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Fri, 31 Jul 2020 18:20:47 +0000 Received: from abhmp0005.oracle.com (abhmp0005.oracle.com [141.146.116.11]) by userv0122.oracle.com (8.14.4/8.14.4) with ESMTP id 06VIKjnM020161; Fri, 31 Jul 2020 18:20:45 GMT Received: from jaraman-bur-1.us.oracle.com (/10.152.33.39) by default (Oracle Beehive Gateway v4.0) with ESMTP ; Fri, 31 Jul 2020 11:20:45 -0700 From: Jagannathan Raman To: qemu-devel@nongnu.org Subject: [PATCH v8 06/20] multi-process: define MPQemuMsg format and transmission functions Date: Fri, 31 Jul 2020 14:20:13 -0400 Message-Id: <50f84ecac23889920aeed397adb9317b8ea5a54b.1596217462.git.jag.raman@oracle.com> X-Mailer: git-send-email 1.8.3.1 In-Reply-To: References: In-Reply-To: References: MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit X-Proofpoint-Virus-Version: vendor=nai engine=6000 definitions=9699 signatures=668679 X-Proofpoint-Spam-Details: rule=notspam policy=default score=0 suspectscore=3 adultscore=0 bulkscore=0 malwarescore=0 mlxscore=0 spamscore=0 mlxlogscore=999 phishscore=0 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.12.0-2006250000 definitions=main-2007310137 X-Proofpoint-Virus-Version: vendor=nai engine=6000 definitions=9699 signatures=668679 X-Proofpoint-Spam-Details: rule=notspam policy=default score=0 mlxscore=0 bulkscore=0 suspectscore=3 spamscore=0 impostorscore=0 clxscore=1015 phishscore=0 priorityscore=1501 adultscore=0 mlxlogscore=999 malwarescore=0 lowpriorityscore=0 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.12.0-2006250000 definitions=main-2007310137 Received-SPF: pass client-ip=156.151.31.85; envelope-from=jag.raman@oracle.com; helo=userp2120.oracle.com X-detected-operating-system: by eggs.gnu.org: First seen = 2020/07/31 14:20:51 X-ACL-Warn: Detected OS = Linux 3.1-3.10 [fuzzy] X-Spam_score_int: -53 X-Spam_score: -5.4 X-Spam_bar: ----- X-Spam_report: (-5.4 / 5.0 requ) BAYES_00=-1.9, DKIMWL_WL_HIGH=-1, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, DKIM_VALID_EF=-0.1, RCVD_IN_DNSWL_MED=-2.3, RCVD_IN_MSPIKE_H3=-0.01, RCVD_IN_MSPIKE_WL=-0.01, SPF_HELO_PASS=-0.001, SPF_PASS=-0.001, UNPARSEABLE_RELAY=0.001 autolearn=ham autolearn_force=no X-Spam_action: no action X-BeenThere: qemu-devel@nongnu.org X-Mailman-Version: 2.1.23 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: elena.ufimtseva@oracle.com, fam@euphon.net, swapnil.ingle@nutanix.com, john.g.johnson@oracle.com, kraxel@redhat.com, jag.raman@oracle.com, quintela@redhat.com, mst@redhat.com, armbru@redhat.com, kanth.ghatraju@oracle.com, felipe@nutanix.com, thuth@redhat.com, ehabkost@redhat.com, konrad.wilk@oracle.com, dgilbert@redhat.com, alex.williamson@redhat.com, stefanha@redhat.com, thanos.makatos@nutanix.com, rth@twiddle.net, kwolf@redhat.com, berrange@redhat.com, mreitz@redhat.com, ross.lagerwall@citrix.com, marcandre.lureau@gmail.com, pbonzini@redhat.com Errors-To: qemu-devel-bounces+qemu-devel=archiver.kernel.org@nongnu.org Sender: "Qemu-devel" From: Elena Ufimtseva Defines MPQemuMsg, which is the message that is sent to the remote process. This message is sent over QIOChannel and is used to command the remote process to perform various tasks. Also defined the helper functions to send and receive messages over the QIOChannel Signed-off-by: Jagannathan Raman Signed-off-by: John G Johnson Signed-off-by: Elena Ufimtseva --- MAINTAINERS | 2 + include/io/mpqemu-link.h | 73 ++++++++++++++++++++ io/Makefile.objs | 2 + io/mpqemu-link.c | 175 +++++++++++++++++++++++++++++++++++++++++++++++ 4 files changed, 252 insertions(+) create mode 100644 include/io/mpqemu-link.h create mode 100644 io/mpqemu-link.c diff --git a/MAINTAINERS b/MAINTAINERS index 32e264e..41fe809 100644 --- a/MAINTAINERS +++ b/MAINTAINERS @@ -3044,6 +3044,8 @@ F: hw/pci-host/remote.c F: include/hw/pci-host/remote.h F: hw/i386/remote.c F: include/hw/i386/remote.h +F: io/mpqemu-link.c +F: include/io/mpqemu-link.h Build and test automation ------------------------- diff --git a/include/io/mpqemu-link.h b/include/io/mpqemu-link.h new file mode 100644 index 0000000..ae7008e --- /dev/null +++ b/include/io/mpqemu-link.h @@ -0,0 +1,73 @@ +/* + * Communication channel between QEMU and remote device process + * + * Copyright © 2018, 2020 Oracle and/or its affiliates. + * + * This work is licensed under the terms of the GNU GPL, version 2 or later. + * See the COPYING file in the top-level directory. + * + */ + +#ifndef MPQEMU_LINK_H +#define MPQEMU_LINK_H + +#include "qom/object.h" +#include "qemu/thread.h" +#include "io/channel.h" + +#define REMOTE_MAX_FDS 8 + +#define MPQEMU_MSG_HDR_SIZE offsetof(MPQemuMsg, data1.u64) + +/** + * MPQemuCmd: + * + * MPQemuCmd enum type to specify the command to be executed on the remote + * device. + */ +typedef enum { + INIT = 0, + MAX = INT_MAX, +} MPQemuCmd; + +/** + * Maximum size of data2 field in the message to be transmitted. + */ +#define MPQEMU_MSG_DATA_MAX 256 + +/** + * MPQemuMsg: + * @cmd: The remote command + * @bytestream: Indicates if the data to be shared is structured (data1) + * or unstructured (data2) + * @size: Size of the data to be shared + * @data1: Structured data + * @fds: File descriptors to be shared with remote device + * @data2: Unstructured data + * + * MPQemuMsg Format of the message sent to the remote device from QEMU. + * + */ +typedef struct { + int cmd; + int bytestream; + size_t size; + + union { + uint64_t u64; + } data1; + + int fds[REMOTE_MAX_FDS]; + int num_fds; + + /* Max size of data2 is MPQEMU_MSG_DATA_MAX */ + uint8_t *data2; +} MPQemuMsg; + +void mpqemu_msg_send(MPQemuMsg *msg, QIOChannel *ioc, Error **errp); +void mpqemu_msg_recv(MPQemuMsg *msg, QIOChannel *ioc, Error **errp); + +bool mpqemu_msg_valid(MPQemuMsg *msg); +void mpqemu_msg_cleanup(MPQemuMsg *msg); + +#endif diff --git a/io/Makefile.objs b/io/Makefile.objs index 9a20fce..5875ab0 100644 --- a/io/Makefile.objs +++ b/io/Makefile.objs @@ -10,3 +10,5 @@ io-obj-y += channel-util.o io-obj-y += dns-resolver.o io-obj-y += net-listener.o io-obj-y += task.o + +io-obj-$(CONFIG_MPQEMU) += mpqemu-link.o diff --git a/io/mpqemu-link.c b/io/mpqemu-link.c new file mode 100644 index 0000000..dcefa42 --- /dev/null +++ b/io/mpqemu-link.c @@ -0,0 +1,175 @@ +/* + * Communication channel between QEMU and remote device process + * + * Copyright © 2018, 2020 Oracle and/or its affiliates. + * + * This work is licensed under the terms of the GNU GPL, version 2 or later. + * See the COPYING file in the top-level directory. + * + */ + +#include "qemu/osdep.h" +#include "qemu-common.h" + +#include "qemu/module.h" +#include "io/mpqemu-link.h" +#include "qapi/error.h" +#include "qemu/iov.h" +#include "qemu/error-report.h" + +void mpqemu_msg_send(MPQemuMsg *msg, QIOChannel *ioc, Error **errp) +{ + Error *local_err = NULL; + struct iovec send[2]; + int *fds = NULL; + size_t nfds = 0; + + send[0].iov_base = msg; + send[0].iov_len = MPQEMU_MSG_HDR_SIZE; + + send[1].iov_base = msg->bytestream ? msg->data2 : (void *)&msg->data1; + send[1].iov_len = msg->size; + + if (msg->num_fds) { + nfds = msg->num_fds; + fds = msg->fds; + } + + (void)qio_channel_writev_full_all(ioc, send, G_N_ELEMENTS(send), fds, nfds, + &local_err); + if (local_err) { + error_propagate(errp, local_err); + } + + return; +} + +static int mpqemu_readv(QIOChannel *ioc, struct iovec *iov, int **fds, + size_t *nfds, Error **errp) +{ + struct iovec *l_iov = iov; + size_t *l_nfds = nfds; + unsigned int niov = 1; + int **l_fds = fds; + size_t size, len; + Error *local_err = NULL; + + size = iov->iov_len; + + while (size > 0) { + len = qio_channel_readv_full(ioc, l_iov, niov, l_fds, l_nfds, + &local_err); + + if (len == QIO_CHANNEL_ERR_BLOCK) { + if (qemu_in_coroutine()) { + qio_channel_yield(ioc, G_IO_IN); + } else { + qio_channel_wait(ioc, G_IO_IN); + } + continue; + } + + if (len <= 0) { + error_propagate(errp, local_err); + return -EIO; + } + + l_fds = NULL; + l_nfds = NULL; + + size -= len; + + (void)iov_discard_front(&l_iov, &niov, len); + } + + return iov->iov_len; +} + +void mpqemu_msg_recv(MPQemuMsg *msg, QIOChannel *ioc, Error **errp) +{ + Error *local_err = NULL; + int *fds = NULL; + struct iovec hdr, data; + size_t nfds = 0; + + hdr.iov_base = msg; + hdr.iov_len = MPQEMU_MSG_HDR_SIZE; + + if (mpqemu_readv(ioc, &hdr, &fds, &nfds, &local_err) < 0) { + error_propagate(errp, local_err); + return; + } + + if (msg->size > MPQEMU_MSG_DATA_MAX) { + error_setg(errp, "The message size is more than MPQEMU_MSG_DATA_MAX %d", + MPQEMU_MSG_DATA_MAX); + return; + } + + data.iov_base = g_malloc0(msg->size); + data.iov_len = msg->size; + + if (mpqemu_readv(ioc, &data, NULL, NULL, &local_err) < 0) { + error_propagate(errp, local_err); + g_free(data.iov_base); + return; + } + + if (msg->bytestream) { + msg->data2 = data.iov_base; + data.iov_base = NULL; + } else if (msg->size > sizeof(msg->data1)) { + error_setg(errp, "Invalid size for message"); + g_free(data.iov_base); + } else { + memcpy((void *)&msg->data1, data.iov_base, msg->size); + g_free(data.iov_base); + } + + msg->num_fds = nfds; + if (nfds) { + memcpy(msg->fds, fds, nfds * sizeof(int)); + } +} + +bool mpqemu_msg_valid(MPQemuMsg *msg) +{ + if (msg->cmd >= MAX && msg->cmd < 0) { + return false; + } + + if (msg->bytestream) { + if (!msg->data2) { + return false; + } + if (msg->data1.u64 != 0) { + return false; + } + } else { + if (msg->data2) { + return false; + } + } + + /* Verify FDs. */ + if (msg->num_fds >= REMOTE_MAX_FDS) { + return false; + } + + if (msg->num_fds > 0) { + for (int i = 0; i < msg->num_fds; i++) { + if (fcntl(msg->fds[i], F_GETFL) == -1) { + return false; + } + } + } + + return true; +} + +void mpqemu_msg_cleanup(MPQemuMsg *msg) +{ + if (msg->data2) { + free(msg->data2); + } +} -- 1.8.3.1