From: Yuanhan Liu <yliu@fridaylinux.org>
To: Maxime Coquelin <maxime.coquelin@redhat.com>
Cc: dev@dpdk.org, tiwei.bie@intel.com, jianfeng.tan@intel.com,
lprosek@redhat.com, lersek@redhat.com
Subject: Re: [dpdk-dev] [PATCH v5 0/4] Vhost: fix mq=on but VIRTIO_NET_F_MQ not negotiated
Date: Mon, 8 Jan 2018 22:36:11 +0800 [thread overview]
Message-ID: <20180108143611.GD29540@yliu-mob> (raw)
In-Reply-To: <20171213085109.9891-1-maxime.coquelin@redhat.com>
On Wed, Dec 13, 2017 at 09:51:05AM +0100, Maxime Coquelin wrote:
> Hi,
>
> This fifth revision fixes bug reported by Tiwei, dev->virtqueue[$idx]
> wasn't reset to NULL at vq freeing time.
Applied to dpdk-next-virtio.
Thanks.
--yliu
>
> Having QEMU started with mq=on but guest driver not negotiating
> VIRTIO_NET_F_MQ feature ends up in the vhost device to never
> start. Indeed, more queues are created in the vhost backend than
> configured.
>
> Guest drivers known to not advertise the VIRTIO_NET_F_MQ feature are
> iPXE and OVMF Virtio-net drivers.
>
> Queues are created because before starting the guest, QEMU sends
> VHOST_USER_SET_VRING_CALL requests for all queues declared in QEMU
> command line. Also, once Virtio features negotiated, QEMU sends
> VHOST_USER_SET_VRING_ENABLE requests to disable all but the first
> queue pair.
>
> This series fixes this by destroying all but first queue pair in
> the backend if VIRTIO_NET_F_MQ isn't negotiated. First patches
> makes sure that VHOST_USER_SET_FEATURES request doesn't change
> Virtio features while the device is running, which should never
> happen as per the Virtio spec. This helps to make sure vitqueues
> aren't destroyed while being processed, but also protect from
> other illegal features changes (e.g. VIRTIO_NET_F_MRG_RXBUF).
>
> Changes since v4:
> =================
> - Fix dev->virtqueue[$ixd] not reset to NULL at VQ free time (Tiwei)
> Changes since v3:
> =================
> - Fix Virtio features = 0 case (Tiwei)
> Changes since v2:
> =================
> - Patch 2: Rework & fix VQs destruction loop (Laszlo)
> Changes since v1:
> =================
> - Patch 1: shift bits in the right direction (Ladi)
>
> Maxime Coquelin (4):
> vhost: prevent features to be changed while device is running
> vhost: propagate VHOST_USER_SET_FEATURES handling error
> vhost: extract virtqueue cleaning and freeing functions
> vhost: destroy unused virtqueues when multiqueue not negotiated
>
> lib/librte_vhost/vhost.c | 22 ++++++++++++----------
> lib/librte_vhost/vhost.h | 3 +++
> lib/librte_vhost/vhost_user.c | 40 ++++++++++++++++++++++++++++++++++++++--
> 3 files changed, 53 insertions(+), 12 deletions(-)
>
> --
> 2.14.3
prev parent reply other threads:[~2018-01-08 14:36 UTC|newest]
Thread overview: 10+ messages / expand[flat|nested] mbox.gz Atom feed top
2017-12-13 8:51 Maxime Coquelin
2017-12-13 8:51 ` [dpdk-dev] [PATCH v5 1/4] vhost: prevent features to be changed while device is running Maxime Coquelin
2017-12-13 8:51 ` [dpdk-dev] [PATCH v5 2/4] vhost: propagate VHOST_USER_SET_FEATURES handling error Maxime Coquelin
2017-12-13 8:51 ` [dpdk-dev] [PATCH v5 3/4] vhost: extract virtqueue cleaning and freeing functions Maxime Coquelin
2017-12-13 8:51 ` [dpdk-dev] [PATCH v5 4/4] vhost: destroy unused virtqueues when multiqueue not negotiated Maxime Coquelin
2017-12-13 9:15 ` [dpdk-dev] [PATCH v5 0/4] Vhost: fix mq=on but VIRTIO_NET_F_MQ " Paolo Bonzini
2017-12-13 10:11 ` Maxime Coquelin
2017-12-13 10:24 ` Paolo Bonzini
2017-12-13 11:23 ` Laszlo Ersek
2018-01-08 14:36 ` Yuanhan Liu [this message]
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