December 2023 - Users - libvirt List Archives

Re: Shared memory usage
by Martin Kletzander 11 Dec '23

11 Dec '23

On Fri, Dec 08, 2023 at 09:45:23AM +0000, Sánta, Márton (ext) via Users wrote: >Dear Users, > >I tried out shared memory using libvirt. When I configure it in the XML >(ivshmem-plain), I have to provide a name for it and after starting the >VM I can see the appropriate file on the host in the /dev/shm/ >directory. My problem is that I could not find any official >documentation about the usage of that shared memory. On the guest side, >I have found the PCI device related to it, but I do not know how to use >it. Is there any available command line tool to read from or write to >this memory or is it only possible with a user application? Could you >provide my what is the most common solution for this? > Hi, ivshmem is something you probably want to use only if you have a specific need. Maybe looking at other solutions would be more suitable. In any case you can check out the documentation from QEMU here: https://www.qemu.org/docs/master/specs/ivshmem-spec.html >Thank you in advance for your reply and help! > >Best regards, > >Márton Sánta > > >This transmission is intended solely for the addressee and contains confidential information. >If you are not the intended recipient, please immediately inform the sender and delete the message and any attachments from your system. >Furthermore, please do not copy the message or disclose the contents to anyone unless agreed otherwise. To the extent permitted by law we shall in no way be liable for any damages, whatever their nature, arising out of transmission failures, viruses, external influence, delays and the like. >_______________________________________________ >Users mailing list -- users(a)lists.libvirt.org >To unsubscribe send an email to users-leave(a)lists.libvirt.org

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search docs on www.libvirt.org
by Wolfgang Rohdewald 09 Dec '23

09 Dec '23

Hi, your website allows to search Docs. This automatically uses Google. IMHO it is very unfriendly not to warn people that an external data harvester is involved in your local search. Please consider adding a warning. BTW your website massively violates EU data privacy rights. You have no Impressum and no info about your privacy policy. Your website does not even have a contact address. -- mit freundlichen Grüssen Wolfgang Rohdewald

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Shared memory usage
by Sánta, Márton (ext) 08 Dec '23

08 Dec '23

Dear Users, I tried out shared memory using libvirt. When I configure it in the XML (ivshmem-plain), I have to provide a name for it and after starting the VM I can see the appropriate file on the host in the /dev/shm/ directory. My problem is that I could not find any official documentation about the usage of that shared memory. On the guest side, I have found the PCI device related to it, but I do not know how to use it. Is there any available command line tool to read from or write to this memory or is it only possible with a user application? Could you provide my what is the most common solution for this? Thank you in advance for your reply and help! Best regards, Márton Sánta This transmission is intended solely for the addressee and contains confidential information. If you are not the intended recipient, please immediately inform the sender and delete the message and any attachments from your system. Furthermore, please do not copy the message or disclose the contents to anyone unless agreed otherwise. To the extent permitted by law we shall in no way be liable for any damages, whatever their nature, arising out of transmission failures, viruses, external influence, delays and the like.

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a VM with secure boot does not survive a reset
by lejeczek 03 Dec '23

03 Dec '23

Hi guys. A VM created with: -> $ virt-install --boot uefi --name=client-efi-secureboot --os-variant centos-stream9 --memory $((4*1024)) --graphics=vnc,listen=0.0.0.0 --accelerate --cpuset 2 --cpu host-model --pxe --disk=/00-VMsy/client-efi-secureboot.qcow2 --network network=10_3_1,,model=virtio when *virsh reset* while running will power off, instead of *restart*. Whereas: -> $ virt-install --boot uefi,firmware.feature0.name=secure-boot,firmware.feature0.enabled=no --name=client-efi-no-secureboot --os-variant centos-stream9 --memory $((4*1024)) --graphics=vnc,listen=0.0.0.0 --accelerate --cpuset 2 --cpu host-model --pxe --disk=/00-VMsy/client-efi-no-secureboot.qcow2 --network network=10_3_1,,model=virtio does behave as expected when *reset*. libvirt-libs-9.5.0-6.el9.x86_64 BTW. Where should bug reports go to theses days - I'm trying Redhat's Jira but cannot file a BZ in _RHEL_ category. I get no errors nor warnings but Jira won't let me file anything there, but I can in Centos category. thanks, L.

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Re: Libvirt and Ceph: libvirtd tries to open random RBD images
by Daniel P. Berrangé 02 Dec '23

02 Dec '23

On Mon, Nov 20, 2023 at 01:21:24PM +0000, Jayanth Reddy wrote: > Hello Daniel, > > Thank you for the response. Please also let me know why libvirtd says "No such file or directory" even though the block images exist and are healthy. I don't know the cause - all we're seeing is that the API call if ((ret = rbd_open_read_only(ptr->ioctx, vol->name, &image, NULL)) < 0) { is failing. Maybe RBD has permission denying access on this host ? Or is RBD preventing this host access the volume, becuase another VM has it in use With regards, Daniel -- |: https://berrange.com -o- https://www.flickr.com/photos/dberrange :| |: https://libvirt.org -o- https://fstop138.berrange.com :| |: https://entangle-photo.org -o- https://www.instagram.com/dberrange :|

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pxe efi boot - bdsdxe boot0002 access denied
by lejeczek 01 Dec '23

01 Dec '23

Hi guys I have VMs which fail to boot with error as per the subject. I suspect this is due to: <os firmware='efi'> <type arch='x86_64' machine='pc-q35-rhel9.2.0'>hvm</type> <firmware> <feature enabled='yes' name='enrolled-keys'/> <--- HERE <feature enabled='yes' name='secure-boot'/> <---- HERE ? </firmware> <loader readonly='yes' secure='yes' type='pflash'>/usr/share/edk2/ovmf/OVMF_CODE.secboot.fd</loader> <nvram template='/usr/share/edk2/ovmf/OVMF_VARS.secboot.fd'>/var/lib/libvirt/qemu/nvram/centos-efi_VARS.fd</nvram> <boot dev='network'/> <boot dev='hd'/> </os> Would you have any thoughts on how to fix, to work around it? many thanks, L.

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