From nobody Tue Feb 10 02:02:28 2026 Delivered-To: importer@patchew.org Received-SPF: pass (zohomail.com: domain of gnu.org designates 209.51.188.17 as permitted sender) client-ip=209.51.188.17; envelope-from=qemu-devel-bounces+importer=patchew.org@nongnu.org; helo=lists.gnu.org; Authentication-Results: mx.zohomail.com; dkim=fail; spf=pass (zohomail.com: domain of gnu.org designates 209.51.188.17 as permitted sender) smtp.mailfrom=qemu-devel-bounces+importer=patchew.org@nongnu.org; dmarc=fail(p=none dis=none) header.from=oracle.com ARC-Seal: i=1; a=rsa-sha256; t=1586167328; cv=none; d=zohomail.com; s=zohoarc; b=B9iED9/Bop77bph81S0LzCZzd322oElmkDXdyHTy64yRFIuzd0w+WBkX/2Rw0nWzWFahmBbHwf7tqdJpz/P69hSkpYZAz7h/Xq8RR/LEDgx2sOItd/SpFYnocVqJJEzSn0nSKeYHFrvuzvIeTz9A6hLHvKYhJjA9PWqlHrTSGBo= ARC-Message-Signature: i=1; a=rsa-sha256; c=relaxed/relaxed; d=zohomail.com; s=zohoarc; t=1586167328; h=Content-Type:Content-Transfer-Encoding:Cc:Date:From:In-Reply-To:List-Subscribe:List-Post:List-Id:List-Archive:List-Help:List-Unsubscribe:MIME-Version:Message-ID:References:Sender:Subject:To; bh=bMFeUW+PN4Fh62RHaFNoVJKqmfRyzEgWwQG3Iq3yf8U=; b=NJP5tZkERv4wtbByvuC+3FFSL34XcFqdEFVj/yrQhgPSltqCzgl2D39oaBYp5zPdpMWcPbhf8DyirEnIInHna5/jI8L2mxdr61tErDJAk5lTzJtqc2UsjSfldQWtHWUholJdON62+LvCkEK7+8uhCWZ/6NYoLV1zUkM3u2yWa6o= ARC-Authentication-Results: i=1; mx.zohomail.com; dkim=fail; spf=pass (zohomail.com: domain of gnu.org designates 209.51.188.17 as permitted sender) smtp.mailfrom=qemu-devel-bounces+importer=patchew.org@nongnu.org; dmarc=fail header.from= (p=none dis=none) header.from= Return-Path: Received: from lists.gnu.org (lists.gnu.org [209.51.188.17]) by mx.zohomail.com with SMTPS id 1586167328558600.2197540762145; Mon, 6 Apr 2020 03:02:08 -0700 (PDT) Received: from localhost ([::1]:57774 helo=lists1p.gnu.org) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1jLOZz-00046J-7h for importer@patchew.org; Mon, 06 Apr 2020 06:02:07 -0400 Received: from eggs.gnu.org ([2001:470:142:3::10]:44952) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1jLOIS-0005uQ-IP for qemu-devel@nongnu.org; Mon, 06 Apr 2020 05:44:02 -0400 Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71) (envelope-from ) id 1jLOIQ-0003ix-EJ for qemu-devel@nongnu.org; Mon, 06 Apr 2020 05:44:00 -0400 Received: from userp2120.oracle.com ([156.151.31.85]:46814) by eggs.gnu.org with esmtps (TLS1.0:RSA_AES_256_CBC_SHA1:32) (Exim 4.71) (envelope-from ) id 1jLOIQ-0003iD-53 for qemu-devel@nongnu.org; Mon, 06 Apr 2020 05:43:58 -0400 Received: from pps.filterd (userp2120.oracle.com [127.0.0.1]) by userp2120.oracle.com (8.16.0.42/8.16.0.42) with SMTP id 0369grqm028621; Mon, 6 Apr 2020 09:43:52 GMT Received: from aserp3030.oracle.com (aserp3030.oracle.com [141.146.126.71]) by userp2120.oracle.com with ESMTP id 306jvmwrc4-1 (version=TLSv1.2 cipher=ECDHE-RSA-AES256-GCM-SHA384 bits=256 verify=OK); Mon, 06 Apr 2020 09:43:52 +0000 Received: from pps.filterd (aserp3030.oracle.com [127.0.0.1]) by aserp3030.oracle.com (8.16.0.42/8.16.0.42) with SMTP id 0369cgb9092222; Mon, 6 Apr 2020 09:41:51 GMT Received: from aserv0121.oracle.com (aserv0121.oracle.com [141.146.126.235]) by aserp3030.oracle.com with ESMTP id 3073spk5tp-1 (version=TLSv1.2 cipher=ECDHE-RSA-AES256-GCM-SHA384 bits=256 verify=OK); Mon, 06 Apr 2020 09:41:51 +0000 Received: from abhmp0016.oracle.com (abhmp0016.oracle.com [141.146.116.22]) by aserv0121.oracle.com (8.14.4/8.13.8) with ESMTP id 0369foEq031799; Mon, 6 Apr 2020 09:41:51 GMT Received: from flaka.hsd1.ca.comcast.net (/67.180.143.163) by default (Oracle Beehive Gateway v4.0) with ESMTP ; Mon, 06 Apr 2020 02:41:50 -0700 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=oracle.com; h=from : to : cc : subject : date : message-id : in-reply-to : references : mime-version : content-type : content-transfer-encoding; s=corp-2020-01-29; bh=poyiIix6Qk8vgRZdeHPTb6Q0vO16O4GTcIZpoY0+3tA=; b=RJFydkgBY+Ohr/VbT9SjM8/ZPTRgdbKhJPVAhWqOQ13xhZkXbDwQRCx3fWkbCcYkTPgr AI86t0X5uUuVCPld+y0a5soDm3y3gPcJ6Tqut9vNhq+ljQKM7IfLKSF0UWSdXp7hK8RG KMG6GW6mDMraJNkfGuGB/b+eWZ0x9GL7B8o+XXAMT4GGcqqCtboXGAh/LyfLhV8QALEB LFXDUdYn3KQJ7kYwFKhTS1zVQ+Ev/gtxD8A82JjVsfN/1p5PXKnGXFBo/57JiNrXTxYa YWDOYbY9WbzfZ2ujYrG3LfifivG9IBCjQuj1AAA4Zz/LcjxG/anXKb38ot398nWHQwy6 ZQ== From: elena.ufimtseva@oracle.com To: qemu-devel@nongnu.org Subject: [PATCH v6 11/36] multi-process: define mpqemu-link object Date: Mon, 6 Apr 2020 02:41:01 -0700 Message-Id: <44a31593aa51b50575c659db7906862572b70c13.1586165556.git.elena.ufimtseva@oracle.com> X-Mailer: git-send-email 2.25.GIT In-Reply-To: References: MIME-Version: 1.0 X-Proofpoint-Virus-Version: vendor=nai engine=6000 definitions=9582 signatures=668685 X-Proofpoint-Spam-Details: rule=notspam policy=default score=0 mlxscore=0 phishscore=0 spamscore=0 malwarescore=0 suspectscore=1 adultscore=0 bulkscore=0 mlxlogscore=999 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.12.0-2003020000 definitions=main-2004060083 X-Proofpoint-Virus-Version: vendor=nai engine=6000 definitions=9582 signatures=668685 X-Proofpoint-Spam-Details: rule=notspam policy=default score=0 phishscore=0 suspectscore=1 mlxlogscore=999 mlxscore=0 bulkscore=0 adultscore=0 priorityscore=1501 lowpriorityscore=0 clxscore=1015 malwarescore=0 impostorscore=0 spamscore=0 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.12.0-2003020000 definitions=main-2004060084 Content-Transfer-Encoding: quoted-printable X-MIME-Autoconverted: from 8bit to quoted-printable by userp2120.oracle.com id 0369grqm028621 X-detected-operating-system: by eggs.gnu.org: GNU/Linux 3.x [generic] [fuzzy] X-Received-From: 156.151.31.85 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, liran.alon@oracle.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+importer=patchew.org@nongnu.org Sender: "Qemu-devel" X-ZohoMail-DKIM: fail (Header signature does not verify) Content-Type: text/plain; charset="utf-8" From: Jagannathan Raman Defines mpqemu-link object which forms the communication link between QEMU & emulation program. Adds functions to configure members of mpqemu-link object instance. Adds functions to send and receive messages over the communication channel. Adds GMainLoop to handle events received on the communication channel. Signed-off-by: Jagannathan Raman Signed-off-by: John G Johnson Signed-off-by: Elena Ufimtseva --- MAINTAINERS | 2 + include/io/mpqemu-link.h | 127 ++++++++++++++++ io/Makefile.objs | 2 + io/mpqemu-link.c | 312 +++++++++++++++++++++++++++++++++++++++ 4 files changed, 443 insertions(+) create mode 100644 include/io/mpqemu-link.h create mode 100644 io/mpqemu-link.c diff --git a/MAINTAINERS b/MAINTAINERS index ede5e32953..b895788ba7 100644 --- a/MAINTAINERS +++ b/MAINTAINERS @@ -2817,6 +2817,8 @@ M: John G Johnson S: Maintained F: remote/Makefile.objs F: remote/remote-main.c +F: include/io/mpqemu-link.h +F: io/mpqemu-link.c =20 Build and test automation ------------------------- diff --git a/include/io/mpqemu-link.h b/include/io/mpqemu-link.h new file mode 100644 index 0000000000..af401e640c --- /dev/null +++ b/include/io/mpqemu-link.h @@ -0,0 +1,127 @@ +/* + * Communication channel between QEMU and remote device process + * + * Copyright =C2=A9 2018, 2020 Oracle and/or its affiliates. + * + * This work is licensed under the terms of the GNU GPL, version 2 or late= r. + * See the COPYING file in the top-level directory. + * + */ + +#ifndef MPQEMU_LINK_H +#define MPQEMU_LINK_H + +#include "qemu/osdep.h" +#include "qemu-common.h" + +#include "qom/object.h" +#include "qemu/thread.h" + +#define TYPE_MPQEMU_LINK "mpqemu-link" +#define MPQEMU_LINK(obj) \ + OBJECT_CHECK(MPQemuLinkState, (obj), TYPE_MPQEMU_LINK) + +#define REMOTE_MAX_FDS 8 + +#define MPQEMU_MSG_HDR_SIZE offsetof(MPQemuMsg, data1.u64) + +/** + * mpqemu_cmd_t: + * + * proc_cmd_t enum type to specify the command to be executed on the remote + * device. + */ +typedef enum { + INIT =3D 0, + MAX, +} mpqemu_cmd_t; + +/** + * 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 { + mpqemu_cmd_t cmd; + int bytestream; + size_t size; + + union { + uint64_t u64; + } data1; + + int fds[REMOTE_MAX_FDS]; + int num_fds; + + uint8_t *data2; +} MPQemuMsg; + +/** + * MPQemuChannel: + * @gsrc: GSource object to be used by loop + * @gpfd: GPollFD object containing the socket & events to monitor + * @sock: Socket to send/receive communication, same as the one in gpfd + * @send_lock: Mutex to synchronize access to the send stream + * @recv_lock: Mutex to synchronize access to the recv stream + * + * Defines the channel that make up the communication link + * between QEMU and remote process + */ + +typedef struct MPQemuChannel { + GSource gsrc; + GPollFD gpfd; + int sock; + QemuMutex send_lock; + QemuMutex recv_lock; +} MPQemuChannel; + +typedef struct MPQemuLinkState MPQemuLinkState; + +typedef void (*mpqemu_link_callback)(GIOCondition cond, MPQemuLinkState *l= ink, + MPQemuChannel *chan); + +/* + * MPQemuLinkState Instance info. of the communication + * link between QEMU and remote process. The Link could + * be made up of multiple channels. + * + * ctx GMainContext to be used for communication + * loop Main loop that would be used to poll for incoming data + * com Communication channel to transport control messages + * + */ + +struct MPQemuLinkState { + Object obj; + + GMainContext *ctx; + GMainLoop *loop; + + MPQemuChannel *com; + + mpqemu_link_callback callback; +}; + +MPQemuLinkState *mpqemu_link_create(void); +void mpqemu_link_finalize(MPQemuLinkState *s); + +void mpqemu_msg_send(MPQemuMsg *msg, MPQemuChannel *chan); +int mpqemu_msg_recv(MPQemuMsg *msg, MPQemuChannel *chan); + +void mpqemu_init_channel(MPQemuLinkState *s, MPQemuChannel **chan, int fd); +void mpqemu_destroy_channel(MPQemuChannel *chan); +void mpqemu_link_set_callback(MPQemuLinkState *s, + mpqemu_link_callback callback); +void mpqemu_start_coms(MPQemuLinkState *s, MPQemuChannel* chan); +bool mpqemu_msg_valid(MPQemuMsg *msg); + +#endif diff --git a/io/Makefile.objs b/io/Makefile.objs index 9a20fce4ed..5875ab0697 100644 --- a/io/Makefile.objs +++ b/io/Makefile.objs @@ -10,3 +10,5 @@ io-obj-y +=3D channel-util.o io-obj-y +=3D dns-resolver.o io-obj-y +=3D net-listener.o io-obj-y +=3D task.o + +io-obj-$(CONFIG_MPQEMU) +=3D mpqemu-link.o diff --git a/io/mpqemu-link.c b/io/mpqemu-link.c new file mode 100644 index 0000000000..b7d3e53ae8 --- /dev/null +++ b/io/mpqemu-link.c @@ -0,0 +1,312 @@ +/* + * Communication channel between QEMU and remote device process + * + * Copyright =C2=A9 2018, 2020 Oracle and/or its affiliates. + * + * This work is licensed under the terms of the GNU GPL, version 2 or late= r. + * 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 "qemu/log.h" +#include "qemu/lockable.h" + +GSourceFuncs gsrc_funcs; + +static void mpqemu_link_inst_init(Object *obj) +{ + MPQemuLinkState *s =3D MPQEMU_LINK(obj); + + s->ctx =3D g_main_context_default(); + s->loop =3D g_main_loop_new(s->ctx, FALSE); +} + +static const TypeInfo mpqemu_link_info =3D { + .name =3D TYPE_MPQEMU_LINK, + .parent =3D TYPE_OBJECT, + .instance_size =3D sizeof(MPQemuLinkState), + .instance_init =3D mpqemu_link_inst_init, +}; + +static void mpqemu_link_register_types(void) +{ + type_register_static(&mpqemu_link_info); +} + +type_init(mpqemu_link_register_types) + +MPQemuLinkState *mpqemu_link_create(void) +{ + MPQemuLinkState *link =3D MPQEMU_LINK(object_new(TYPE_MPQEMU_LINK)); + + link->com =3D NULL; + + return link; +} + +void mpqemu_link_finalize(MPQemuLinkState *s) +{ + g_main_loop_unref(s->loop); + g_main_context_unref(s->ctx); + g_main_loop_quit(s->loop); + + mpqemu_destroy_channel(s->com); + + object_unref(OBJECT(s)); +} + +void mpqemu_msg_send(MPQemuMsg *msg, MPQemuChannel *chan) +{ + int rc; + uint8_t *data; + union { + char control[CMSG_SPACE(REMOTE_MAX_FDS * sizeof(int))]; + struct cmsghdr align; + } u; + struct msghdr hdr; + struct cmsghdr *chdr; + int sock =3D chan->sock; + QemuMutex *lock =3D &chan->send_lock; + + struct iovec iov =3D { + .iov_base =3D (char *) msg, + .iov_len =3D MPQEMU_MSG_HDR_SIZE, + }; + + memset(&hdr, 0, sizeof(hdr)); + memset(&u, 0, sizeof(u)); + + hdr.msg_iov =3D &iov; + hdr.msg_iovlen =3D 1; + + if (msg->num_fds > REMOTE_MAX_FDS) { + qemu_log_mask(LOG_REMOTE_DEBUG, "%s: Max FDs exceeded\n", __func__= ); + return; + } + + if (msg->num_fds > 0) { + size_t fdsize =3D msg->num_fds * sizeof(int); + + hdr.msg_control =3D &u; + hdr.msg_controllen =3D sizeof(u); + + chdr =3D CMSG_FIRSTHDR(&hdr); + chdr->cmsg_len =3D CMSG_LEN(fdsize); + chdr->cmsg_level =3D SOL_SOCKET; + chdr->cmsg_type =3D SCM_RIGHTS; + memcpy(CMSG_DATA(chdr), msg->fds, fdsize); + hdr.msg_controllen =3D CMSG_SPACE(fdsize); + } + + WITH_QEMU_LOCK_GUARD(lock) { + do { + rc =3D sendmsg(sock, &hdr, 0); + } while (rc < 0 && (errno =3D=3D EINTR || errno =3D=3D EAGAIN)); + + if (rc < 0) { + qemu_log_mask(LOG_REMOTE_DEBUG, "%s - sendmsg rc is %d, errno = is %d," + " sock %d\n", __func__, rc, errno, sock); + return; + } + + if (msg->bytestream) { + data =3D msg->data2; + } else { + data =3D (uint8_t *)msg + MPQEMU_MSG_HDR_SIZE; + } + + do { + rc =3D write(sock, data, msg->size); + } while (rc < 0 && (errno =3D=3D EINTR || errno =3D=3D EAGAIN)); + } +} + + +int mpqemu_msg_recv(MPQemuMsg *msg, MPQemuChannel *chan) +{ + int rc; + uint8_t *data; + union { + char control[CMSG_SPACE(REMOTE_MAX_FDS * sizeof(int))]; + struct cmsghdr align; + } u; + struct msghdr hdr; + struct cmsghdr *chdr; + size_t fdsize; + int sock =3D chan->sock; + QemuMutex *lock =3D &chan->recv_lock; + + struct iovec iov =3D { + .iov_base =3D (char *) msg, + .iov_len =3D MPQEMU_MSG_HDR_SIZE, + }; + + memset(&hdr, 0, sizeof(hdr)); + memset(&u, 0, sizeof(u)); + + hdr.msg_iov =3D &iov; + hdr.msg_iovlen =3D 1; + hdr.msg_control =3D &u; + hdr.msg_controllen =3D sizeof(u); + + WITH_QEMU_LOCK_GUARD(lock) { + do { + rc =3D recvmsg(sock, &hdr, 0); + } while (rc < 0 && (errno =3D=3D EINTR || errno =3D=3D EAGAIN)); + + if (rc < 0) { + qemu_log_mask(LOG_REMOTE_DEBUG, "%s - recvmsg rc is %d, errno = is %d," + " sock %d\n", __func__, rc, errno, sock); + return rc; + } + + msg->num_fds =3D 0; + for (chdr =3D CMSG_FIRSTHDR(&hdr); chdr !=3D NULL; + chdr =3D CMSG_NXTHDR(&hdr, chdr)) { + if ((chdr->cmsg_level =3D=3D SOL_SOCKET) && + (chdr->cmsg_type =3D=3D SCM_RIGHTS)) { + fdsize =3D chdr->cmsg_len - CMSG_LEN(0); + msg->num_fds =3D fdsize / sizeof(int); + if (msg->num_fds > REMOTE_MAX_FDS) { + qemu_log_mask(LOG_REMOTE_DEBUG, + "%s: Max FDs exceeded\n", __func__); + return -ERANGE; + } + + memcpy(msg->fds, CMSG_DATA(chdr), fdsize); + break; + } + } + + if (msg->bytestream) { + if (!msg->size) { + qemu_mutex_unlock(lock); + return -EINVAL; + } + + msg->data2 =3D calloc(1, msg->size); + data =3D msg->data2; + } else { + data =3D (uint8_t *)&msg->data1; + } + + if (msg->size) { + do { + rc =3D read(sock, data, msg->size); + } while (rc < 0 && (errno =3D=3D EINTR || errno =3D=3D EAGAIN)= ); + } + } + return rc; +} + +static gboolean mpqemu_link_handler_prepare(GSource *gsrc, gint *timeout) +{ + g_assert(timeout); + + *timeout =3D -1; + + return FALSE; +} + +static gboolean mpqemu_link_handler_check(GSource *gsrc) +{ + MPQemuChannel *chan =3D (MPQemuChannel *)gsrc; + + return chan->gpfd.events & chan->gpfd.revents; +} + +static gboolean mpqemu_link_handler_dispatch(GSource *gsrc, GSourceFunc fu= nc, + gpointer data) +{ + MPQemuLinkState *s =3D (MPQemuLinkState *)data; + MPQemuChannel *chan =3D (MPQemuChannel *)gsrc; + + s->callback(chan->gpfd.revents, s, chan); + + if ((chan->gpfd.revents & G_IO_HUP) || (chan->gpfd.revents & G_IO_ERR)= ) { + return G_SOURCE_REMOVE; + } + + return G_SOURCE_CONTINUE; +} + +void mpqemu_link_set_callback(MPQemuLinkState *s, mpqemu_link_callback cal= lback) +{ + s->callback =3D callback; +} + +void mpqemu_init_channel(MPQemuLinkState *s, MPQemuChannel **chan, int fd) +{ + MPQemuChannel *src; + + gsrc_funcs =3D (GSourceFuncs){ + .prepare =3D mpqemu_link_handler_prepare, + .check =3D mpqemu_link_handler_check, + .dispatch =3D mpqemu_link_handler_dispatch, + .finalize =3D NULL, + }; + + src =3D (MPQemuChannel *)g_source_new(&gsrc_funcs, sizeof(MPQemuChanne= l)); + + src->sock =3D fd; + qemu_mutex_init(&src->send_lock); + qemu_mutex_init(&src->recv_lock); + + g_source_set_callback(&src->gsrc, NULL, (gpointer)s, NULL); + src->gpfd.fd =3D fd; + src->gpfd.events =3D G_IO_IN | G_IO_HUP | G_IO_ERR; + g_source_add_poll(&src->gsrc, &src->gpfd); + + *chan =3D src; +} + +void mpqemu_destroy_channel(MPQemuChannel *chan) +{ + g_source_unref(&chan->gsrc); + close(chan->sock); + qemu_mutex_destroy(&chan->send_lock); + qemu_mutex_destroy(&chan->recv_lock); +} + +void mpqemu_start_coms(MPQemuLinkState *s, MPQemuChannel* chan) +{ + g_assert(g_source_attach(&chan->gsrc, s->ctx)); + + g_main_loop_run(s->loop); +} + +bool mpqemu_msg_valid(MPQemuMsg *msg) +{ + if (msg->cmd >=3D MAX) { + return false; + } + + if (msg->bytestream) { + if (!msg->data2) { + return false; + } + } else { + if (msg->data2) { + return false; + } + } + + /* Verify FDs. */ + if (msg->num_fds >=3D REMOTE_MAX_FDS) { + return false; + } + if (msg->num_fds > 0) { + for (int i =3D 0; i < msg->num_fds; i++) { + if (fcntl(msg->fds[i], F_GETFL) =3D=3D -1) { + return false; + } + } + } + + return true; +} --=20 2.25.GIT