virtio/net: Fix feature selection
Move VHOST_GET_FEATURES to get_host_features() so the guest is aware of
what will actually be supported. This removes the invalid guess about
VIRTIO_NET_F_MRG_RXBUF (if vhost didn't support it, we shouldn't let the
guest negotiate it).
Note the masking of VHOST_NET_F_VIRTIO_NET_HDR when handing features to
vhost. Unfortunately the vhost-net driver interprets VIRTIO_F_ANY_LAYOUT
as VHOST_NET_F_VIRTIO_NET_HDR, which is specific to vhost and forces
vhost-net to supply the vnet header. Since this is done by tap, we don't
want to set the bit.
Signed-off-by: Jean-Philippe Brucker <jean-philippe@linaro.org>
Link: https://lore.kernel.org/r/20230606130426.978945-12-jean-philippe@linaro.org
Signed-off-by: Will Deacon <will@kernel.org>
1 file changed
