Setting CPU type to anything but Default KVM64 results in boot loop

Shadow Sysop

New Member
Mar 7, 2021
I'm very new to Proxmox and Hypervisors in general. VMs install and run with no issues when the CPU type is set to Default KVM64, but setting to Host (or if I specify the processor type as Westmere, which it is, it errors the same way) will result in an error when installing OS after the reboot, never successfully booting after the installation. I wanted to try VMs with CPU set to host to optimize performance but seem to be unable.


Proxmox Staff Member
Staff member
Feb 1, 2016
which os did you try to install? can you try with a different one? are there any erros in the syslog/journal?


The Proxmox community has been around for many years and offers help and support for Proxmox VE, Proxmox Backup Server, and Proxmox Mail Gateway.
We think our community is one of the best thanks to people like you!

Get your subscription!

The Proxmox team works very hard to make sure you are running the best software and getting stable updates and security enhancements, as well as quick enterprise support. Tens of thousands of happy customers have a Proxmox subscription. Get your own in 60 seconds.

Buy now!