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qemu-configs: update disable_vhost_net description

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Updated to better clarify this configuration option. Currently in QEMU
pre 1.9 release of Kata, vhost-net is used for the virtio-net backend.
This results in efficient network I/O performance, but does rely on the
backend running in ring0 (host kernel). Update comment to clarify this
trade-off for end-users.

Fixes: #2198

Signed-off-by: Eric Ernst <eric.ernst@intel.com>
This commit is contained in:
Eric Ernst 2019-11-13 14:48:59 -08:00
parent af73bb364e
commit 0c482b2557
2 changed files with 6 additions and 4 deletions
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5
cli/config/configuration-qemu-virtiofs.toml.in
View File

@ -212,9 +212,10 @@ enable_iothreads = @DEFENABLEIOTHREADS@
# Default false
#hotplug_vfio_on_root_bus = true
# If host doesn't support vhost_net, set to true. Thus we won't create vhost fds for nics.
# Default false
# If vhost-net backend for virtio-net is not desired, set to true. Default is false, which trades off
# security (vhost-net runs ring0) for network I/O performance.
#disable_vhost_net = true
#
# Default entropy source.
# The path to a host source of entropy (including a real hardware RNG)

5
cli/config/configuration-qemu.toml.in
View File

@ -213,9 +213,10 @@ enable_iothreads = @DEFENABLEIOTHREADS@
# Default false
#hotplug_vfio_on_root_bus = true
# If host doesn't support vhost_net, set to true. Thus we won't create vhost fds for nics.
# Default false
# If vhost-net backend for virtio-net is not desired, set to true. Default is false, which trades off
# security (vhost-net runs ring0) for network I/O performance.
#disable_vhost_net = true
#
# Default entropy source.
# The path to a host source of entropy (including a real hardware RNG)