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libvirt remote uri format
by Joe Muro 06 Apr '20

06 Apr '20

Hi, I am using python libvirt api to get domain information. When using a uri without specifying the socket path, an error occurs. uri = "qemu+ssh://myuser@some.kvm.host/system" conn = libvirt.open(uri) This results in the following: libvirt: XML-RPC error : internal error: received hangup event on socket If I append the socket path to the URI, it works. e.g. qemu+ssh://myuser@some.kvm.host/system?socket=/var/run/libvirt/libvirt-sock Is this the recommended way to construct an ssh uri? My concern is that the socket path may be different when connecting to different libvirt hosts. remote host is ubuntu 20.04 running libvirtd (libvirt) 6.0.0 under systemd - Joe

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libvirt Source RPMs for CentOS or RHEL?
by FuLong Wang 06 Apr '20

06 Apr '20

Hello Experts, Do we have libvirt source rpms (version above 5.9.0) for CentOS or RHEL? I only find source rpms for fedora in below public link. https://libvirt.org/sources/ -- FuLong Wang fulong.wang(a)cn.ibm.com IBM China Systems Lab, Beijing, China _______________________________________________

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Question about libvirt filter features
by george_boutwell＠yahoo.com 04 Apr '20

04 Apr '20

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can libvirt.so use jemalloc to manage mem ?
by thomas.kuang 02 Apr '20

02 Apr '20

HI, all My daemon exists a libvirt API call: virEventRegisterDefaultImpl(); once I called the virEventRegisterDefaultImpl() ,must be core ,the bt stack is: (gdb) bt #0 free (ptr=0x1) at include/jemalloc/internal/arena.h:652 #1 0x00007f57690a488a in virFree () from /lib64/libvirt.so.0 #2 0x00007f57690c3562 in virResetError () from /lib64/libvirt.so.0 #3 0x00007f57690c49ad in virEventRegisterDefaultImpl () from /lib64/libvirt.so.0 #4 0x00000000004029ad in main (argc=<optimized out>, argv=<optimized out>) at vnf_mgt/vnf_control.c:2920 (gdb) quit the following code copy from libvirt/src/util / int virEventRegisterDefaultImpl(void) { VIR_DEBUG("registering default event implementation"); virResetLastError(); if (virEventPollInit() < 0) { virDispatchError(NULL); return -1; } virEventRegisterImpl(virEventPollAddHandle, virEventPollUpdateHandle, virEventPollRemoveHandle, virEventPollAddTimeout, virEventPollUpdateTimeout, virEventPollRemoveTimeout); return 0; } void virResetLastError(void) { virErrorPtr err = virLastErrorObject(); if (err) virResetError(err); } static virErrorPtr virLastErrorObject(void) { virErrorPtr err; err = virThreadLocalGet(&virLastErr); if (!err) { if (VIR_ALLOC_QUIET(err) < 0) return NULL; if (virThreadLocalSet(&virLastErr, err) < 0) VIR_FREE(err); } return err; } void virResetError(virErrorPtr err) { if (err == NULL) return; VIR_FREE(err->message); VIR_FREE(err->str1); VIR_FREE(err->str2); VIR_FREE(err->str3); memset(err, 0, sizeof(virError)); } # define VIR_FREE(ptr) virFree(1 ? (void *) &(ptr) : (ptr)) void virFree(void *ptrptr) { int save_errno = errno; free(*(void**)ptrptr); *(void**)ptrptr = NULL; errno = save_errno; } when my daemon link with jemalloc must core，but if i use glibc to manage memory ,then it work fine, why ?

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How to perform an in-place upgrade for libvirt
by FuLong Wang 31 Mar '20

31 Mar '20

Hello Experts, Is it possible to perform an in-place upgrade for libvirt. Assume, i have a CentOS 8 installation (choose server with GUI) with libvirt version 4.5.1 and i want to upgrade the libvirt to version 6.0.0, how to implement a perfect replacement for all the related files (libraries, header files, etc)? Does anybody here has the experience for this? Many Thanks! -- FuLong Wang fulong.wang(a)cn.ibm.com IBM China Systems Lab, Beijing, China _______________________________________________

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"configure: error: Unable to find <rpc/rpc.h>" when compiling libvirt 6.0.0 from a release tarball
by FuLong Wang 31 Mar '20

31 Mar '20

Hello Experts, I'm trying to compiling libvirt 6.0.0 on an CentOS 8 env by following the guide here. (https://libvirt.org/compiling.html#compiling) When running the configure command, i encountered the issue of showing "configure: error: Unable to find <rpc/rpc.h>": How can i let the configure command to realize the non-standard header file location of portablexdr library? Could anyone kindly give some clue to resolve this? Thanks in advance! Install portablexdr was successfull. [root@centos8 portablexdr-4.9.1]# make install make install-am make[1]: Entering directory '/root/portablexdr-4.9.1' make[2]: Entering directory '/root/portablexdr-4.9.1' test -z "/usr/local/lib" || /usr/bin/mkdir -p "/usr/local/lib" /bin/sh ./libtool --mode=install /usr/bin/install -c 'libportablexdr.la' '/usr/local/lib/libportablexdr.la' libtool: install: /usr/bin/install -c .libs/libportablexdr.so.0.0.0 /usr/local/lib/libportablexdr.so.0.0.0 libtool: install: (cd /usr/local/lib && { ln -s -f libportablexdr.so.0.0.0 libportablexdr.so.0 || { rm -f libportablexdr.so.0 && ln -s libportablexdr.so.0.0.0 libportablexdr.so.0; }; }) libtool: install: (cd /usr/local/lib && { ln -s -f libportablexdr.so.0.0.0 libportablexdr.so || { rm -f libportablexdr.so && ln -s libportablexdr.so.0.0.0 libportablexdr.so; }; }) libtool: install: /usr/bin/install -c .libs/libportablexdr.lai /usr/local/lib/libportablexdr.la libtool: install: /usr/bin/install -c .libs/libportablexdr.a /usr/local/lib/libportablexdr.a libtool: install: chmod 644 /usr/local/lib/libportablexdr.a libtool: install: ranlib /usr/local/lib/libportablexdr.a libtool: finish: PATH="/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/root/bin:/sbin" ldconfig -n /usr/local/lib ---------------------------------------------------------------------- Libraries have been installed in: /usr/local/lib If you ever happen to want to link against installed libraries in a given directory, LIBDIR, you must either use libtool, and specify the full pathname of the library, or use the `-LLIBDIR' flag during linking and do at least one of the following: - add LIBDIR to the `LD_LIBRARY_PATH' environment variable during execution - add LIBDIR to the `LD_RUN_PATH' environment variable during linking - use the `-Wl,-rpath -Wl,LIBDIR' linker flag - have your system administrator add LIBDIR to `/etc/ld.so.conf' See any operating system documentation about shared libraries for more information, such as the ld(1) and ld.so(8) manual pages. ---------------------------------------------------------------------- test -z "/usr/local/bin" || /usr/bin/mkdir -p "/usr/local/bin" /bin/sh ./libtool --mode=install /usr/bin/install -c 'portable-rpcgen' '/usr/local/bin/portable-rpcgen' libtool: install: /usr/bin/install -c portable-rpcgen /usr/local/bin/portable-rpcgen test -z "/usr/local/include" || /usr/bin/mkdir -p "/usr/local/include" * /bin/sh /root/portablexdr-4.9.1/install-sh -c -m 644 'rpc/rpc.h' '/usr/local/include/rpc/rpc.h'** ** /bin/sh /root/portablexdr-4.9.1/install-sh -c -m 644 'rpc/types.h' '/usr/local/include/rpc/types.h'** ** /bin/sh /root/portablexdr-4.9.1/install-sh -c -m 644 'rpc/xdr.h' '/usr/local/include/rpc/xdr.h'* make[2]: Leaving directory '/root/portablexdr-4.9.1' make[1]: Leaving directory '/root/portablexdr-4.9.1' [root@centos8 portablexdr-4.9.1]# configure command report can't find the <rpc/rpc.h> checking for how to force completely read-only GOT table... -Wl,-z -Wl,relro -Wl,-z -Wl,now checking for how to avoid indirect lib deps... -Wl,--no-copy-dt-needed-entries checking for how to stop undefined symbols at link time... -Wl,-z -Wl,defs checking sys/acl.h usability... no checking sys/acl.h presence... no checking for sys/acl.h... no checking for aa_change_profile in -lapparmor... no checking for pthread_mutexattr_init... yes checking for pthread.h... (cached) yes checking whether pthread_sigmask does anything... yes checking for atomic ops implementation... gcc checking for getxattr in -lattr... no checking for audit_encode_nv_string in -laudit... no checking for pkg-config... /usr/bin/pkg-config checking pkg-config is at least version 0.9.0... yes checking whether rl_completion_quote_character is declared... no checking for BLKID... no checking for capng_updatev in -lcap-ng... no checking for CURL... no checking for DBUS... no checking for DEVMAPPER... no checking for dm_task_run in -ldevmapper... no checking for dlfcn.h... (cached) yes checking for library containing dlopen... -ldl checking for whether to install firewalld libvirt zone... no checking for FUSE... no checking for GLIB... yes checking for GLUSTERFS... no checking for GNUTLS... yes checking for HAL... no checking for LIBISCSI... no checking whether to compile with macvtap support... yes checking whether MACVLAN_MODE_PASSTHRU is declared... yes checking for LIBNL... yes checking for LIBNL_ROUTE... yes checking for LIBPARTED... no checking libpcap pcap-config >= 1.0.0 ... no checking for LIBSSH... no checking for LIBXML... yes checking whether to compile with macvtap support... yes checking whether MACVLAN_MODE_PASSTHRU is declared... (cached) yes checking for NETCF... no checking for gettext... yes checking libintl.h usability... yes checking libintl.h presence... yes checking for libintl.h... yes checking for xgettext... xgettext checking for msgfmt... msgfmt checking for msgmerge... msgmerge checking msgfmt is GNU tool... yes checking for numa_available in -lnuma... no checking for numa_bitmask_isbitset in -lnuma... no checking for OPENWSMAN... no checking for PCIACCESS... no checking for init script type... systemd checking for pkcheck... /usr/bin/pkcheck checking for pthread_mutexattr_init... (cached) yes checking for pthread.h... (cached) yes checking whether pthread_sigmask does anything... (cached) yes checking whether rl_completion_quote_character is declared... (cached) no checking for sanlock_init in -lsanlock_client... no checking for SASL... no checking for fgetfilecon_raw in -lselinux... no checking for SSH2... no checking for UDEV... no checking whether to compile with virtual port support... yes checking for WIRESHARK_DISSECTOR... no *checking for xdrmem_create in -lportablexdr... yes** **checking for xdr_u_int64_t... no** **checking where to find <rpc/rpc.h>... missing** **configure: error: Unable to find <rpc/rpc.h>* [root@centos8 build]# -- FuLong Wang fulong.wang(a)cn.ibm.com IBM China Systems Lab, Beijing, China _______________________________________________

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Masking out the Protected Processor Identification Number
by procmem＠riseup.net 28 Mar '20

28 Mar '20

Hi I was wondering if libvirt/KVM screens out a CPU's or Protected Processor Identification Number? - "PPIN" is a universal hardware serial number etched into the chip in the fab. [1] I am currently allowing full host cpu passthrough to allow guests to use spectre/meltdown mitigations. However as we are a privacy project, we are looking to prevent obvious identity linkers like serial numbers from being read by untrusted environments. Apparentlt Intel has had it for years and its accessible with the mcelog daemon. [1] https://www.phoronix.com/scan.php?page=news_item&px=AMD-PPIN-Processor-ID-L…

1 0

Escape character
by john doe 27 Mar '20

27 Mar '20

Hi, I'm trying to understand how to use the escape character '^]' with the below command: virt-install --name=try06 --graphic none --pxe --network bridge=virbr0 --console pty,target_type=serial "Starting install... Connected to domain try06 Escape character is ^]" When I try to do '^]', it does not escape. The '--console' option makes no difference. In other words, what is the best way to get back to the host from a broken guest installation. I'm remotely connected to this server using SSH and doing '~.' quits the SSH connection. Any help is appriciated. -- John Doe

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Create VM w/ cache=none on tmpfs
by Miguel Duarte de Mora Barroso 27 Mar '20

27 Mar '20

Hi, I've seen that in the past, libvirt couldn't start VMs when the disk image was stored on a file system that doesn't support direct I/O having the 'cache=none' configuration [0]. On the KubeVirt project, we have some storage tests on a particular provider which does just that - try to create / start a VM whose disk is on tmpfs and whose definition features 'cache=none'. The behavior we're seeing is that libvirt throws this warning: ``` Unexpected Warning event received: testvmig4zsxc2f8swkxv22xkhx2vrb4ppqbfdfgfgqh5gq8plqzrv5,853ff3d9-70d4-43c5-b9ff-4d5815ea557d: server error. command SyncVMI failed: "LibvirtError(Code=1, Domain=10, Message='internal error: process exited while connecting to monitor: 2020-03-25T10:09:21.656238Z qemu-kvm: -drive file=/var/run/kubevirt-ephemeral-disks/disk-data/disk0/disk.qcow2,format=qcow2,if=none,id=drive-ua-disk0,cache=none: file system may not support O_DIRECT\n2020-03-25T10:09:21.656391Z qemu-kvm: -drive file=/var/run/kubevirt-ephemeral-disks/disk-data/disk0/disk.qcow2,format=qcow2,if=none,id=drive-ua-disk0,cache=none: Could not open backing file: Could not open '/var/run/kubevirt-private/vmi-disks/disk0/disk.img': Invalid argument')" ``` But actually proceeds, and is able to start the VM - but seems it coerces the cache value to writeThrough. Is this the expected behavior ? e.g. cache = none can't be used when the disk images are on a tmpfs file system ? I know it was, not sure about now (libvirt-5.6.0-7) ... [0] - https://bugs.launchpad.net/nova/+bug/959637

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Question about local migration between containers
by Or Shoval 26 Mar '20

26 Mar '20

Hello On kubevirt project we are using IpV6 Kind cluster, and trying to support migration, but since both of the containers are on the same host we get this error {"component":"virt-launcher","level":"error","msg":"internal error: Attempt to migrate guest to the same host 32323136-3731-4247-3831-303946353338","pos":"virNetClientProgramDispatchError:172","subcomponent":"libvirt","thread":"44", "timestamp":"2020-03-25T10:41:12.123000Z"} Is there a way to work around this please ? it comes of course from https://github.com/libvirt/libvirt/blob/master/src/qemu/qemu_migration_cook… (not sure what version of libvirt i have but it shows the uuid so i guess this is the one) Thanks

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