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https://github.com/gnif/LookingGlass.git
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[porthole] process all messages sent from qemu
This commit is contained in:
Geoffrey McRae
parent
4c424cdbdf
commit
4dde82c646
@ -62,6 +62,9 @@ Mapping;
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struct PortholeClient
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{
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int socket;
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char rxbuf[1024];
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int rxbuf_len;
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PortholeMapEvent map_cb;
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PortholeUnmapEvent unmap_cb;
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PortholeDisconEvent discon_cb;
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@ -168,24 +171,26 @@ static void * porthole_socket_thread(void * opaque)
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while(handle->running)
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{
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PHMsg msg;
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struct iovec io =
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{
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.iov_base = &msg,
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.iov_len = sizeof(msg)
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.iov_base = &handle->rxbuf[handle->rxbuf_len],
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.iov_len = sizeof(handle->rxbuf) - handle->rxbuf_len
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};
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char buffer[256] = {0};
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char cbuffer[256] = {0};
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struct msghdr msghdr =
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{
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.msg_iov = &io,
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.msg_iovlen = 1,
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.msg_control = &buffer,
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.msg_controllen = sizeof(buffer)
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.msg_iov = &io,
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.msg_iovlen = 1,
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.msg_control = &cbuffer,
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.msg_controllen = sizeof(cbuffer)
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};
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if (recvmsg(handle->socket, &msghdr, 0) < 0)
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handle->rxbuf_len = recvmsg(handle->socket, &msghdr, 0);
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if (handle->rxbuf_len < 0)
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{
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handle->rxbuf_len = 0;
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if (errno == EAGAIN || errno == EWOULDBLOCK)
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continue;
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@ -195,96 +200,114 @@ static void * porthole_socket_thread(void * opaque)
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break;
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}
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switch(msg.msg)
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int pos = 0;
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while(pos != handle->rxbuf_len)
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{
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case PH_MSG_MAP:
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if (handle->current)
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{
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DEBUG_WARN("Started a new map before finishing the last one");
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porthole_free_map(handle->current);
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}
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PHMsg *msg = (PHMsg *)&handle->rxbuf[pos];
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handle->current = porthole_intmap_new();
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// check for an incomplete message
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if (pos + msg->len > handle->rxbuf_len)
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break;
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case PH_MSG_FD:
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assert(msg->len >= PH_MSG_BASE_SIZE);
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pos += msg->len;
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/* process the message */
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switch(msg->msg)
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{
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struct cmsghdr * cmsg = CMSG_FIRSTHDR(&msghdr);
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int * fds = (int *)CMSG_DATA(cmsg);
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porthole_sharedfd_new(handle, msg.u.fd.id, fds[0]);
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break;
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}
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case PH_MSG_SEGMENT:
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{
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if (!handle->current)
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DEBUG_FATAL("Segment sent before map, this is a bug in the guest porthole device or driver");
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porthole_segment_new(
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handle->fds,
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handle->current,
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msg.u.segment.fd_id,
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msg.u.segment.addr,
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msg.u.segment.size
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);
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break;
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}
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case PH_MSG_FINISH:
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if (!handle->current)
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DEBUG_FATAL("Finished map before starting one");
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handle->current->id = msg.u.finish.id;
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objectlist_push(handle->intmaps, handle->current);
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porthole_do_map(handle, handle->current, msg.u.finish.type);
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handle->current = NULL;
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break;
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case PH_MSG_UNMAP:
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{
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// notify the application of the unmap
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handle->unmap_cb(msg.u.unmap.id);
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// remove the PortholeMap object
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unsigned int count = objectlist_count(handle->maps);
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for(unsigned int i = 0; i < count; ++i)
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{
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PortholeMap *m = (PortholeMap *)objectlist_at(handle->maps, i);
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if (m->id == msg.u.unmap.id)
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case PH_MSG_MAP:
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if (handle->current)
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{
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objectlist_remove(handle->maps, i);
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break;
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DEBUG_WARN("Started a new map before finishing the last one");
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porthole_free_map(handle->current);
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}
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handle->current = porthole_intmap_new();
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break;
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case PH_MSG_FD:
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{
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struct cmsghdr * cmsg = CMSG_FIRSTHDR(&msghdr);
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int * fds = (int *)CMSG_DATA(cmsg);
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porthole_sharedfd_new(handle, msg->u.fd.id, fds[0]);
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break;
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}
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// remove the internal mapping object
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count = objectlist_count(handle->intmaps);
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for(unsigned int i = 0; i < count; ++i)
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case PH_MSG_SEGMENT:
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{
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Mapping *m = (Mapping *)objectlist_at(handle->intmaps, i);
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if (m->id == msg.u.unmap.id)
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if (!handle->current)
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DEBUG_FATAL("Segment sent before map, this is a bug in the guest porthole device or driver");
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porthole_segment_new(
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handle->fds,
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handle->current,
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msg->u.segment.fd_id,
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msg->u.segment.addr,
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msg->u.segment.size
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);
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break;
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}
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case PH_MSG_FINISH:
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if (!handle->current)
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DEBUG_FATAL("Finished map before starting one");
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handle->current->id = msg->u.finish.id;
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objectlist_push(handle->intmaps, handle->current);
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porthole_do_map(handle, handle->current, msg->u.finish.type);
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handle->current = NULL;
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break;
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case PH_MSG_UNMAP:
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{
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// notify the application of the unmap
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handle->unmap_cb(msg->u.unmap.id);
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// remove the PortholeMap object
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unsigned int count = objectlist_count(handle->maps);
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for(unsigned int i = 0; i < count; ++i)
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{
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objectlist_remove(handle->intmaps, i);
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break;
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PortholeMap *m = (PortholeMap *)objectlist_at(handle->maps, i);
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if (m->id == msg->u.unmap.id)
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{
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objectlist_remove(handle->maps, i);
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break;
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}
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}
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}
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// reply to the guest to allow it to continue
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uint32_t reply = PH_MSG_UNMAP;
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msghdr.msg_controllen = 0;
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io.iov_base = &reply;
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io.iov_len = sizeof(reply);
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if (sendmsg(handle->socket, &msghdr, 0) < 0)
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{
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DEBUG_ERROR("Failed to respond to the guest");
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handle->running = false;
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if (handle->discon_cb)
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handle->discon_cb();
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}
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// remove the internal mapping object
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count = objectlist_count(handle->intmaps);
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for(unsigned int i = 0; i < count; ++i)
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{
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Mapping *m = (Mapping *)objectlist_at(handle->intmaps, i);
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if (m->id == msg->u.unmap.id)
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{
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objectlist_remove(handle->intmaps, i);
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break;
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}
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}
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break;
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// reply to the guest to allow it to continue
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uint32_t reply = PH_MSG_UNMAP;
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msghdr.msg_controllen = 0;
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io.iov_base = &reply;
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io.iov_len = sizeof(reply);
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if (sendmsg(handle->socket, &msghdr, 0) < 0)
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{
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DEBUG_ERROR("Failed to respond to the guest");
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handle->running = false;
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if (handle->discon_cb)
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handle->discon_cb();
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}
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break;
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}
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}
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}
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// save any remaining bytes for the next recv
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handle->rxbuf_len -= pos;
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memmove(handle->rxbuf, &handle->rxbuf[pos], handle->rxbuf_len);
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}
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handle->running = false;
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@ -39,7 +39,8 @@ typedef struct {
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} __attribute__ ((packed)) PHMsgUnmap;
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typedef struct {
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uint32_t msg;
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uint8_t len; // the message length
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uint8_t msg; // the message ID
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union
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{
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PHMsgFd fd;
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@ -55,8 +56,9 @@ typedef struct {
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#define PH_MSG_FINISH 0x4 // finish of map sequence
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#define PH_MSG_UNMAP 0x5 // unmap a previous map
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#define PH_MSG_MAP_SIZE (sizeof(uint32_t))
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#define PH_MSG_FD_SIZE (sizeof(uint32_t) + sizeof(PHMsgFd))
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#define PH_MSG_SEGMENT_SIZE (sizeof(uint32_t) + sizeof(PHMsgSegment))
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#define PH_MSG_FINISH_SIZE (sizeof(uint32_t) + sizeof(PHMsgFinish))
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#define PH_MSG_UNMAP_SIZE (sizeof(uint32_t) + sizeof(PHMsgUnmap))
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#define PH_MSG_BASE_SIZE (sizeof(uint8_t) + sizeof(uint8_t))
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#define PH_MSG_MAP_SIZE (PH_MSG_BASE_SIZE)
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#define PH_MSG_FD_SIZE (PH_MSG_BASE_SIZE + sizeof(PHMsgFd))
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#define PH_MSG_SEGMENT_SIZE (PH_MSG_BASE_SIZE + sizeof(PHMsgSegment))
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#define PH_MSG_FINISH_SIZE (PH_MSG_BASE_SIZE + sizeof(PHMsgFinish))
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#define PH_MSG_UNMAP_SIZE (PH_MSG_BASE_SIZE + sizeof(PHMsgUnmap))
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