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[libvirt] [libvirt-tck PATCH] 121-block-info.t: omit network
by Guido Günther 29 May '13

29 May '13

qemu:///session doesn't have a default network so we fail with: ./scripts/domain/121-block-info.t .. 1/29 # Defining transient storage pool # Generic guest with pervious created vol ./scripts/domain/121-block-info.t .. 12/29 # Failed test 'Create domain' # at /var/lib/jenkins/jobs/libvirt-tck-build/workspace/lib//Sys/Virt/TCK.pm line 803. # expected Sys::Virt::Domain object # found 'libvirt error code: 43, message: Network not found: no network with matching name 'default' # ' The network isn't needed so simply leave it out. --- scripts/domain/121-block-info.t | 1 - 1 file changed, 1 deletion(-) diff --git a/scripts/domain/121-block-info.t b/scripts/domain/121-block-info.t index a25d075..dad00c6 100644 --- a/scripts/domain/121-block-info.t +++ b/scripts/domain/121-block-info.t @@ -91,7 +91,6 @@ $guest->rmdisk(); $guest->disk(format => { name => "qemu", type => $disktype }, type => "file", src => $path, dst => $dst); $guest->disk(format => { name => "qemu", type => $disktype }, type => "file", src=> $path2, dst => $dst2); $guest->disk(format => { name => "qemu", type => "qcow2" }, type => "file", src=> $path3, dst => $dst3); -$guest->interface(type => "network", source => "default", model => "virtio", mac => "52:54:00:22:22:22"); $xml = $guest->as_xml; my $dom; -- 1.7.10.4

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[libvirt] snapshot-create-as Permission denied
by yue 28 May '13

28 May '13

May 25 20:50:59 ovirtdev NetworkManager[2370]: <warn> /sys/devices/virtual/net/vnet0: couldn't determine device driver; ignoring... root@ovirtdev images]# virsh snapshot-create-as linux snapshot1 "snapshot1" --disk-only --atomic error: internal error unable to execute QEMU command 'transaction': /var/lib/libvirt/images/test.snapshot1: error while creating qcow2: Permission denied

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[libvirt] [libvirt-tck PATCH] 121-block-info.t: allow for greater capacity/allocation
by Guido Günther 28 May '13

28 May '13

Don't be too picky about the actual size and allocation. The size needs to be correct but it's o.k. for allocation and size to be bigger. Debian Wheezy's qemu adds 4096 bytes. --- scripts/domain/121-block-info.t | 8 ++++---- 1 file changed, 4 insertions(+), 4 deletions(-) diff --git a/scripts/domain/121-block-info.t b/scripts/domain/121-block-info.t index dad00c6..4c3fafc 100644 --- a/scripts/domain/121-block-info.t +++ b/scripts/domain/121-block-info.t @@ -103,8 +103,8 @@ is($dom->get_block_info($dst2,0)->{physical}, 1024*1024, "Get disk physical info is($dom->get_block_info($dst,0)->{capacity}, 1024*1024*50, "Get disk capacity info"); -is($dom->get_block_info($dst,0)->{allocation}, 1024*1024*50, "Get disk allocation info"); -is($dom->get_block_info($dst,0)->{physical}, 1024*1024*50, "Get disk physical info"); +ok($dom->get_block_info($dst,0)->{allocation} >= 1024*1024*50, "Get disk allocation info"); +ok($dom->get_block_info($dst,0)->{physical} >= 1024*1024*50, "Get disk physical info"); diag "Test block_resize"; lives_ok(sub {$dom->block_resize($dst, 512*50)}, "resize to 512*50 KB"); @@ -112,8 +112,8 @@ $st = stat($path); is($st->size, 512*1024*50, "size is 25M"); is($dom->get_block_info($dst,0)->{capacity}, 1024*512*50, "Get disk capacity info"); -is($dom->get_block_info($dst,0)->{allocation}, 1024*512*50, "Get disk allocation info"); -is($dom->get_block_info($dst,0)->{physical}, 1024*512*50, "Get disk physical info"); +ok($dom->get_block_info($dst,0)->{allocation} >= 1024*512*50, "Get disk allocation info"); +ok($dom->get_block_info($dst,0)->{physical} >= 1024*512*50, "Get disk physical info"); lives_ok(sub {$dom->block_resize($dst, 1024*50)}, "resize to 1024*50 KB"); $st = stat($path); -- 1.7.10.4

2 1

[libvirt] [PATCH] util/vshstring: fix the vir_strdup when src is NULL.
by yangdongsheng 28 May '13

28 May '13

When src is NULL, vir_strdup will return 0 directly. This patch will set dest to NULL before vir_strdup return. Signed-off-by: yangdongsheng <yangds.fnst(a)cn.fujitsu.com> --- src/util/virstring.c | 4 +++- 1 file changed, 3 insertions(+), 1 deletion(-) diff --git a/src/util/virstring.c b/src/util/virstring.c index b244e6c..25b5d81 100644 --- a/src/util/virstring.c +++ b/src/util/virstring.c @@ -540,8 +540,10 @@ virStrdup(char **dest, const char *funcname, size_t linenr) { - if (!src) + if (!src) { + *dest = NULL; return 0; + } if (!(*dest = strdup(src))) { if (report) virReportOOMErrorFull(domcode, filename, funcname, linenr); -- 1.7.10.1

3 2

[libvirt] [PATCH 0/2] don't masquerade local broadcast/multicast packets
by Laszlo Ersek 28 May '13

28 May '13

Masquerading local broadcast breaks DHCP replies for some clients. There has been a report about broken local multicast too. (See references in the patches.) Testing: since I have no idea how to test upstream libvirt on a RHEL-6.4.z virt host and guarantee nothing will be tangled up, I ported the series to libvirt-0.10.2-18.el6_4.5 and tested that. (The upstream series does build and passes the checks in HACKING, except I didn't try valgrind.) Laszlo Ersek (2): util/viriptables: add/remove rules that short-circuit masquerading bridge driver: don't masquerade local subnet broadcast/multicast packets src/util/viriptables.h | 10 +++++ src/network/bridge_driver.c | 76 +++++++++++++++++++++++++++++++++-- src/util/viriptables.c | 93 +++++++++++++++++++++++++++++++++++++++++++ src/libvirt_private.syms | 2 + 4 files changed, 177 insertions(+), 4 deletions(-)

2 3

[libvirt] [PATCH v3 0/3] libvirt supports Guest panicked
by Chen Fan 28 May '13

28 May '13

This patchs implement the 'on_crash' behavior in the XML example XML: <on_crash>destroy</on_crash> Changes: v2-v3: 1. split into 3 patches v1-v2: 1. fix the incorrect domain state: paused -> crashed, when crash the guest while libvirt isn't running, then restart libvirtd. Chen Fan (3): libvirt: Define domain crash event types qemu: Supports guest panicked virsh: supports guest panicked examples/domain-events/events-c/event-test.c | 10 +++ include/libvirt/libvirt.h.in | 16 +++++ src/conf/domain_conf.c | 12 ++-- src/qemu/qemu_monitor.c | 14 +++- src/qemu/qemu_monitor.h | 5 ++ src/qemu/qemu_monitor_json.c | 7 ++ src/qemu/qemu_process.c | 103 ++++++++++++++++++++++++++- tools/virsh-domain-monitor.c | 8 +++ 8 files changed, 169 insertions(+), 6 deletions(-) -- 1.8.1.4

2 4

[libvirt] [PATCH v2] libvirt supports Guest Panicked
by Chen Fan 28 May '13

28 May '13

From: ChenFan <chen.fan.fnst(a)cn.fujitsu.com> This patch implements qemu_driver supporting guest panicked. we crashed the guest while libvirt isn't running, then restart libvirtd, we change the domain state to 'crashed'. --- examples/domain-events/events-c/event-test.c | 10 +++ include/libvirt/libvirt.h.in | 16 +++++ src/conf/domain_conf.c | 12 ++-- src/qemu/qemu_monitor.c | 14 +++- src/qemu/qemu_monitor.h | 5 ++ src/qemu/qemu_monitor_json.c | 7 ++ src/qemu/qemu_process.c | 103 ++++++++++++++++++++++++++- tools/virsh-domain-monitor.c | 8 +++ 8 files changed, 169 insertions(+), 6 deletions(-) diff --git a/examples/domain-events/events-c/event-test.c b/examples/domain-events/events-c/event-test.c index eeff50f..1b425fb 100644 --- a/examples/domain-events/events-c/event-test.c +++ b/examples/domain-events/events-c/event-test.c @@ -93,6 +93,9 @@ const char *eventToString(int event) { case VIR_DOMAIN_EVENT_PMSUSPENDED: ret = "PMSuspended"; break; + case VIR_DOMAIN_EVENT_CRASHED: + ret = "Crashed"; + break; } return ret; } @@ -209,6 +212,13 @@ static const char *eventDetailToString(int event, int detail) { break; } break; + case VIR_DOMAIN_EVENT_CRASHED: + switch ((virDomainEventCrashedDetailType) detail) { + case VIR_DOMAIN_EVENT_CRASHED_PANICKED: + ret = "Panicked"; + break; + } + break; } return ret; } diff --git a/include/libvirt/libvirt.h.in b/include/libvirt/libvirt.h.in index 1804c93..56c6c5c 100644 --- a/include/libvirt/libvirt.h.in +++ b/include/libvirt/libvirt.h.in @@ -155,6 +155,7 @@ typedef enum { VIR_DOMAIN_RUNNING_SAVE_CANCELED = 7, /* returned from failed save process */ VIR_DOMAIN_RUNNING_WAKEUP = 8, /* returned from pmsuspended due to wakeup event */ + VIR_DOMAIN_RUNNING_CRASHED = 9, /* resumed from crashed */ #ifdef VIR_ENUM_SENTINELS VIR_DOMAIN_RUNNING_LAST @@ -180,6 +181,7 @@ typedef enum { VIR_DOMAIN_PAUSED_FROM_SNAPSHOT = 7, /* paused after restoring from snapshot */ VIR_DOMAIN_PAUSED_SHUTTING_DOWN = 8, /* paused during shutdown process */ VIR_DOMAIN_PAUSED_SNAPSHOT = 9, /* paused while creating a snapshot */ + VIR_DOMAIN_PAUSED_GUEST_PANICKED = 10, /* paused due to a guest panicked event */ #ifdef VIR_ENUM_SENTINELS VIR_DOMAIN_PAUSED_LAST @@ -189,6 +191,7 @@ typedef enum { typedef enum { VIR_DOMAIN_SHUTDOWN_UNKNOWN = 0, /* the reason is unknown */ VIR_DOMAIN_SHUTDOWN_USER = 1, /* shutting down on user request */ + VIR_DOMAIN_SHUTDOWN_CRASHED = 2, /* domain crashed */ #ifdef VIR_ENUM_SENTINELS VIR_DOMAIN_SHUTDOWN_LAST @@ -212,6 +215,7 @@ typedef enum { typedef enum { VIR_DOMAIN_CRASHED_UNKNOWN = 0, /* crashed for unknown reason */ + VIR_DOMAIN_CRASHED_PANICKED = 1, /* domain panicked */ #ifdef VIR_ENUM_SENTINELS VIR_DOMAIN_CRASHED_LAST @@ -3319,6 +3323,7 @@ typedef enum { VIR_DOMAIN_EVENT_STOPPED = 5, VIR_DOMAIN_EVENT_SHUTDOWN = 6, VIR_DOMAIN_EVENT_PMSUSPENDED = 7, + VIR_DOMAIN_EVENT_CRASHED = 8, #ifdef VIR_ENUM_SENTINELS VIR_DOMAIN_EVENT_LAST @@ -3450,6 +3455,17 @@ typedef enum { #endif } virDomainEventPMSuspendedDetailType; +/* + * Details about the 'crashed' lifecycle event + */ +typedef enum { + VIR_DOMAIN_EVENT_CRASHED_PANICKED = 0, /* Guest was panicked */ + +#ifdef VIR_ENUM_SENTINELS + VIR_DOMAIN_EVENT_CRASHED_LAST +#endif +} virDomainEventCrashedDetailType; + /** * virConnectDomainEventCallback: * @conn: virConnect connection diff --git a/src/conf/domain_conf.c b/src/conf/domain_conf.c index a9656af..f577fd4 100644 --- a/src/conf/domain_conf.c +++ b/src/conf/domain_conf.c @@ -642,7 +642,8 @@ VIR_ENUM_IMPL(virDomainRunningReason, VIR_DOMAIN_RUNNING_LAST, "unpaused", "migration canceled", "save canceled", - "wakeup") + "wakeup", + "from crashed") VIR_ENUM_IMPL(virDomainBlockedReason, VIR_DOMAIN_BLOCKED_LAST, "unknown") @@ -657,11 +658,13 @@ VIR_ENUM_IMPL(virDomainPausedReason, VIR_DOMAIN_PAUSED_LAST, "watchdog", "from snapshot", "shutdown", - "snapshot") + "snapshot", + "guest panicked") VIR_ENUM_IMPL(virDomainShutdownReason, VIR_DOMAIN_SHUTDOWN_LAST, "unknown", - "user") + "user", + "crashed") VIR_ENUM_IMPL(virDomainShutoffReason, VIR_DOMAIN_SHUTOFF_LAST, "unknown", @@ -674,7 +677,8 @@ VIR_ENUM_IMPL(virDomainShutoffReason, VIR_DOMAIN_SHUTOFF_LAST, "from snapshot") VIR_ENUM_IMPL(virDomainCrashedReason, VIR_DOMAIN_CRASHED_LAST, - "unknown") + "unknown", + "panicked") VIR_ENUM_IMPL(virDomainPMSuspendedReason, VIR_DOMAIN_PMSUSPENDED_LAST, "unknown") diff --git a/src/qemu/qemu_monitor.c b/src/qemu/qemu_monitor.c index 4e35f79..e0cd62c 100644 --- a/src/qemu/qemu_monitor.c +++ b/src/qemu/qemu_monitor.c @@ -113,7 +113,7 @@ VIR_ENUM_IMPL(qemuMonitorVMStatus, QEMU_MONITOR_VM_STATUS_LAST, "debug", "inmigrate", "internal-error", "io-error", "paused", "postmigrate", "prelaunch", "finish-migrate", "restore-vm", - "running", "save-vm", "shutdown", "watchdog") + "running", "save-vm", "shutdown", "watchdog", "guest-panicked") typedef enum { QEMU_MONITOR_BLOCK_IO_STATUS_OK, @@ -1032,6 +1032,15 @@ int qemuMonitorEmitResume(qemuMonitorPtr mon) } +int qemuMonitorEmitGUESTPanicked(qemuMonitorPtr mon) +{ + int ret = -1; + VIR_DEBUG("mon=%p", mon); + QEMU_MONITOR_CALLBACK(mon, ret, domainGUESTPanicked, mon->vm); + return ret; +} + + int qemuMonitorEmitRTCChange(qemuMonitorPtr mon, long long offset) { int ret = -1; @@ -3185,6 +3194,9 @@ int qemuMonitorVMStatusToPausedReason(const char *status) case QEMU_MONITOR_VM_STATUS_WATCHDOG: return VIR_DOMAIN_PAUSED_WATCHDOG; + case QEMU_MONITOR_VM_STATUS_GUEST_PANICKED: + return VIR_DOMAIN_PAUSED_GUEST_PANICKED; + /* unreachable from this point on */ case QEMU_MONITOR_VM_STATUS_LAST: ; diff --git a/src/qemu/qemu_monitor.h b/src/qemu/qemu_monitor.h index a607712..543050c 100644 --- a/src/qemu/qemu_monitor.h +++ b/src/qemu/qemu_monitor.h @@ -140,6 +140,8 @@ struct _qemuMonitorCallbacks { unsigned long long actual); int (*domainPMSuspendDisk)(qemuMonitorPtr mon, virDomainObjPtr vm); + int (*domainGUESTPanicked)(qemuMonitorPtr mon, + virDomainObjPtr vm); }; char *qemuMonitorEscapeArg(const char *in); @@ -220,6 +222,8 @@ int qemuMonitorEmitBlockJob(qemuMonitorPtr mon, int qemuMonitorEmitBalloonChange(qemuMonitorPtr mon, unsigned long long actual); int qemuMonitorEmitPMSuspendDisk(qemuMonitorPtr mon); +int qemuMonitorEmitGUESTPanicked(qemuMonitorPtr mon); + int qemuMonitorStartCPUs(qemuMonitorPtr mon, virConnectPtr conn); @@ -239,6 +243,7 @@ typedef enum { QEMU_MONITOR_VM_STATUS_SAVE_VM, QEMU_MONITOR_VM_STATUS_SHUTDOWN, QEMU_MONITOR_VM_STATUS_WATCHDOG, + QEMU_MONITOR_VM_STATUS_GUEST_PANICKED, QEMU_MONITOR_VM_STATUS_LAST } qemuMonitorVMStatus; diff --git a/src/qemu/qemu_monitor_json.c b/src/qemu/qemu_monitor_json.c index 2b73884..b6efa52 100644 --- a/src/qemu/qemu_monitor_json.c +++ b/src/qemu/qemu_monitor_json.c @@ -74,6 +74,7 @@ static void qemuMonitorJSONHandleBlockJobCanceled(qemuMonitorPtr mon, virJSONVal static void qemuMonitorJSONHandleBlockJobReady(qemuMonitorPtr mon, virJSONValuePtr data); static void qemuMonitorJSONHandleBalloonChange(qemuMonitorPtr mon, virJSONValuePtr data); static void qemuMonitorJSONHandlePMSuspendDisk(qemuMonitorPtr mon, virJSONValuePtr data); +static void qemuMonitorJSONHandleGUESTPanicked(qemuMonitorPtr mon, virJSONValuePtr data); typedef struct { const char *type; @@ -87,6 +88,7 @@ static qemuEventHandler eventHandlers[] = { { "BLOCK_JOB_COMPLETED", qemuMonitorJSONHandleBlockJobCompleted, }, { "BLOCK_JOB_READY", qemuMonitorJSONHandleBlockJobReady, }, { "DEVICE_TRAY_MOVED", qemuMonitorJSONHandleTrayChange, }, + { "GUEST_PANICKED", qemuMonitorJSONHandleGUESTPanicked, }, { "POWERDOWN", qemuMonitorJSONHandlePowerdown, }, { "RESET", qemuMonitorJSONHandleReset, }, { "RESUME", qemuMonitorJSONHandleResume, }, @@ -593,6 +595,11 @@ static void qemuMonitorJSONHandleResume(qemuMonitorPtr mon, virJSONValuePtr data qemuMonitorEmitResume(mon); } +static void qemuMonitorJSONHandleGUESTPanicked(qemuMonitorPtr mon, virJSONValuePtr data ATTRIBUTE_UNUSED) +{ + qemuMonitorEmitGUESTPanicked(mon); +} + static void qemuMonitorJSONHandleRTCChange(qemuMonitorPtr mon, virJSONValuePtr data) { long long offset = 0; diff --git a/src/qemu/qemu_process.c b/src/qemu/qemu_process.c index d4fd4fb..29c8c4b 100644 --- a/src/qemu/qemu_process.c +++ b/src/qemu/qemu_process.c @@ -548,6 +548,7 @@ qemuProcessFakeReboot(void *opaque) qemuDomainObjPrivatePtr priv = vm->privateData; virDomainEventPtr event = NULL; virQEMUDriverConfigPtr cfg = virQEMUDriverGetConfig(driver); + virDomainRunningReason reason = VIR_DOMAIN_RUNNING_BOOTED; int ret = -1; VIR_DEBUG("vm=%p", vm); virObjectLock(vm); @@ -573,8 +574,11 @@ qemuProcessFakeReboot(void *opaque) goto endjob; } + if (virDomainObjGetState(vm, NULL) == VIR_DOMAIN_CRASHED) + reason = VIR_DOMAIN_RUNNING_CRASHED; + if (qemuProcessStartCPUs(driver, vm, NULL, - VIR_DOMAIN_RUNNING_BOOTED, + reason, QEMU_ASYNC_JOB_NONE) < 0) { if (virGetLastError() == NULL) virReportError(VIR_ERR_INTERNAL_ERROR, @@ -1269,6 +1273,98 @@ qemuProcessHandlePMSuspendDisk(qemuMonitorPtr mon ATTRIBUTE_UNUSED, return 0; } +static int +qemuProcessHandleGUESTPanicked(qemuMonitorPtr mon ATTRIBUTE_UNUSED, + virDomainObjPtr vm) +{ + virQEMUDriverPtr driver = qemu_driver; + qemuDomainObjPrivatePtr priv; + virDomainEventPtr event = NULL; + bool isReboot = true; + virQEMUDriverConfigPtr cfg = virQEMUDriverGetConfig(driver); + + VIR_DEBUG("vm=%p", vm); + + virObjectLock(vm); + + if (!virDomainObjIsActive(vm)) { + VIR_DEBUG("Ignoring GUEST_PANICKED event from inactive domain %s", + vm->def->name); + goto cleanup; + } + + priv = vm->privateData; + + virDomainObjSetState(vm, + VIR_DOMAIN_CRASHED, + VIR_DOMAIN_CRASHED_PANICKED); + + event = virDomainEventNewFromObj(vm, + VIR_DOMAIN_EVENT_CRASHED, + VIR_DOMAIN_EVENT_CRASHED_PANICKED); + + if (vm->def->onCrash == VIR_DOMAIN_LIFECYCLE_CRASH_PRESERVE) { + VIR_FREE(priv->lockState); + + if (virDomainLockProcessPause(driver->lockManager, vm, &priv->lockState) < 0) + VIR_WARN("Unable to release lease on %s", vm->def->name); + VIR_DEBUG("Preserving lock state '%s'", NULLSTR(priv->lockState)); + + if (virDomainSaveStatus(driver->xmlopt, cfg->stateDir, vm) < 0) { + VIR_WARN("Unable to save status on vm %s after state change", + vm->def->name); + } + + goto cleanup; + } + + if (vm->def->onCrash == VIR_DOMAIN_LIFECYCLE_CRASH_DESTROY) { + isReboot = false; + VIR_INFO("Domain on_crash setting overridden, shutting down"); + } + + qemuDomainSetFakeReboot(driver, vm, isReboot); + + if (isReboot) { + qemuProcessShutdownOrReboot(driver, vm); + } else { + priv->beingDestroyed = true; + + if (qemuProcessKill(vm, VIR_QEMU_PROCESS_KILL_FORCE) < 0) { + priv->beingDestroyed = false; + goto cleanup; + } + + priv->beingDestroyed = false; + + if (! virDomainObjIsActive(vm)) { + virReportError(VIR_ERR_OPERATION_INVALID, + "%s", _("domain is not running")); + goto cleanup; + } + + qemuProcessStop(driver, vm, VIR_DOMAIN_SHUTOFF_CRASHED, 0); + event = virDomainEventNewFromObj(vm, + VIR_DOMAIN_EVENT_STOPPED, + VIR_DOMAIN_EVENT_STOPPED_CRASHED); + + virDomainAuditStop(vm, "destroyed"); + + if (! vm->persistent) { + qemuDomainRemoveInactive(driver, vm); + vm = NULL; + } + } + +cleanup: + if (vm) + virObjectUnlock(vm); + if (event) + qemuDomainEventQueue(driver, event); + virObjectUnref(cfg); + + return 0; +} static qemuMonitorCallbacks monitorCallbacks = { .destroy = qemuProcessHandleMonitorDestroy, @@ -1289,6 +1385,7 @@ static qemuMonitorCallbacks monitorCallbacks = { .domainPMSuspend = qemuProcessHandlePMSuspend, .domainBalloonChange = qemuProcessHandleBalloonChange, .domainPMSuspendDisk = qemuProcessHandlePMSuspendDisk, + .domainGUESTPanicked = qemuProcessHandleGUESTPanicked, }; static int @@ -2673,6 +2770,10 @@ qemuProcessUpdateState(virQEMUDriverPtr driver, virDomainObjPtr vm) newState = VIR_DOMAIN_SHUTDOWN; newReason = VIR_DOMAIN_SHUTDOWN_UNKNOWN; ignore_value(VIR_STRDUP_QUIET(msg, "shutdown")); + } else if (reason == VIR_DOMAIN_PAUSED_GUEST_PANICKED) { + newState = VIR_DOMAIN_CRASHED; + newReason = VIR_DOMAIN_CRASHED_PANICKED; + ignore_value(VIR_STRDUP_QUIET(msg, "was crashed")); } else { newState = VIR_DOMAIN_PAUSED; newReason = reason; diff --git a/tools/virsh-domain-monitor.c b/tools/virsh-domain-monitor.c index 5ed89d1..4bddefe 100644 --- a/tools/virsh-domain-monitor.c +++ b/tools/virsh-domain-monitor.c @@ -192,6 +192,8 @@ vshDomainStateReasonToString(int state, int reason) return N_("save canceled"); case VIR_DOMAIN_RUNNING_WAKEUP: return N_("event wakeup"); + case VIR_DOMAIN_RUNNING_CRASHED: + return N_("from crashed"); case VIR_DOMAIN_RUNNING_UNKNOWN: case VIR_DOMAIN_RUNNING_LAST: ; @@ -226,6 +228,8 @@ vshDomainStateReasonToString(int state, int reason) return N_("shutting down"); case VIR_DOMAIN_PAUSED_SNAPSHOT: return N_("creating snapshot"); + case VIR_DOMAIN_PAUSED_GUEST_PANICKED: + return N_("guest panicked"); case VIR_DOMAIN_PAUSED_UNKNOWN: case VIR_DOMAIN_PAUSED_LAST: ; @@ -236,6 +240,8 @@ vshDomainStateReasonToString(int state, int reason) switch ((virDomainShutdownReason) reason) { case VIR_DOMAIN_SHUTDOWN_USER: return N_("user"); + case VIR_DOMAIN_SHUTDOWN_CRASHED: + return N_("crashed"); case VIR_DOMAIN_SHUTDOWN_UNKNOWN: case VIR_DOMAIN_SHUTDOWN_LAST: ; @@ -266,6 +272,8 @@ vshDomainStateReasonToString(int state, int reason) case VIR_DOMAIN_CRASHED: switch ((virDomainCrashedReason) reason) { + case VIR_DOMAIN_CRASHED_PANICKED: + return N_("panicked"); case VIR_DOMAIN_CRASHED_UNKNOWN: case VIR_DOMAIN_CRASHED_LAST: ; -- 1.8.1.4

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[libvirt] [PATCH] libvirt supports Guest Panicked
by Chen Fan 28 May '13

28 May '13

From: chenfan <chen.fan.fnst(a)cn.fujitsu.com> This patch implements qemu_driver supporting guest panicked, modified the 'on_crash' default value to 'preserve'. --- examples/domain-events/events-c/event-test.c | 10 +++ include/libvirt/libvirt.h.in | 16 +++++ src/conf/domain_conf.c | 14 ++-- src/qemu/qemu_monitor.c | 14 +++- src/qemu/qemu_monitor.h | 5 ++ src/qemu/qemu_monitor_json.c | 7 ++ src/qemu/qemu_process.c | 99 +++++++++++++++++++++++++++- tools/virsh-domain-monitor.c | 8 +++ 8 files changed, 166 insertions(+), 7 deletions(-) diff --git a/examples/domain-events/events-c/event-test.c b/examples/domain-events/events-c/event-test.c index eeff50f..1b425fb 100644 --- a/examples/domain-events/events-c/event-test.c +++ b/examples/domain-events/events-c/event-test.c @@ -93,6 +93,9 @@ const char *eventToString(int event) { case VIR_DOMAIN_EVENT_PMSUSPENDED: ret = "PMSuspended"; break; + case VIR_DOMAIN_EVENT_CRASHED: + ret = "Crashed"; + break; } return ret; } @@ -209,6 +212,13 @@ static const char *eventDetailToString(int event, int detail) { break; } break; + case VIR_DOMAIN_EVENT_CRASHED: + switch ((virDomainEventCrashedDetailType) detail) { + case VIR_DOMAIN_EVENT_CRASHED_PANICKED: + ret = "Panicked"; + break; + } + break; } return ret; } diff --git a/include/libvirt/libvirt.h.in b/include/libvirt/libvirt.h.in index 1804c93..56c6c5c 100644 --- a/include/libvirt/libvirt.h.in +++ b/include/libvirt/libvirt.h.in @@ -155,6 +155,7 @@ typedef enum { VIR_DOMAIN_RUNNING_SAVE_CANCELED = 7, /* returned from failed save process */ VIR_DOMAIN_RUNNING_WAKEUP = 8, /* returned from pmsuspended due to wakeup event */ + VIR_DOMAIN_RUNNING_CRASHED = 9, /* resumed from crashed */ #ifdef VIR_ENUM_SENTINELS VIR_DOMAIN_RUNNING_LAST @@ -180,6 +181,7 @@ typedef enum { VIR_DOMAIN_PAUSED_FROM_SNAPSHOT = 7, /* paused after restoring from snapshot */ VIR_DOMAIN_PAUSED_SHUTTING_DOWN = 8, /* paused during shutdown process */ VIR_DOMAIN_PAUSED_SNAPSHOT = 9, /* paused while creating a snapshot */ + VIR_DOMAIN_PAUSED_GUEST_PANICKED = 10, /* paused due to a guest panicked event */ #ifdef VIR_ENUM_SENTINELS VIR_DOMAIN_PAUSED_LAST @@ -189,6 +191,7 @@ typedef enum { typedef enum { VIR_DOMAIN_SHUTDOWN_UNKNOWN = 0, /* the reason is unknown */ VIR_DOMAIN_SHUTDOWN_USER = 1, /* shutting down on user request */ + VIR_DOMAIN_SHUTDOWN_CRASHED = 2, /* domain crashed */ #ifdef VIR_ENUM_SENTINELS VIR_DOMAIN_SHUTDOWN_LAST @@ -212,6 +215,7 @@ typedef enum { typedef enum { VIR_DOMAIN_CRASHED_UNKNOWN = 0, /* crashed for unknown reason */ + VIR_DOMAIN_CRASHED_PANICKED = 1, /* domain panicked */ #ifdef VIR_ENUM_SENTINELS VIR_DOMAIN_CRASHED_LAST @@ -3319,6 +3323,7 @@ typedef enum { VIR_DOMAIN_EVENT_STOPPED = 5, VIR_DOMAIN_EVENT_SHUTDOWN = 6, VIR_DOMAIN_EVENT_PMSUSPENDED = 7, + VIR_DOMAIN_EVENT_CRASHED = 8, #ifdef VIR_ENUM_SENTINELS VIR_DOMAIN_EVENT_LAST @@ -3450,6 +3455,17 @@ typedef enum { #endif } virDomainEventPMSuspendedDetailType; +/* + * Details about the 'crashed' lifecycle event + */ +typedef enum { + VIR_DOMAIN_EVENT_CRASHED_PANICKED = 0, /* Guest was panicked */ + +#ifdef VIR_ENUM_SENTINELS + VIR_DOMAIN_EVENT_CRASHED_LAST +#endif +} virDomainEventCrashedDetailType; + /** * virConnectDomainEventCallback: * @conn: virConnect connection diff --git a/src/conf/domain_conf.c b/src/conf/domain_conf.c index a9656af..3f0786e 100644 --- a/src/conf/domain_conf.c +++ b/src/conf/domain_conf.c @@ -642,7 +642,8 @@ VIR_ENUM_IMPL(virDomainRunningReason, VIR_DOMAIN_RUNNING_LAST, "unpaused", "migration canceled", "save canceled", - "wakeup") + "wakeup", + "from crashed") VIR_ENUM_IMPL(virDomainBlockedReason, VIR_DOMAIN_BLOCKED_LAST, "unknown") @@ -657,11 +658,13 @@ VIR_ENUM_IMPL(virDomainPausedReason, VIR_DOMAIN_PAUSED_LAST, "watchdog", "from snapshot", "shutdown", - "snapshot") + "snapshot", + "guest panicked") VIR_ENUM_IMPL(virDomainShutdownReason, VIR_DOMAIN_SHUTDOWN_LAST, "unknown", - "user") + "user", + "crashed") VIR_ENUM_IMPL(virDomainShutoffReason, VIR_DOMAIN_SHUTOFF_LAST, "unknown", @@ -674,7 +677,8 @@ VIR_ENUM_IMPL(virDomainShutoffReason, VIR_DOMAIN_SHUTOFF_LAST, "from snapshot") VIR_ENUM_IMPL(virDomainCrashedReason, VIR_DOMAIN_CRASHED_LAST, - "unknown") + "unknown", + "panicked") VIR_ENUM_IMPL(virDomainPMSuspendedReason, VIR_DOMAIN_PMSUSPENDED_LAST, "unknown") @@ -10943,7 +10947,7 @@ virDomainDefParseXML(xmlDocPtr xml, if (virDomainEventActionParseXML(ctxt, "on_crash", "string(./on_crash[1])", &def->onCrash, - VIR_DOMAIN_LIFECYCLE_CRASH_DESTROY, + VIR_DOMAIN_LIFECYCLE_CRASH_PRESERVE, virDomainLifecycleCrashTypeFromString) < 0) goto error; diff --git a/src/qemu/qemu_monitor.c b/src/qemu/qemu_monitor.c index 4e35f79..e0cd62c 100644 --- a/src/qemu/qemu_monitor.c +++ b/src/qemu/qemu_monitor.c @@ -113,7 +113,7 @@ VIR_ENUM_IMPL(qemuMonitorVMStatus, QEMU_MONITOR_VM_STATUS_LAST, "debug", "inmigrate", "internal-error", "io-error", "paused", "postmigrate", "prelaunch", "finish-migrate", "restore-vm", - "running", "save-vm", "shutdown", "watchdog") + "running", "save-vm", "shutdown", "watchdog", "guest-panicked") typedef enum { QEMU_MONITOR_BLOCK_IO_STATUS_OK, @@ -1032,6 +1032,15 @@ int qemuMonitorEmitResume(qemuMonitorPtr mon) } +int qemuMonitorEmitGUESTPanicked(qemuMonitorPtr mon) +{ + int ret = -1; + VIR_DEBUG("mon=%p", mon); + QEMU_MONITOR_CALLBACK(mon, ret, domainGUESTPanicked, mon->vm); + return ret; +} + + int qemuMonitorEmitRTCChange(qemuMonitorPtr mon, long long offset) { int ret = -1; @@ -3185,6 +3194,9 @@ int qemuMonitorVMStatusToPausedReason(const char *status) case QEMU_MONITOR_VM_STATUS_WATCHDOG: return VIR_DOMAIN_PAUSED_WATCHDOG; + case QEMU_MONITOR_VM_STATUS_GUEST_PANICKED: + return VIR_DOMAIN_PAUSED_GUEST_PANICKED; + /* unreachable from this point on */ case QEMU_MONITOR_VM_STATUS_LAST: ; diff --git a/src/qemu/qemu_monitor.h b/src/qemu/qemu_monitor.h index a607712..543050c 100644 --- a/src/qemu/qemu_monitor.h +++ b/src/qemu/qemu_monitor.h @@ -140,6 +140,8 @@ struct _qemuMonitorCallbacks { unsigned long long actual); int (*domainPMSuspendDisk)(qemuMonitorPtr mon, virDomainObjPtr vm); + int (*domainGUESTPanicked)(qemuMonitorPtr mon, + virDomainObjPtr vm); }; char *qemuMonitorEscapeArg(const char *in); @@ -220,6 +222,8 @@ int qemuMonitorEmitBlockJob(qemuMonitorPtr mon, int qemuMonitorEmitBalloonChange(qemuMonitorPtr mon, unsigned long long actual); int qemuMonitorEmitPMSuspendDisk(qemuMonitorPtr mon); +int qemuMonitorEmitGUESTPanicked(qemuMonitorPtr mon); + int qemuMonitorStartCPUs(qemuMonitorPtr mon, virConnectPtr conn); @@ -239,6 +243,7 @@ typedef enum { QEMU_MONITOR_VM_STATUS_SAVE_VM, QEMU_MONITOR_VM_STATUS_SHUTDOWN, QEMU_MONITOR_VM_STATUS_WATCHDOG, + QEMU_MONITOR_VM_STATUS_GUEST_PANICKED, QEMU_MONITOR_VM_STATUS_LAST } qemuMonitorVMStatus; diff --git a/src/qemu/qemu_monitor_json.c b/src/qemu/qemu_monitor_json.c index 2b73884..b6efa52 100644 --- a/src/qemu/qemu_monitor_json.c +++ b/src/qemu/qemu_monitor_json.c @@ -74,6 +74,7 @@ static void qemuMonitorJSONHandleBlockJobCanceled(qemuMonitorPtr mon, virJSONVal static void qemuMonitorJSONHandleBlockJobReady(qemuMonitorPtr mon, virJSONValuePtr data); static void qemuMonitorJSONHandleBalloonChange(qemuMonitorPtr mon, virJSONValuePtr data); static void qemuMonitorJSONHandlePMSuspendDisk(qemuMonitorPtr mon, virJSONValuePtr data); +static void qemuMonitorJSONHandleGUESTPanicked(qemuMonitorPtr mon, virJSONValuePtr data); typedef struct { const char *type; @@ -87,6 +88,7 @@ static qemuEventHandler eventHandlers[] = { { "BLOCK_JOB_COMPLETED", qemuMonitorJSONHandleBlockJobCompleted, }, { "BLOCK_JOB_READY", qemuMonitorJSONHandleBlockJobReady, }, { "DEVICE_TRAY_MOVED", qemuMonitorJSONHandleTrayChange, }, + { "GUEST_PANICKED", qemuMonitorJSONHandleGUESTPanicked, }, { "POWERDOWN", qemuMonitorJSONHandlePowerdown, }, { "RESET", qemuMonitorJSONHandleReset, }, { "RESUME", qemuMonitorJSONHandleResume, }, @@ -593,6 +595,11 @@ static void qemuMonitorJSONHandleResume(qemuMonitorPtr mon, virJSONValuePtr data qemuMonitorEmitResume(mon); } +static void qemuMonitorJSONHandleGUESTPanicked(qemuMonitorPtr mon, virJSONValuePtr data ATTRIBUTE_UNUSED) +{ + qemuMonitorEmitGUESTPanicked(mon); +} + static void qemuMonitorJSONHandleRTCChange(qemuMonitorPtr mon, virJSONValuePtr data) { long long offset = 0; diff --git a/src/qemu/qemu_process.c b/src/qemu/qemu_process.c index d4fd4fb..1dc1f3a 100644 --- a/src/qemu/qemu_process.c +++ b/src/qemu/qemu_process.c @@ -548,6 +548,7 @@ qemuProcessFakeReboot(void *opaque) qemuDomainObjPrivatePtr priv = vm->privateData; virDomainEventPtr event = NULL; virQEMUDriverConfigPtr cfg = virQEMUDriverGetConfig(driver); + virDomainRunningReason reason = VIR_DOMAIN_RUNNING_BOOTED; int ret = -1; VIR_DEBUG("vm=%p", vm); virObjectLock(vm); @@ -573,8 +574,11 @@ qemuProcessFakeReboot(void *opaque) goto endjob; } + if (virDomainObjGetState(vm, NULL) == VIR_DOMAIN_CRASHED) + reason = VIR_DOMAIN_RUNNING_CRASHED; + if (qemuProcessStartCPUs(driver, vm, NULL, - VIR_DOMAIN_RUNNING_BOOTED, + reason, QEMU_ASYNC_JOB_NONE) < 0) { if (virGetLastError() == NULL) virReportError(VIR_ERR_INTERNAL_ERROR, @@ -1269,6 +1273,98 @@ qemuProcessHandlePMSuspendDisk(qemuMonitorPtr mon ATTRIBUTE_UNUSED, return 0; } +static int +qemuProcessHandleGUESTPanicked(qemuMonitorPtr mon ATTRIBUTE_UNUSED, + virDomainObjPtr vm) +{ + virQEMUDriverPtr driver = qemu_driver; + qemuDomainObjPrivatePtr priv; + virDomainEventPtr event = NULL; + bool isReboot = true; + virQEMUDriverConfigPtr cfg = virQEMUDriverGetConfig(driver); + + VIR_DEBUG("vm=%p", vm); + + virObjectLock(vm); + + if (!virDomainObjIsActive(vm)) { + VIR_DEBUG("Ignoring GUEST_PANICKED event from inactive domain %s", + vm->def->name); + goto cleanup; + } + + priv = vm->privateData; + + virDomainObjSetState(vm, + VIR_DOMAIN_CRASHED, + VIR_DOMAIN_CRASHED_PANICKED); + + event = virDomainEventNewFromObj(vm, + VIR_DOMAIN_EVENT_CRASHED, + VIR_DOMAIN_EVENT_CRASHED_PANICKED); + + if (vm->def->onCrash == VIR_DOMAIN_LIFECYCLE_CRASH_PRESERVE) { + VIR_FREE(priv->lockState); + + if (virDomainLockProcessPause(driver->lockManager, vm, &priv->lockState) < 0) + VIR_WARN("Unable to release lease on %s", vm->def->name); + VIR_DEBUG("Preserving lock state '%s'", NULLSTR(priv->lockState)); + + if (virDomainSaveStatus(driver->xmlopt, cfg->stateDir, vm) < 0) { + VIR_WARN("Unable to save status on vm %s after state change", + vm->def->name); + } + + goto cleanup; + } + + if (vm->def->onCrash == VIR_DOMAIN_LIFECYCLE_CRASH_DESTROY) { + isReboot = false; + VIR_INFO("Domain on_crash setting overridden, shutting down"); + } + + qemuDomainSetFakeReboot(driver, vm, isReboot); + + if (isReboot) { + qemuProcessShutdownOrReboot(driver, vm); + } else { + priv->beingDestroyed = true; + + if (qemuProcessKill(vm, VIR_QEMU_PROCESS_KILL_FORCE) < 0) { + priv->beingDestroyed = false; + goto cleanup; + } + + priv->beingDestroyed = false; + + if (! virDomainObjIsActive(vm)) { + virReportError(VIR_ERR_OPERATION_INVALID, + "%s", _("domain is not running")); + goto cleanup; + } + + qemuProcessStop(driver, vm, VIR_DOMAIN_SHUTOFF_CRASHED, 0); + event = virDomainEventNewFromObj(vm, + VIR_DOMAIN_EVENT_STOPPED, + VIR_DOMAIN_EVENT_STOPPED_CRASHED); + + virDomainAuditStop(vm, "destroyed"); + + if (! vm->persistent) { + qemuDomainRemoveInactive(driver, vm); + vm = NULL; + } + } + +cleanup: + if (vm) + virObjectUnlock(vm); + if (event) + qemuDomainEventQueue(driver, event); + virObjectUnref(cfg); + + return 0; +} static qemuMonitorCallbacks monitorCallbacks = { .destroy = qemuProcessHandleMonitorDestroy, @@ -1289,6 +1385,7 @@ static qemuMonitorCallbacks monitorCallbacks = { .domainPMSuspend = qemuProcessHandlePMSuspend, .domainBalloonChange = qemuProcessHandleBalloonChange, .domainPMSuspendDisk = qemuProcessHandlePMSuspendDisk, + .domainGUESTPanicked = qemuProcessHandleGUESTPanicked, }; static int diff --git a/tools/virsh-domain-monitor.c b/tools/virsh-domain-monitor.c index 5ed89d1..4bddefe 100644 --- a/tools/virsh-domain-monitor.c +++ b/tools/virsh-domain-monitor.c @@ -192,6 +192,8 @@ vshDomainStateReasonToString(int state, int reason) return N_("save canceled"); case VIR_DOMAIN_RUNNING_WAKEUP: return N_("event wakeup"); + case VIR_DOMAIN_RUNNING_CRASHED: + return N_("from crashed"); case VIR_DOMAIN_RUNNING_UNKNOWN: case VIR_DOMAIN_RUNNING_LAST: ; @@ -226,6 +228,8 @@ vshDomainStateReasonToString(int state, int reason) return N_("shutting down"); case VIR_DOMAIN_PAUSED_SNAPSHOT: return N_("creating snapshot"); + case VIR_DOMAIN_PAUSED_GUEST_PANICKED: + return N_("guest panicked"); case VIR_DOMAIN_PAUSED_UNKNOWN: case VIR_DOMAIN_PAUSED_LAST: ; @@ -236,6 +240,8 @@ vshDomainStateReasonToString(int state, int reason) switch ((virDomainShutdownReason) reason) { case VIR_DOMAIN_SHUTDOWN_USER: return N_("user"); + case VIR_DOMAIN_SHUTDOWN_CRASHED: + return N_("crashed"); case VIR_DOMAIN_SHUTDOWN_UNKNOWN: case VIR_DOMAIN_SHUTDOWN_LAST: ; @@ -266,6 +272,8 @@ vshDomainStateReasonToString(int state, int reason) case VIR_DOMAIN_CRASHED: switch ((virDomainCrashedReason) reason) { + case VIR_DOMAIN_CRASHED_PANICKED: + return N_("panicked"); case VIR_DOMAIN_CRASHED_UNKNOWN: case VIR_DOMAIN_CRASHED_LAST: ; -- 1.8.1.4

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[libvirt] [PATCH] Expose all CPU features in host definition
by Don Dugger 28 May '13

28 May '13

I've opened BZ 697141 on this as I would consider it more a bug than a feature request. Anyway, to re-iterate my rationale from the BZ: The virConnectGetCapabilities API describes the host capabilities by returning an XML description that includes the CPU model name and a set of CPU features. The problem is that any features that are part of the CPU model are not explicitly listed, they are assumed to be part of the definition of that CPU model. This makes it extremely difficult for the caller of this API to check for the presence of a specific CPU feature, the caller would have to know what features are part of which CPU models, a very daunting task. This patch solves this problem by having the API return a model name, as it currently does, but it will also explicitly list all of the CPU features that are present. This would make it much easier for a caller of this API to check for specific features. Signed-off-by: Don Dugger <donald.d.dugger(a)intel.com> --- src/cpu/cpu_x86.c | 30 ++++++++++++++++++++++++++++++ 1 file changed, 30 insertions(+) diff --git a/src/cpu/cpu_x86.c b/src/cpu/cpu_x86.c index 5d479c2..b2e16df 100644 --- a/src/cpu/cpu_x86.c +++ b/src/cpu/cpu_x86.c @@ -1296,6 +1296,35 @@ x86GuestData(virCPUDefPtr host, return x86Compute(host, guest, data, message); } +static void +x86AddFeatures(virCPUDefPtr cpu, + struct x86_map *map) +{ + const struct x86_model *candidate; + const struct x86_feature *feature = map->features; + + candidate = map->models; + while (candidate != NULL) { + if (STREQ(cpu->model, candidate->name)) + break; + candidate = candidate->next; + } + if (!candidate) { + VIR_WARN("Odd, %s not a known CPU model\n", cpu->model); + return; + } + while (feature != NULL) { + if (x86DataIsSubset(candidate->data, feature->data)) { + if (virCPUDefAddFeature(cpu, feature->name, VIR_CPU_FEATURE_DISABLE) < 0) { + VIR_WARN("CPU model %s, no room for feature %s", cpu->model, feature->name); + return; + } + } + feature = feature->next; + } + return; +} + static int x86Decode(virCPUDefPtr cpu, @@ -1383,6 +1412,7 @@ x86Decode(virCPUDefPtr cpu, goto out; } + x86AddFeatures(cpuModel, map); cpu->model = cpuModel->model; cpu->vendor = cpuModel->vendor; cpu->nfeatures = cpuModel->nfeatures; -- 1.7.10.4

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[libvirt] Issues with qemu-nbd over AF_UNIX and virDomainAttachDevice
by Deepak C Shetty 28 May '13

28 May '13

Hi List, Facing issues trying to use virDomainAttachDevice API of libvirt from python. Here is what I am trying to do 1) Setup qemu-nbd to export a qcow2 disk image over unix socket on my localhost qemu-nbd -t -k /tmp/mysock2 /home/dpkshetty/work/img/iscsi_disk The above blocks. and i am able to use qemu-system-x86_64 -drive file=nbd:unix:/tmp/mysock2 Just to test it...and it works. Since currently the disk is a blank disk.. I see "No bootable device" and QEMU stops.. whcih is expected So qemu-nbd is setup and working properly 2) >>> print nbdxml <disk type='network' device='disk'> <driver name="qemu" type="qcow2"/> <source protocol="nbd"> <host name="deepakcs-lx" port="10809" transport="unix" socket="/tmp/mysock2" /> </source> <target dev="vdc" bus="virtio" /> </disk> >>> dom.attachDevice(nbdxml) libvir: QEMU error : operation failed: open disk image file failed Traceback (most recent call last): File "<stdin>", line 1, in <module> File "/usr/lib64/python2.7/site-packages/libvirt.py", line 400, in attachDevice if ret == -1: raise libvirtError ('virDomainAttachDevice() failed', dom=self) libvirt.libvirtError: operation failed: open disk image file failed and I see... in the VM's log.... inet_connect_opts: connect(ipv4,deepakcs-lx.local.lan,192.168.1.7,10809): Connection refused 3) I tried usign virsh attach-device.. and the same problem happens 4) firewall/iptables are not running. SELinux is permissive 5) I tried appending -p 1111 to the qemu-nbd cmdline and using port="1111" in the XML.. but that doesn't help, see the same error Questions/Observations : 1) What am i doing wrong here ? In the <host> tag, port attr is mandatory.. but looking at `netstat -nptl` I don't see any process listeing on 10809 or 1111 (when i gave -p 1111 ). So does this mean there is no way for libvirt to just directly open the socket and use it.. Its trying to connect to the port i give in the XML and since no one is listening there.. it fails.. hence the error seen in the VM logs.... Has anybody tryign usign qemu-nbd and attaching that disk as I am doign above ? Is it legal, if not, why ? 2) The VM/Domain is active during all of the above steps. 3) IIUC... for the above usecase... port attr of <host> should be optional... such that libvirt can directly do the equivalent of ` -drive file=nbd:unix:/tmp/mysock2` and add this as a NBD device to the runnign guest/Domain... but currently port and hostname are mandatory. For unix sockets... hostname will always be local...so i feel both hostname & port should be optional for the above usecase ? 4) I haven't yet tried doing the above when guest/Domain is Inactive. 5) I haven't yet tried doing the above usign nbd-server or qemu-nbd usign -c option (which i believe starts qemu-nbd in server mode, but need nbd.ko kernel module to be loaded). I am hoping using either of these might get it working... since we have a process listening on a port on the host... but I wanted to get this working using plain unix sockets.. lightweight and doesn't need nbd.ko Comments/Suggestions appreciated. thanx, deepak

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