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[PATCH 0/3] virtio-net: graceful drop of vhost for TAP
From: |
Yuri Benditovich |
Subject: |
[PATCH 0/3] virtio-net: graceful drop of vhost for TAP |
Date: |
Thu, 4 Feb 2021 22:29:12 +0200 |
This set of patches introduces graceful switch from tap-vhost to
tap-no-vhost depending on guest features. Before that the features
that vhost does not support were silently cleared in get_features.
This creates potential problem of migration from the machine where
some of virtio-net features are supported by the vhost kernel to the
machine where they are not supported (packed ring as an example).
Instead of silent masking of the features virtio-net gracefully
disables the vhost at set_features if some features acked by the
guest contradict with kernel vhost capabilities.
This set of patches also makes get_vhost_net() call (that used
everywhere) to always return actual result, i.e. initially it
returns non-NULL value and from the moment the vhost was disabled
the call will return NULL. Such a way we avoid any unexpected
calls to vhost functions.
Yuri Benditovich (3):
vhost-net: add VIRTIO_NET_F_HASH_REPORT to the list of kernel features
net: add ability to hide (disable) vhost_net
virtio-net: graceful fallback to vhost=off for tap netdev
hw/net/vhost_net.c | 5 +++-
hw/net/virtio-net.c | 58 ++++++++++++++++++++++++++++++++++++++-------
include/net/net.h | 1 +
3 files changed, 55 insertions(+), 9 deletions(-)
--
2.17.1