From: Christian Schoenebeck <[email protected]> Add and implement the response_buffer_size callback for the virtio transport.
Returns the actual current virtio response buffer size for the supplied PDU, which will be used as safety guard for limiting the response size when generating a 9p response. Link: https://lore.kernel.org/qemu-devel/5bbed2768f7a0da8fa2be183e75928c5d1ef691d.1781287774.git.qemu_...@crudebyte.com Signed-off-by: Christian Schoenebeck <[email protected]> (cherry picked from commit 12bcbdca8ae9fcd5fec093e8ef5e70521e85e889) Signed-off-by: Michael Tokarev <[email protected]> diff --git a/hw/9pfs/virtio-9p-device.c b/hw/9pfs/virtio-9p-device.c index c795afa6440..f3fabf2abd3 100644 --- a/hw/9pfs/virtio-9p-device.c +++ b/hw/9pfs/virtio-9p-device.c @@ -198,6 +198,15 @@ static size_t virtio_9p_msize_limit(V9fsState *s) return (VIRTQUEUE_MAX_SIZE - 2) * guestPageSize; } +static size_t virtio_9p_response_buffer_size(V9fsPDU *pdu) +{ + V9fsState *s = pdu->s; + V9fsVirtioState *v = container_of(s, V9fsVirtioState, state); + VirtQueueElement *elem = v->elems[pdu->idx]; + + return iov_size(elem->in_sg, elem->in_num); +} + static const V9fsTransport virtio_9p_transport = { .pdu_vmarshal = virtio_pdu_vmarshal, .pdu_vunmarshal = virtio_pdu_vunmarshal, @@ -205,6 +214,7 @@ static const V9fsTransport virtio_9p_transport = { .init_out_iov_from_pdu = virtio_init_out_iov_from_pdu, .push_and_notify = virtio_9p_push_and_notify, .msize_limit = virtio_9p_msize_limit, + .response_buffer_size = virtio_9p_response_buffer_size, }; static void virtio_9p_device_realize(DeviceState *dev, Error **errp) -- 2.47.3
