Anirudh Rayabharam <anrayabh@xxxxxxxxxxxxxxxxxxx> writes: > 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.) > Personally, I see no problem with splitting off TscMultiplier part from my patch and marking it for stable@ fixing d041b5ea93352. I'm going to run some tests too. -- Vitaly
