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Fri, 31 Jul 2020 18:21:02 +0000 Received: from abhmp0005.oracle.com (abhmp0005.oracle.com [141.146.116.11]) by aserv0122.oracle.com (8.14.4/8.14.4) with ESMTP id 06VIL11w023774; Fri, 31 Jul 2020 18:21:01 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 11:21:01 -0700 From: Jagannathan Raman To: qemu-devel@nongnu.org Subject: [PATCH v8 17/20] multi-process: heartbeat messages to remote Date: Fri, 31 Jul 2020 14:20:24 -0400 Message-Id: <93b7566e5d565b9e5d8127849bb5be65057e25cc.1596217462.git.jag.raman@oracle.com> X-Mailer: git-send-email 1.8.3.1 In-Reply-To: References: In-Reply-To: References: 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 adultscore=0 clxscore=1015 malwarescore=0 spamscore=0 suspectscore=3 bulkscore=0 priorityscore=1501 phishscore=0 mlxlogscore=999 lowpriorityscore=0 impostorscore=0 mlxscore=0 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.12.0-2006250000 definitions=main-2007310137 Received-SPF: pass client-ip=156.151.31.86; envelope-from=jag.raman@oracle.com; helo=userp2130.oracle.com X-detected-operating-system: by eggs.gnu.org: First seen = 2020/07/31 12:51:59 X-ACL-Warn: Detected OS = Linux 3.1-3.10 [fuzzy] X-Spam_score_int: -63 X-Spam_score: -6.4 X-Spam_bar: ------ X-Spam_report: (-6.4 / 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_H2=-1, 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+patchwork-qemu-devel=patchwork.kernel.org@nongnu.org Sender: "Qemu-devel" From: Elena Ufimtseva In order to detect remote processes which are hung, the proxy periodically sends heartbeat messages to confirm if the remote process is alive. The remote process responds to this heartbeat message to confirm it is alive. Signed-off-by: Jagannathan Raman Signed-off-by: John G Johnson Signed-off-by: Elena Ufimtseva --- hw/i386/remote-msg.c | 19 ++++++++++++++++++ hw/pci/proxy.c | 52 ++++++++++++++++++++++++++++++++++++++++++++++++ include/hw/pci/proxy.h | 2 ++ include/io/mpqemu-link.h | 1 + io/mpqemu-link.c | 8 ++++++++ 5 files changed, 82 insertions(+) diff --git a/hw/i386/remote-msg.c b/hw/i386/remote-msg.c index 756b710..2a4d7f1 100644 --- a/hw/i386/remote-msg.c +++ b/hw/i386/remote-msg.c @@ -26,6 +26,7 @@ static void process_config_read(QIOChannel *ioc, PCIDevice *dev, MPQemuMsg *msg); static void process_bar_write(QIOChannel *ioc, MPQemuMsg *msg, Error **errp); static void process_bar_read(QIOChannel *ioc, MPQemuMsg *msg, Error **errp); +static void process_proxy_ping_msg(QIOChannel *ioc, Error **errp); gboolean mpqemu_process_msg(QIOChannel *ioc, GIOCondition cond, gpointer opaque) @@ -75,6 +76,9 @@ gboolean mpqemu_process_msg(QIOChannel *ioc, GIOCondition cond, case SET_IRQFD: process_set_irqfd_msg(pci_dev, &msg); break; + case PROXY_PING: + process_proxy_ping_msg(ioc, &local_err); + break; default: error_setg(&local_err, "Unknown command (%d) received for device %s (pid=%d)", @@ -223,3 +227,18 @@ fail: "in remote process pid=%d", getpid()); } } + +static void process_proxy_ping_msg(QIOChannel *ioc, Error **errp) +{ + MPQemuMsg ret = { 0 }; + Error *local_err = NULL; + + ret.cmd = RET_MSG; + ret.size = sizeof(ret.data1); + + mpqemu_msg_send(&ret, ioc, &local_err); + if (local_err) { + error_setg(errp, "Error while sending message to proxy " + "in remote process pid=%d", getpid()); + } +} diff --git a/hw/pci/proxy.c b/hw/pci/proxy.c index 50a806c..490093c 100644 --- a/hw/pci/proxy.c +++ b/hw/pci/proxy.c @@ -24,6 +24,8 @@ #include "util/event_notifier-posix.c" static void probe_pci_info(PCIDevice *dev, Error **errp); +static void start_hb_timer(PCIProxyDev *dev); +static void stop_hb_timer(PCIProxyDev *dev); static void proxy_set_socket(PCIProxyDev *pdev, int fd, Error **errp) { @@ -111,6 +113,8 @@ static void pci_proxy_dev_realize(PCIDevice *device, Error **errp) setup_irqfd(dev); probe_pci_info(PCI_DEVICE(dev), errp); + + start_hb_timer(dev); } static void pci_proxy_dev_exit(PCIDevice *pdev) @@ -123,6 +127,8 @@ static void pci_proxy_dev_exit(PCIDevice *pdev) event_notifier_cleanup(&dev->intr); event_notifier_cleanup(&dev->resample); + + stop_hb_timer(dev); } static int config_op_send(PCIProxyDev *pdev, uint32_t addr, uint32_t *val, @@ -343,3 +349,49 @@ static void probe_pci_info(PCIDevice *dev, Error **errp) } } } + +static void hb_msg(PCIProxyDev *dev) +{ + DeviceState *ds = DEVICE(dev); + Error *local_err = NULL; + MPQemuMsg msg = { 0 }; + + msg.cmd = PROXY_PING; + msg.bytestream = 0; + msg.size = 0; + + (void)mpqemu_msg_send_and_await_reply(&msg, dev->ioc, &local_err); + if (local_err) { + error_report_err(local_err); + qio_channel_close(dev->ioc, &local_err); + error_setg(&error_fatal, "Lost contact with device %s", ds->id); + } +} + +#define NOP_INTERVAL 1000 + +static void remote_ping(void *opaque) +{ + PCIProxyDev *dev = opaque; + + hb_msg(dev); + + timer_mod(dev->hb_timer, + qemu_clock_get_ms(QEMU_CLOCK_VIRTUAL) + NOP_INTERVAL); +} + +static void start_hb_timer(PCIProxyDev *dev) +{ + dev->hb_timer = timer_new_ms(QEMU_CLOCK_VIRTUAL, + remote_ping, + dev); + + timer_mod(dev->hb_timer, + qemu_clock_get_ms(QEMU_CLOCK_VIRTUAL) + NOP_INTERVAL); +} + +static void stop_hb_timer(PCIProxyDev *dev) +{ + timer_del(dev->hb_timer); + timer_free(dev->hb_timer); +} diff --git a/include/hw/pci/proxy.h b/include/hw/pci/proxy.h index 15cc381..d784328 100644 --- a/include/hw/pci/proxy.h +++ b/include/hw/pci/proxy.h @@ -40,6 +40,8 @@ struct PCIProxyDev { EventNotifier intr; EventNotifier resample; + QEMUTimer *hb_timer; + ProxyMemoryRegion region[PCI_NUM_REGIONS]; }; diff --git a/include/io/mpqemu-link.h b/include/io/mpqemu-link.h index a3844e1..5f2913f 100644 --- a/include/io/mpqemu-link.h +++ b/include/io/mpqemu-link.h @@ -40,6 +40,7 @@ typedef enum { BAR_READ, SET_IRQFD, GET_PCI_INFO, + PROXY_PING, MAX = INT_MAX, } MPQemuCmd; diff --git a/io/mpqemu-link.c b/io/mpqemu-link.c index 6fa4665..0222e81 100644 --- a/io/mpqemu-link.c +++ b/io/mpqemu-link.c @@ -280,6 +280,14 @@ bool mpqemu_msg_valid(MPQemuMsg *msg) return false; } break; + case PROXY_PING: + if (msg->bytestream || msg->num_fds) { + return false; + } + if (msg->size) { + return false; + } + break; default: break; }