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vhost: Add vhost_svq_valid_features to shadow vq

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This allows SVQ to negotiate features with the guest and the device. For
the device, SVQ is a driver. While this function bypasses all
non-transport features, it needs to disable the features that SVQ does
not support when forwarding buffers. This includes packed vq layout,
indirect descriptors or event idx.

Future changes can add support to offer more features to the guest,
since the use of VirtQueue gives this for free. This is left out at the
moment for simplicity.

Signed-off-by: Eugenio Pérez <eperezma@redhat.com>
Acked-by: Michael S. Tsirkin <mst@redhat.com>
Signed-off-by: Jason Wang <jasowang@redhat.com>
This commit is contained in:
Eugenio Pérez 2022-03-14 18:34:44 +01:00 • committed by Jason Wang
parent a8ac88585d
commit 4725a4181b
3 changed files with 61 additions and 0 deletions
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15
hw/virtio/vhost-vdpa.c
View file

@ -348,11 +348,26 @@ static int vhost_vdpa_init_svq(struct vhost_dev *hdev, struct vhost_vdpa *v,
Error **errp)
{
g_autoptr(GPtrArray) shadow_vqs = NULL;
uint64_t dev_features, svq_features;
int r;
bool ok;
if (!v->shadow_vqs_enabled) {
return 0;
}
r = hdev->vhost_ops->vhost_get_features(hdev, &dev_features);
if (r != 0) {
error_setg_errno(errp, -r, "Can't get vdpa device features");
return r;
}
svq_features = dev_features;
ok = vhost_svq_valid_features(svq_features, errp);
if (unlikely(!ok)) {
return -1;
}
shadow_vqs = g_ptr_array_new_full(hdev->nvqs, vhost_svq_free);
for (unsigned n = 0; n < hdev->nvqs; ++n) {
g_autoptr(VhostShadowVirtqueue) svq = vhost_svq_new();