On 10/20/22 00:53, Sean Christopherson wrote:
On Thu, Sep 29, 2022, Jim Mattson wrote:KVM_GET_SUPPORTED_CPUID should only enumerate features that KVM actually supports. The following ranges of CPUID.8000001EH are reserved and should be masked off: EBX[31:16] ECX[31:11]LOL, APM is buggy, it says all bits in ECX are reserved. 31:0 - Reserved. 10:8 NodesPerProcessor 7:0 NodeId Advertising NodeId seems all kinds of wrong 🙁
Yeah I don't think there is any sensible way to pass this down via KVM_GET_SUPPORTED_CPUID. Making it all zeros is the only way, userspace can always compute it on its own based on the topology that it wants the guest to see. I'll send a separate patch.
Paolo
