devel/list/?submitter=66139
Nikolay, Jason, or Michael:
Can one of you please step up to become maintainer of net/vhost-user.c.
I don't follow vhost-user development much and can't give good review
feedback about the vhost-user specific aspects.
Please send a patch that adds you to the MAINTAINERS file for
net/vhost-user.c. Then either include merged patches in Michael's pull
requests or ask me (and in the future, Jason) to include them in net
pull requests.
Stefan
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