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[libvirt] [PATCH 10/15] Fully asynchronous monitor I/O processing



Change the QEMU monitor file handle watch to poll for both
read & write events, as well as EOF. All I/O to/from the
QEMU monitor FD is now done in the event callback thread.

When the QEMU driver needs to send a command, it puts the
data to be sent into a qemuMonitorMessagePtr object instance,
queues it for dispatch, and then goes to sleep on a condition
variable. The event thread sends all the data, and then waits
for the reply to arrive, putting the response / error data
back into the qemuMonitorMessagePtr and notifying the condition
variable.

* src/qemu/qemu_driver.c: XXX this change shouldn't be here
* src/qemu/qemu_monitor.c, src/qemu/qemu_monitor.h: Remove
  raw I/O functions, and a generic qemuMonitorSend() for
  invoking a command
* src/qemu/qemu_monitor_text.c, src/qemu/qemu_monitor_text.h:
  Remove all low level I/O, and use the new qemuMonitorSend()
  API. Provide a qemuMonitorTextIOProcess() method for detecting
  command/reply/prompt boundaries in the monitor data stream
---
 .x-sc_avoid_write            |    1 +
 src/conf/domain_conf.c       |    3 +-
 src/qemu/qemu_driver.c       |   64 ++++--
 src/qemu/qemu_monitor.c      |  549 ++++++++++++++++++++++++++----------------
 src/qemu/qemu_monitor.h      |   46 +++--
 src/qemu/qemu_monitor_text.c |  402 +++++++++++++++++--------------
 src/qemu/qemu_monitor_text.h |    5 +
 7 files changed, 650 insertions(+), 420 deletions(-)

diff --git a/.x-sc_avoid_write b/.x-sc_avoid_write
index 111fb28..1f893b8 100644
--- a/.x-sc_avoid_write
+++ b/.x-sc_avoid_write
@@ -1,5 +1,6 @@
 ^src/libvirt\.c$
 ^src/qemu/qemu_driver\.c$
+^src/qemu/qemu_monitor\.c$
 ^src/util/util\.c$
 ^src/xen/xend_internal\.c$
 ^daemon/libvirtd.c$
diff --git a/src/conf/domain_conf.c b/src/conf/domain_conf.c
index 79bb274..b42fdc5 100644
--- a/src/conf/domain_conf.c
+++ b/src/conf/domain_conf.c
@@ -4870,7 +4870,8 @@ static virDomainObjPtr virDomainLoadStatus(virConnectPtr conn,
     return obj;
 
 error:
-    virDomainObjUnref(obj);
+    if (obj)
+        virDomainObjUnref(obj);
     VIR_FREE(statusFile);
     return NULL;
 }
diff --git a/src/qemu/qemu_driver.c b/src/qemu/qemu_driver.c
index 82cad69..fea439b 100644
--- a/src/qemu/qemu_driver.c
+++ b/src/qemu/qemu_driver.c
@@ -345,9 +345,8 @@ qemuHandleMonitorEOF(qemuMonitorPtr mon ATTRIBUTE_UNUSED,
     struct qemud_driver *driver = qemu_driver;
     virDomainEventPtr event = NULL;
 
-    qemuDriverLock(driver);
+    VIR_DEBUG("Received EOF on %p '%s'", vm, vm->def->name);
     virDomainObjLock(vm);
-    qemuDriverUnlock(driver);
 
     event = virDomainEventNewFromObj(vm,
                                      VIR_DOMAIN_EVENT_STOPPED,
@@ -411,11 +410,24 @@ findVolumeQcowPassphrase(qemuMonitorPtr mon ATTRIBUTE_UNUSED,
     char *passphrase;
     unsigned char *data;
     size_t size;
+    int ret = -1;
+
+    /* XXX
+     * We ought to be taking the lock here, but that would
+     * require that it be released when monitor commands are
+     * run. Currently we deadlock if we try to take it again
+     *
+     * Until this is resolved, don't take the lock and rely
+     * on fact that the thread invoking this callback is
+     * running lock-step with the thread holding the lock
+     *
+     * virDomainObjLock(vm);
+     */
 
     if (!conn) {
         qemudReportError(NULL, NULL, NULL, VIR_ERR_NO_SUPPORT,
                          "%s", _("cannot find secrets without a connection"));
-        return -1;
+        goto cleanup;
     }
 
     if (conn->secretDriver == NULL ||
@@ -423,7 +435,7 @@ findVolumeQcowPassphrase(qemuMonitorPtr mon ATTRIBUTE_UNUSED,
         conn->secretDriver->getValue == NULL) {
         qemudReportError(conn, NULL, NULL, VIR_ERR_NO_SUPPORT, "%s",
                          _("secret storage not supported"));
-        return -1;
+        goto cleanup;
     }
 
     enc = findDomainDiskEncryption(conn, vm, path);
@@ -436,18 +448,18 @@ findVolumeQcowPassphrase(qemuMonitorPtr mon ATTRIBUTE_UNUSED,
         VIR_STORAGE_ENCRYPTION_SECRET_TYPE_PASSPHRASE) {
         qemudReportError(conn, NULL, NULL, VIR_ERR_INVALID_DOMAIN,
                          _("invalid <encryption> for volume %s"), path);
-        return -1;
+        goto cleanup;
     }
 
     secret = conn->secretDriver->lookupByUUID(conn,
                                               enc->secrets[0]->uuid);
     if (secret == NULL)
-        return -1;
+        goto cleanup;
     data = conn->secretDriver->getValue(secret, &size,
                                         VIR_SECRET_GET_VALUE_INTERNAL_CALL);
     virUnrefSecret(secret);
     if (data == NULL)
-        return -1;
+        goto cleanup;
 
     if (memchr(data, '\0', size) != NULL) {
         memset(data, 0, size);
@@ -455,14 +467,14 @@ findVolumeQcowPassphrase(qemuMonitorPtr mon ATTRIBUTE_UNUSED,
         qemudReportError(conn, NULL, NULL, VIR_ERR_INVALID_SECRET,
                          _("format='qcow' passphrase for %s must not contain a "
                            "'\\0'"), path);
-        return -1;
+        goto cleanup;
     }
 
     if (VIR_ALLOC_N(passphrase, size + 1) < 0) {
         memset(data, 0, size);
         VIR_FREE(data);
         virReportOOMError(conn);
-        return -1;
+        goto cleanup;
     }
     memcpy(passphrase, data, size);
     passphrase[size] = '\0';
@@ -473,15 +485,24 @@ findVolumeQcowPassphrase(qemuMonitorPtr mon ATTRIBUTE_UNUSED,
     *secretRet = passphrase;
     *secretLen = size;
 
-    return 0;
+    ret = 0;
+
+cleanup:
+    /*
+     * XXX
+     * See earlier comment about lock
+     *
+     * virDomainObjUnlock(vm);
+     */
+    return ret;
 }
 
 static int
-qemuConnectMonitor(virDomainObjPtr vm, int reconnect)
+qemuConnectMonitor(virDomainObjPtr vm)
 {
     qemuDomainObjPrivatePtr priv = vm->privateData;
 
-    if ((priv->mon = qemuMonitorOpen(vm, reconnect, qemuHandleMonitorEOF)) == NULL) {
+    if ((priv->mon = qemuMonitorOpen(vm, qemuHandleMonitorEOF)) == NULL) {
         VIR_ERROR(_("Failed to connect monitor for %s\n"), vm->def->name);
         return -1;
     }
@@ -504,7 +525,10 @@ qemuReconnectDomain(void *payload, const char *name ATTRIBUTE_UNUSED, void *opaq
 
     virDomainObjLock(obj);
 
-    if (qemuConnectMonitor(obj, 1) < 0)
+    VIR_DEBUG("Reconnect monitor to %p '%s'", obj, obj->def->name);
+
+    /* XXX check PID liveliness & EXE path */
+    if (qemuConnectMonitor(obj) < 0)
         goto error;
 
     if (qemuUpdateActivePciHostdevs(driver, obj->def) < 0) {
@@ -528,7 +552,10 @@ error:
      * to remove danger of it ending up running twice if
      * user tries to start it again later */
     qemudShutdownVMDaemon(NULL, driver, obj);
-    virDomainObjUnlock(obj);
+    if (!obj->persistent)
+        virDomainRemoveInactive(&driver->domains, obj);
+    else
+        virDomainObjUnlock(obj);
 }
 
 /**
@@ -1130,7 +1157,8 @@ qemudWaitForMonitor(virConnectPtr conn,
         return -1;
     }
 
-    if (qemuConnectMonitor(vm, 0) < 0)
+    VIR_DEBUG("Connect monitor to %p '%s'", vm, vm->def->name);
+    if (qemuConnectMonitor(vm) < 0)
         return -1;
 
     return 0;
@@ -2177,7 +2205,7 @@ static void qemudShutdownVMDaemon(virConnectPtr conn,
     if (!virDomainObjIsActive(vm))
         return;
 
-    VIR_DEBUG(_("Shutting down VM '%s'\n"), vm->def->name);
+    VIR_DEBUG("Shutting down VM '%s'", vm->def->name);
 
     if (virKillProcess(vm->pid, 0) == 0 &&
         virKillProcess(vm->pid, SIGTERM) < 0)
@@ -6212,6 +6240,10 @@ qemudDomainMigratePrepareTunnel(virConnectPtr dconn,
     qemust = qemuStreamMigOpen(st, unixfile);
     if (qemust == NULL) {
         qemudShutdownVMDaemon(NULL, driver, vm);
+        if (!vm->persistent) {
+            virDomainRemoveInactive(&driver->domains, vm);
+            vm = NULL;
+        }
         virReportSystemError(dconn, errno,
                              _("cannot open unix socket '%s' for tunnelled migration"),
                              unixfile);
diff --git a/src/qemu/qemu_monitor.c b/src/qemu/qemu_monitor.c
index fd1c5e9..3e6a490 100644
--- a/src/qemu/qemu_monitor.c
+++ b/src/qemu/qemu_monitor.c
@@ -40,6 +40,9 @@
 
 struct _qemuMonitor {
     virMutex lock;
+    virCond notify;
+
+    virDomainObjPtr dom;
 
     int fd;
     int watch;
@@ -49,6 +52,25 @@ struct _qemuMonitor {
 
     qemuMonitorEOFNotify eofCB;
     qemuMonitorDiskSecretLookup secretCB;
+
+    /* If there's a command being processed this will be
+     * non-NULL */
+    qemuMonitorMessagePtr msg;
+
+    /* Buffer incoming data ready for Text/QMP monitor
+     * code to process & find message boundaries */
+    size_t bufferOffset;
+    size_t bufferLength;
+    char *buffer;
+
+    /* If anything went wrong, this will be fed back
+     * the next monitor msg */
+    int lastErrno;
+
+    /* If the monitor callback is currently active */
+    unsigned eofcb: 1;
+    /* If the monitor callback should free the closed monitor */
+    unsigned closed: 1;
 };
 
 void qemuMonitorLock(qemuMonitorPtr mon)
@@ -61,134 +83,25 @@ void qemuMonitorUnlock(qemuMonitorPtr mon)
     virMutexUnlock(&mon->lock);
 }
 
-/* Return -1 for error, 1 to continue reading and 0 for success */
-typedef int qemuMonitorHandleOutput(virDomainObjPtr vm,
-                                    const char *output);
-
-/*
- * Returns -1 for error, 0 on end-of-file, 1 for success
- */
-static int
-qemuMonitorReadOutput(virDomainObjPtr vm,
-                      int fd,
-                      char *buf,
-                      size_t buflen,
-                      qemuMonitorHandleOutput func,
-                      const char *what,
-                      int timeout)
-{
-    size_t got = 0;
-    buf[0] = '\0';
-    timeout *= 1000; /* poll wants milli seconds */
-
-    /* Consume & discard the initial greeting */
-    while (got < (buflen-1)) {
-        ssize_t ret;
-
-        ret = read(fd, buf+got, buflen-got-1);
-
-        if (ret < 0) {
-            struct pollfd pfd = { .fd = fd, .events = POLLIN };
-            if (errno == EINTR)
-                continue;
-
-            if (errno != EAGAIN) {
-                virReportSystemError(NULL, errno,
-                                     _("Failure while reading %s startup output"),
-                                     what);
-                return -1;
-            }
 
-            ret = poll(&pfd, 1, timeout);
-            if (ret == 0) {
-                qemudReportError(NULL, NULL, NULL, VIR_ERR_INTERNAL_ERROR,
-                                 _("Timed out while reading %s startup output"), what);
-                return -1;
-            } else if (ret == -1) {
-                if (errno != EINTR) {
-                    virReportSystemError(NULL, errno,
-                                         _("Failure while reading %s startup output"),
-                                         what);
-                    return -1;
-                }
-            } else {
-                /* Make sure we continue loop & read any further data
-                   available before dealing with EOF */
-                if (pfd.revents & (POLLIN | POLLHUP))
-                    continue;
-
-                qemudReportError(NULL, NULL, NULL, VIR_ERR_INTERNAL_ERROR,
-                                 _("Failure while reading %s startup output"), what);
-                return -1;
-            }
-        } else if (ret == 0) {
-            return 0;
-        } else {
-            got += ret;
-            buf[got] = '\0';
-            ret = func(vm, buf);
-            if (ret == -1)
-                return -1;
-            if (ret == 1)
-                continue;
-            return 1;
-        }
-    }
-
-    qemudReportError(NULL, NULL, NULL, VIR_ERR_INTERNAL_ERROR,
-                     _("Out of space while reading %s startup output"), what);
-    return -1;
-
-}
-
-static int
-qemuMonitorCheckPrompt(virDomainObjPtr vm ATTRIBUTE_UNUSED,
-                       const char *output)
+static void qemuMonitorFree(qemuMonitorPtr mon, int lockDomain)
 {
-    if (strstr(output, "(qemu) ") == NULL)
-        return 1; /* keep reading */
-
-    return 0;
-}
-
-static int
-qemuMonitorOpenCommon(virDomainObjPtr vm,
-                      int monfd,
-                      int reconnect)
-{
-    char buf[1024];
-    int ret;
-
-    if (virSetCloseExec(monfd) < 0) {
-        qemudReportError(NULL, NULL, NULL, VIR_ERR_INTERNAL_ERROR,
-                         "%s", _("Unable to set monitor close-on-exec flag"));
-        return -1;
-    }
-    if (virSetNonBlock(monfd) < 0) {
-        qemudReportError(NULL, NULL, NULL, VIR_ERR_INTERNAL_ERROR,
-                         "%s", _("Unable to put monitor into non-blocking mode"));
-        return -1;
-    }
-
-    if (!reconnect) {
-        if (qemuMonitorReadOutput(vm, monfd,
-                                  buf, sizeof(buf),
-                                  qemuMonitorCheckPrompt,
-                                  "monitor", 10) <= 0)
-            ret = -1;
-        else
-            ret = 0;
-    } else {
-        ret = 0;
+    VIR_DEBUG("mon=%p, lockDomain=%d", mon, lockDomain);
+    if (mon->vm) {
+        if (lockDomain)
+            virDomainObjLock(mon->vm);
+        if (!virDomainObjUnref(mon->vm) && lockDomain)
+            virDomainObjUnlock(mon->vm);
     }
-
-    return ret;
+    if (virCondDestroy(&mon->notify) < 0)
+    {}
+    virMutexDestroy(&mon->lock);
+    VIR_FREE(mon);
 }
 
+
 static int
-qemuMonitorOpenUnix(virDomainObjPtr vm,
-                    const char *monitor,
-                    int reconnect)
+qemuMonitorOpenUnix(const char *monitor)
 {
     struct sockaddr_un addr;
     int monfd;
@@ -233,9 +146,6 @@ qemuMonitorOpenUnix(virDomainObjPtr vm,
         goto error;
     }
 
-    if (qemuMonitorOpenCommon(vm, monfd, reconnect) < 0)
-        goto error;
-
     return monfd;
 
 error:
@@ -244,9 +154,7 @@ error:
 }
 
 static int
-qemuMonitorOpenPty(virDomainObjPtr vm,
-                   const char *monitor,
-                   int reconnect)
+qemuMonitorOpenPty(const char *monitor)
 {
     int monfd;
 
@@ -256,14 +164,181 @@ qemuMonitorOpenPty(virDomainObjPtr vm,
         return -1;
     }
 
-    if (qemuMonitorOpenCommon(vm, monfd, reconnect) < 0)
-        goto error;
-
     return monfd;
+}
 
-error:
-    close(monfd);
-    return -1;
+
+static int
+qemuMonitorIOProcess(qemuMonitorPtr mon)
+{
+    int len;
+    qemuMonitorMessagePtr msg = NULL;
+
+    /* See if there's a message & whether its ready for its reply
+     * ie whether its completed writing all its data */
+    if (mon->msg && mon->msg->txOffset == mon->msg->txLength)
+        msg = mon->msg;
+
+    VIR_DEBUG("Process %d", mon->bufferOffset);
+    len = qemuMonitorTextIOProcess(mon,
+                                   mon->buffer, mon->bufferOffset,
+                                   msg);
+
+    if (len < 0) {
+        mon->lastErrno = errno;
+        return -1;
+    }
+
+    if (len < mon->bufferOffset) {
+        memmove(mon->buffer, mon->buffer + len, mon->bufferOffset - len);
+        mon->bufferOffset -= len;
+    } else {
+        VIR_FREE(mon->buffer);
+        mon->bufferOffset = mon->bufferLength = 0;
+    }
+    VIR_DEBUG("Process done %d used %d", mon->bufferOffset, len);
+    if (msg && msg->finished)
+        virCondBroadcast(&mon->notify);
+    return len;
+}
+
+
+static int
+qemuMonitorIOWriteWithFD(qemuMonitorPtr mon,
+                         const char *data,
+                         size_t len,
+                         int fd)
+{
+    struct msghdr msg;
+    struct iovec iov[1];
+    int ret;
+    char control[CMSG_SPACE(sizeof(int))];
+    struct cmsghdr *cmsg;
+
+    if (!mon->hasSendFD) {
+        errno = EINVAL;
+        return -1;
+    }
+
+    memset(&msg, 0, sizeof(msg));
+
+    iov[0].iov_base = (void *)data;
+    iov[0].iov_len = len;
+
+    msg.msg_iov = iov;
+    msg.msg_iovlen = 1;
+
+    msg.msg_control = control;
+    msg.msg_controllen = sizeof(control);
+
+    cmsg = CMSG_FIRSTHDR(&msg);
+    cmsg->cmsg_len = CMSG_LEN(sizeof(int));
+    cmsg->cmsg_level = SOL_SOCKET;
+    cmsg->cmsg_type = SCM_RIGHTS;
+    memcpy(CMSG_DATA(cmsg), &fd, sizeof(int));
+
+    do {
+        ret = sendmsg(mon->fd, &msg, 0);
+    } while (ret < 0 && errno == EINTR);
+
+    return ret;
+}
+
+/* Called when the monitor is able to write data */
+static int
+qemuMonitorIOWrite(qemuMonitorPtr mon)
+{
+    int done;
+
+    /* If no active message, or fully transmitted, the no-op */
+    if (!mon->msg || mon->msg->txOffset == mon->msg->txLength)
+        return 0;
+
+    if (mon->msg->txFD == -1)
+        done = write(mon->fd,
+                     mon->msg->txBuffer + mon->msg->txOffset,
+                     mon->msg->txLength - mon->msg->txOffset);
+    else
+        done = qemuMonitorIOWriteWithFD(mon,
+                                        mon->msg->txBuffer + mon->msg->txOffset,
+                                        mon->msg->txLength - mon->msg->txOffset,
+                                        mon->msg->txFD);
+
+    if (done < 0) {
+        if (errno == EAGAIN)
+            return 0;
+
+        mon->lastErrno = errno;
+        return -1;
+    }
+    mon->msg->txOffset += done;
+    return done;
+}
+
+/*
+ * Called when the monitor has incoming data to read
+ *
+ * Returns -1 on error, or number of bytes read
+ */
+static int
+qemuMonitorIORead(qemuMonitorPtr mon)
+{
+    size_t avail = mon->bufferLength - mon->bufferOffset;
+    int ret = 0;
+
+    if (avail < 1024) {
+        if (VIR_REALLOC_N(mon->buffer,
+                          mon->bufferLength + 1024) < 0) {
+            errno = ENOMEM;
+            return -1;
+        }
+        mon->bufferLength += 1024;
+        avail += 1024;
+    }
+
+    /* Read as much as we can get into our buffer,
+       until we block on EAGAIN, or hit EOF */
+    while (avail > 1) {
+        int got;
+        got = read(mon->fd,
+                   mon->buffer + mon->bufferOffset,
+                   avail - 1);
+        if (got < 0) {
+            if (errno == EAGAIN)
+                break;
+            mon->lastErrno = errno;
+            ret = -1;
+            break;
+        }
+        if (got == 0)
+            break;
+
+        ret += got;
+        avail -= got;
+        mon->bufferOffset += got;
+        mon->buffer[mon->bufferOffset] = '\0';
+    }
+
+    VIR_DEBUG("Now read %d bytes of data", mon->bufferOffset);
+
+    return ret;
+}
+
+
+static void qemuMonitorUpdateWatch(qemuMonitorPtr mon)
+{
+    int events =
+        VIR_EVENT_HANDLE_HANGUP |
+        VIR_EVENT_HANDLE_ERROR;
+
+    if (!mon->lastErrno) {
+        events |= VIR_EVENT_HANDLE_READABLE;
+
+        if (mon->msg && mon->msg->txOffset < mon->msg->txLength)
+            events |= VIR_EVENT_HANDLE_WRITABLE;
+    }
+
+    virEventUpdateHandle(mon->watch, events);
 }
 
 
@@ -272,29 +347,89 @@ qemuMonitorIO(int watch, int fd, int events, void *opaque) {
     qemuMonitorPtr mon = opaque;
     int quit = 0, failed = 0;
 
+    qemuMonitorLock(mon);
+    VIR_DEBUG("Monitor %p I/O on watch %d fd %d events %d", mon, watch, fd, events);
+
     if (mon->fd != fd || mon->watch != watch) {
-        VIR_ERROR0(_("event from unexpected fd/watch"));
+        VIR_ERROR("event from unexpected fd %d!=%d / watch %d!=%d", mon->fd, fd, mon->watch, watch);
         failed = 1;
     } else {
-        if (events & (VIR_EVENT_HANDLE_HANGUP | VIR_EVENT_HANDLE_ERROR))
+        if (!mon->lastErrno &&
+            events & VIR_EVENT_HANDLE_WRITABLE) {
+            int done = qemuMonitorIOWrite(mon);
+            if (done < 0)
+                failed = 1;
+            events &= ~VIR_EVENT_HANDLE_WRITABLE;
+        }
+        if (!mon->lastErrno &&
+            events & VIR_EVENT_HANDLE_READABLE) {
+            int got = qemuMonitorIORead(mon);
+            if (got < 0)
+                failed = 1;
+            /* Ignore hangup/error events if we read some data, to
+             * give time for that data to be consumed */
+            if (got > 0) {
+                events = 0;
+
+                if (qemuMonitorIOProcess(mon) < 0)
+                    failed = 1;
+            } else
+                events &= ~VIR_EVENT_HANDLE_READABLE;
+        }
+
+        /* If IO process resulted in an error & we have a message,
+         * then wakeup that waiter */
+        if (mon->lastErrno && mon->msg && !mon->msg->finished) {
+            mon->msg->lastErrno = mon->lastErrno;
+            mon->msg->finished = 1;
+            virCondSignal(&mon->notify);
+        }
+
+        qemuMonitorUpdateWatch(mon);
+
+        if (events & VIR_EVENT_HANDLE_HANGUP) {
+            /* If IO process resulted in EOF & we have a message,
+             * then wakeup that waiter */
+            if (mon->msg && !mon->msg->finished) {
+                mon->msg->finished = 1;
+                mon->msg->lastErrno = EIO;
+                virCondSignal(&mon->notify);
+            }
             quit = 1;
-        else {
+        } else if (events) {
             VIR_ERROR(_("unhandled fd event %d for monitor fd %d"),
                       events, mon->fd);
             failed = 1;
         }
     }
 
-    mon->eofCB(mon, mon->vm, failed);
+    /* We have to unlock to avoid deadlock against command thread,
+     * but is this safe ?  I think it is, because the callback
+     * will try to acquire the virDomainObjPtr mutex next */
+    if (failed || quit) {
+        /* Make sure anyone waiting wakes up now */
+        virCondSignal(&mon->notify);
+        mon->eofcb = 1;
+        qemuMonitorUnlock(mon);
+        VIR_DEBUG("Triggering EOF callback error? %d", failed);
+        mon->eofCB(mon, mon->vm, failed);
+
+        qemuMonitorLock(mon);
+        if (mon->closed) {
+            qemuMonitorUnlock(mon);
+            VIR_DEBUG("Delayed free of monitor %p", mon);
+            qemuMonitorFree(mon, 1);
+        } else {
+            qemuMonitorUnlock(mon);
+        }
+    } else {
+        qemuMonitorUnlock(mon);
+    }
 }
 
 
-
-
-
 qemuMonitorPtr
 qemuMonitorOpen(virDomainObjPtr vm,
-                int reconnect,
                 qemuMonitorEOFNotify eofCB)
 {
     qemuMonitorPtr mon;
@@ -310,20 +445,26 @@ qemuMonitorOpen(virDomainObjPtr vm,
         VIR_FREE(mon);
         return NULL;
     }
+    if (virCondInit(&mon->notify) < 0) {
+        qemudReportError(NULL, NULL, NULL, VIR_ERR_INTERNAL_ERROR, "%s",
+                         _("cannot initialize monitor condition"));
+        virMutexDestroy(&mon->lock);
+        VIR_FREE(mon);
+        return NULL;
+    }
     mon->fd = -1;
     mon->vm = vm;
     mon->eofCB = eofCB;
+    qemuMonitorLock(mon);
 
     switch (vm->monitor_chr->type) {
     case VIR_DOMAIN_CHR_TYPE_UNIX:
         mon->hasSendFD = 1;
-        mon->fd = qemuMonitorOpenUnix(vm, vm->monitor_chr->data.nix.path,
-                                      reconnect);
+        mon->fd = qemuMonitorOpenUnix(vm->monitor_chr->data.nix.path);
         break;
 
     case VIR_DOMAIN_CHR_TYPE_PTY:
-        mon->fd = qemuMonitorOpenPty(vm, vm->monitor_chr->data.file.path,
-                                     reconnect);
+        mon->fd = qemuMonitorOpenPty(vm->monitor_chr->data.file.path);
         break;
 
     default:
@@ -333,8 +474,22 @@ qemuMonitorOpen(virDomainObjPtr vm,
         goto cleanup;
     }
 
+    if (virSetCloseExec(mon->fd) < 0) {
+        qemudReportError(NULL, NULL, NULL, VIR_ERR_INTERNAL_ERROR,
+                         "%s", _("Unable to set monitor close-on-exec flag"));
+        goto cleanup;
+    }
+    if (virSetNonBlock(mon->fd) < 0) {
+        qemudReportError(NULL, NULL, NULL, VIR_ERR_INTERNAL_ERROR,
+                         "%s", _("Unable to put monitor into non-blocking mode"));
+        goto cleanup;
+    }
+
+
     if ((mon->watch = virEventAddHandle(mon->fd,
-                                        VIR_EVENT_HANDLE_HANGUP | VIR_EVENT_HANDLE_ERROR,
+                                        VIR_EVENT_HANDLE_HANGUP |
+                                        VIR_EVENT_HANDLE_ERROR |
+                                        VIR_EVENT_HANDLE_READABLE,
                                         qemuMonitorIO,
                                         mon, NULL)) < 0) {
         qemudReportError(NULL, NULL, NULL, VIR_ERR_INTERNAL_ERROR, "%s",
@@ -342,10 +497,15 @@ qemuMonitorOpen(virDomainObjPtr vm,
         goto cleanup;
     }
 
+    virDomainObjRef(vm);
+
+    VIR_DEBUG("New mon %p fd =%d watch=%d", mon, mon->fd, mon->watch);
+    qemuMonitorUnlock(mon);
 
     return mon;
 
 cleanup:
+    qemuMonitorUnlock(mon);
     qemuMonitorClose(mon);
     return NULL;
 }
@@ -356,13 +516,24 @@ void qemuMonitorClose(qemuMonitorPtr mon)
     if (!mon)
         return;
 
-    if (mon->watch)
-        virEventRemoveHandle(mon->watch);
+    qemuMonitorLock(mon);
+    if (!mon->closed) {
+        if (mon->watch)
+            virEventRemoveHandle(mon->watch);
+        if (mon->fd != -1)
+            close(mon->fd);
+        /* NB: don't reset  fd / watch fields, since active
+         * callback may still want them */
+        mon->closed = 1;
+    }
 
-    if (mon->fd != -1)
-        close(mon->fd);
-    virMutexDestroy(&mon->lock);
-    VIR_FREE(mon);
+    if (mon->eofcb) {
+        VIR_DEBUG("Mark monitor to be deleted %p", mon);
+        qemuMonitorUnlock(mon);
+    } else {
+        VIR_DEBUG("Delete monitor now %p", mon);
+        qemuMonitorFree(mon, 0);
+    }
 }
 
 
@@ -373,71 +544,33 @@ void qemuMonitorRegisterDiskSecretLookup(qemuMonitorPtr mon,
 }
 
 
-int qemuMonitorWrite(qemuMonitorPtr mon,
-                     const char *data,
-                     size_t len)
+int qemuMonitorSend(qemuMonitorPtr mon,
+                    qemuMonitorMessagePtr msg)
 {
-    return safewrite(mon->fd, data, len);
-}
-
-int qemuMonitorWriteWithFD(qemuMonitorPtr mon,
-                           const char *data,
-                           size_t len,
-                           int fd)
-{
-    struct msghdr msg;
-    struct iovec iov[1];
-    ssize_t ret;
-    char control[CMSG_SPACE(sizeof(int))];
-    struct cmsghdr *cmsg;
+    int ret = -1;
 
-    if (!mon->hasSendFD) {
-        errno = EINVAL;
+    if (mon->eofcb) {
+        msg->lastErrno = EIO;
+        qemuMonitorUnlock(mon);
         return -1;
     }
 
-    memset(&msg, 0, sizeof(msg));
-
-    iov[0].iov_base = (void *)data;
-    iov[0].iov_len = len;
-
-    msg.msg_iov = iov;
-    msg.msg_iovlen = 1;
-
-    msg.msg_control = control;
-    msg.msg_controllen = sizeof(control);
-
-    cmsg = CMSG_FIRSTHDR(&msg);
-    cmsg->cmsg_len = CMSG_LEN(sizeof(int));
-    cmsg->cmsg_level = SOL_SOCKET;
-    cmsg->cmsg_type = SCM_RIGHTS;
-    memcpy(CMSG_DATA(cmsg), &fd, sizeof(int));
-
-    do {
-        ret = sendmsg(mon->fd, &msg, 0);
-    } while (ret < 0 && errno == EINTR);
+    mon->msg = msg;
+    qemuMonitorUpdateWatch(mon);
 
-    return ret == len ? 0 : -1;
-}
+    while (!mon->msg->finished) {
+        if (virCondWait(&mon->notify, &mon->lock) < 0)
+            goto cleanup;
+    }
 
-int qemuMonitorRead(qemuMonitorPtr mon,
-                    char *data,
-                    size_t len)
-{
-    return read(mon->fd, data, len);
-}
+    if (mon->lastErrno == 0)
+        ret = 0;
 
-int qemuMonitorWaitForInput(qemuMonitorPtr mon)
-{
-    struct pollfd fd = { mon->fd, POLLIN | POLLERR | POLLHUP, 0 };
+cleanup:
+    mon->msg = NULL;
+    qemuMonitorUpdateWatch(mon);
 
-retry:
-    if (poll(&fd, 1, -1) < 0) {
-        if (errno == EINTR)
-            goto retry;
-        return -1;
-    }
-    return 0;
+    return ret;
 }
 
 
diff --git a/src/qemu/qemu_monitor.h b/src/qemu/qemu_monitor.h
index a8d517c..71688cb 100644
--- a/src/qemu/qemu_monitor.h
+++ b/src/qemu/qemu_monitor.h
@@ -32,6 +32,33 @@
 typedef struct _qemuMonitor qemuMonitor;
 typedef qemuMonitor *qemuMonitorPtr;
 
+typedef struct _qemuMonitorMessage qemuMonitorMessage;
+typedef qemuMonitorMessage *qemuMonitorMessagePtr;
+
+typedef int (*qemuMonitorPasswordHandler)(qemuMonitorPtr mon,
+                                          qemuMonitorMessagePtr msg,
+                                          const char *data,
+                                          size_t len,
+                                          void *opaque);
+
+struct _qemuMonitorMessage {
+    int txFD;
+
+    char *txBuffer;
+    int txOffset;
+    int txLength;
+
+    char *rxBuffer;
+    int rxLength;
+
+    int finished;
+
+    int lastErrno;
+
+    qemuMonitorPasswordHandler passwordHandler;
+    void *passwordOpaque;
+};
+
 typedef void (*qemuMonitorEOFNotify)(qemuMonitorPtr mon,
                                      virDomainObjPtr vm,
                                      int withError);
@@ -49,7 +76,6 @@ typedef int (*qemuMonitorDiskSecretLookup)(qemuMonitorPtr mon,
                                            size_t *secretLen);
 
 qemuMonitorPtr qemuMonitorOpen(virDomainObjPtr vm,
-                               int reconnect,
                                qemuMonitorEOFNotify eofCB);
 
 void qemuMonitorClose(qemuMonitorPtr mon);
@@ -60,21 +86,11 @@ void qemuMonitorUnlock(qemuMonitorPtr mon);
 void qemuMonitorRegisterDiskSecretLookup(qemuMonitorPtr mon,
                                          qemuMonitorDiskSecretLookup secretCB);
 
-int qemuMonitorWrite(qemuMonitorPtr mon,
-                     const char *data,
-                     size_t len);
-
-int qemuMonitorWriteWithFD(qemuMonitorPtr mon,
-                           const char *data,
-                           size_t len,
-                           int fd);
-
-int qemuMonitorRead(qemuMonitorPtr mon,
-                    char *data,
-                    size_t len);
-
-int qemuMonitorWaitForInput(qemuMonitorPtr mon);
+/* This API is for use by the internal Text/JSON monitor impl code only */
+int qemuMonitorSend(qemuMonitorPtr mon,
+                    qemuMonitorMessagePtr msg);
 
+/* XXX same comment about virConnectPtr as above */
 int qemuMonitorGetDiskSecret(qemuMonitorPtr mon,
                              virConnectPtr conn,
                              const char *path,
diff --git a/src/qemu/qemu_monitor_text.c b/src/qemu/qemu_monitor_text.c
index 7ad7f09..db7ff57 100644
--- a/src/qemu/qemu_monitor_text.c
+++ b/src/qemu/qemu_monitor_text.c
@@ -133,181 +133,163 @@ static char *qemuMonitorEscapeShell(const char *in)
     return qemuMonitorEscape(in, 1);
 }
 
-/* Throw away any data available on the monitor
- * This is done before executing a command, in order
- * to allow re-synchronization if something went badly
- * wrong in the past. it also deals with problem of
- * QEMU *sometimes* re-printing its initial greeting
- * when we reconnect to the monitor after restarts.
+/* When connecting to a monitor, QEMU will print a greeting like
+ *
+ * QEMU 0.11.0 monitor - type 'help' for more information
+ *
+ * Don't expect the version number bit to be stable :-)
  */
-static void
-qemuMonitorDiscardPendingData(qemuMonitorPtr mon) {
-    char buf[1024];
-    int ret = 0;
-
-    /* Monitor is non-blocking, so just loop till we
-     * get -1 or 0. Don't bother with detecting
-     * errors, since we'll deal with that better later */
-    do {
-        ret = qemuMonitorRead(mon, buf, sizeof (buf)-1);
-    } while (ret > 0);
-}
+#define GREETING_PREFIX "QEMU "
+#define GREETING_POSTFIX "type 'help' for more information\r\n(qemu) "
+#define BASIC_PROMPT "(qemu) "
+#define PASSWORD_PROMPT "Password:"
+#define DISK_ENCRYPTION_PREFIX "("
+#define DISK_ENCRYPTION_POSTFIX ") is encrypted."
+#define LINE_ENDING "\r\n"
+
+int qemuMonitorTextIOProcess(qemuMonitorPtr mon ATTRIBUTE_UNUSED,
+                             const char *data,
+                             size_t len,
+                             qemuMonitorMessagePtr msg)
+{
+    int used = 0;
 
+    /* Check for & discard greeting */
+    if (STRPREFIX(data, GREETING_PREFIX)) {
+        const char *offset = strstr(data, GREETING_POSTFIX);
 
-static int
-qemuMonitorSend(qemuMonitorPtr mon,
-                const char *cmd,
-                int scm_fd)
-{
-    char *full;
-    size_t len;
-    int ret = -1;
+        /* We see the greeting prefix, but not postfix, so pretend we've
+           not consumed anything. We'll restart when more data arrives. */
+        if (!offset) {
+            VIR_DEBUG0("Partial greeting seen, getting out & waiting for more");
+            return 0;
+        }
 
-    if (virAsprintf(&full, "%s\r", cmd) < 0)
-        return -1;
+        used = offset - data + strlen(GREETING_POSTFIX);
 
-    len = strlen(full);
+        VIR_DEBUG0("Discarded monitor greeting");
+    }
 
-    if (scm_fd == -1)
-        ret = qemuMonitorWrite(mon, full, len);
-    else
-        ret = qemuMonitorWriteWithFD(mon, full, len, scm_fd);
+    /* Don't print raw data in debug because its full of control chars */
+    /*VIR_DEBUG("Process data %d byts of data [%s]", len - used, data + used);*/
+    VIR_DEBUG("Process data %d byts of data", len - used);
 
-    VIR_FREE(full);
-    return ret;
+    /* Look for a non-zero reply followed by prompt */
+    if (msg && !msg->finished) {
+        const char *end;
+
+        /* We might get a prompt for a password */
+        end = strstr(data + used, PASSWORD_PROMPT);
+        if (end) {
+            VIR_DEBUG("Woooo passwowrd [%s]", data + used);
+            if (msg->passwordHandler) {
+                size_t consumed;
+                /* Try and handle the prompt */
+                if (msg->passwordHandler(mon, msg,
+                                         data + used,
+                                         len - used,
+                                         msg->passwordOpaque) < 0)
+                    return -1;
+
+                /* Skip over prompt now */
+                consumed = (end + strlen(PASSWORD_PROMPT))
+                    - (data + used);
+                used += consumed;
+            } else {
+                errno = EACCES;
+                return -1;
+            }
+        }
+
+        /* We use the arrival of BASIC_PROMPT to detect when we've got a
+         * complete reply available from a command */
+        end = strstr(data + used, BASIC_PROMPT);
+        if (end) {
+            /* QEMU echos the command back to us, full of control
+             * character junk that we don't want. Fortunately this
+             * is all terminated by LINE_ENDING, so we can easily
+             * skip over the control character junk */
+            const char *start = strstr(data + used, LINE_ENDING);
+            if (!start)
+                start = data + used;
+            else
+                start += strlen(LINE_ENDING);
+            int want = end - start;
+
+            /* Annoyingly some commands may not have any reply data
+             * at all upon success, but since we've detected the
+             * BASIC_PROMPT we can reasonably reliably cope */
+            if (want) {
+                if (VIR_REALLOC_N(msg->rxBuffer,
+                                  msg->rxLength + want + 1) < 0)
+                    return -1;
+                memcpy(msg->rxBuffer + msg->rxLength, start, want);
+                msg->rxLength += want;
+                msg->rxBuffer[msg->rxLength] = '\0';
+                VIR_DEBUG("Finished %d byte reply [%s]", want, msg->rxBuffer);
+            } else {
+                VIR_DEBUG0("Finished 0 byte reply");
+            }
+            msg->finished = 1;
+            used += end - (data + used);
+            used += strlen(BASIC_PROMPT);
+        }
+    }
+
+    VIR_DEBUG("Total used %d", used);
+    return used;
 }
 
 static int
 qemuMonitorCommandWithHandler(qemuMonitorPtr mon,
                               const char *cmd,
-                              const char *extraPrompt,
-                              qemuMonitorExtraPromptHandler extraHandler,
-                              void *handlerData,
+                              qemuMonitorPasswordHandler passwordHandler,
+                              void *passwordOpaque,
                               int scm_fd,
                               char **reply) {
-    int size = 0;
-    char *buf = NULL;
+    int ret;
+    qemuMonitorMessage msg;
 
-    qemuMonitorDiscardPendingData(mon);
+    *reply = NULL;
 
-    VIR_DEBUG("cmd='%s' extraPrompt='%s'", cmd, NULLSTR(extraPrompt));
-    if (qemuMonitorSend(mon, cmd, scm_fd) < 0)
+    memset(&msg, 0, sizeof msg);
+
+    if (virAsprintf(&msg.txBuffer, "%s\r", cmd) < 0) {
+        virReportOOMError(NULL);
         return -1;
+    }
+    msg.txLength = strlen(msg.txBuffer);
+    msg.txFD = scm_fd;
+    msg.passwordHandler = passwordHandler;
+    msg.passwordOpaque = passwordOpaque;
 
-    *reply = NULL;
+    VIR_DEBUG("Send command '%s' for write with FD %d", cmd, scm_fd);
 
-    for (;;) {
-        /* Read all the data QEMU has sent thus far */
-        for (;;) {
-            char data[1024];
-            int got = qemuMonitorRead(mon, data, sizeof(data));
-
-            if (got == 0)
-                goto error;
-            if (got < 0) {
-                if (errno == EINTR)
-                    continue;
-                if (errno == EAGAIN)
-                    break;
-                goto error;
-            }
-            if (VIR_REALLOC_N(buf, size+got+1) < 0)
-                goto error;
+    ret = qemuMonitorSend(mon, &msg);
 
-            memmove(buf+size, data, got);
-            buf[size+got] = '\0';
-            size += got;
-        }
-
-        /* Look for QEMU prompt to indicate completion */
-        if (buf) {
-            char *foundPrompt;
-            char *tmp;
+    VIR_DEBUG("Receive command reply ret=%d errno=%d %d bytes '%s'",
+              ret, msg.lastErrno, msg.rxLength, msg.rxBuffer);
 
-            if (extraPrompt &&
-                (foundPrompt = strstr(buf, extraPrompt)) != NULL) {
-                char *promptEnd;
+    /* Just in case buffer had some passwords in */
+    memset(msg.txBuffer, 0, msg.txLength);
+    VIR_FREE(msg.txBuffer);
 
-                DEBUG("prompt='%s' handler=%p", extraPrompt, extraHandler);
-                if (extraHandler(mon, buf, foundPrompt, handlerData) < 0)
-                    return -1;
-                /* Discard output so far, necessary to detect whether
-                   extraPrompt appears again.  We don't need the output between
-                   original command and this prompt anyway. */
-                promptEnd = foundPrompt + strlen(extraPrompt);
-                memmove(buf, promptEnd, strlen(promptEnd)+1);
-                size -= promptEnd - buf;
-            } else if ((tmp = strstr(buf, QEMU_CMD_PROMPT)) != NULL) {
-                char *commptr = NULL, *nlptr = NULL;
-                /* Preserve the newline */
-                tmp[1] = '\0';
-
-                /* The monitor doesn't dump clean output after we have written to
-                 * it. Every character we write dumps a bunch of useless stuff,
-                 * so the result looks like "cXcoXcomXcommXcommaXcommanXcommand"
-                 * Try to throw away everything before the first full command
-                 * occurence, and inbetween the command and the newline starting
-                 * the response
-                 */
-                if ((commptr = strstr(buf, cmd))) {
-                    memmove(buf, commptr, strlen(commptr)+1);
-                    if ((nlptr = strchr(buf, '\n')))
-                        memmove(buf+strlen(cmd), nlptr, strlen(nlptr)+1);
-                }
-
-                break;
-            }
+    /* To make life safer for callers, already ensure there's at least an empty string */
+    if (msg.rxBuffer) {
+        *reply = msg.rxBuffer;
+    } else {
+        *reply = strdup("");
+        if (!*reply) {
+            virReportOOMError(NULL);
+            return -1;
         }
-
-        /* Need to wait for more data */
-        if (qemuMonitorWaitForInput(mon) < 0)
-            goto error;
     }
-    *reply = buf;
-    DEBUG("reply='%s'", buf);
-    return 0;
 
- error:
-    VIR_FREE(buf);
-    return -1;
-}
+    if (ret < 0)
+        virReportSystemError(NULL, msg.lastErrno,
+                             _("cannot send monitor command '%s'"), cmd);
 
-struct extraHandlerData
-{
-    const char *reply;
-    bool first;
-};
-
-static int
-qemuMonitorCommandSimpleExtraHandler(qemuMonitorPtr mon,
-                                     const char *buf ATTRIBUTE_UNUSED,
-                                     const char *prompt ATTRIBUTE_UNUSED,
-                                     void *data_)
-{
-    struct extraHandlerData *data = data_;
-
-    if (!data->first)
-        return 0;
-    if (qemuMonitorSend(mon, data->reply, -1) < 0)
-        return -1;
-    data->first = false;
-    return 0;
-}
-
-static int
-qemuMonitorCommandExtra(qemuMonitorPtr mon,
-                         const char *cmd,
-                         const char *extra,
-                         const char *extraPrompt,
-                         int scm_fd,
-                         char **reply) {
-    struct extraHandlerData data;
-
-    data.reply = extra;
-    data.first = true;
-    return qemuMonitorCommandWithHandler(mon, cmd, extraPrompt,
-                                         qemuMonitorCommandSimpleExtraHandler,
-                                         &data, scm_fd, reply);
+    return ret;
 }
 
 static int
@@ -315,7 +297,7 @@ qemuMonitorCommandWithFd(qemuMonitorPtr mon,
                           const char *cmd,
                           int scm_fd,
                           char **reply) {
-    return qemuMonitorCommandExtra(mon, cmd, NULL, NULL, scm_fd, reply);
+    return qemuMonitorCommandWithHandler(mon, cmd, NULL, NULL, scm_fd, reply);
 }
 
 static int
@@ -327,44 +309,74 @@ qemuMonitorCommand(qemuMonitorPtr mon,
 
 
 static int
-qemuMonitorSendVolumePassphrase(qemuMonitorPtr mon,
-                                const char *buf,
-                                const char *prompt,
-                                void *data)
+qemuMonitorSendDiskPassphrase(qemuMonitorPtr mon,
+                              qemuMonitorMessagePtr msg,
+                              const char *data,
+                              size_t len ATTRIBUTE_UNUSED,
+                              void *opaque)
 {
-    virConnectPtr conn = data;
-    char *passphrase = NULL, *path;
-    const char *prompt_path;
-    size_t path_len, passphrase_len = 0;
+    virConnectPtr conn = opaque;
+    char *path;
+    char *passphrase = NULL;
+    size_t passphrase_len = 0;
     int res;
+    const char *pathStart;
+    const char *pathEnd;
 
-    /* The complete prompt looks like this:
-           ide0-hd0 (/path/to/volume) is encrypted.
-           Password:
-       "prompt" starts with ") is encrypted".  Extract /path/to/volume. */
-    for (prompt_path = prompt; prompt_path > buf && prompt_path[-1] != '(';
-         prompt_path--)
-        ;
-    if (prompt_path == buf)
+    /*
+     * For disk passwords:
+     *
+     *    ide0-hd0 (/path/to/volume) is encrypted.
+     *    Password:
+     *
+     */
+    pathStart = strstr(data, DISK_ENCRYPTION_PREFIX);
+    pathEnd = strstr(data, DISK_ENCRYPTION_POSTFIX);
+    if (!pathStart || !pathEnd || pathStart >= pathEnd) {
+        errno = -EINVAL;
         return -1;
-    path_len = prompt - prompt_path;
-    if (VIR_ALLOC_N(path, path_len + 1) < 0)
+    }
+
+    /* Extra the path */
+    pathStart += strlen(DISK_ENCRYPTION_PREFIX);
+    path = strndup(pathStart, pathEnd - pathStart);
+    if (!path) {
+        errno = ENOMEM;
         return -1;
-    memcpy(path, prompt_path, path_len);
-    path[path_len] = '\0';
+    }
 
-    res = qemuMonitorGetDiskSecret(mon, conn, path,
-                                   &passphrase, &passphrase_len);
+    /* Fetch the disk password if possible */
+    res = qemuMonitorGetDiskSecret(mon,
+                                   conn,
+                                   path,
+                                   &passphrase,
+                                   &passphrase_len);
     VIR_FREE(path);
     if (res < 0)
         return -1;
 
-    res = qemuMonitorSend(mon, passphrase, -1);
+    /* Enlarge transmit buffer to allow for the extra data
+     * to be sent back */
+    if (VIR_REALLOC_N(msg->txBuffer,
+                      msg->txLength + passphrase_len + 1 + 1) < 0) {
+        memset(passphrase, 0, passphrase_len);
+        VIR_FREE(passphrase);
+        errno = ENOMEM;
+        return -1;
+    }
+
+    /* Queue the password for sending */
+    memcpy(msg->txBuffer + msg->txLength,
+           passphrase, passphrase_len);
+    msg->txLength += passphrase_len;
+    msg->txBuffer[msg->txLength] = '\r';
+    msg->txLength++;
+    msg->txBuffer[msg->txLength] = '\0';
 
     memset(passphrase, 0, passphrase_len);
     VIR_FREE(passphrase);
 
-    return res;
+    return 0;
 }
 
 int
@@ -372,8 +384,9 @@ qemuMonitorTextStartCPUs(qemuMonitorPtr mon,
                          virConnectPtr conn) {
     char *reply;
 
-    if (qemuMonitorCommandWithHandler(mon, "cont", ") is encrypted.",
-                                      qemuMonitorSendVolumePassphrase, conn,
+    if (qemuMonitorCommandWithHandler(mon, "cont",
+                                      qemuMonitorSendDiskPassphrase,
+                                      conn,
                                       -1, &reply) < 0)
         return -1;
 
@@ -637,15 +650,44 @@ int qemuMonitorTextGetBlockStatsInfo(qemuMonitorPtr mon,
 }
 
 
+static int
+qemuMonitorSendVNCPassphrase(qemuMonitorPtr mon ATTRIBUTE_UNUSED,
+                             qemuMonitorMessagePtr msg,
+                             const char *data ATTRIBUTE_UNUSED,
+                             size_t len ATTRIBUTE_UNUSED,
+                             void *opaque)
+{
+    char *passphrase = opaque;
+    size_t passphrase_len = strlen(passphrase);
+
+    /* Enlarge transmit buffer to allow for the extra data
+     * to be sent back */
+    if (VIR_REALLOC_N(msg->txBuffer,
+                      msg->txLength + passphrase_len + 1 + 1) < 0) {
+        errno = ENOMEM;
+        return -1;
+    }
+
+    /* Queue the password for sending */
+    memcpy(msg->txBuffer + msg->txLength,
+           passphrase, passphrase_len);
+    msg->txLength += passphrase_len;
+    msg->txBuffer[msg->txLength] = '\r';
+    msg->txLength++;
+    msg->txBuffer[msg->txLength] = '\0';
+
+    return 0;
+}
+
 int qemuMonitorTextSetVNCPassword(qemuMonitorPtr mon,
                                   const char *password)
 {
     char *info = NULL;
 
-    if (qemuMonitorCommandExtra(mon, "change vnc password",
-                                password,
-                                QEMU_PASSWD_PROMPT,
-                                -1, &info) < 0) {
+    if (qemuMonitorCommandWithHandler(mon, "change vnc password",
+                                      qemuMonitorSendVNCPassphrase,
+                                      (char *)password,
+                                      -1, &info) < 0) {
         qemudReportError(NULL, NULL, NULL, VIR_ERR_INTERNAL_ERROR,
                          "%s", _("setting VNC password failed"));
         return -1;
diff --git a/src/qemu/qemu_monitor_text.h b/src/qemu/qemu_monitor_text.h
index 35eaf05..6bca07a 100644
--- a/src/qemu/qemu_monitor_text.h
+++ b/src/qemu/qemu_monitor_text.h
@@ -29,6 +29,11 @@
 
 #include "qemu_monitor.h"
 
+int qemuMonitorTextIOProcess(qemuMonitorPtr mon,
+                             const char *data,
+                             size_t len,
+                             qemuMonitorMessagePtr msg);
+
 int qemuMonitorTextStartCPUs(qemuMonitorPtr mon,
                              virConnectPtr conn);
 int qemuMonitorTextStopCPUs(qemuMonitorPtr mon);
-- 
1.6.2.5


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