linux-kernel - [PATCH RFC v1 0/5] KVM: VMX: Support TscScaling and EnclsExitingBitmap whith eVMCS

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Date:   Wed, 15 Jun 2022 14:49:10 +0200
From:   Vitaly Kuznetsov <vkuznets@...hat.com>
To:     kvm@...r.kernel.org, Paolo Bonzini <pbonzini@...hat.com>,
        Anirudh Rayabharam <anrayabh@...ux.microsoft.com>
Cc:     Sean Christopherson <seanjc@...gle.com>,
        Wanpeng Li <wanpengli@...cent.com>,
        Jim Mattson <jmattson@...gle.com>,
        linux-hyperv@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: [PATCH RFC v1 0/5] KVM: VMX: Support TscScaling and EnclsExitingBitmap whith eVMCS

Enlightened VMCS v1 definition was updates to include fields for the
following features:
    - PerfGlobalCtrl
    - EnclsExitingBitmap
    - TSC scaling
    - GuestLbrCtl
    - CET
    - SSP

Add support for EnclsExitingBitmap and TSC scaling to KVM. PerfGlobalCtrl 
doesn't work correctly with Win11, don't enable it yet. SSP, CET and 
GuestLbrCtl are not currently supported by KVM.

RFC part: the change dropping SECONDARY_EXEC_TSC_SCALING from 
EVMCS1_UNSUPPORTED_2NDEXEC likely breaks migration for Hyper-V on KVM: in
case guest which started on a 'fixed' KVM and uses TSC multiplier feature
gets migrated to an older 'unfixed' KVM the feature will become unusable.
Unfortunately, eVMCS's version is still '1' so we probably need a new
CAP in KVM to make TSC scaling an explicit opt-in.

Vitaly Kuznetsov (5):
  x86/hyperv: Fix 'struct hv_enlightened_vmcs' definition
  x86/hyperv: Update 'struct hv_enlightened_vmcs' definition
  KVM: VMX: Define VMCS-to-EVMCS conversion for the new fields
  KVM: nVMX: Support several new fields in eVMCSv1
  KVM: VMX: Support TSC scaling with enlightened VMCS

 arch/x86/include/asm/hyperv-tlfs.h | 19 ++++++++++++++----
 arch/x86/kvm/vmx/evmcs.c           | 26 +++++++++++++++++++++++++
 arch/x86/kvm/vmx/evmcs.h           | 11 ++++-------
 arch/x86/kvm/vmx/nested.c          | 31 ++++++++++++++++++++++++++++++
 4 files changed, 76 insertions(+), 11 deletions(-)

-- 
2.35.3