PVE Restore CPU mismatch issue

[waynetaylor]

Re: Case #07945874. Posting this here while I await response from Veeam support.

We are trying to do a restore on a PVE 9.1 system and getting an error regarding CPU compatability. The server we are trying to restore on is a spare older server so the CPU is therefore a bit older than the original running server.

From what I understand it's failing as the processor on the restore host doesn't support some features on the original server, but I would expect to be able to force it to change processor type on restore.

The error I get is:

11/01/2026 10:37:33 Failed : gfsdc1.sgoss.local : Failed to perform restore. Failed to reach the hypervisor. Error output: kvm: warning: host doesn't support requested feature: CPUID[eax=01h].ECX.fma [bit 12] kvm: warning: host doesn't support requested feature: CPUID[eax=01h].ECX.movbe [bit 22] kvm: warning: host doesn't support requested feature: CPUID[eax=01h].ECX.f16c [bit 29] kvm: warning: host doesn't support requested feature: CPUID[eax=01h].ECX.rdrand [bit 30] kvm: warning: host doesn't support requested feature: CPUID[eax=07h,ecx=00h].EBX.fsgsbase [bit 0] kvm: warning: host doesn't support requested feature: CPUID[eax=07h,ecx=00h].EBX.bmi1 [bit 3] kvm: warning: host doesn't support requested feature: CPUID[eax=07h,ecx=00h].EBX.avx2 [bit 5] kvm: warning: host doesn't support requested feature: CPUID[eax=07h,ecx=00h].EBX.smep [bit 7] kvm: warning: host doesn't support requested feature: CPUID[eax=07h,ecx=00h].EBX.bmi2 [bit 8] kvm: warning: host doesn't support requested feature: CPUID[eax=07h,ecx=00h].EBX.erms [bit 9] kvm: warning: host doesn't support requested feature: CPUID[eax=07h,ecx=00h].EBX.invpcid [bit 10] kvm: warning: host doesn't support requested feature: CPUID[eax=80000001h].ECX.abm [bit 5] kvm: Host doesn't support requested features

thanks
Wayne

[waynetaylor]

This was the Veeam support fix to this:
-------
During restore, the VM configuration is used verbatim from the source, without checking for compatibility with the target host. This can lead to warnings or errors if the target Proxmox host does not support all CPU features requested by the original VM configuration.

To address this, you can configure the PVE Plug-in to ignore CPU parameters during restore, allowing Proxmox to apply default settings. To do so, in "C:\Program Files\Veeam\Plugins\PVE\Service\appsettings.json " find this line:

"RestoreDefaults": {
"ProxmoxDefaults": {
.........
"VmParametersToSkipOnRestore": "runningcpu, runningmachine, vmstate, vmstatestorage",

And add "cpu" there, so that it looks like this:

"VmParametersToSkipOnRestore": "runningcpu, runningmachine, vmstate, vmstatestorage, cpu”,

Then restart PVE plugin and try restore again.