On Tue, Jun 14, 2022 at 07:20:34PM +0200, Paolo Bonzini wrote: > On 6/14/22 14:19, Vitaly Kuznetsov wrote: > > The latest version: > > https://docs.microsoft.com/en-us/virtualization/hyper-v-on-windows/tlfs/datatypes/hv_vmx_enlightened_vmcs > > > > has it, actually. It was missing before (compare with e.g. 6.0b version > > here: > > https://github.com/MicrosoftDocs/Virtualization-Documentation/raw/live/tlfs/Hypervisor%20Top%20Level%20Functional%20Specification%20v6.0b.pdf) > > > > but AFAIR TSC scaling wasn't advertised by genuine Hyper-V either. > > Interestingly enough, eVMCS version didn't change when these fields were > > added, it is still '1'. > > > > I even have a patch in my stash (attached). I didn't send it out because > > it wasn't properly tested with different Hyper-V versions. > > > > -- Vitaly > > Anirudh, can you check if Vitaly's patches work for you? I will check it. But I wonder if they fit the criteria for inclusion in stable trees... It is important for the fix to land in the stable trees since this issue is a regression that was introduced _after_ 5.13. (I probably should've mentioned this in the changelog.) Thanks, Anirudh. > > Paolo
