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Cannot turn iommu on inside guest
by Mauricio Tavares 19 Feb '20

19 Feb '20

So I want to turn iommu support on in a guest ( <type arch='x86_64' machine='pc-q35-4.1'>hvm</type>). Per [1] I tried to add to devices either <devices> <iommu model='intel'> <driver intremap='on'/> </iommu> </devices> or just a simpler <devices> <iommu model='intel /'> </devices> However, when I try to boot it, it crashes with the following error message (stolen from /var/log/libvirt/qemu/testkvm.log): 2020-02-11T05:13:27.278707Z qemu-system-x86_64: We need to set caching-mode=on for intel-iommu to enable device assignment with IOMMU protection. 2020-02-11 05:13:27.577+0000: shutting down, reason=crashed that sounds like it wants me to do something like qemu-system-x86_64 [...] -device intel-iommu,intremap=on,caching-mode=on[2] using virsh. But <devices> <iommu model='intel'> <driver intremap='on' caching-mode='on '/> </iommu> </devices> is not only not mentioned in [1] but also fails [root@testbox tests]# virsh edit testkvm error: XML document failed to validate against schema: Unable to validate doc against /usr/share/libvirt/schemas/domain.rng Extra element devices in interleave Element domain failed to validate content Failed. Try again? [y,n,i,f,?]: Can anyone show me what I am missing here? [1] https://libvirt.org/formatdomain.html#elementsIommu [2] https://wiki.qemu.org/Features/VT-d#Command_Line_Example_2

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clustered lvm volume activation
by Timm Wunderlich 19 Feb '20

19 Feb '20

dear all, i have a problem with clustered lvm storage and the "logical" storage driver, perhaps someone has a suggestion. i have a clustered lvm (lvmlockd, not clvm) with 4 hosts running. when i start the storage on a host it activates all volumes in the whole volume group. then i cannot start the storage on other hosts because all volumes are already activated on one host. if i then deactivate all volumes in the started pool i can start the pool on other hosts. but then i have to manually activate the volume if i want to start the domain. it would be great if the logical pool driver would only activate the volume of a domain at domain start and not on pool start. does anybody have a workaround for this or any suggestions for me? do you think i should open an issue on it? Regards, Timm -- __________________________________________ Timm Wunderlich Systemadministrator Universität Siegen, Fakultät III Lehrstuhl für Wirtschaftsinformatik und Neue Medien Kohlbett Str. 15, 57068 Siegen Tel: +49 271-740 3382 timm.wunderlich(a)uni-siegen.de www.wineme.uni-siegen.de -----BEGIN PGP PUBLIC KEY BLOCK----- mQINBFtFv/cBEAC8s0N+dShoUlPAjN089DyWGuWuZHGJcHyU81GmSI5lYLdOqvfN NAZzZcUckuxlzqvT/Z18IbXMlzxkzxgM9Cf+x3TYdkEFW2Nm8NqdPAdW5Y9is8xg 3FcWjvSSj52VwkM8WvpR40X4c5amXxfIU0YfkGW49xMHNrvd+4keniNrsOhYR2Ej EHTEGfHz7jT0YiO2kytfpQqTFKGgeAsFzlfXJuqB4b6FVBrQ+EJnvsDfhpwVDpli XY4Kn9PeDNXNW85f2z9EplvYyOh0LVBFIXKle/k2v+2YLkthj0xAwYdxswytwzM8 YnRnNWAN0s+e1XKqyBR7ND8HN5pnETWAYfPNrB2PWJk8RcwK8Sh/CBlp43w0AZ0F WBh0YtrVDsi4EYrebkvYL3VJqsi2g9KF4QkBSghAUbJdkMGDvrMVPyPMAs9ISDTN rQaxJp95Bx+3kdj3XeKbkNsiy+bU1mbZDdbpTPH0ElGUV7Jcvfgf3WASg/cOzFpT OvWrX393gcE/eyTj8t11yPAbrf6vQBROkHODE9igxkJgBcHF7hjzqYFIARXcAZ5r iZwvhLItT9Oxh7B8neXOomcVc+YVI84qRM732KW8xI41mt26KkpBqPf0SYHXTP9/ cwwBhL3M5Ilp86uOPFcE7MBV3cEvU+KQCKofnnYaglrvokEmp7JOS7xLeQARAQAB tC9UaW1tIFd1bmRlcmxpY2ggPHRpbW0ud3VuZGVybGljaEB1bmktc2llZ2VuLmRl PokCVAQTAQgAPhYhBD/b8miy3HmpxCESukgeFEZUtL7iBQJbRb/3AhsjBQkJZgGA BQsJCAcCBhUICQoLAgQWAgMBAh4BAheAAAoJEEgeFEZUtL7i1rsQAJSr7kiVO4nq nX1YudhRuXI4iOLjoQgt4bfrBqr9Xaj4RXtWJUqqw8/KytRu/C4Lhijll12V0gMa nia5B8z6uRarloTZuiO8pEX9QpbGqzhS3txWHymXVjINKWeZg3+tQHjuJOLD/Hv2 pV5xsWltB+vuy4HyrNgus/seU3wi5DkwQGHc1ncNwX1Px+wY60DnizCyp6if1HwX 9yq91tXUszPPKHIDMUZWljfDxkrVyn5XbJubNPNeFXfSV1THJixp0jaeasdEdVkE FQX4A42Tch8LIHY0Rs7JoczEkytVLArvDiQrPbb1n+YFcNpGqdREq1VQSgVkU6NH YL2uPYNNxaB6LwNQpg7Sg5k4+Kxb9LW0YAObtazXVAN0xHb2mcSq5JE1XZP2LcpE +CEr0TBKgkYUEskWOa23tP/TaZlqv6ZS/XOHiTphynirrtxwUz7cYr8LCcIItz1t 3PPWU6NJ68T6nc6FzQifaIyR5GQWWI8qlUvL7FG5HghJp2cx4yC3IKaIoXbyd6/W gJGW5R3pmoPnvTCMLyJ62wLiiJ+AQ02uAhi4qr3IVFMkN9Og/GdgdcnW3M44Nvk2 u2ZvMFw7XvawKpVPqOsvP6UH7StZXJe+hTwcDFyR4YkvMX8UZ45AYU2X8o/BSqLG VwkkxqVA41ihBbJL7qKhz3Z7kj4vPWDxtDNUaW1tIFd1bmRlcmxpY2ggPHRpbW0u d3VuZGVybGljaEB0aW1td3VuZGVybGljaC5kZT6JAlQEEwEIAD4WIQQ/2/Jostx5 qcQhErpIHhRGVLS+4gUCW0XGmAIbIwUJCWYBgAULCQgHAgYVCAkKCwIEFgIDAQIe AQIXgAAKCRBIHhRGVLS+4oqTD/9oA//Dq1W5ikvD6b23Dnydg+oEOgucSejN35rG yPavozkOMda1bRMv0b515hNgpRG/PjBNpjaHyhqbuqZ45kfDEihJjKT6OrQriQSd mOO0hE5koYCvl5kOzyLzfbXsoHZjD+1x9x+BYWq5SktjpMtzhXPvFgScv0Bn85E2 QKd2XtBKWGEEEWsnfPxj8w63vL5A7njnGwq0pA7EPwHsofspRrJboN9M/zNUeft6 iM2VJPecT8AHdE2I/yGwNvn2zk373DVAIMp3yFkSSSNx1F04iNUgErzka7X40mSw ykd5MENn/7vsRRwt9ZKrRN/oXYSXoLv3nTC2TAvHIi1RdpB+X6xVlDAiXgl2WzuG vyByLc+C2W5lpRRq4HtcBSpkv0SDw97yVz1q/OKX+uPxHKz0/LfF57MfWJ19GQvI 5TiCtYSdZnoo/Mp2VG56uEtFo2vY9YuOQ1w5EhZ9nzficEX/BSS9rXqzTGbQOw/r jpuRtd+U8pVxAK9hNJU2MNuWVQ5wFg5VGzZn/WyE6t7zBaF2fnRvXEHFIlj0h/qj 4x/zCBNZTCr8sRJjIQVQAaA6/zdTdJPPH9HgDt3xUZp2bcMUssK1whZKPqYnOUPN R8D6qGjazeQFCNYH8Tcn1DNHl2rQXh14VLfw2XCVLC7rK8B7C7FXAVHBm4T5TY8R og9WfbkCDQRbRb/3ARAAqQycuV94W0Z51OFxn30WZdk+D6mAFeO2bHghNiRW0ecT +xmZjpH18qqGtNQOrSefsuJnoauqIu1oLq/Ap6HOld7KXAWCCTWiupJUT7J8JyC4 sUyuYPs4yzdNAuSskY62FwOK9hQwgAqYdlWC9Bzrqvb+dZucBTh2RBSbSPK9v+Qo 9YjPfLkTfZvCAGyweJ6mLqtxyqDcC9k9UFrH9GlJBaM9SXNr1PGY8M4FIkn4ionf CHQCD6nhJ3F6zyGMeWgw8SEERIeMo4dbFJbvonm4Y9yvXgtMxavoZZCibMEK/9xk 7/CeIB6K/UyA7ZYB3hp+vEtPiFJxA468g5stCzlmiMjxb/ETnzH40KWTmVXDvXub b1G5VtpggJR0O/tVFpqcX0qMXkoxF1cr/EYLWfgHXdP0tMctwY+qR127QKEUnCd3 hqOGydrjRMDwg58adY84yPSlwT/LEMB8vLAYXshT72WbAYycU087WXXSMoAi6yIE Bz+g5nH5WbzzEWFcx9FXNqYAGEsMq3KxMogTYT88Byd6w2NIaNf56v4oC/IAP1ui LcxMlviFPyjypg/Ty/giJPs1eKuKZWnFEP9BRrl0JJqG1vbRXvh8b+bp7s3a9rUT 4KNUbhak4ZDb8TjIcKxFcj0T4+F/XxeIijV8BXyE5Sc8oD8/Jl59k9szRmcWge0A EQEAAYkCPAQYAQgAJhYhBD/b8miy3HmpxCESukgeFEZUtL7iBQJbRb/3AhsMBQkJ ZgGAAAoJEEgeFEZUtL7iC2QP/RMe9QHT2QYn9yiw1PC7LaMvvCD6huCyjRiNf2Ys b3wlEDCIljtnSTuJzn5axwdGHKgKkZjTo/dAW4KJ33GpwQfGNB/RhMZ/6lfHZST4 Zo0oOJtZRClTeAUmvaBXQ5V8Fv4T3R9x0AD5CM3YDlNMGO8cmeoulcgogSP2BtVp YksTr0PqqojVgeZ4nejzJcV+UxF2DV5wwicojbR7DGu/neJNpRJnMgsG0ie8nRO6 elUy++R1mJ/+0BtI90MxB7nUmvnV/SzVSQU43iJlAKWRoQY/SnXulSysqtqtvf/p S9evjKCiEoF1hMgQIZdt3LMyab/YhlMwH9RUzZ+8OBvBsMFw+9oJ1NfpxH2o3FiV vLuho/T+MX8EezlhyS/LiaiPgFkI+xhMBstTje2O+ZCRMlpFt8lHZG2A1FOPQ/KJ o6fnKfNmT/D5fc1PCo2LOD5SXu4bYTgk3UEdRx/dvrb8u/Nn45eG1m8tE8KdhsQ1 gSCoSRsjW5MfPEPMHqKgFtc0/UaBpTSIpJ35NtVh9MD2EW1Gv8viRp6nh7YxlWKJ T/0WHMH+OgZ2TWy1Oz6Y5lbQyGdonKYh+aMqaXPNszXz37AGfUrkxFW070lr+XWC AmCldUIzLgVF4dKpIx2+NyaJTRtXNCgfN+zLu8de1p0FR8JBsjcOVDBlyNNERuX9 dJdX =5U14 -----END PGP PUBLIC KEY BLOCK-----

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Open Source Hackathon Mentorship Invitation
by Misha Patel 18 Feb '20

18 Feb '20

Hello, My name is Misha Patel and I’m reaching out on behalf of the HackIllinois Outreach team. HackIllinois is a 36-hour collegiate Open Source hackathon that takes place annually at the University of Illinois Urbana-Champaign. This year, it will be from February 28th-March 1st, 2020. Our mission is to introduce college students to Open Source, while giving back to the community. We strive to create a collaborative environment in which our attendees can learn from and work with developers to make their own contributions. In past years, we’ve had developers from prominent projects such as npm, Rust, and Apache come to mentor students from our pool of 900+ attendees. We’d love it if you could pass along this message to the Libvirt community or any individuals you believe would be interested. We will provide meals throughout the event and can reimburse for travel and lodging up to a certain amount depending on where in the US people are coming from. More information on mentorship can be found at hackillinois.org/mentor. You can also visit opensource.hackillinois.org to see what kinds of projects were represented at our event last year. We'd be more than happy to discuss this further. Please have any interested individuals contact us at opensource(a)hackillinois.org. Looking forward to hearing back! Best, Misha Patel HackIllinois 2020 Outreach Director misha.patel(a)hackillinois.org

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can hotplug vcpus to running Windows 10 guest, but not unplug
by Lentes, Bernd 17 Feb '20

17 Feb '20

Hi, i'm playing a bit around with vcpus. My guest is Windows 10 1903. This is the excerpt from the config: ... <vcpu placement='static' current='2'>4</vcpu> <vcpus> <vcpu id='0' enabled='yes' hotpluggable='no'/> <vcpu id='1' enabled='yes' hotpluggable='yes'/> <vcpu id='2' enabled='no' hotpluggable='yes'/> <vcpu id='3' enabled='no' hotpluggable='yes'/> </vcpus> ... I'm able to hotplug vcpus, but when i want to unplug them i get the following: virsh # setvcpus pathway 3 --live virsh # setvcpus pathway 4 --live virsh # setvcpus pathway 2 --live error: internal error: unable to execute QEMU command 'device_del': acpi: device unplug request for not supported device type: qemu64-x86_64-cpu Does anyone know why it can't be unplugged ? Thanks. Brtnf -- Bernd Lentes Systemadministration Institute for Metabolism and Cell Death (MCD) Building 35.34 - Raum 208 HelmholtzZentrum münchen bernd.lentes(a)helmholtz-muenchen.de phone: +49 89 3187 1241 phone: +49 89 3187 3827 fax: +49 89 3187 2294 http://www.helmholtz-muenchen.de/mcd Perfekt ist wer keine Fehler macht Also sind Tote perfekt Helmholtz Zentrum MÃ¼nchen Helmholtz Zentrum Muenchen Deutsches Forschungszentrum fuer Gesundheit und Umwelt (GmbH) Ingolstaedter Landstr. 1 85764 Neuherberg www.helmholtz-muenchen.de Aufsichtsratsvorsitzende: MinDir.in Prof. Dr. Veronika von Messling Geschaeftsfuehrung: Prof. Dr. med. Dr. h.c. Matthias Tschoep, Kerstin Guenther Registergericht: Amtsgericht Muenchen HRB 6466 USt-IdNr: DE 129521671

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Possible to use OVN networking and virtio simultaneously in the same VM?
by Andre Goree 15 Feb '20

15 Feb '20

I wanted to know if it's possible to use OVN networking and virtio simultaneously in the same VM? Or am I wasting my time trying to get it to work? When I try to define a VM and power it on with both types defined, networking fails to work on both. E.g.: <interface type='bridge'> <mac address='xx:xx:xx:xx:xx:xx'/> <source bridge='foo'/> <virtualport type='openvswitch'> </virtualport> <target dev='devfoo'/> </interface> <interface type='bridge'> <mac address='xx:xx:xx:xx:xx:xx'/> <source bridge='bar'/> <virtualport type='openvswitch'> </virtualport> <target dev='devbar'/> </interface> <interface type='bridge'> <mac address='xx:xx:xx:xx:xx:xx/> <source bridge='foo2'/> <model type='virtio'/> <target dev='devfoo2/> </interface> Notice the 'virtio' setting on the third NIC. If I remove that NIC from the xml or if set that NIC as a virtualport on openvswitch like the other two NICs, networking works fine. Am I missing something? Or is this a silly question to even ask?

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PCI/GPU Passthrough with xen
by Christoph 14 Feb '20

14 Feb '20

Hi All, it is possible to use pci/gpu passthrough with xen and libvirt? If yes, how is the syntax? Can I get an example? -- ------ Greetz

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ERROR Could not find an installable distribution at ....
by Kaushal Shriyan 14 Feb '20

14 Feb '20

Hi, I am trying to set up alpine Linux Guest OS using the below command #virt-install --name=mfecdrupalalphine --file=/linuxkvmguestosdisk/var/lib/libvirt/images/mfecdrupalalphine.img --file-size=100 --nonsparse --vcpus=2 --ram=6096 --network=bridge:br0 --os-type=linux --os-variant=alpinelinux3.8 --graphics none --location=/linuxkvmguestosdisk/var/lib/libvirt/isos/alpine-standard-3.11.3-x86_64.iso --extra-args="console=ttyS0" Starting install... Retrieving file .treeinfo... | 0 B 00:00:00 Retrieving file content... | 0 B 00:00:00 ERROR Could not find an installable distribution at '/linuxkvmguestosdisk/var/lib/libvirt/isos/alpine-standard-3.11.3-x86_64.iso': The URL could not be accessed, maybe you mistyped? The location must be the root directory of an install tree. See virt-install man page for various distro examples. Domain installation does not appear to have been successful. If it was, you can restart your domain by running: virsh --connect qemu:///system start mfecdrupalalphine otherwise, please restart your installation. The iso file do exist as per the below details ls -l /linuxkvmguestosdisk/var/lib/libvirt/isos/alpine-standard-3.11.3-x86_64.iso -rw-r--r-- 1 root root 127926272 Feb 12 17:49 /linuxkvmguestosdisk/var/lib/libvirt/isos/alpine-standard-3.11.3-x86_64.iso # Any clue? I look forward to hearing from you and thanks in advance. Best Regards, Kaushal

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problems with understanding of the memory parameters in the xml file
by Lentes, Bernd 13 Feb '20

13 Feb '20

Hi guys, despite reading hours and hours in the internet i'm still struggling with "memory", "currentmemory" and "maxMemory". Maybe you can help me to sort it out. My idea is that a guest has an initial value of memory (which "memory" seems to be) when booting. We have some Windows 10 guests which calculate some stuff and i would like to increase memory during runtime until it reaches a fixed maximum value. My hope was that a higher "maxMemory" could solve this, that the guest claims more memory and gets it. I didn't get it. Is my idea wrong ? Do i need a balloon driver for that ? What i find concerning ballooning is that it doesn't work automatically but has to be adjusted manually. Is that right ? Balloon drivers for windows are available. Is my idea right, does that work basically ? If yes how do i have to set the parameters ? Is the memory released after the guest has e.g. finished his calculation ? Does that work automatically or do i have to adjust that manually ? Thanks. Bernd -- Bernd Lentes Systemadministration Institute for Metabolism and Cell Death (MCD) Building 35.34 - Raum 208 HelmholtzZentrum münchen bernd.lentes(a)helmholtz-muenchen.de phone: +49 89 3187 1241 phone: +49 89 3187 3827 fax: +49 89 3187 2294 http://www.helmholtz-muenchen.de/mcd Perfekt ist wer keine Fehler macht Also sind Tote perfekt Helmholtz Zentrum MÃ¼nchen Helmholtz Zentrum Muenchen Deutsches Forschungszentrum fuer Gesundheit und Umwelt (GmbH) Ingolstaedter Landstr. 1 85764 Neuherberg www.helmholtz-muenchen.de Aufsichtsratsvorsitzende: MinDir.in Prof. Dr. Veronika von Messling Geschaeftsfuehrung: Prof. Dr. med. Dr. h.c. Matthias Tschoep, Kerstin Guenther Registergericht: Amtsgericht Muenchen HRB 6466 USt-IdNr: DE 129521671

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does the guest have a snapshot ?
by Lentes, Bernd 10 Feb '20

10 Feb '20

Hi, i'm cuurently a bit confused if a guest does have a valid snapshot or not. This is the xml: ... <disk type='file' device='disk'> <driver name='qemu' type='qcow2'/> <source file='/var/lib/libvirt/images/crispor_1604/crispor_1604.sn'/> <backingStore type='file' index='1'> <format type='raw'/> <source file='/var/lib/libvirt/images/crispor_1604/crispor_1604.img'/> <backingStore/> </backingStore> <target dev='vda' bus='virtio'/> <alias name='virtio-disk0'/> <address type='pci' domain='0x0000' bus='0x00' slot='0x04' function='0x0'/> </disk> ... both files are currently in access by the respective qemu process. lsof: qemu-kvm 19533 root 13u REG 253,0 29761732608 12091393 /var/lib/libvirt/images/crispor_1604/crispor_1604.sn qemu-kvm 19533 root 14r REG 253,0 111561775513 44793857 /var/lib/libvirt/images/crispor_1604/crispor_1604.img Here are both files: pc60181:/var/lib/libvirt/images/crispor_1604 # ll ... -rw------- 1 root root 111561775513 Oct 22 15:23 crispor_1604.img -rw-r--r-- 1 root root 29761732608 Feb 7 15:13 crispor_1604.sn crispor_1604.sn has a recent timestamp. The snapshot is currently in use: virsh # domblklist crispor_1604 Target Source ------------------------------------------------ vda /var/lib/libvirt/images/crispor_1604/crispor_1604.sn But virsh does not show any snapshot: virsh # snapshot-list crispor_1604 Name Creation Time State ------------------------------------------------------------ So i'm a bit confused. Does it have a valid snapshot or not. How can i find out and how can i get rid of it ? Thanks. Bernd -- Bernd Lentes Systemadministration Institute for Metabolism and Cell Death (MCD) Building 35.34 - Raum 208 HelmholtzZentrum münchen bernd.lentes(a)helmholtz-muenchen.de phone: +49 89 3187 1241 phone: +49 89 3187 3827 fax: +49 89 3187 2294 http://www.helmholtz-muenchen.de/mcd Perfekt ist wer keine Fehler macht Also sind Tote perfekt Helmholtz Zentrum MÃ¼nchen Helmholtz Zentrum Muenchen Deutsches Forschungszentrum fuer Gesundheit und Umwelt (GmbH) Ingolstaedter Landstr. 1 85764 Neuherberg www.helmholtz-muenchen.de Aufsichtsratsvorsitzende: MinDir.in Prof. Dr. Veronika von Messling Geschaeftsfuehrung: Prof. Dr. med. Dr. h.c. Matthias Tschoep, Kerstin Guenther Registergericht: Amtsgericht Muenchen HRB 6466 USt-IdNr: DE 129521671

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No DHCP on default network when guest has multiple interfaces
by Patrick O'Neill 07 Feb '20

07 Feb '20

Hello, I am trying to boot a VM in libvirt that has 2 interfaces. The first interface is connected to the default network and the second connects to a bridge interface on the host. When the VM boots the first interface doesn't receive an IP address from DHCP. It works when the VM only has one interface though. If I login to the VM using virsh console I noticed that in NetworkManager the connection name and device are mixed [root@localhost ~]# nmcli con show NAME UUID TYPE DEVICE eth0 cc31f368-0a43-4c85-bd15-6aaa3ca23b3d ethernet eth1 If I run 'dhclient eth0' the interface gets an IP address from the default network as expected. [root@localhost ~]# dhclient eth0 [root@localhost ~]# ip a 1: lo: <LOOPBACK,UP,LOWER_UP> mtu 65536 qdisc noqueue state UNKNOWN group default qlen 1000 link/loopback 00:00:00:00:00:00 brd 00:00:00:00:00:00 inet 127.0.0.1/8 scope host lo valid_lft forever preferred_lft forever inet6 ::1/128 scope host valid_lft forever preferred_lft forever 2: eth0: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc pfifo_fast state UP group default qlen 1000 link/ether 52:54:00:00:01:00 brd ff:ff:ff:ff:ff:ff inet 192.168.122.10/24 brd 192.168.122.255 scope global dynamic eth0 valid_lft 3599sec preferred_lft 3599sec 3: eth1: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc pfifo_fast state UP group default qlen 1000 link/ether 52:54:00:48:e3:b8 brd ff:ff:ff:ff:ff:ff inet6 fe80::5054:ff:fe48:e3b8/64 scope link noprefixroute valid_lft forever preferred_lft forever The VM is created using the following command virt-install --import --name ${VM_HOST_NAME} \ --memory 2048 --vcpus 2 --cpu host \ --disk path=/var/lib/libvirt/images/${VM_HOST_NAME}.qcow2,format=qcow2,bus=virtio \ --network network=default \ --network bridge=bridge0,model=virtio \ --os-type=linux \ --os-variant=rhel7.6 \ --graphics none Any ideas what could cause this problem? The guest OS is CentOS 7.7 and the host is CentOS 8, but I have the same problem with a CentOS 7 hypervisor.

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