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hw/virtio: Add support for VDPA network simulation devices

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This patch adds support for VDPA network simulation devices.
The device is developed based on virtio-net and tap backend,
and supports hardware live migration function.

For more details, please refer to "docs/system/devices/vdpa-net.rst"

Signed-off-by: Hao Chen <chenh@yusur.tech>
Message-Id: <20240221073802.2888022-1-chenh@yusur.tech>
Reviewed-by: Michael S. Tsirkin <mst@redhat.com>
Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
This commit is contained in:
Hao Chen 2024-02-21 15:38:02 +08:00 • committed by Michael S. Tsirkin
parent 043e127a12
commit cd341fd1ff
9 changed files with 399 additions and 3 deletions
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39
hw/virtio/virtio.c
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@ -3368,6 +3368,18 @@ static uint16_t virtio_queue_split_get_last_avail_idx(VirtIODevice *vdev,
return vdev->vq[n].last_avail_idx;
}
static uint32_t virtio_queue_split_get_vring_states(VirtIODevice *vdev,
int n)
{
struct VirtQueue *vq = &vdev->vq[n];
uint16_t avail, used;
avail = vq->last_avail_idx;
used = vq->used_idx;
return avail | (uint32_t)used << 16;
}
unsigned int virtio_queue_get_last_avail_idx(VirtIODevice *vdev, int n)
{
if (virtio_vdev_has_feature(vdev, VIRTIO_F_RING_PACKED)) {
@ -3377,6 +3389,33 @@ unsigned int virtio_queue_get_last_avail_idx(VirtIODevice *vdev, int n)
}
}
unsigned int virtio_queue_get_vring_states(VirtIODevice *vdev, int n)
{
if (virtio_vdev_has_feature(vdev, VIRTIO_F_RING_PACKED)) {
return -1;
} else {
return virtio_queue_split_get_vring_states(vdev, n);
}
}
static void virtio_queue_split_set_vring_states(VirtIODevice *vdev,
int n, uint32_t idx)
{
struct VirtQueue *vq = &vdev->vq[n];
vq->last_avail_idx = (uint16_t)(idx & 0xffff);
vq->shadow_avail_idx = (uint16_t)(idx & 0xffff);
vq->used_idx = (uint16_t)(idx >> 16);
}
void virtio_queue_set_vring_states(VirtIODevice *vdev, int n, uint32_t idx)
{
if (virtio_vdev_has_feature(vdev, VIRTIO_F_RING_PACKED)) {
return;
} else {
virtio_queue_split_set_vring_states(vdev, n, idx);
}
}
static void virtio_queue_packed_set_last_avail_idx(VirtIODevice *vdev,
int n, unsigned int idx)
{