On 27/09/19 19:14, Sean Christopherson wrote: >> >> Perhaps we can make all MSRs supported unconditionally if >> host_initiated. For unsupported performance counters it's easy to make >> them return 0, and allow setting them to 0, if host_initiated > I don't think we need to go that far. Allowing any ol' MSR access seems > like it would cause more problems than it would solve, e.g. userspace > could completely botch something and never know. Well, I didn't mean really _all_ MSRs, only those returned by KVM_GET_MSR_INDEX_LIST. > For the perf MSRs, could we enumerate all arch perf MSRs that are supported > by hardware? That would also be the list of MSRs that host_initiated MSR > accesses can touch regardless of guest support. Yes, that is easy indeed. Any ideas about VMX? Paolo
