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1612 discussions

[QEMU-KVM] Centos guest VM freezing
by Akshar Kanak 09 Jan '19

09 Jan '19

Dear team I am running a centos guest VM which freezes for every few days . The qemu-kvm on shows 100% cpu utilization. Ping to the guest might work or may not work .Please can you tell me what approach can i take to debug it . using "virsh dump" I can dump the core of the guest vm but I am not sure how to analyse it . Guest Centos VM : "Linux GUESTCentOS70 3.10.0-123.4.4.el7.x86_64 #1 SMP Fri Jul 25 05:07:12 UTC 2014 x86_64 x86_64 x86_64 GNU/Linux" "CentOS Linux release 7.0.1406 (Core)" 1 vcpu and 2 GB ram Host machine : "Linux HOST 3.10.51-1.el6.elrepo.x86_64 #1 SMP Fri Aug 1 13:14:11 EDT 2014 x86_64 x86_64 x86_64 GNU/Linux" "CentOS release 6.5 (Final)" qemu-kvm package used : qemu-kvm-0.12.1.2-2.415.el6_5.10.x86_64 Thanks and regards Akshar

3 4

xen 4.11
by Christoph 07 Jan '19

07 Jan '19

Hi is there a reason why xen 4.11 isnt released for centos7 (I cant find it on http://mirror.centos.org/centos/7/virt/)? -- ------ Greetz

2 1

xen and libvirt
by Christoph 04 Jan '19

04 Jan '19

Hi Does someone know how it is possible these parameters: e820_host max_grant_frames to set with libvirt xml config? I use them with xl config but I want to change to libvirt config/tools. (with libvirt 4.10 it is possible to start pvh domains) -- ------ Greetz

1 0

Wich tuned profile for Dom0 and DomU
by Christoph 01 Jan '19

01 Jan '19

Hi wich tuned profile are the best for dom0 and domU? There are virt-host and virt-guest profiles for kvm, should I use them? If yes, should I use in domU ever virt-guest or is for example network-throughput profile better for a nfs/samba fs server inside domU better? -- ------ Greetz

3 2

Upgrade to CentOS 7.6 with centos-xen-48 enabled
by Gennardy Smith 23 Dec '18

23 Dec '18

Hi all, I'm unable to upgrade my Dom-0 from CentOS 7.5 to CentOS 7.6 with the sigvirt centos-xen-48 repository enabled and Xen components enabled. It breaks down to down to the fact that 7.6 has a newer version of libvirt included (4.5), while the Xen repository's packages are build against 4.1 version of libvirt. I also tried to enable the libvirt-latest repository, but that does not contain libvirt-daemon-driver-xen package, so dependency resolution is broken again. Is there some workaround for this, or do I just have to wait for the Xen repository to be updated? Has someone resolved this problem? Regards, G. The following is the output of yum when running yum update: [user@dom0 ~]$ sudo yum update [...] --> Finished Dependency Resolution Error: Package: libvirt-daemon-driver-xen-4.1.0-2.xen48.el7.x86_64 (@centos-virt-xen-48) Requires: libvirt.so.0(LIBVIRT_PRIVATE_4.1.0)(64bit) Removing: libvirt-libs-4.1.0-2.xen48.el7.x86_64 (@centos-virt-xen-48) libvirt.so.0(LIBVIRT_PRIVATE_4.1.0)(64bit) Updated By: libvirt-libs-4.5.0-10.el7_6.3.x86_64 (updates) ~libvirt.so.0(LIBVIRT_PRIVATE_4.5.0)(64bit) Error: Package: libvirt-daemon-driver-libxl-4.1.0-2.xen48.el7.x86_64 (@centos-virt-xen-48) Requires: libvirt.so.0(LIBVIRT_PRIVATE_4.1.0)(64bit) Removing: libvirt-libs-4.1.0-2.xen48.el7.x86_64 (@centos-virt-xen-48) libvirt.so.0(LIBVIRT_PRIVATE_4.1.0)(64bit) Updated By: libvirt-libs-4.5.0-10.el7_6.3.x86_64 (updates) ~libvirt.so.0(LIBVIRT_PRIVATE_4.5.0)(64bit) Error: Package: libvirt-daemon-xen-4.1.0-2.xen48.el7.x86_64 (@centos-virt-xen-48) Requires: libvirt-daemon-driver-network = 4.1.0-2.xen48.el7 Removing: libvirt-daemon-driver-network-4.1.0-2.xen48.el7.x86_64 (@centos-virt-xen-48) libvirt-daemon-driver-network = 4.1.0-2.xen48.el7 Updated By: libvirt-daemon-driver-network-4.5.0-10.el7_6.3.x86_64 (updates) libvirt-daemon-driver-network = 4.5.0-10.el7_6.3 Available: libvirt-daemon-driver-network-3.2.1-480.el7.x86_64 (centos-virt-xen-48) libvirt-daemon-driver-network = 3.2.1-480.el7 Available: libvirt-daemon-driver-network-4.5.0-10.el7.x86_64 (base) libvirt-daemon-driver-network = 4.5.0-10.el7 Available: libvirt-daemon-driver-network-4.5.0-10.el7_6.2.x86_64 (updates) libvirt-daemon-driver-network = 4.5.0-10.el7_6.2 Error: Package: libvirt-daemon-driver-xen-4.1.0-2.xen48.el7.x86_64 (@centos-virt-xen-48) Requires: libvirt-daemon = 4.1.0-2.xen48.el7 Removing: libvirt-daemon-4.1.0-2.xen48.el7.x86_64 (@centos-virt-xen-48) libvirt-daemon = 4.1.0-2.xen48.el7 Updated By: libvirt-daemon-4.5.0-10.el7_6.3.x86_64 (updates) libvirt-daemon = 4.5.0-10.el7_6.3 Available: libvirt-daemon-3.2.1-480.el7.x86_64 (centos-virt-xen-48) libvirt-daemon = 3.2.1-480.el7 Available: libvirt-daemon-4.5.0-10.el7.x86_64 (base) libvirt-daemon = 4.5.0-10.el7 Available: libvirt-daemon-4.5.0-10.el7_6.2.x86_64 (updates) libvirt-daemon = 4.5.0-10.el7_6.2 Error: Package: libvirt-daemon-xen-4.1.0-2.xen48.el7.x86_64 (@centos-virt-xen-48) Requires: libvirt-daemon-driver-nwfilter = 4.1.0-2.xen48.el7 Removing: libvirt-daemon-driver-nwfilter-4.1.0-2.xen48.el7.x86_64 (@centos-virt-xen-48) libvirt-daemon-driver-nwfilter = 4.1.0-2.xen48.el7 Updated By: libvirt-daemon-driver-nwfilter-4.5.0-10.el7_6.3.x86_64 (updates) libvirt-daemon-driver-nwfilter = 4.5.0-10.el7_6.3 Available: libvirt-daemon-driver-nwfilter-3.2.1-480.el7.x86_64 (centos-virt-xen-48) libvirt-daemon-driver-nwfilter = 3.2.1-480.el7 Available: libvirt-daemon-driver-nwfilter-4.5.0-10.el7.x86_64 (base) libvirt-daemon-driver-nwfilter = 4.5.0-10.el7 Available: libvirt-daemon-driver-nwfilter-4.5.0-10.el7_6.2.x86_64 (updates) libvirt-daemon-driver-nwfilter = 4.5.0-10.el7_6.2 Error: Package: libvirt-daemon-xen-4.1.0-2.xen48.el7.x86_64 (@centos-virt-xen-48) Requires: libvirt-daemon-driver-storage = 4.1.0-2.xen48.el7 Removing: libvirt-daemon-driver-storage-4.1.0-2.xen48.el7.x86_64 (@centos-virt-xen-48) libvirt-daemon-driver-storage = 4.1.0-2.xen48.el7 Updated By: libvirt-daemon-driver-storage-4.5.0-10.el7_6.3.x86_64 (updates) libvirt-daemon-driver-storage = 4.5.0-10.el7_6.3 Available: libvirt-daemon-driver-storage-3.2.1-480.el7.x86_64 (centos-virt-xen-48) libvirt-daemon-driver-storage = 3.2.1-480.el7 Available: libvirt-daemon-driver-storage-4.5.0-10.el7.x86_64 (base) libvirt-daemon-driver-storage = 4.5.0-10.el7 Available: libvirt-daemon-driver-storage-4.5.0-10.el7_6.2.x86_64 (updates) libvirt-daemon-driver-storage = 4.5.0-10.el7_6.2 Error: Package: libvirt-daemon-xen-4.1.0-2.xen48.el7.x86_64 (@centos-virt-xen-48) Requires: libvirt-daemon-driver-interface = 4.1.0-2.xen48.el7 Removing: libvirt-daemon-driver-interface-4.1.0-2.xen48.el7.x86_64 (@centos-virt-xen-48) libvirt-daemon-driver-interface = 4.1.0-2.xen48.el7 Updated By: libvirt-daemon-driver-interface-4.5.0-10.el7_6.3.x86_64 (updates) libvirt-daemon-driver-interface = 4.5.0-10.el7_6.3 Available: libvirt-daemon-driver-interface-3.2.1-480.el7.x86_64 (centos-virt-xen-48) libvirt-daemon-driver-interface = 3.2.1-480.el7 Available: libvirt-daemon-driver-interface-4.5.0-10.el7.x86_64 (base) libvirt-daemon-driver-interface = 4.5.0-10.el7 Available: libvirt-daemon-driver-interface-4.5.0-10.el7_6.2.x86_64 (updates) libvirt-daemon-driver-interface = 4.5.0-10.el7_6.2 Error: Package: libvirt-daemon-xen-4.1.0-2.xen48.el7.x86_64 (@centos-virt-xen-48) Requires: libvirt-daemon-driver-secret = 4.1.0-2.xen48.el7 Removing: libvirt-daemon-driver-secret-4.1.0-2.xen48.el7.x86_64 (@centos-virt-xen-48) libvirt-daemon-driver-secret = 4.1.0-2.xen48.el7 Updated By: libvirt-daemon-driver-secret-4.5.0-10.el7_6.3.x86_64 (updates) libvirt-daemon-driver-secret = 4.5.0-10.el7_6.3 Available: libvirt-daemon-driver-secret-3.2.1-480.el7.x86_64 (centos-virt-xen-48) libvirt-daemon-driver-secret = 3.2.1-480.el7 Available: libvirt-daemon-driver-secret-4.5.0-10.el7.x86_64 (base) libvirt-daemon-driver-secret = 4.5.0-10.el7 Available: libvirt-daemon-driver-secret-4.5.0-10.el7_6.2.x86_64 (updates) libvirt-daemon-driver-secret = 4.5.0-10.el7_6.2 Error: Package: libvirt-daemon-xen-4.1.0-2.xen48.el7.x86_64 (@centos-virt-xen-48) Requires: libvirt-daemon = 4.1.0-2.xen48.el7 Removing: libvirt-daemon-4.1.0-2.xen48.el7.x86_64 (@centos-virt-xen-48) libvirt-daemon = 4.1.0-2.xen48.el7 Updated By: libvirt-daemon-4.5.0-10.el7_6.3.x86_64 (updates) libvirt-daemon = 4.5.0-10.el7_6.3 Available: libvirt-daemon-3.2.1-480.el7.x86_64 (centos-virt-xen-48) libvirt-daemon = 3.2.1-480.el7 Available: libvirt-daemon-4.5.0-10.el7.x86_64 (base) libvirt-daemon = 4.5.0-10.el7 Available: libvirt-daemon-4.5.0-10.el7_6.2.x86_64 (updates) libvirt-daemon = 4.5.0-10.el7_6.2 Error: Package: libvirt-daemon-xen-4.1.0-2.xen48.el7.x86_64 (@centos-virt-xen-48) Requires: libvirt-daemon-driver-nodedev = 4.1.0-2.xen48.el7 Removing: libvirt-daemon-driver-nodedev-4.1.0-2.xen48.el7.x86_64 (@centos-virt-xen-48) libvirt-daemon-driver-nodedev = 4.1.0-2.xen48.el7 Updated By: libvirt-daemon-driver-nodedev-4.5.0-10.el7_6.3.x86_64 (updates) libvirt-daemon-driver-nodedev = 4.5.0-10.el7_6.3 Available: libvirt-daemon-driver-nodedev-3.2.1-480.el7.x86_64 (centos-virt-xen-48) libvirt-daemon-driver-nodedev = 3.2.1-480.el7 Available: libvirt-daemon-driver-nodedev-4.5.0-10.el7.x86_64 (base) libvirt-daemon-driver-nodedev = 4.5.0-10.el7 Available: libvirt-daemon-driver-nodedev-4.5.0-10.el7_6.2.x86_64 (updates) libvirt-daemon-driver-nodedev = 4.5.0-10.el7_6.2 Error: Package: libvirt-daemon-driver-libxl-4.1.0-2.xen48.el7.x86_64 (@centos-virt-xen-48) Requires: libvirt-daemon = 4.1.0-2.xen48.el7 Removing: libvirt-daemon-4.1.0-2.xen48.el7.x86_64 (@centos-virt-xen-48) libvirt-daemon = 4.1.0-2.xen48.el7 Updated By: libvirt-daemon-4.5.0-10.el7_6.3.x86_64 (updates) libvirt-daemon = 4.5.0-10.el7_6.3 Available: libvirt-daemon-3.2.1-480.el7.x86_64 (centos-virt-xen-48) libvirt-daemon = 3.2.1-480.el7 Available: libvirt-daemon-4.5.0-10.el7.x86_64 (base) libvirt-daemon = 4.5.0-10.el7 Available: libvirt-daemon-4.5.0-10.el7_6.2.x86_64 (updates) libvirt-daemon = 4.5.0-10.el7_6.2 You could try using --skip-broken to work around the problem You could try running: rpm -Va --nofiles --nodigest [user@dom0 ~]$

2 2

Remove viewer for Mac desktop
by Philip Prindeville 30 Sep '18

30 Sep '18

Hi. I have a couple of Mac’s I use (a MBP 15” and a Mac mini), but I have a stack of Linux KVM/Qemu hosts (Centos 7.5) running various VM’s (Ubuntu, Fedora, Win7, Win10, etc). Currently I ssh in with tunneling for X, and let the VNC client draw remotely on XQuartz. It’s reasonably fast on my 1Gb network, but glitchy (hangs, pointer location being wrong, spurious keyboard repeats, refreshing the bottom 1/8 of the screen over and over for no reason, etc). I’ve been told the Wayland+QXL on the guest, and remote Spice over SSH, is the way to go, but I’ve only found one (fairly out-of-date) OS X client (RemoveViewer.app from https://www.spice-space.org/osx-client.html) I’m not sure if the client is using an out of date API that has really poor performance, or I’ve misconfigured things, or what. Can someone in a similar situation post what they’re doing to get satisfactory performance? Especially if it works well on slower (10mb/s) connections when on the road, etc. Thanks, -Philip

1 0

how to update ucode with xen
by Christoph 19 Sep '18

19 Sep '18

Hi can someone say me how to update the µcode of the cpu with xen? I have added the ucode=scan parameter to xen but it does not seem to work... the µcode version of my xeon is really old :/ model name : Intel(R) Xeon(R) CPU E3-1271 v3 @ 3.60GHz microcode : 0x10 -- ------ Greetz

3 5

virsh doesn't support vtpm using XEN?
by Dag Nygren 14 Sep '18

14 Sep '18

Hi again! More TPM + XEN stuff. have look at the following: ================= "xl list -l centos7.0" ============== [ { "domid": 31, "config": { "c_info": { "type": "hvm", "name": "centos7.0", "uuid": "feef6cac-8148-4040-a7cb-ad1f82d8d68a", "run_hotplug_scripts": "True" }, "b_info": { "max_vcpus": 4, "avail_vcpus": [ 0, 1, 2, 3 ], "max_memkb": 4194304, "target_memkb": 4194304, "video_memkb": 8192, "shadow_memkb": 36864, "localtime": "False", "sched_params": { }, "claim_mode": "True", "acpi": "True", "type.hvm": { "pae": "True", "apic": "True", "viridian": "False", "vga": { }, "vnc": { "enable": "True", "listen": "127.0.0.1", "findunused": "True" }, "keymap": "en-us", "sdl": { "enable": "False" }, "spice": { }, "serial": "pty", "boot": "c", "usb": "True", "usbdevice": "tablet", "rdm": { } }, "arch_arm": { } }, "disks": [ { "pdev_path": "/dev/node_b_vg/testimage", "vdev": "hda", "format": "raw", "readwrite": 1, "colo_restore_enable": "False" } ], "nics": [ { "devid": 0, "mac": "00:16:3e:7c:04:3a", "bridge": "bc_br0", "script": "vif-bridge", "nictype": "vif_ioemu" }, { "devid": 1, "mac": "00:16:3e:b4:c1:c6", "bridge": "mgmt_br0", "script": "vif-bridge", "nictype": "vif_ioemu" }, { "devid": 2, "mac": "00:16:3e:3a:78:01", "bridge": "dsip_int_br0", "script": "vif-bridge", "nictype": "vif_ioemu" }, { "devid": 3, "mac": "00:16:3e:fd:44:a6", "bridge": "dsip_ext_br0", "script": "vif-bridge", "nictype": "vif_ioemu" } ], "vtpms": [ { "backend_domname": "vtpm01", "devid": 0, "uuid": "163088d1-1565-49a0-8e0b-64dfc62460bc" } ], "on_reboot": "restart", "on_soft_reset": "soft_reset" } } ] ======================================================= And then: ============== "virsh dumpxml centos7.0" ============== <domain type='xen' id='3'> <name>centos7.0</name> <uuid>feef6cac-8148-4040-a7cb-ad1f82d8d68a</uuid> <memory unit='KiB'>4194304</memory> <currentMemory unit='KiB'>4194304</currentMemory> <vcpu placement='static'>4</vcpu> <os> <type arch='x86_64' machine='xenfv'>hvm</type> <loader type='rom'>/usr/lib64/xen/boot/hvmloader</loader> <boot dev='hd'/> </os> <features> <acpi/> <apic/> <pae/> </features> <clock offset='utc'/> <on_poweroff>destroy</on_poweroff> <on_reboot>restart</on_reboot> <on_crash>destroy</on_crash> <devices> <emulator>/usr/lib64/xen/bin/qemu-system-i386</emulator> <disk type='block' device='disk'> <driver name='phy' type='raw'/> <source dev='/dev/node_b_vg/testimage'/> <target dev='hda' bus='ide'/> <address type='drive' controller='0' bus='0' target='0' unit='0'/> </disk> <controller type='ide' index='0'/> <interface type='bridge'> <mac address='00:16:3e:7c:04:3a'/> <source network='back_channel' bridge='bc_br0'/> <target dev='vif3.0-emu'/> </interface> <interface type='bridge'> <mac address='00:16:3e:b4:c1:c6'/> <source network='management' bridge='mgmt_br0'/> <target dev='vif3.1-emu'/> </interface> <interface type='bridge'> <mac address='00:16:3e:3a:78:01'/> <source network='dsip_int' bridge='dsip_int_br0'/> <target dev='vif3.2-emu'/> </interface> <interface type='bridge'> <mac address='00:16:3e:fd:44:a6'/> <source network='dsip_ext' bridge='dsip_ext_br0'/> <target dev='vif3.3-emu'/> </interface> <serial type='pty'> <source path='/dev/pts/5'/> <target port='0'/> <alias name='serial0'/> </serial> <console type='pty' tty='/dev/pts/5'> <source path='/dev/pts/5'/> <target type='serial' port='0'/> <alias name='serial0'/> </console> <input type='tablet' bus='usb'/> <input type='mouse' bus='ps2'/> <input type='keyboard' bus='ps2'/> <graphics type='vnc' port='5901' autoport='yes' listen='127.0.0.1' keymap='en-us'> <listen type='address' address='127.0.0.1'/> </graphics> <video> <model type='cirrus' vram='8192' heads='1' primary='yes'/> </video> </devices> </domain> ======================================================= A closer look at this will reveal the correct vtpm specification for the native xl command, but it is completely missing from the XML when running virsh. Do we need a more current version of libvirt? Best Dag

1 0

virsh support for TPM?
by Dag Nygren 14 Sep '18

14 Sep '18

Hi again! Succeeded in creating vtpmmgr-stubdom.gz from the source RPM with some shortcuts. ow the next problem seems to be that the libvirt we have will not support the XEN vtpm:s For example: virsh dumpxml <vm-machine> will not contain any info on the vtpm :-( Am I really the first one around with a need for TPM support in the VM:s ?? Best Dag

3 2

We need a patch in the kernel for tpm
by Dag Nygren 13 Sep '18

13 Sep '18

Hi! Think I found a reference to the problem(s) I am seeing with xen-tpmfront in my setup on the net: https://patchwork.kernel.org/patch/9485637/ This patch has not been officially entered and it is not included in the kernel provided in SIG virt either Can we please get it in ? Best Dag

2 4

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