- Users - libvirt List Archives

[libvirt-users] virConnectClose
by llilulu 23 Aug '17

23 Aug '17

libvirt version: 3.4.0 When invoke virConnectDomainEventRegisteAny register event on a hypervisor connection, before virConnecClose, should I invoke virConnectDomainEventDeregisterAny. If a hypervisor connection close unexpected, call virConnectDomainEventDeregisterAny will return error? Can tell me more detail about event? This libvirt doc not more description. Thanks

1 0

[libvirt-users] Increasing video memory available to Windows
by Alex 14 Aug '17

14 Aug '17

Hi, I have a fedora25 system with a Windows10 host and would like to use it for photoshop. However, it complains the video memory is too low. I'm using the QXL driver and it appears to be limited to 256MB? I've installed the Red Hat QXL driver in Windows. I have 4GB of memory allocated overall, and could allocate more if necessary. How do I increase the available video memory? Photoshop reports that it's detected less than 512MB and isn't operating properly. When I view "Adapter Properties" is reports there is 2047 MB of available graphics memory and 2047 MB Shared System Memory. Attempts to modify with "virsh edit" the vram and other video-related variables for the host have failed. Included below is my qemu XML configuration. Any idea greatly appreciated. <domain type='kvm'> <name>alex-win10</name> <uuid>337f9410-3286-4ef5-a3e8-8271e38ea1e5</uuid> <memory unit='KiB'>4194304</memory> <currentMemory unit='KiB'>4194304</currentMemory> <vcpu placement='static'>2</vcpu> <os> <type arch='x86_64' machine='pc-i440fx-2.4'>hvm</type> </os> <features> <acpi/> <apic/> <hyperv> <relaxed state='on'/> <vapic state='on'/> <spinlocks state='on' retries='8191'/> </hyperv> <vmport state='off'/> </features> <cpu mode='host-model'> <model fallback='allow'/> </cpu> <clock offset='localtime'> <timer name='rtc' tickpolicy='catchup'/> <timer name='pit' tickpolicy='delay'/> <timer name='hpet' present='no'/> <timer name='hypervclock' present='yes'/> </clock> <on_poweroff>destroy</on_poweroff> <on_reboot>restart</on_reboot> <on_crash>restart</on_crash> <pm> <suspend-to-mem enabled='no'/> <suspend-to-disk enabled='no'/> </pm> <devices> <emulator>/usr/bin/qemu-kvm</emulator> <disk type='file' device='disk'> <driver name='qemu' type='qcow2'/> <source file='/var/lib/libvirt/images/alex-win10.qcow2'/> <target dev='vda' bus='virtio'/> <boot order='2'/> <address type='pci' domain='0x0000' bus='0x00' slot='0x07' function='0x0'/> </disk> <disk type='block' device='cdrom'> <driver name='qemu' type='raw'/> <source dev='/dev/sr0'/> <target dev='hdb' bus='ide'/> <readonly/> <boot order='1'/> <address type='drive' controller='0' bus='0' target='0' unit='1'/> </disk> <disk type='file' device='cdrom'> <driver name='qemu' type='raw'/> <target dev='hdc' bus='ide'/> <readonly/> <address type='drive' controller='0' bus='1' target='0' unit='0'/> </disk> <controller type='usb' index='0' model='ich9-ehci1'> <address type='pci' domain='0x0000' bus='0x00' slot='0x06' function='0x7'/> </controller> <controller type='usb' index='0' model='ich9-uhci1'> <master startport='0'/> <address type='pci' domain='0x0000' bus='0x00' slot='0x06' function='0x0' multifunction='on'/> </controller> <controller type='usb' index='0' model='ich9-uhci2'> <master startport='2'/> <address type='pci' domain='0x0000' bus='0x00' slot='0x06' function='0x1'/> </controller> <controller type='usb' index='0' model='ich9-uhci3'> <master startport='4'/> <address type='pci' domain='0x0000' bus='0x00' slot='0x06' function='0x2'/> </controller> <controller type='pci' index='0' model='pci-root'/> <controller type='ide' index='0'> <address type='pci' domain='0x0000' bus='0x00' slot='0x01' function='0x1'/> </controller> <controller type='virtio-serial' index='0'> <address type='pci' domain='0x0000' bus='0x00' slot='0x05' function='0x0'/> </controller> <controller type='scsi' index='0'> <address type='pci' domain='0x0000' bus='0x00' slot='0x09' function='0x0'/> </controller> <interface type='bridge'> <mac address='52:54:00:52:6b:61'/> <source bridge='br0'/> <model type='rtl8139'/> <address type='pci' domain='0x0000' bus='0x00' slot='0x03' function='0x0'/> </interface> <serial type='pty'> <target port='0'/> </serial> <console type='pty'> <target type='serial' port='0'/> </console> <channel type='spicevmc'> <target type='virtio' name='com.redhat.spice.0'/> <address type='virtio-serial' controller='0' bus='0' port='1'/> </channel> <input type='tablet' bus='usb'> <address type='usb' bus='0' port='1'/> </input> <input type='mouse' bus='ps2'/> <input type='keyboard' bus='ps2'/> <graphics type='spice' autoport='yes'> <listen type='address'/> <image compression='off'/> </graphics> <sound model='ich6'> <address type='pci' domain='0x0000' bus='0x00' slot='0x04' function='0x0'/> </sound> <video> <model type='qxl' ram='65536' vram='65536' vgamem='536870912' heads='1' primary='yes'/> <address type='pci' domain='0x0000' bus='0x00' slot='0x02' function='0x0'/> </video> <redirdev bus='usb' type='spicevmc'> <address type='usb' bus='0' port='2'/> </redirdev> <redirdev bus='usb' type='spicevmc'> <address type='usb' bus='0' port='3'/> </redirdev> <memballoon model='virtio'> <address type='pci' domain='0x0000' bus='0x00' slot='0x08' function='0x0'/> </memballoon> </devices> </domain>

2 3

[libvirt-users] virsh blockcommit fails regularily (was: virtual drive performance)
by Dominik Psenner 14 Aug '17

14 Aug '17

Hi, a small update on this. We have migrated the virtualized host to use the virtio drivers and now the drive performance is improved so that we can see a constant transfer rate. Before it used to be the same rate but regularly dropped to a few bytes/sec for a few seconds and then was fast again. However we still observe that the following fails regularily: $ virsh snapshot-create-as --domain domain --name backup --no-metadata --atomic --disk-only --diskspec hda,snapshot=external $ virsh blockcommit domain hda --active --pivot error: failed to pivot job for disk hda error: block copy still active: disk 'hda' not ready for pivot yet Could not merge changes for disk hda of domain. VM may be in invalid state. Then running the following in the morning succeeds and successfully pivotes the snapshot into the base image while the vm is live: $ virsh blockjob domain hda --abort $ virsh blockcommit domain hda --active --pivot Successfully pivoted We run the backup process every day once and it failed on the following days: 2017-07-07 2017-07-20 2017-07-27 2017-08-12 2017-08-14 Looking at this it roughly happens once a week and the guest from then on writes into the snapshot backlog. That snapshot backlog file grows about 8gb every day and thus the issue always needs immediate attention. Any ideas what could cause this issue? Is this a bug (race condition) of `virsh blockcommit` that sometimes fails because it is invoked at the wrong time? Cheers, Dominik 2017-07-07 9:21 GMT+02:00 Dominik Psenner <dpsenner(a)gmail.com>: > Of course the cronjob fails when trying to virsh blockcommit and not when > creating the snapshot, sorry for the noise. > > 2017-07-07 9:15 GMT+02:00 Dominik Psenner <dpsenner(a)gmail.com>: > >> Hi, >> >> different day, same issue.. cronjob runs and fails: >> >> $ virsh snapshot-create-as --domain domain --name backup --no-metadata >> --atomic --disk-only --diskspec hda,snapshot=external >> error: failed to pivot job for disk hda >> error: block copy still active: disk 'hda' not ready for pivot yet >> Could not merge changes for disk hda of domain. VM may be in invalid >> state. >> >> Then running the following in the morning succeeds and successfully >> pivotes the snapshot into the base image while the vm is live: >> >> $ virsh blockjob domain hda --abort >> $ virsh blockcommit domain hda --active --pivot >> Successfully pivoted >> >> This need of manual interventions is becoming a tiring job.. >> >> I someone else seeing the same issue or has an idea what the cause could >> be? >> Can I trust the output and is the base image really up to the latest >> state? >> >> Cheers >> >> 2017-07-02 10:30 GMT+02:00 Dominik Psenner <dpsenner(a)gmail.com>: >> >>> Just a little catch-up. This time I was able to resolve the issue by >>> doing: >>> >>> virsh blockjob domain hda --abort >>> virsh blockcommit domain hda --active --pivot >>> >>> Last time I had to shut down the virtual machine and do this while being >>> offline. >>> >>> Thanks Wang for your valuable input. As far as the memory goes, there's >>> plenty of head room: >>> >>> $ free -h >>> total used free shared buff/cache >>> available >>> Mem: 7.8G 1.8G 407M 9.7M >>> 5.5G 5.5G >>> Swap: 8.0G 619M 7.4G >>> >>> 2017-07-02 10:26 GMT+02:00 王李明 <wanglm(a)certusnet.com.cn>: >>> >>>> mybe this is because you physic host memory is small >>>> >>>> then this will Causing instability of the virtual machine >>>> >>>> But I'm just guessing >>>> >>>> You can try to increase your memory >>>> >>>> >>>> >>>> >>>> >>>> Wang Liming >>>> >>>> >>>> >>>> >>>> >>>> *发件人:* libvirt-users-bounces(a)redhat.com [mailto:libvirt-users-bounces@ >>>> redhat.com] *代表 *Dominik Psenner >>>> *发送时间:* 2017年7月2日 16:22 >>>> *收件人:* libvirt-users(a)redhat.com >>>> *主题:* Re: [libvirt-users] virtual drive performance >>>> >>>> >>>> >>>> Hi again, >>>> >>>> just today an issue I've thought to be resolved popped up again. We >>>> backup the machine by doing: >>>> >>>> virsh snapshot-create-as --domain domain --name backup --no-metadata >>>> --atomic --disk-only --diskspec hda,snapshot=external >>>> >>>> # backup hda.qcow2 >>>> >>>> virsh blockcommit domain hda --active --pivot >>>> >>>> Every now and then this process fails with the following error message: >>>> >>>> error: failed to pivot job for disk hda >>>> error: block copy still active: disk 'hda' not ready for pivot yet >>>> Could not merge changes for disk hda of domain. VM may be in invalid >>>> state. >>>> >>>> I expect live backups are a great asset and should work. Is this a bug >>>> that may relates also to the virtual drive performance issues we observe? >>>> >>>> Cheers >>>> >>>> >>>> >>>> 2017-07-02 10:10 GMT+02:00 Dominik Psenner <dpsenner(a)gmail.com>: >>>> >>>> Hi >>>> >>>> a small update on this. I just migrated the vm from the site to my >>>> laptop and fired it up. The exact same xml configuration (except file paths >>>> and such) starts up and bursts with 50Mb/s to 115Mb/s in the guest. This >>>> allows only one reasonable answer: the cpu on my laptop is somehow better >>>> suited to emulate IO than the CPU built into the host on site. The host >>>> there is a HP proliant microserver gen8 with xeon processor. But the >>>> processor there is also never capped at 100% when the guest copies files. >>>> >>>> I just ran another test by copying a 3Gb large file on the guest. What >>>> I can observe on my computer is that the copy process is not at a constant >>>> rate but rather starts with 90Mb/s, then drops down to 30Mb/s, goes up to >>>> 70Mb/s, drops down to 1Mb/s, goes up to 75Mb/s, drops to 1Mb/s, goes up to >>>> 55Mb/s and the pattern continues. Please note that the drive is still >>>> configured as: >>>> >>>> <driver name='qemu' type='qcow2' cache='none' io='threads'/> >>>> >>>> and I would expect a constant rate that is either high or low since >>>> there is no caching involved and the underlying hard drive is a samsung ssd >>>> evo 850. To have an idea how fast that drive is on my laptop: >>>> >>>> $ dd if=/dev/zero of=testfile bs=1M count=1000 oflag=direct >>>> 1000+0 records in >>>> 1000+0 records out >>>> 1048576000 bytes (1.0 GB, 1000 MiB) copied, 2.47301 s, 424 MB/s >>>> >>>> >>>> >>>> I can further observe that the smaller the saved chunks are the slower >>>> the overall performance is: >>>> >>>> dd if=/dev/zero of=testfile bs=512K count=1000 oflag=direct >>>> 1000+0 records in >>>> 1000+0 records out >>>> 524288000 bytes (524 MB, 500 MiB) copied, 1.34874 s, 389 MB/s >>>> >>>> $ dd if=/dev/zero of=testfile bs=5K count=1000 oflag=direct >>>> 1000+0 records in >>>> 1000+0 records out >>>> 5120000 bytes (5.1 MB, 4.9 MiB) copied, 0.105109 s, 48.7 MB/s >>>> >>>> $ dd if=/dev/zero of=testfile bs=1K count=10000 oflag=direct >>>> 10000+0 records in >>>> 10000+0 records out >>>> 10240000 bytes (10 MB, 9.8 MiB) copied, 0.668438 s, 15.3 MB/s >>>> >>>> $ dd if=/dev/zero of=testfile bs=512 count=20000 oflag=direct >>>> 20000+0 records in >>>> 20000+0 records out >>>> 10240000 bytes (10 MB, 9.8 MiB) copied, 1.10964 s, 9.2 MB/s >>>> >>>> Could this be a limiting factor? Does qemu/kvm do many many writes of >>>> just a few bytes? >>>> >>>> >>>> Ideas, anyone? >>>> >>>> Cheers >>>> >>>> >>>> >>>> 2017-06-21 20:46 GMT+02:00 Dan <srwx4096(a)gmail.com>: >>>> >>>> On Tue, Jun 20, 2017 at 04:24:32PM +0200, Gianluca Cecchi wrote: >>>> > On Tue, Jun 20, 2017 at 3:38 PM, Dominik Psenner <dpsenner(a)gmail.com> >>>> wrote: >>>> > >>>> > > >>>> > > to the following: >>>> > > >>>> > > <disk type='file' device='disk'> >>>> > > <driver name='qemu' type='qcow2' cache='none'/> >>>> > > <source file='/var/data/virtuals/machines/windows-server-2016- >>>> > > x64/image.qcow2'/> >>>> > > <backingStore/> >>>> > > <target dev='hda' bus='scsi'/> >>>> > > <address type='drive' controller='0' bus='0' target='0' unit='0'/> >>>> > > </disk> >>>> > > >>>> > > Do you see any gotchas in this configuration that could prevent the >>>> > > virtualized guest to power on and boot up? >>>> > > >>>> > > >>>> > When I configure like this, from a linux guest point of view I get >>>> this >>>> > Symbios Logic SCSI Controller: >>>> > 00:08.0 SCSI storage controller: LSI Logic / Symbios Logic 53c895a >>>> > >>>> > But htis is true only if you add the SCSI controller too, not only >>>> the disk >>>> > definition. >>>> > In my case >>>> > >>>> > <controller type='scsi' index='0'> >>>> > <address type='pci' domain='0x0000' bus='0x00' slot='0x08' >>>> > function='0x0'/> >>>> > </controller> >>>> > >>>> > Note the slot='0x08' that is reflected into the first field of lspci >>>> inside >>>> > my linux guest. >>>> > So between your controllers you have to add the SCSI one >>>> > >>>> > In my case (Fedora 25 with virt-manager-1.4.1-2.fc25.noarch, >>>> > qemu-kvm-2.7.1-6.fc25.x86_64, libvirt-2.2.1-2.fc25.x86_64) with "Disk >>>> bus" >>>> > set as SCSI in virt-manager, the xml defintiion for the guest is >>>> > automatically updated with the controller if not existent yet. >>>> > And the disk definition sections is like this: >>>> > >>>> > <disk type='file' device='disk'> >>>> > <driver name='qemu' type='qcow2'/> >>>> > <source file='/var/lib/libvirt/images/slaxsmall.qcow2'/> >>>> > <target dev='sda' bus='scsi'/> >>>> > <boot order='1'/> >>>> > <address type='drive' controller='0' bus='0' target='0' >>>> unit='0'/> >>>> > </disk> >>>> > >>>> > So I think you should set dev='sda' and not 'hda' in your xml for it >>>> > >>>> >>>> I am actually very curious to know if that would make a difference. I >>>> don't have a such windows vm images ready to test at present. >>>> >>>> Dan >>>> > I don't kknow if w2016 contains the symbios logic drivers already >>>> > installed, so that a "simple" reboot could imply an automatic >>>> > reconfiguration of the guest.... >>>> > Note also that in Windows when the hw configuration is considered >>>> heavily >>>> > changed, you could be asked to register again (I don't think that the >>>> IDE >>>> > --> SCSI should imply it...) >>>> > >>>> > Gianluca >>>> >>>> > _______________________________________________ >>>> > libvirt-users mailing list >>>> > libvirt-users(a)redhat.com >>>> > https://www.redhat.com/mailman/listinfo/libvirt-users >>>> >>>> >>>> >>>> >>>> -- >>>> >>>> Dominik Psenner >>>> >>>> >>>> >>>> >>>> -- >>>> >>>> Dominik Psenner >>>> >>> >>> >>> >>> -- >>> Dominik Psenner >>> >> >> >> >> -- >> Dominik Psenner >> > > > > -- > Dominik Psenner > -- Dominik Psenner

2 2

[libvirt-users] libvirt: XML-RPC error : Cannot write data: Broken pipe
by netsurfed 10 Aug '17

10 Aug '17

Hi all, I think it's a bug, when call virDomainGetState after "service libvirtd stop", I receive signal SIGPIPE. I want to know how to avoid this problem? And Other interfaces will also encounter this problem？ Below the bt information: Below some information about my hypervisor: root@ubuntu-05:/datapool/zhuohf# virsh -v 3.4.0 root@ubuntu-05:/datapool/zhuohf# qemu-x86_64 -version qemu-x86_64 version 2.9.0 Copyright (c) 2003-2017 Fabrice Bellard and the QEMU Project developers

4 6

[libvirt-users] ANNOUNCE: Oz 0.16.0 release
by Chris Lalancette 09 Aug '17

09 Aug '17

All, I'm pleased to announce release 0.16.0 of Oz. Oz is a program for doing automated installation of guest operating systems with limited input from the user. Release 0.16.0 is a bugfix and feature release for Oz. Some of the highlights between Oz 0.15.0 and 0.16.0 are: * Windows 10 and 2016 support * All timeouts are now configurable * Ubuntu 16.04, 16.10, 17.04 support * Mageia 2, 3, 4, 5 support * Properly find UEFI firmware, which should fix aarch64 installs * Fedora 24, 25, 26 support * FreeBSD 11 support * Replace internal use of pycurl with requests * OpenSUSE Leap support * Timeouts are now based on time, not the number of iterations of the loop * Modern Fedora and RHEL guests will print out a lot more anaconda debugging information to the terminal that oz-install was launched from A tarball and zipfile of this release is available on the Github releases page: https://github.com/clalancette/oz/releases . Packages for Fedora rawhide and 26 have been built in Koji and will eventually make their way to stable. Instructions on how to get and use Oz are available at http://github.com/clalancette/oz/wiki . If you have questions or comments about Oz, please feel free to contact me at clalancette at gmail.com, or open up an issue on the github page: http://github.com/clalancette/oz/issues . Thanks to everyone who contributed to this release through bug reports, patches, and suggestions for improvement. Chris Lalancette

1 0

[libvirt-users] Avoiding console prints by Libvirt Qemu python APIs
by swaroop sp 07 Aug '17

07 Aug '17

Hi, I am trying to check if a domain exists by using the libvirt python API *"lookupbyname()*". If the domain does not exist, it prints an error message on the console saying "*Domain not found*". I need the errors or logs only in syslog. I have tried redirecting stderr and stdout. But, it doesn't have any effect. I have also tried playing around with the libvirt logging settings described in https://libvirt.org/logging.html . No effect again. "stdio_handler" flag in /etc/libvirt/qemu.conf is set to "file" as well. Following is my test code: import os, sysimport libvirt conn = libvirt.open('qemu:///system') # Find the application in the virsh domaintry: sys.stdout = open(os.devnull, "w") sys.stderr = open(os.devnull, "w") dom = conn.lookupByName('abcd') sys.stdout = sys.__stdout__ sys.stderr = sys.__stderr__except Exception as e: syslog.syslog (syslog.LOG_ERR, 'Could not find the domain. ERROR: %s.' % (e)) sys.stdout = sys.__stdout__ sys.stderr = sys.__stderr__ Output: $ python test.py libvirt: QEMU Driver error : Domain not found: no domain with matching name 'abcd' $ Is there a way to avoid this console print? Regards, Swaroop

2 1

[libvirt-users] creating new vm with virt-manager, existing disk failure
by Marko Weber | 8000 03 Aug '17

03 Aug '17

hello, i rsynced a kvm vm from one host to another. i start virt-manager and tell virt-manager to use an existing disk. i set cpu to haswell that is on the host. configure before start is set, and i start "begin installation". I get this output by virt-manager: Unable to complete install: 'internal error: process exited while connecting to monitor: 2017-07-19T09:27:10.861928Z qemu-system-x86_64: can't apply global Haswell-x86_64-cpu.cmt=on: Property '.cmt' not found' Traceback (most recent call last): File "/usr/share/virt-manager/virtManager/asyncjob.py", line 88, in cb_wrapper callback(asyncjob, *args, **kwargs) File "/usr/share/virt-manager/virtManager/create.py", line 2288, in _do_async_install guest.start_install(meter=meter) File "/usr/share/virt-manager/virtinst/guest.py", line 477, in start_install doboot, transient) File "/usr/share/virt-manager/virtinst/guest.py", line 405, in _create_guest self.domain.create() File "/usr/lib64/python2.7/site-packages/libvirt.py", line 1062, in create if ret == -1: raise libvirtError ('virDomainCreate() failed', dom=self) libvirtError: internal error: process exited while connecting to monitor: 2017-07-19T09:27:10.861928Z qemu-system-x86_64: can't apply global Haswell-x86_64-cpu.cmt=on: Property '.cmt' not found try to set it to another cpu and clicking start, i get this: Unable to complete install: 'Domain has already been started!' Traceback (most recent call last): File "/usr/share/virt-manager/virtManager/asyncjob.py", line 88, in cb_wrapper callback(asyncjob, *args, **kwargs) File "/usr/share/virt-manager/virtManager/create.py", line 2288, in _do_async_install guest.start_install(meter=meter) File "/usr/share/virt-manager/virtinst/guest.py", line 455, in start_install raise RuntimeError(_("Domain has already been started!")) RuntimeError: Domain has already been started! how do i stop the already runing vm? virsh list dont show the vm and why do i get the error on haswell? lscpu: Architecture: x86_64 CPU op-mode(s): 32-bit, 64-bit Byte Order: Little Endian CPU(s): 12 On-line CPU(s) list: 0-11 Thread(s) per core: 2 Core(s) per socket: 6 Socket(s): 1 NUMA node(s): 1 Vendor ID: GenuineIntel CPU family: 6 Model: 79 Model name: Intel(R) Xeon(R) CPU E5-1650 v4 @ 3.60GHz Stepping: 1 CPU MHz: 2974.658 CPU max MHz: 4000.0000 CPU min MHz: 1200.0000 BogoMIPS: 7191.87 Virtualization: VT-x L1d cache: 32K L1i cache: 32K L2 cache: 256K L3 cache: 15360K NUMA node0 CPU(s): 0-11 Flags: fpu vme de pse tsc msr pae mce cx8 apic sep mtrr pge mca cmov pat pse36 clflush dts acpi mmx fxsr sse sse2 ss ht tm pbe syscall nx pdpe1gb rdtscp lm constant_tsc arch_perfmon pebs bts rep_good nopl xtopology nonstop_tsc cpuid aperfmperf pni pclmulqdq dtes64 monitor ds_cpl vmx smx est tm2 ssse3 sdbg fma cx16 xtpr pdcm pcid dca sse4_1 sse4_2 x2apic movbe popcnt tsc_deadline_timer aes xsave avx f16c rdrand lahf_lm abm 3dnowprefetch epb cat_l3 cdp_l3 intel_pt tpr_shadow vnmi flexpriority ept vpid fsgsbase tsc_adjust bmi1 hle avx2 smep bmi2 erms invpcid rtm cqm rdt_a rdseed adx smap xsaveopt cqm_llc cqm_occup_llc cqm_mbm_total cqm_mbm_local dtherm ida arat pln pts kind regards marko -- zbfmail - Mittendrin statt nur Datei!

3 3

[libvirt-users] Understanding the contents of virsh dump --memory-only
by Arnabjyoti Kalita 03 Aug '17

03 Aug '17

Hello, I was trying to understand the ELF file generated by the virsh dump (--memory-only) command. I have successfully generated a dump of the VM memory using this command. I specifically am trying to understand the loadable segments of this ELF file. I ran readelf -a <filename> to get the information that I need. Below shows the details of the loadable segments in a much better format :- Loading ELF header #1. offset: 1320 filesize: 655360 memsize: 655360 vaddr: 0 paddr: 0 align: 0 flags: 0 Loading ELF header #2. offset: 656680 filesize: 65536 memsize: 65536 vaddr: 0 paddr: a0000 align: 0 flags: 0 Loading ELF header #3. offset: 722216 filesize: 1072955392 memsize: 1072955392 vaddr: 0 paddr: c0000 align: 0 flags: 0 Loading ELF header #4. offset: 1073677608 filesize: 67108864 memsize: 67108864 vaddr: 0 paddr: f4000000 align: 0 flags: 0 Loading ELF header #5. offset: 1140786472 filesize: 67108864 memsize: 67108864 vaddr: 0 paddr: f8000000 align: 0 flags: 0 Loading ELF header #6. offset: 1207895336 filesize: 8192 memsize: 8192 vaddr: 0 paddr: fc054000 align: 0 flags: 0 Loading ELF header #7. offset: 1207903528 filesize: 262144 memsize: 262144 vaddr: 0 paddr: fffc0000 align: 0 flags: 0 I wanted to know why in this case, is the virtual address (denoted by vaddr) 0 for each of the loadable segments ? Will it be okay if I load the elf file taking the values of physical address (denoted by paddr) into account ? Specifically after loading the file, can I be certain that all of my contents will have been loaded into memory address starting from 0 ? Will the loaded contents be present in the exact location as specified (by paddr) here ? Thanks and Regards. Arnab

2 2

[libvirt-users] Libvirt fails on network disk with ISCSI protocol
by Fred Rolland 02 Aug '17

02 Aug '17

Hi, I am working on oVirt, and I am trying to run a VM with a network disk with ISCSI protocol ( the storage is on a Cinder server). Here is the disk XML I use: <disk device="disk" snapshot="no" type="network"> <address bus="0" controller="0" target="0" type="drive" unit="0" /> <source name="iqn.2010-10.org.openstack:volume-37fea687-040c-4a88-844c-117d1a90e9b2" protocol="iscsi"> <host name="10.35.0.20" port="3260" /> </source> <target bus="scsi" dev="sda" /> <boot order="1" /> <driver cache="none" error_policy="stop" io="threads" name="qemu" type="raw" /> </disk> I get the following error: libvirtError: internal error: process exited while connecting to monitor: 2017-08-02T14:38:58.378430Z qemu-kvm: -drive file=iscsi:// 10.35.0.20:3260/iqn.2010-10.org.openstack%3Avolume-37fea687-040c-4a88-844c-117d1a90e9b2,format=raw,if=none,id=drive-scsi0-0-0-0,cache=none,werror=stop,rerror=stop,aio=threads: Failed to parse URL : iscsi:// 10.35.0.20:3260/iqn.2010-10.org.openstack%3Avolume-37fea687-040c-4a88-844c-117d1a90e9b2 It seems that the ':' character got changed on the way to %3A. Any suggestions on the root cause of this issue? Thanks, Fred Rolland

2 2

[libvirt-users] Regarding KVM-Qemu Migration code
by Aditya Bhardwaj 02 Aug '17

02 Aug '17

Respected Sir, I need to modify kvm-qemu migration code. Please tell me where i can find the code. -- *Thank youWith Regards:Aditya Bhardwaj* *Dept. of CSE * *NITTTR (Ministry of MHRD, Govt. of India)* *Sector-26, **Chandigarh - 160019 INDIA* https://scholar.google.co.in/citations?user=rEHhEnEAAAAJ&hl=en

2 1