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[libvirt] qemudDomainSetMemory() / qemudDomainSetVcpus() error codes
by Kaitlin Rupert 11 Jun '08

11 Jun '08

Hello, I noticed qemudDomainSetMemory() / qemudDomainSetVcpus() use the VIR_ERR_INTERNAL_ERROR error code when the caller attempts to set the mem/vcpus of an active domain. In this case, returning something like VIR_ERR_NO_SUPPORT would indicate that this is an invalid call - which would distinguish the error from a failure that occurred during the call. Is it possible to use such a return code to indicate what is supported by QEMU/KVM and what isn't? Thanks! -- Kaitlin Rupert IBM Linux Technology Center kaitlin(a)linux.vnet.ibm.com

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[libvirt] [PATCH] Fix storage pool autostart python binding
by Cole Robinson 11 Jun '08

11 Jun '08

The attached patch fixes a few issues with the storage api python bindings. The pool GetAutostart is now generated as intended. Also the libvirtError class now accepts the pool or vol object passed to it when a command fails. Thanks, Cole diff --git a/python/libvir.py b/python/libvir.py index 3a38898..784152a 100644 --- a/python/libvir.py +++ b/python/libvir.py @@ -15,13 +15,17 @@ import types # The root of all libvirt errors. class libvirtError(Exception): - def __init__(self, msg, conn=None, dom=None, net=None): + def __init__(self, msg, conn=None, dom=None, net=None, pool=None, vol=None): Exception.__init__(self, msg) if dom is not None: conn = dom._conn elif net is not None: conn = net._conn + elif pool is not None: + conn = pool._conn + elif vol is not None: + conn = vol._conn if conn is None: self.err = virGetLastError() diff --git a/python/libvirt-python-api.xml b/python/libvirt-python-api.xml index da643d7..f3b82fc 100644 --- a/python/libvirt-python-api.xml +++ b/python/libvirt-python-api.xml @@ -83,6 +83,11 @@ <return type='int' info='the autostart flag, or None in case of error'/> <arg name='domain' type='virDomainPtr' info='a network object'/> </function> + <function name='virStoragePoolGetAutostart' file='python'> + <info>Extract the autostart flag for a storage pool</info> + <return type='int' info='the autostart flag, or None in case of error'/> + <arg name='pool' type='virStoragePoolPtr' info='a storage pool object'/> + </function> <function name='virDomainBlockStats' file='python'> <info>Extracts block device statistics for a domain</info> <return type='virDomainBlockStats' info='a tuple of statistics'/>

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[libvirt] Release?
by Richard W.M. Jones 10 Jun '08

10 Jun '08

I've just had a chat with Daniel about whether it's time for a new release of libvirt. My own primary focus is getting the virDomain*Peek APIs into a released version so I can use them from Fedora. libvirt 0.4.2 was released on 8th Apr 2008. I just scanned the changelog and there's a pretty long list of new features: - Support for serial and parallel devices in Xend - Network interface model in QEMU network devs - SetVcpus, DomainGetMaxVcpus, VCPU pinning in QEMU - Disk "bus"es - Support for Xenner - Deprecate conn/dom/net fields in virterror - HTML documentation completely restructured - MinGW fixes - Memory leaks plugged - Added HACKING file and lots of work on unifying syntax and methods used in the code base to a single standard - Lots of LXR changes - virDomain*Peek APIs - and of course many bug fixes So is it time for a release? Rich. -- Richard Jones, Emerging Technologies, Red Hat http://et.redhat.com/~rjones virt-top is 'top' for virtual machines. Tiny program with many powerful monitoring features, net stats, disk stats, logging, etc. http://et.redhat.com/~rjones/virt-top

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[libvirt] [PATCH] Fix enabling storage driver
by Cole Robinson 10 Jun '08

10 Jun '08

As of a couple weeks ago, the storage driver is only registered if the WITH_LIBVIRTD macro is defined. The configure option --with-libvirtd actually wasn't defining this macro. The attached patch fixes this. Thanks, Cole diff --git a/configure.in b/configure.in index 47633b0..64c6013 100644 --- a/configure.in +++ b/configure.in @@ -257,6 +257,10 @@ if test "$with_remote" = "yes" ; then LIBVIRT_FEATURES="$LIBVIRT_FEATURES -DWITH_REMOTE" fi +if test "$with_libvirtd" = "yes" ; then + LIBVIRT_FEATURES="$LIBVIRT_FEATURES -DWITH_LIBVIRTD" +fi + if test "$with_xen" = "yes" ; then dnl search for the Xen store library AC_SEARCH_LIBS(xs_read, [xenstore],

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[libvirt] [PATCH] Fix UUIDString for python bindings
by Cole Robinson 10 Jun '08

10 Jun '08

The attached patch fixes a few issues in the python bindings. First, UUIDString has, to my understanding, never worked. It expected to be passed a buffer to fill with the uuid, which through my tests isn't realistically doable from python. I added custom bindings to fix this, and it now works as expected, taking no arguments and returning a string. UUID for a storage pool wasn't being generated with its custom function, so it too was broken. This is also fixed. I also removed some stale entries for virStorageVol UUID functions from generator.py which were probably just carried along from an old version of the storage api patches (storage volumes don't use UUID). Thanks, Cole diff --git a/python/generator.py b/python/generator.py index 68a7203..1514c02 100755 --- a/python/generator.py +++ b/python/generator.py @@ -291,8 +291,10 @@ skip_impl = ( 'virDomainGetInfo', 'virNodeGetInfo', 'virDomainGetUUID', + 'virDomainGetUUIDString', 'virDomainLookupByUUID', 'virNetworkGetUUID', + 'virNetworkGetUUIDString', 'virNetworkLookupByUUID', 'virDomainGetAutostart', 'virNetworkGetAutostart', @@ -305,9 +307,8 @@ skip_impl = ( 'virDomainGetVcpus', 'virDomainPinVcpu', 'virStoragePoolGetUUID', + 'virStoragePoolGetUUIDString', 'virStoragePoolLookupByUUID', - 'virStorageVolGetUUID', - 'virStorageVolLookupByUUID', 'virStoragePoolGetInfo', 'virStorageVolGetInfo', 'virStoragePoolGetAutostart', diff --git a/python/libvir.c b/python/libvir.c index 8258cc2..9cc0c81 100644 --- a/python/libvir.c +++ b/python/libvir.c @@ -864,6 +864,33 @@ libvirt_virDomainGetUUID(PyObject *self ATTRIBUTE_UNUSED, PyObject *args) { } static PyObject * +libvirt_virDomainGetUUIDString(PyObject *self ATTRIBUTE_UNUSED, + PyObject *args) { + PyObject *py_retval; + char uuidstr[VIR_UUID_STRING_BUFLEN]; + virDomainPtr dom; + PyObject *pyobj_dom; + int c_retval; + + if (!PyArg_ParseTuple(args, (char *)"O:virDomainGetUUIDString", + &pyobj_dom)) + return(NULL); + dom = (virDomainPtr) PyvirDomain_Get(pyobj_dom); + + if (dom == NULL) + return VIR_PY_NONE; + LIBVIRT_BEGIN_ALLOW_THREADS; + c_retval = virDomainGetUUIDString(dom, &uuidstr[0]); + LIBVIRT_END_ALLOW_THREADS; + + if (c_retval < 0) + return VIR_PY_NONE; + + py_retval = PyString_FromString((char *) &uuidstr[0]); + return(py_retval); +} + +static PyObject * libvirt_virDomainLookupByUUID(PyObject *self ATTRIBUTE_UNUSED, PyObject *args) { PyObject *py_retval; virDomainPtr c_retval; @@ -997,6 +1024,33 @@ libvirt_virNetworkGetUUID(PyObject *self ATTRIBUTE_UNUSED, PyObject *args) { } static PyObject * +libvirt_virNetworkGetUUIDString(PyObject *self ATTRIBUTE_UNUSED, + PyObject *args) { + PyObject *py_retval; + char uuidstr[VIR_UUID_STRING_BUFLEN]; + virNetworkPtr net; + PyObject *pyobj_net; + int c_retval; + + if (!PyArg_ParseTuple(args, (char *)"O:virNetworkGetUUIDString", + &pyobj_net)) + return(NULL); + net = (virNetworkPtr) PyvirNetwork_Get(pyobj_net); + + if (net == NULL) + return VIR_PY_NONE; + LIBVIRT_BEGIN_ALLOW_THREADS; + c_retval = virNetworkGetUUIDString(net, &uuidstr[0]); + LIBVIRT_END_ALLOW_THREADS; + + if (c_retval < 0) + return VIR_PY_NONE; + + py_retval = PyString_FromString((char *) &uuidstr[0]); + return(py_retval); +} + +static PyObject * libvirt_virNetworkLookupByUUID(PyObject *self ATTRIBUTE_UNUSED, PyObject *args) { PyObject *py_retval; virNetworkPtr c_retval; @@ -1363,6 +1417,31 @@ libvirt_virStoragePoolGetUUID(PyObject *self ATTRIBUTE_UNUSED, PyObject *args) { return(py_retval); } +static PyObject * +libvirt_virStoragePoolGetUUIDString(PyObject *self ATTRIBUTE_UNUSED, + PyObject *args) { + PyObject *py_retval; + char uuidstr[VIR_UUID_STRING_BUFLEN]; + virStoragePoolPtr pool; + PyObject *pyobj_pool; + int c_retval; + + if (!PyArg_ParseTuple(args, (char *)"O:virStoragePoolGetUUIDString", &pyobj_pool)) + return(NULL); + pool = (virStoragePoolPtr) PyvirStoragePool_Get(pyobj_pool); + + if (pool == NULL) + return VIR_PY_NONE; + LIBVIRT_BEGIN_ALLOW_THREADS; + c_retval = virStoragePoolGetUUIDString(pool, &uuidstr[0]); + LIBVIRT_END_ALLOW_THREADS; + + if (c_retval < 0) + return VIR_PY_NONE; + + py_retval = PyString_FromString((char *) &uuidstr[0]); + return(py_retval); +} static PyObject * libvirt_virStoragePoolLookupByUUID(PyObject *self ATTRIBUTE_UNUSED, PyObject *args) { @@ -1403,6 +1482,7 @@ static PyMethodDef libvirtMethods[] = { {(char *) "virDomainGetInfo", libvirt_virDomainGetInfo, METH_VARARGS, NULL}, {(char *) "virNodeGetInfo", libvirt_virNodeGetInfo, METH_VARARGS, NULL}, {(char *) "virDomainGetUUID", libvirt_virDomainGetUUID, METH_VARARGS, NULL}, + {(char *) "virDomainGetUUIDString", libvirt_virDomainGetUUIDString, METH_VARARGS, NULL}, {(char *) "virDomainLookupByUUID", libvirt_virDomainLookupByUUID, METH_VARARGS, NULL}, {(char *) "virRegisterErrorHandler", libvirt_virRegisterErrorHandler, METH_VARARGS, NULL}, {(char *) "virGetLastError", libvirt_virGetLastError, METH_VARARGS, NULL}, @@ -1410,6 +1490,7 @@ static PyMethodDef libvirtMethods[] = { {(char *) "virConnectListNetworks", libvirt_virConnectListNetworks, METH_VARARGS, NULL}, {(char *) "virConnectListDefinedNetworks", libvirt_virConnectListDefinedNetworks, METH_VARARGS, NULL}, {(char *) "virNetworkGetUUID", libvirt_virNetworkGetUUID, METH_VARARGS, NULL}, + {(char *) "virNetworkGetUUIDString", libvirt_virNetworkGetUUIDString, METH_VARARGS, NULL}, {(char *) "virNetworkLookupByUUID", libvirt_virNetworkLookupByUUID, METH_VARARGS, NULL}, {(char *) "virDomainGetAutostart", libvirt_virDomainGetAutostart, METH_VARARGS, NULL}, {(char *) "virNetworkGetAutostart", libvirt_virNetworkGetAutostart, METH_VARARGS, NULL}, @@ -1428,6 +1509,7 @@ static PyMethodDef libvirtMethods[] = { {(char *) "virStoragePoolGetInfo", libvirt_virStoragePoolGetInfo, METH_VARARGS, NULL}, {(char *) "virStorageVolGetInfo", libvirt_virStorageVolGetInfo, METH_VARARGS, NULL}, {(char *) "virStoragePoolGetUUID", libvirt_virStoragePoolGetUUID, METH_VARARGS, NULL}, + {(char *) "virStoragePoolGetUUIDString", libvirt_virStoragePoolGetUUIDString, METH_VARARGS, NULL}, {(char *) "virStoragePoolLookupByUUID", libvirt_virStoragePoolLookupByUUID, METH_VARARGS, NULL}, {NULL, NULL, 0, NULL} }; diff --git a/python/libvirt-python-api.xml b/python/libvirt-python-api.xml index f415c50..da643d7 100644 --- a/python/libvirt-python-api.xml +++ b/python/libvirt-python-api.xml @@ -48,11 +48,31 @@ <return type='char *' info='the 16 bytes string or None in case of error'/> <arg name='domain' type='virDomainPtr' info='a domain object'/> </function> + <function name='virDomainGetUUIDString' file='python'> + <info>Fetch globally unique ID of the domain as a string.</info> + <return type='char *' info='the UUID string or None in case of error'/> + <arg name='pool' type='virDomainPtr' info='a domain object'/> + </function> <function name='virNetworkGetUUID' file='python'> <info>Extract the UUID unique Identifier of a network.</info> <return type='char *' info='the 16 bytes string or None in case of error'/> <arg name='domain' type='virNetworkPtr' info='a network object'/> </function> + <function name='virNetworkGetUUIDString' file='python'> + <info>Fetch globally unique ID of the network as a string.</info> + <return type='char *' info='the UUID string or None in case of error'/> + <arg name='net' type='virNetworkPtr' info='a network object'/> + </function> + <function name='virStoragePoolGetUUID' file='python'> + <info>Extract the UUID unique Identifier of a storage pool.</info> + <return type='char *' info='the 16 bytes string or None in case of error'/> + <arg name='pool' type='virStoragePoolPtr' info='a storage pool object'/> + </function> + <function name='virStoragePoolGetUUIDString' file='python'> + <info>Fetch globally unique ID of the storage pool as a string.</info> + <return type='char *' info='the UUID string or None in case of error'/> + <arg name='pool' type='virStoragePoolPtr' info='a storage pool object'/> + </function> <function name='virNetworkGetAutostart' file='python'> <info>Extract the autostart flag for a network.</info> <return type='int' info='the autostart flag, or None in case of error'/>

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[libvirt] [PATCH] virDomainMemoryPeek - peek into guest memory
by Richard W.M. Jones 10 Jun '08

10 Jun '08

This patch implements virDomainMemoryPeek, which allows callers to peek into guest (virtual) memory. Currently the patch contains a QEMU driver and remote support. There's also a big comment in the source describing how to do Xen. Obviously the use case for this is virt-mem: http://et.redhat.com/~rjones/virt-mem/ Rich. -- Richard Jones, Emerging Technologies, Red Hat http://et.redhat.com/~rjones Read my OCaml programming blog: http://camltastic.blogspot.com/ Fedora now supports 59 OCaml packages (the OPEN alternative to F#) http://cocan.org/getting_started_with_ocaml_on_red_hat_and_fedora

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[libvirt] [PATCH] lxc: new tty for container
by Dave Leskovec 10 Jun '08

10 Jun '08

The lxc driver xml parser treats the console element as input when it should be output only. This obviously causes problems when anything other than /dev/ptmx is specified or when a container is shutdown and then restarted without redefining it (so that the console field is reset). This patch treats the console element as output only and always creates a new device when starting a container. Also fixed up a string overflow when storing the device name. Thanks! -- Best Regards, Dave Leskovec IBM Linux Technology Center Open Virtualization

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[libvirt] what is the net model syntax
by Farkas Levente 09 Jun '08

09 Jun '08

hi, how can i define the emulated network card model in libvirt's xml config files? i can't find it in the docs. thanks. -- Levente "Si vis pacem para bellum!"

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[Libvir] Reopening the old discussion about virDomainBlockPeek
by Richard W.M. Jones 09 Jun '08

09 Jun '08

Virt-df[1] has now gained the ability to fully parse LVM2 partitions, thus: # virt-df -c qemu:///system -h Filesystem Size Used Available Type rhel51x32kvm:hda1 96.8 MiB 14.6 MiB 82.2 MiB Linux ext2/3 rhel51x32kvm:VolGroup00/LogVol00 6.4 GiB 3.6 GiB 2.8 GiB Linux ext2/3 rhel51x32kvm:VolGroup00/LogVol01 992.0 MiB Linux swap However it still has to do it by opening the local partitions / files, which means it isn't using a "proper" part of libvirt and more importantly it cannot run remotely. I'd like to find out whether the time has come for us to look again at a virDomainBlockPeek call for libvirt. Here is the original thread plus patch from 7 months ago: http://www.redhat.com/archives/libvir-list/2007-October/thread.html#00089 (I've attached an updated patch against current CVS). I appreciate that some cases might not be simple (iSCSI?), but the same argument applies to block device statistics too, and we make those available where possible. I think a best-effort call allowing callers to peek into the block devices of guests would be very useful. Rich. [1] http://hg.et.redhat.com/applications/virt/applications/virt-df--devel -- Richard Jones, Emerging Technologies, Red Hat http://et.redhat.com/~rjones virt-top is 'top' for virtual machines. Tiny program with many powerful monitoring features, net stats, disk stats, logging, etc. http://et.redhat.com/~rjones/virt-top

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[libvirt] Routing
by Dave Walker 09 Jun '08

09 Jun '08

Hi, I'm trying to set up routed networking using libvirt0.4.2, but not having much joy, I cannot ping from either the host OS, or elsewhere on the network (or inverse from the guest OS). I would really appreciate some assistance as I haven't been able to find many routing examples. I'm using the example provided[0], which does create virbr1. If I can provide any further information, please let me know. $ ifconfig = http://pastebin.com/f69bf71bf $ route = http://pastebin.com/f69c73b03 $ cat /etc/libvirt/qemu/networks/default.xml = http://pastebin.com/f3fee05fb $ cat /etc/libvirt/qemu/ubuntu.xml = http://pastebin.com/f477c53a6 [0] http://libvirt.org/formatnetwork.html#examplesRoute Kind Regards, Dave Walker

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