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[Qemu-devel] [PATCH v4 0/2] virtio: Move host features to backends
From: |
shannon . zhao |
Subject: |
[Qemu-devel] [PATCH v4 0/2] virtio: Move host features to backends |
Date: |
Tue, 28 Apr 2015 19:51:11 +0800 |
From: Shannon Zhao <address@hidden>
The reason to do this is that the virtio-net-device can't expose host
features to guest while using virtio-mmio. So the performance is low.
The virtio-*-pci, virtio-*-s390, and virtio-*-ccw already have the
ability to forward property accesses to the backend child, by calling
*_virtio_*_instance_init -> qdev_alias_all_properties. So if we move the
host features to backends, it doesn't break the backwards compatibility
for virtio-*-pci, virtio-*-s390, and virtio-*-ccw.
Here we move the host features to backends, involving
DEFINE_VIRTIO_NET_FEATURES, DEFINE_VIRTIO_SCSI_FEATURES. So the
virtio-mmio devices could have the host freatures, and this has a great
performance improvement to virtio-mmio, especially to virtio-net-device.
changes since v3:
* detail the changes in commit log
* don't expose virtio_net_set_config_size
changes since v2:
* move virtio_net_set_config_size to virtio-net (Cornelia)
changes since v1:
* drop unnecessary change of adding device_plugged hook for
virtio-ccw and s390-virtio-bus (Cornelia)
Shannon Zhao (2):
virtio-net: Move DEFINE_VIRTIO_NET_FEATURES to virtio-net
virtio-scsi: Move DEFINE_VIRTIO_SCSI_FEATURES to virtio-scsi
hw/net/virtio-net.c | 7 ++++++-
hw/s390x/s390-virtio-bus.c | 3 ---
hw/s390x/virtio-ccw.c | 3 ---
hw/scsi/virtio-scsi.c | 5 +++++
hw/virtio/virtio-pci.c | 3 ---
include/hw/virtio/virtio-net.h | 2 +-
include/hw/virtio/virtio-scsi.h | 1 +
7 files changed, 13 insertions(+), 11 deletions(-)
--
2.1.0
- [Qemu-devel] [PATCH v4 0/2] virtio: Move host features to backends,
shannon . zhao <=
Re: [Qemu-devel] [PATCH v4 0/2] virtio: Move host features to backends, Peter Maydell, 2015/04/28