Vitaly Kuznetsov <vkuznets@xxxxxxxxxx> writes: > Anirudh Rayabharam <anrayabh@xxxxxxxxxxxxxxxxxxx> writes: > > ... > >> >> As per the comments in arch/x86/kvm/vmx/evmcs.h, TSC multiplier field is >> currently not supported in EVMCS. > > 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. And of course I forgot a pre-requisite patch which updates 'struct hv_enlightened_vmcs' to the latest: diff --git a/arch/x86/include/asm/hyperv-tlfs.h b/arch/x86/include/asm/hyperv-tlfs.h index 0a9407dc0859..038e5ef9b4a6 100644 --- a/arch/x86/include/asm/hyperv-tlfs.h +++ b/arch/x86/include/asm/hyperv-tlfs.h @@ -559,9 +559,20 @@ struct hv_enlightened_vmcs { u64 partition_assist_page; u64 padding64_4[4]; u64 guest_bndcfgs; - u64 padding64_5[7]; + u64 guest_ia32_perf_global_ctrl; + u64 guest_ia32_s_cet; + u64 guest_ssp; + u64 guest_ia32_int_ssp_table_addr; + u64 guest_ia32_lbr_ctl; + u64 padding64_5[2]; u64 xss_exit_bitmap; - u64 padding64_6[7]; + u64 host_ia32_perf_global_ctrl; + u64 encls_exiting_bitmap; + u64 tsc_multiplier; + u64 host_ia32_s_cet; + u64 host_ssp; + u64 host_ia32_int_ssp_table_addr; + u64 padding64_6; } __packed; #define HV_VMX_ENLIGHTENED_CLEAN_FIELD_NONE 0 -- Vitaly
