virt-manager cannot execute a guest VM with more than 255 vCPU's assigned
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SUSE Linux Enterprise Server 12 SP5
Currently, virt-manager does not yet have that support available even in the latest upstream version.
This is scheduled to be resolved in a future release of SUSE Linux Enterprise once the current limitations will be resolved in the upstream version of virt-manager.
As a temporary work-around, manually editing the VM's XML file, and modify the details as per the snippets outlined in the diff below :
# diff -c centos7.0-original.xml centos7.0-280-cpu.xml *** centos7.0-original.xml 2020-12-04 16:46:42.581626099 +0100 --- centos7.0-280-cpu.xml 2020-12-04 16:47:00.229829521 +0100 *************** *** 15,21 **** </metadata> <memory unit='KiB'>4194304</memory> <currentMemory unit='KiB'>4194304</currentMemory> ! <vcpu placement='static'>64</vcpu> <os> <type arch='x86_64' machine='pc-q35-4.2'>hvm</type> <boot dev='hd'/> --- 15,21 ---- </metadata> <memory unit='KiB'>4194304</memory> <currentMemory unit='KiB'>4194304</currentMemory> ! <vcpu placement='static'>280</vcpu> <os> <type arch='x86_64' machine='pc-q35-4.2'>hvm</type> <boot dev='hd'/> *************** *** 23,28 **** --- 23,29 ---- <features> <acpi/> <apic/> + <ioapic driver='qemu'/> </features> <cpu mode='host-model' check='partial'/> <clock offset='utc'> *************** *** 147,151 **** --- 148,155 ---- <backend model='random'>/dev/urandom</backend> <address type='pci' domain='0x0000' bus='0x06' slot='0x00' function='0x0'/> </rng> + <iommu model='intel'> + <driver intremap='on' eim='on'/> + </iommu> </devices> </domain>
Using an XML file with the setting above, we were able to start a VM, in this sample CentOS, with 280 CPU's assigned
See also :
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- Document ID:000019723
- Creation Date: 05-Jan-2021
- Modified Date:05-Jan-2021
- SUSE Linux Enterprise Server
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