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[libvirt] [PATCH v2 00/27] Prepare for specific vcpu hot(un)plug - part 1
by Peter Krempa 09 Dec '15

09 Dec '15

This series is getting rather big. The target is to refactor the way libvirt stores info about vCPUs into a single structure (okay, two structures for the qemu driver. Part 1 is not yet completely there, well, not even halfway. Future work will involve fully allocating priv->vcpupids to the maxcpus size and moving around few other bits of data in cputune and other parts to the new structure. Yet another follow up work is then to add new APIs for vCPU hotplug, which will enable adding vCPUs sparsely (useful if you have NUMA). Since this refactor will result in tracking all vcpu-related data in one struct, the result will automagically fix a few bugs where we'd end up with invalid config after vcpu unplug or other operations. Version 2 does not contain already pushed patches and incorporates feedback from John's review. Since I've changed quite a few things I'm reposting this. Peter Krempa (27): conf: Replace writes to def->maxvcpus with accessor conf: Use local copy of maxvcpus in virDomainVcpuParse conf: Extract update of vcpu count if maxvcpus is decreased conf: Add helper to check whether domain has offline vCPUs conf: Replace read access to def->maxvcpus with accessor conf: Replace writes to def->vcpus with accessor conf: Move vcpu count check into helper conf: Replace read accesses to def->vcpus with accessor conf: Turn def->maxvcpus into size_t qemu: domain: Add helper to access vm->privateData->agent qemu: Extract vCPU onlining/offlining via agent into a separate function qemu: qemuDomainSetVcpusAgent: re-check agent before calling it the again qemu: Split up vCPU hotplug and hotunplug qemu: cpu hotplug: Fix error handling logic qemu: monitor: Remove weird return values from qemuMonitorSetCPU qemu: cpu hotplug: Move loops to qemuDomainSetVcpusFlags qemu: Refactor qemuDomainHotplugVcpus qemu: refactor qemuDomainHotunplugVcpus conf: turn def->vcpus into a structure conf: ABI: Split up and improve vcpu info ABI checking conf: Add helper to get pointer to a certain vCPU definition qemu: cgroup: Remove now unreachable check qemu: Drop checking vcpu threads in emulator bandwidth getter/setter qemu: Replace checking for vcpu<->pid mapping availability with a helper qemu: Add helper to retrieve vCPU pid qemu: driver: Refactor qemuDomainHelperGetVcpus qemu: cgroup: Don't use priv->ncpupids to iterate domain vCPUs src/bhyve/bhyve_command.c | 2 +- src/bhyve/bhyve_driver.c | 2 +- src/conf/domain_audit.c | 2 +- src/conf/domain_conf.c | 190 ++++++++++++--- src/conf/domain_conf.h | 20 +- src/hyperv/hyperv_driver.c | 10 +- src/libvirt_private.syms | 6 + src/libxl/libxl_conf.c | 6 +- src/libxl/libxl_driver.c | 40 ++-- src/lxc/lxc_controller.c | 2 +- src/lxc/lxc_driver.c | 2 +- src/lxc/lxc_native.c | 7 +- src/openvz/openvz_conf.c | 7 +- src/openvz/openvz_driver.c | 19 +- src/phyp/phyp_driver.c | 12 +- src/qemu/qemu_cgroup.c | 42 ++-- src/qemu/qemu_command.c | 29 ++- src/qemu/qemu_domain.c | 47 ++++ src/qemu/qemu_domain.h | 4 + src/qemu/qemu_driver.c | 542 ++++++++++++++++++++++--------------------- src/qemu/qemu_monitor.c | 3 + src/qemu/qemu_monitor_json.c | 8 - src/qemu/qemu_monitor_text.c | 23 +- src/qemu/qemu_process.c | 22 +- src/test/test_driver.c | 38 +-- src/uml/uml_driver.c | 2 +- src/vbox/vbox_common.c | 19 +- src/vmware/vmware_driver.c | 2 +- src/vmx/vmx.c | 38 +-- src/vz/vz_driver.c | 8 +- src/vz/vz_sdk.c | 13 +- src/xen/xm_internal.c | 19 +- src/xenapi/xenapi_driver.c | 7 +- src/xenapi/xenapi_utils.c | 6 +- src/xenconfig/xen_common.c | 16 +- src/xenconfig/xen_sxpr.c | 27 ++- 36 files changed, 767 insertions(+), 475 deletions(-) -- 2.6.2

1 28

[libvirt] Handling large amount of VF's with intelligent passthrough
by Jan Gutter 09 Dec '15

09 Dec '15

Hi, I've run into a rather interesting problem recently where a weird interaction between libnl3 and libvirt caused some difficult-to-debug issues. From libvirt's side, the issue was that a netlink response was much larger than the pagesize and truncated by libnl3. When virNetDevLinkDump() calls virNetlinkCommand(), nl_recv() is supposed to return a rather large structure with information for all the Virtual Functions. When called in a system where the number of PCIe Virtual Functions are more than 30 for a given Physical Function, the netlink response is larger than 4k, meaning that a message is truncated. Unfortunately libnl3 truncates this silently, meaning that a cryptic error pops up much later in virNetDevParseVfConfig(), "missing IFLA_VF_INFO in netlink response". Aside from the error propagation (which might be fixable in libnl3), there still remains the need to enable libvirt to function in cases like this. This can be done in two ways, both in virNetlinkCommand(). 1. Message peeking can be enabled. In theory this slows down any netlink messages by doing a two stage query: query the buffer size, then allocate the receive buffer and receive the message. This is a reliability/performance tradeoff, I guess. This is as simple as adding: nl_socket_enable_msg_peek(nlhandle); 2. The receive buffer size can also be made larger: nl_socket_set_msg_buf_size(nlhandle, ARBITRARY_BUFFER_SIZE); This does not incur a performance penalty, but until libnl3 can propagate the truncation error, this merely postpones the error for future generations... Jan

3 5

[libvirt] [PATCH v3 0/6] Add read error ignore to storage backend vol info APIs
by John Ferlan 09 Dec '15

09 Dec '15

v2 here: http://www.redhat.com/archives/libvir-list/2015-November/thread.html Based on review and well just the amount of change I figured I'd generate a v3. The patches were mostly ACK'd, but patch 3 required removal of some flags which resulted in patch 1 needing updates... Then I found that what I'd done in patch 3 regarding returning errors needed to generate a patch 2.5... So I just bit the bullet and am posting the patches again. Patches 2, 4, and 5 of this series are unchanged. While patch 1 removes 'readflags' from an API, patch 3 is new, and patch 6 uses the new name. John Ferlan (6): storage: Add readflags for backend error processing storage: Add comments for backend APIs storage: Set ret = -1 on failures in virStorageBackendUpdateVolTargetInfo storage: Handle readflags errors storage: Add debug message storage: Ignore block devices that fail format detection src/storage/storage_backend.c | 83 ++++++++++++++++++++++++++++++----- src/storage/storage_backend.h | 15 ++++++- src/storage/storage_backend_disk.c | 5 ++- src/storage/storage_backend_fs.c | 4 +- src/storage/storage_backend_logical.c | 2 +- src/storage/storage_backend_mpath.c | 2 +- src/storage/storage_backend_scsi.c | 6 ++- 7 files changed, 96 insertions(+), 21 deletions(-) -- 2.5.0

2 7

[libvirt] [PATCH v2] guest-agent-socket: don't generate default path to config XML
by Pavel Hrdina 09 Dec '15

09 Dec '15

While we started using for all unix sockets as default one common directory based on a guest name it introduced several issues, for example with renaming the guest or cloning it. In general it's not entirely bad, but in this case it would be best to hide the auto-generated socket path from user and don't export it in the config XML. Signed-off-by: Pavel Hrdina <phrdina(a)redhat.com> --- Version 2: - removed unnecessary changes src/qemu/qemu_command.c | 28 ++++++++++++++++++++++++++++ src/qemu/qemu_command.h | 1 + src/qemu/qemu_domain.c | 16 ---------------- src/qemu/qemu_driver.c | 3 +++ src/qemu/qemu_process.c | 3 +++ tests/qemuhotplugtest.c | 5 +++++ tests/qemuxml2argvtest.c | 5 +++++ 7 files changed, 45 insertions(+), 16 deletions(-) diff --git a/src/qemu/qemu_command.c b/src/qemu/qemu_command.c index 2a9fab5..f1bb621 100644 --- a/src/qemu/qemu_command.c +++ b/src/qemu/qemu_command.c @@ -1262,6 +1262,34 @@ qemuAssignDeviceAliases(virDomainDefPtr def, virQEMUCapsPtr qemuCaps) } +int +qemuUnixSocketGenerate(virDomainDefPtr def, + virQEMUDriverConfigPtr cfg) +{ + size_t i; + + for (i = 0; i < def->nchannels; i++) { + virDomainChrDefPtr channel = def->channels[i]; + + if (channel->deviceType == VIR_DOMAIN_CHR_DEVICE_TYPE_CHANNEL && + channel->targetType == VIR_DOMAIN_CHR_CHANNEL_TARGET_TYPE_VIRTIO && + channel->source.type == VIR_DOMAIN_CHR_TYPE_UNIX && + !channel->source.data.nix.path) { + if (virAsprintf(&channel->source.data.nix.path, + "%s/domain-%s/%s", + cfg->channelTargetDir, def->name, + channel->target.name ? channel->target.name + : "unknown.sock") < 0) + return -1; + + channel->source.data.nix.listen = true; + } + } + + return 0; +} + + static void qemuDomainPrimeVirtioDeviceAddresses(virDomainDefPtr def, virDomainDeviceAddressType type) diff --git a/src/qemu/qemu_command.h b/src/qemu/qemu_command.h index bebdd27..0512a23 100644 --- a/src/qemu/qemu_command.h +++ b/src/qemu/qemu_command.h @@ -283,6 +283,7 @@ int qemuAssignDevicePCISlots(virDomainDefPtr def, virDomainPCIAddressSetPtr addrs); int qemuAssignDeviceAliases(virDomainDefPtr def, virQEMUCapsPtr qemuCaps); +int qemuUnixSocketGenerate(virDomainDefPtr def, virQEMUDriverConfigPtr cfg); int qemuDomainNetVLAN(virDomainNetDefPtr def); int qemuAssignDeviceNetAlias(virDomainDefPtr def, virDomainNetDefPtr net, int idx); int qemuAssignDeviceDiskAlias(virDomainDefPtr vmdef, diff --git a/src/qemu/qemu_domain.c b/src/qemu/qemu_domain.c index ed21245..7e05289 100644 --- a/src/qemu/qemu_domain.c +++ b/src/qemu/qemu_domain.c @@ -1329,22 +1329,6 @@ qemuDomainDeviceDefPostParse(virDomainDeviceDefPtr dev, ARCH_IS_S390(def->os.arch)) dev->data.controller->model = VIR_DOMAIN_CONTROLLER_MODEL_SCSI_VIRTIO_SCSI; - /* auto generate unix socket path */ - if (dev->type == VIR_DOMAIN_DEVICE_CHR && - dev->data.chr->deviceType == VIR_DOMAIN_CHR_DEVICE_TYPE_CHANNEL && - dev->data.chr->targetType == VIR_DOMAIN_CHR_CHANNEL_TARGET_TYPE_VIRTIO && - dev->data.chr->source.type == VIR_DOMAIN_CHR_TYPE_UNIX && - !dev->data.chr->source.data.nix.path) { - if (virAsprintf(&dev->data.chr->source.data.nix.path, - "%s/domain-%s/%s", - cfg->channelTargetDir, def->name, - dev->data.chr->target.name ? dev->data.chr->target.name - : "unknown.sock") < 0) - goto cleanup; - - dev->data.chr->source.data.nix.listen = true; - } - /* forbid capabilities mode hostdev in this kind of hypervisor */ if (dev->type == VIR_DOMAIN_DEVICE_HOSTDEV && dev->data.hostdev->mode == VIR_DOMAIN_HOSTDEV_MODE_CAPABILITIES) { diff --git a/src/qemu/qemu_driver.c b/src/qemu/qemu_driver.c index ae1d8e7..39f2f03 100644 --- a/src/qemu/qemu_driver.c +++ b/src/qemu/qemu_driver.c @@ -7254,6 +7254,9 @@ static char *qemuConnectDomainXMLToNative(virConnectPtr conn, if (qemuAssignDeviceAliases(def, qemuCaps) < 0) goto cleanup; + if (qemuUnixSocketGenerate(def, cfg) < 0) + goto cleanup; + if (qemuDomainAssignAddresses(def, qemuCaps, NULL) < 0) goto cleanup; diff --git a/src/qemu/qemu_process.c b/src/qemu/qemu_process.c index 192730c..29cf965 100644 --- a/src/qemu/qemu_process.c +++ b/src/qemu/qemu_process.c @@ -4663,6 +4663,9 @@ qemuProcessLaunch(virConnectPtr conn, if (qemuAssignDeviceAliases(vm->def, priv->qemuCaps) < 0) goto cleanup; + if (qemuUnixSocketGenerate(vm->def, cfg) < 0) + goto cleanup; + /* Get the advisory nodeset from numad if 'placement' of * either <vcpu> or <numatune> is 'auto'. */ diff --git a/tests/qemuhotplugtest.c b/tests/qemuhotplugtest.c index 102e052..b17cca2 100644 --- a/tests/qemuhotplugtest.c +++ b/tests/qemuhotplugtest.c @@ -61,6 +61,7 @@ qemuHotplugCreateObjects(virDomainXMLOptionPtr xmlopt, { int ret = -1; qemuDomainObjPrivatePtr priv = NULL; + virQEMUDriverConfigPtr cfg = virQEMUDriverGetConfig(&driver); if (!(*vm = virDomainObjNew(xmlopt))) goto cleanup; @@ -94,10 +95,14 @@ qemuHotplugCreateObjects(virDomainXMLOptionPtr xmlopt, if (qemuAssignDeviceAliases((*vm)->def, priv->qemuCaps) < 0) goto cleanup; + if (qemuUnixSocketGenerate((*vm)->def, cfg) < 0) + goto cleanup; + (*vm)->def->id = QEMU_HOTPLUG_TEST_DOMAIN_ID; ret = 0; cleanup: + virObjectUnref(cfg); return ret; } diff --git a/tests/qemuxml2argvtest.c b/tests/qemuxml2argvtest.c index f7596a0..f6083db 100644 --- a/tests/qemuxml2argvtest.c +++ b/tests/qemuxml2argvtest.c @@ -262,6 +262,7 @@ static int testCompareXMLToArgvFiles(const char *xml, virCommandPtr cmd = NULL; size_t i; virBitmapPtr nodeset = NULL; + virQEMUDriverConfigPtr cfg = virQEMUDriverGetConfig(&driver); if (!(conn = virGetConnect())) goto out; @@ -324,6 +325,9 @@ static int testCompareXMLToArgvFiles(const char *xml, if (qemuAssignDeviceAliases(vmdef, extraFlags) < 0) goto out; + if (qemuUnixSocketGenerate(vmdef, cfg) < 0) + goto out; + for (i = 0; i < vmdef->nhostdevs; i++) { virDomainHostdevDefPtr hostdev = vmdef->hostdevs[i]; @@ -387,6 +391,7 @@ static int testCompareXMLToArgvFiles(const char *xml, virCommandFree(cmd); virDomainDefFree(vmdef); virObjectUnref(conn); + virObjectUnref(cfg); virBitmapFree(nodeset); return ret; } -- 2.6.3

2 1

[libvirt] somtimes libvirtd crashed when fail to start a guest, need help to debug
by Luyao Huang 09 Dec '15

09 Dec '15

Dear list, I met a problem when test with the latest libvirt (build from current master branch), i found sometimes libvirtd crashed when guest fail to start. the reproduce way is very easy, but hard to meet: # cat /root/shdo2.sh #！/bin/sh while : do virsh start rhel7.0-rhel done # sh /root/shdo2.sh ... error: Failed to start domain rhel7.0-rhel error: internal error: process exited while connecting to monitor: 2015-12-09T06:58:37.785695Z qemu-kvm: -chardev socket,id=charchannel1,path=/var/lib/libvirt/qemu1/rhel7.0-rhel.agent,server,nowait: Failed to bind socket to /var/lib/libvirt/qemu1/rhel7.0-rhel.agent: No such file or directory error: Failed to start domain rhel7.0-rhel error: internal error: process exited while connecting to monitor: 2015-12-09T06:58:42.035103Z qemu-kvm: -chardev socket,id=charchannel1,path=/var/lib/libvirt/qemu1/rhel7.0-rhel.agent,server,nowait: Failed to bind socket to /var/lib/libvirt/qemu1/rhel7.0-rhel.agent: No such file or directory error: Disconnected from qemu:///system due to I/O error error: Failed to start domain rhel7.0-rhel error: End of file while reading data: Input/output error error: One or more references were leaked after disconnect from the hypervisor error: failed to connect to the hypervisor error: no valid connection error: Failed to connect socket to '/var/run/libvirt/libvirt-sock': Connection refused and here is the bt full output: http://pastebin.com/sCYHByvP and here is the valgrind output: http://pastebin.com/0VXrYTKT I cannot found what happened, also i am not familiar with virtlogd. could someone please help to debug this ? Thanks, Luyao

1 0

[libvirt] [PATCH v2] log: include hostname in initial log message
by Daniel P. Berrange 08 Dec '15

08 Dec '15

On the very first log message we send to any output, we include the libvirt version number and package string. In some bug reports we have been given libvirtd.log files that came from a different host than the corresponding /var/log/libvirt/qemu log files. So extend the initial log message to include the hostname too. eg on first log message we would now see: $ libvirtd 2015-12-04 17:35:36.610+0000: 20917: info : libvirt version: 1.3.0 2015-12-04 17:35:36.610+0000: 20917: info : hostname: dhcp-1-180.lcy.redhat.com 2015-12-04 17:35:36.610+0000: 20917: error : qemuMonitorIO:687 : internal error: End of file from monitor Signed-off-by: Daniel P. Berrange <berrange(a)redhat.com> --- src/libvirt_private.syms | 1 + src/util/virlog.c | 72 ++++++++++++++++++++++++++++++++++++------------ src/util/virutil.c | 34 ++++++++++++++++------- src/util/virutil.h | 1 + 4 files changed, 81 insertions(+), 27 deletions(-) diff --git a/src/libvirt_private.syms b/src/libvirt_private.syms index dd085c3..f483c4c 100644 --- a/src/libvirt_private.syms +++ b/src/libvirt_private.syms @@ -2387,6 +2387,7 @@ virGetGroupID; virGetGroupList; virGetGroupName; virGetHostname; +virGetHostnameQuiet; virGetListenFDs; virGetSCSIHostNameByParentaddr; virGetSCSIHostNumber; diff --git a/src/util/virlog.c b/src/util/virlog.c index 627f4cb..7d5a266 100644 --- a/src/util/virlog.c +++ b/src/util/virlog.c @@ -94,7 +94,7 @@ static int virLogNbFilters; * after filtering, multiple output can be used simultaneously */ struct _virLogOutput { - bool logVersion; + bool logInitMessage; void *data; virLogOutputFunc f; virLogCloseFunc c; @@ -402,7 +402,7 @@ virLogDefineOutput(virLogOutputFunc f, goto cleanup; } ret = virLogNbOutputs++; - virLogOutputs[ret].logVersion = true; + virLogOutputs[ret].logInitMessage = true; virLogOutputs[ret].f = f; virLogOutputs[ret].c = c; virLogOutputs[ret].data = data; @@ -452,6 +452,32 @@ virLogVersionString(const char **rawmsg, return virLogFormatString(msg, 0, NULL, VIR_LOG_INFO, VIR_LOG_VERSION_STRING); } +/* Similar to virGetHostname() but avoids use of error + * reporting APIs or logging APIs, to prevent recursion + */ +static int +virLogHostnameString(const char **rawmsg, + char **msg) +{ + char *hostname = virGetHostnameQuiet(); + char *hoststr; + + if (!hostname) + return -1; + + if (virAsprintfQuiet(&hoststr, "hostname: %s", hostname) < 0) { + VIR_FREE(hostname); + return -1; + } + + if (virLogFormatString(msg, 0, NULL, VIR_LOG_INFO, hoststr) < 0) { + VIR_FREE(hoststr); + return -1; + } + *rawmsg = hoststr; + return 0; +} + static void virLogSourceUpdate(virLogSourcePtr source) @@ -533,7 +559,7 @@ virLogVMessage(virLogSourcePtr source, const char *fmt, va_list vargs) { - static bool logVersionStderr = true; + static bool logInitMessageStderr = true; char *str = NULL; char *msg = NULL; char timestamp[VIR_TIME_STRING_BUFLEN]; @@ -583,16 +609,22 @@ virLogVMessage(virLogSourcePtr source, */ for (i = 0; i < virLogNbOutputs; i++) { if (priority >= virLogOutputs[i].priority) { - if (virLogOutputs[i].logVersion) { - const char *rawver; - char *ver = NULL; - if (virLogVersionString(&rawver, &ver) >= 0) + if (virLogOutputs[i].logInitMessage) { + const char *rawinitmsg; + char *initmsg = NULL; + if (virLogVersionString(&rawinitmsg, &initmsg) >= 0) + virLogOutputs[i].f(&virLogSelf, VIR_LOG_INFO, + __FILE__, __LINE__, __func__, + timestamp, NULL, 0, rawinitmsg, initmsg, + virLogOutputs[i].data); + VIR_FREE(initmsg); + if (virLogHostnameString(&rawinitmsg, &initmsg) >= 0) virLogOutputs[i].f(&virLogSelf, VIR_LOG_INFO, __FILE__, __LINE__, __func__, - timestamp, NULL, 0, rawver, ver, + timestamp, NULL, 0, rawinitmsg, initmsg, virLogOutputs[i].data); - VIR_FREE(ver); - virLogOutputs[i].logVersion = false; + VIR_FREE(initmsg); + virLogOutputs[i].logInitMessage = false; } virLogOutputs[i].f(source, priority, filename, linenr, funcname, @@ -601,16 +633,22 @@ virLogVMessage(virLogSourcePtr source, } } if (virLogNbOutputs == 0) { - if (logVersionStderr) { - const char *rawver; - char *ver = NULL; - if (virLogVersionString(&rawver, &ver) >= 0) + if (logInitMessageStderr) { + const char *rawinitmsg; + char *initmsg = NULL; + if (virLogVersionString(&rawinitmsg, &initmsg) >= 0) + virLogOutputToFd(&virLogSelf, VIR_LOG_INFO, + __FILE__, __LINE__, __func__, + timestamp, NULL, 0, rawinitmsg, initmsg, + (void *) STDERR_FILENO); + VIR_FREE(initmsg); + if (virLogHostnameString(&rawinitmsg, &initmsg) >= 0) virLogOutputToFd(&virLogSelf, VIR_LOG_INFO, __FILE__, __LINE__, __func__, - timestamp, NULL, 0, rawver, ver, + timestamp, NULL, 0, rawinitmsg, initmsg, (void *) STDERR_FILENO); - VIR_FREE(ver); - logVersionStderr = false; + VIR_FREE(initmsg); + logInitMessageStderr = false; } virLogOutputToFd(source, priority, filename, linenr, funcname, diff --git a/src/util/virutil.c b/src/util/virutil.c index fe65faf..e83def1 100644 --- a/src/util/virutil.c +++ b/src/util/virutil.c @@ -662,16 +662,17 @@ char *virIndexToDiskName(int idx, const char *prefix) * we got from getaddrinfo(). Return the value from gethostname() * and hope for the best. */ -char *virGetHostname(void) +static char *virGetHostnameImpl(bool quiet) { int r; - char hostname[HOST_NAME_MAX+1], *result; + char hostname[HOST_NAME_MAX+1], *result = NULL; struct addrinfo hints, *info; r = gethostname(hostname, sizeof(hostname)); if (r == -1) { - virReportSystemError(errno, - "%s", _("failed to determine host name")); + if (!quiet) + virReportSystemError(errno, + "%s", _("failed to determine host name")); return NULL; } NUL_TERMINATE(hostname); @@ -683,7 +684,7 @@ char *virGetHostname(void) * string as-is; it's up to callers to check whether "localhost" * is allowed. */ - ignore_value(VIR_STRDUP(result, hostname)); + ignore_value(VIR_STRDUP_QUIET(result, hostname)); goto cleanup; } @@ -696,9 +697,10 @@ char *virGetHostname(void) hints.ai_family = AF_UNSPEC; r = getaddrinfo(hostname, NULL, &hints, &info); if (r != 0) { - VIR_WARN("getaddrinfo failed for '%s': %s", - hostname, gai_strerror(r)); - ignore_value(VIR_STRDUP(result, hostname)); + if (!quiet) + VIR_WARN("getaddrinfo failed for '%s': %s", + hostname, gai_strerror(r)); + ignore_value(VIR_STRDUP_QUIET(result, hostname)); goto cleanup; } @@ -711,17 +713,29 @@ char *virGetHostname(void) * localhost. Ignore the canonicalized name and just return the * original hostname */ - ignore_value(VIR_STRDUP(result, hostname)); + ignore_value(VIR_STRDUP_QUIET(result, hostname)); else /* Caller frees this string. */ - ignore_value(VIR_STRDUP(result, info->ai_canonname)); + ignore_value(VIR_STRDUP_QUIET(result, info->ai_canonname)); freeaddrinfo(info); cleanup: + if (!result) { + virReportOOMError(); + } return result; } +char *virGetHostname(void) +{ + return virGetHostnameImpl(false); +} + +char *virGetHostnameQuiet(void) +{ + return virGetHostnameImpl(true); +} char * virGetUserDirectory(void) diff --git a/src/util/virutil.h b/src/util/virutil.h index 02387e0..535807c 100644 --- a/src/util/virutil.h +++ b/src/util/virutil.h @@ -132,6 +132,7 @@ static inline int pthread_sigmask(int how, # endif char *virGetHostname(void); +char *virGetHostnameQuiet(void); char *virGetUserDirectory(void); char *virGetUserDirectoryByUID(uid_t uid); -- 2.5.0

2 1

[libvirt] Event after reverting to snapshot
by Dmitry Andreev 08 Dec '15

08 Dec '15

Hi, I'm looking for a way to catch an event about reverting to snapshot. As I can see in the code there is no lifecycle event if VM state wasn't changed. The comment in the code of qemuDomainRevertToSnapshot: /* We have the following transitions, which create the following events: * 1. inactive -> inactive: none * 2. inactive -> running: EVENT_STARTED * 3. inactive -> paused: EVENT_STARTED, EVENT_PAUSED * 4. running -> inactive: EVENT_STOPPED * 5. running -> running: none * 6. running -> paused: EVENT_PAUSED * 7. paused -> inactive: EVENT_STOPPED * 8. paused -> running: EVENT_RESUMED * 9. paused -> paused: none * Also, several transitions occur even if we fail partway through, * and use of FORCE can cause multiple transitions. */ Also there is no VIR_DOMAIN_EVENT_DEFINED event after reverting to snapshot, even when domain configuration is changed. Isn't that strange? Checked on stopped VM. Is there any way to catch event about changes in configuration after reverting to snapshot.

2 1

[libvirt] [PATCH 0/6] Add multiqueue support for macvtaps
by Michal Privoznik 08 Dec '15

08 Dec '15

Some patches are easier to review when showed with --ignore-space-change. Michal Privoznik (6): virNetDevMacVLanCreateWithVPortProfile: Turn vnet_hdr into flag virNetDevMacVLanTapOpen: Slightly rework virNetDevMacVLanTapOpen: Rework to support multiple FDs virNetDevMacVLanTapSetup: Rework to support multiple FDs virNetDevMacVLanCreateWithVPortProfile: Rework to support multiple FDs qemu: Enable multiqueue for macvtaps src/lxc/lxc_process.c | 3 +- src/qemu/qemu_command.c | 61 +++++++++------- src/qemu/qemu_command.h | 2 + src/qemu/qemu_hotplug.c | 16 +++-- src/util/virnetdevmacvlan.c | 171 ++++++++++++++++++++++++-------------------- src/util/virnetdevmacvlan.h | 13 ++-- 6 files changed, 150 insertions(+), 116 deletions(-) -- 2.4.10

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[libvirt] [PATCH] rpm: explicitly enable & start virlockd/virtlogd sockets on install
by Daniel P. Berrange 08 Dec '15

08 Dec '15

When installing the libvirt-daemon RPM, we have a %post rule to enable the libvirtd.service, virtlockd.socket and virtlogd.socket files. This is only done, however, when the RPM is first installed, not when upgrading RPMs. This adds a separate rule to explicitly enable the virtlockd.socket and virtlogd.socket units upon RPM upgrade, if libvirtd.service is marked as enabled. It also adds a rule to start the socket units if libvirtd.service is running. The downside with taking this approach is that it is impossible for a user to have libvirtd.service enabled and disable socket activation, because we'll re-enable it on every upgrade. Similarly we'll be starting the socket listeners on every upgrade if libvirtd is running. This is a pretty nasty thing to have to keep in libvirt for the long term, given this upgrade problem is a one-time only pain point. For this reason I am recommending *NOT* applying this patch to GIT. Instead, I think we just have to release note the fact that after upgrading you should enable the virtlockd.socket unit. --- libvirt.spec.in | 12 ++++++++++++ 1 file changed, 12 insertions(+) diff --git a/libvirt.spec.in b/libvirt.spec.in index 1f76f24..48e5632 100644 --- a/libvirt.spec.in +++ b/libvirt.spec.in @@ -1703,6 +1703,18 @@ if [ $1 -eq 1 ] ; then libvirtd.service >/dev/null 2>&1 || : fi %endif + +# In upgrade scenario we must explicitly enable virtlockd/virtlogd +# sockets, if libvirtd is already enabled and start them if +# libvirtd is running, otherwise you'll get failures to start +# guests +if [ $1 -ge 1 ] ; then + /bin/systemctl is-enabled libvirtd.service 1>/dev/null 2>&1 && + /bin/systemctl enable virtlockd.socket virtlogd.socket + /bin/systemctl is-active libvirtd.service 1>/dev/null 2>&1 && + /bin/systemctl start virtlockd.socket virtlogd.socket +fi + %else %if %{with_cgconfig} # Starting with Fedora 16/RHEL-7, systemd automounts all cgroups, -- 2.5.0

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[libvirt] Sparse image volDownload
by Michal Privoznik 08 Dec '15

08 Dec '15

Dear list, I'd like to hear your opinion on the following bug: https://bugzilla.redhat.com/show_bug.cgi?id=1282859 Long story short, Imagine the following scenario: 1. Create 4GB file full of zeroes 2. virsh vol-download it What happens is that all those 4GB are transferred byte after byte through our RPC system. Not only this puts needles pressure on our event loop, it's suboptimal for network and other resources too. I'd like to explore our options here keeping in mind that the original volume might have been sparse and we ought to keep it sparse on the destination too. In the bug the reporter (Matthew Booth) suggests introducing new type of RPC message that will let us keep our APIs unchanged. The source will scan the file for windows of zeroes bigger than some value. When found the new type of message is passed to client without need to copy those zeroes. Yes, this is very similar to RLE. If we are going that way, should we enable users to put a compression program in between read()/write() and our RPC? Well, should we let users to choose what compression program we will put there? Because there are better compression algorithms than RLE. Michal

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