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9pfs/virtio: implement response_buffer_size callback

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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_oss@crudebyte.com
Signed-off-by: Christian Schoenebeck <qemu_oss@crudebyte.com>
This commit is contained in:
Christian Schoenebeck
2026-06-12 20:22:52 +02:00
parent 4b615eaa1b
commit 12bcbdca8a
1 changed files with 10 additions and 0 deletions
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10
hw/9pfs/virtio-9p-device.c
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@@ -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)