I'm having difficulty using a nested hypervisor on Proxmox. I have a qemu guest with Proxmox installed. But when I disable "KVM hardware virtualization", the guest loads very, very slow; and I'm unable to start a nested guest. It looks like the guest is only utilizing one core (25% CPU with 4 vCPUs, 50% CPU with 2 vCPUs, etc). I've confirmed that I get this same behavior with Windows Server 2008 and Windows Server 2016.
I've played around with the CPU type. Other than not being able to nest hypervisors, leaving the CPU type to kvm64 causes the host to work perfectly fine. It seems no matter what other type I select, when I start the guest, I get "warning: TCG doesn't support requested feature: CPUID.01H:EDX.vme [bit 1]" for each virtual core I have enabled.
When I set the CPU type to "host", I get "kvm: CPU model 'host' requires KVM", and it fails to start.
I'm at a loss. The only thing I can find is that virtualization technology may not be enabled, but I've confirmed this same issue on both of my hosts. One is a Nehalem type, and the other is a Westmere type. Both are in Dell R710s, and "Virtualization Technology" is enabled in the bios. I can confirm that "cat /sys/module/kvm_intel/parameters/nested" returns a "Y".
I've played around with the CPU type. Other than not being able to nest hypervisors, leaving the CPU type to kvm64 causes the host to work perfectly fine. It seems no matter what other type I select, when I start the guest, I get "warning: TCG doesn't support requested feature: CPUID.01H:EDX.vme [bit 1]" for each virtual core I have enabled.
When I set the CPU type to "host", I get "kvm: CPU model 'host' requires KVM", and it fails to start.
I'm at a loss. The only thing I can find is that virtualization technology may not be enabled, but I've confirmed this same issue on both of my hosts. One is a Nehalem type, and the other is a Westmere type. Both are in Dell R710s, and "Virtualization Technology" is enabled in the bios. I can confirm that "cat /sys/module/kvm_intel/parameters/nested" returns a "Y".