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[Qemu-devel] [PATCH v4 4/6] vhost: move virtio 1.0 check to cross-endian
From: |
Greg Kurz |
Subject: |
[Qemu-devel] [PATCH v4 4/6] vhost: move virtio 1.0 check to cross-endian helper |
Date: |
Fri, 05 Feb 2016 11:45:49 +0100 |
User-agent: |
StGit/0.17.1-dirty |
Indeed vhost doesn't need to ask for vring endian fixing if the device is
virtio 1.0, since it is already handled by the in-kernel vhost driver. This
patch simply consolidates the logic into the existing helper.
Reviewed-by: Cornelia Huck <address@hidden>
Signed-off-by: Greg Kurz <address@hidden>
---
hw/virtio/vhost.c | 9 +++++----
1 file changed, 5 insertions(+), 4 deletions(-)
diff --git a/hw/virtio/vhost.c b/hw/virtio/vhost.c
index 6fea07c8ae15..bb17177f5e7e 100644
--- a/hw/virtio/vhost.c
+++ b/hw/virtio/vhost.c
@@ -751,6 +751,9 @@ static void vhost_log_stop(MemoryListener *listener,
static inline bool vhost_needs_vring_endian(VirtIODevice *vdev)
{
+ if (virtio_vdev_has_feature(vdev, VIRTIO_F_VERSION_1)) {
+ return false;
+ }
#ifdef TARGET_IS_BIENDIAN
#ifdef HOST_WORDS_BIGENDIAN
return !virtio_is_big_endian(vdev);
@@ -812,8 +815,7 @@ static int vhost_virtqueue_start(struct vhost_dev *dev,
return -errno;
}
- if (!virtio_vdev_has_feature(vdev, VIRTIO_F_VERSION_1) &&
- vhost_needs_vring_endian(vdev)) {
+ if (vhost_needs_vring_endian(vdev)) {
r = vhost_virtqueue_set_vring_endian_legacy(dev,
virtio_is_big_endian(vdev),
vhost_vq_index);
@@ -909,8 +911,7 @@ static void vhost_virtqueue_stop(struct vhost_dev *dev,
/* In the cross-endian case, we need to reset the vring endianness to
* native as legacy devices expect so by default.
*/
- if (!virtio_vdev_has_feature(vdev, VIRTIO_F_VERSION_1) &&
- vhost_needs_vring_endian(vdev)) {
+ if (vhost_needs_vring_endian(vdev)) {
r = vhost_virtqueue_set_vring_endian_legacy(dev,
!virtio_is_big_endian(vdev),
vhost_vq_index);
- [Qemu-devel] [PATCH v4 0/6] virtio/vhost cross-endian cleanup, Greg Kurz, 2016/02/05
- [Qemu-devel] [PATCH v4 1/6] virtio-net: use the backend cross-endian capabilities, Greg Kurz, 2016/02/05
- [Qemu-devel] [PATCH v4 2/6] vhost-net: revert support of cross-endian vnet headers, Greg Kurz, 2016/02/05
- [Qemu-devel] [PATCH v4 3/6] virtio: move cross-endian helper to vhost, Greg Kurz, 2016/02/05
- [Qemu-devel] [PATCH v4 4/6] vhost: move virtio 1.0 check to cross-endian helper,
Greg Kurz <=
- [Qemu-devel] [PATCH v4 5/6] vhost: simplify vhost_needs_vring_endian(), Greg Kurz, 2016/02/05
- [Qemu-devel] [PATCH v4 6/6] virtio: optimize virtio_access_is_big_endian() for little-endian targets, Greg Kurz, 2016/02/05
- Re: [Qemu-devel] [PATCH v4 0/6] virtio/vhost cross-endian cleanup, Laurent Vivier, 2016/02/05
- Re: [Qemu-devel] [PATCH v4 0/6] virtio/vhost cross-endian cleanup, Laurent Vivier, 2016/02/10