- Users - libvirt List Archives

[libvirt-users] Debugging Windows 10 Guest Flakiness
by David Morrison 02 Jun '17

02 Jun '17

Hello, I'm not sure if I'm asking this question in the right place, so please redirect me if there's a better list. I recently set up a Windows 10 guest on an Arch Linux host with libvirt and KVM/Qemu, using IOMMU to enable GPU passthrough. I followed this guide to set up the VM: https://wiki.archlinux.org/index.php/PCI_passthrough_via_OVMF The problem that I'm having is that the guest is very flaky: sometimes the guest will just hang indefinitely, and sometimes the guest loses network connectivity. Usually when either of these behaviors happens, restarting the libvirtd daemon on the host resolves the issue, but that's not always true, and sometimes when I restart libvirtd it causes my entire (host) machine to lock up! I have enabled log_output level 1 in /etc/libvirt/libvirtd.conf and have monitored the log file during one of these hangs, but I don't see any obvious errors or problems in the log file itself (and there's a lot of information to sort through, so I may have missed something). Some specifics about my setup: Motherboard: ASUS Sabertooth X79 CPU: Intel i7 4930K Host GPU: GeForce GT 730 Guest GPU: GeForce GTX 780 Virtual network interface: NAT with the virtio driver I'm *reasonably* confident that the problem is not with the GPU passthrough setup, as I'm able to run FurMark (a GPU burn-in tool) on the guest with no problems. However, I haven't yet been able to reliably reproduce the error at all, so I'm pretty much at a loss as to where to go from here. Can anyone on this list point me in a good direction to look, or have you seen anything like this before? I'm happy to provide debug logs or any other information that is helpful, as well. Thanks for your time, David

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[libvirt-users] No way to stop virStream error after guest stop
by JosÉ Luis Valencia Gutierrez 02 Jun '17

02 Jun '17

Hello everyone, I am opening a virChannel(unix) to a domain and receiving data with a non-blocking virStream using events, when the connected domain gets stopped(which deletes the channel unix socket) by calling destroy, shutdown, pause or migrate on that domain, with the stream open the read event is triggered repeatedly, and virStreamRecv returns 0 bytes indicating EOF but neither virStreamFinish nor virStreamFinish is working to stop the stream to trigger the event . Each time the event is called I got this errors. libvirt: I/O Stream Utils error : this function is not supported by the connection driver: virStreamRecv libvirt: I/O Stream Utils error : this function is not supported by the connection driver: virStreamFinish libvirt: I/O Stream Utils error : this function is not supported by the connection driver: virStreamEventRemoveCallback Is there other way to stop getting this errors? or perhaps this is a bug. Thanks in advance. Jose Valencia

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[libvirt-users] libvirtd not accepting connections
by Michael C. Cambria 01 Jun '17

01 Jun '17

Hi, Ever since I recently upgraded to Fedora 25, I can't get kvm working. It's worked on this system since initial fedora 20 install. All upgrades were done via yum, then once available, dnf. I do have libvirt-sock in LISTENING state: STREAM LISTENING /var/run/libvirt/libvirt-sock I noticed I also have multiple connections in CONNECTING state: STREAM CONNECTING 0 /var/run/libvirt/libvirt-sock STREAM CONNECTING 0 /var/run/libvirt/libvirt-sock STREAM CONNECTING 0 /var/run/libvirt/libvirt-sock I rebooted and tried again. Each e.g. 'virsh -c" or virt-manager command I issue, I end up with another socket in CONNECTING state. restarting libvirtd.service close them leaving just one LISTENING strace for virsh -c shows: 4301 socket(AF_UNIX, SOCK_STREAM, 0) = 5 4301 connect(5, {sa_family=AF_UNIX, sun_path="/var/run/libvirt/libvirt-sock"}, 110) = 0 4301 getsockname(5, {sa_family=AF_UNIX}, [128->2]) = 0 4301 futex(0x7f3c0a2e4fc8, FUTEX_WAKE_PRIVATE, 2147483647) = 0 4301 fcntl(5, F_GETFD) = 0 4301 fcntl(5, F_SETFD, FD_CLOEXEC) = 0 4301 fcntl(5, F_GETFL) = 0x2 (flags O_RDWR) 4301 fcntl(5, F_SETFL, O_RDWR|O_NONBLOCK) = 0 systemctl status libvirtd.service and journalctl -f -u libvirtd.service do not show any log entries for libvird after it has been started. e.g. it doesn't log anything about the connection attempts. Anyone have an idea where to look next? Thanks, MikeC

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[libvirt-users] VM memory monitor
by zhunxun＠gmail.com 01 Jun '17

01 Jun '17

Hello，I want to know what the "virsh dommemstat " really stand for?the rss in result really indicatre the physical memory that the VM has used? thanks! zhunxun(a)gmail.com

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[libvirt-users] Hopefully simple question
by Leroy Tennison 31 May '17

31 May '17

Is there a way to determine what the hypervisor default NIC is? I'm using kvm/libvirt/qemu. If this is the wrong forum please please reply with that.

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[libvirt-users] Another hopefully simple question
by Leroy Tennison 31 May '17

31 May '17

Actually the last for now. Is there a way to determine from the hypervisor (kvm/libvirt/qemu) if a VM has unmounted a partition?

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[libvirt-users] can't establish more than 1000 connections with virsh
by dw 26 May '17

26 May '17

Hi: I'm trying to connect with libvirtd with virsh from a remote PC,but only can establish 1000 connections. If try more connections,prompt: "error: failed to connect to the hypervisor error: Failed to open file '/etc/libvirt/libvirt.conf': Too many open files" I tried in another PC,also get the same prompt. Anybody know why? Thanks! environment: libvirt:libvirt-2.0.0-10.el7 OS:centos7.3

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[libvirt-users] nwfilter - how to protect VM's
by Thiago Oliveira 25 May '17

25 May '17

Hello guys! I have just one physical NIC (eth0) and some libvirt networks. Each network created represents one customer and it is working fine. My question is how can I protect between the customer's networks? For example: The host 192.168.2.2 from the network 192.168.2.0/30 can not access any VM in others networks but the 192.168.2.2 can access 192.168.0.1 because it is the gateway to the internet and this host can receive incoming connections from the internet. I would like to tag with VLAN for example but I don't have sure if this is the best way. See below my route table [image: Imagem inline 1] Thank you guys. Thiago

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[libvirt-users] How to show underlying QEMU command line using virsh
by Roman Storozhenko 24 May '17

24 May '17

Hello, everybody I use virt to run my VM's and QEMU as a hypervisor. There is a file describing my virtual machine: /etc/libvirt/qemu/centos7.0.xml As you know it contains xml representation of my VM. Is there any way to show underlying qemu command that virsh runs using that file? For example: qemu-system-x86-64 -m 1024 -smp 2 -... If no, is there any way to figure it out during VM run ? --- Thanks in advance, Roman Storozhenko

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[libvirt-users] How to set guest console size in libvirt configuration options?
by Roman Storozhenko 24 May '17

24 May '17

Hello, everybody I use virsh to run my VM and QEMU as a hypervisor. When I connect to it, it shows me a console with a some predefined size. I know that I am able to update grub configuration to pass the correct size as a kernel command line option or use stty something like: stty rows 62 cols 213 and it's resizes correctly. But is there any way to define the console's size outside the guest, in the VM's configuration? --- Thanks in advance, Roman Storozhenko

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