Re: [PATCH v2 0/4] KVM: SVM: nSVM: Implement Enlightened MSR-Bitmap for Hyper-V-on-KVM

[Paolo Bonzini]

On 2/2/22 10:50, Vitaly Kuznetsov wrote:
> Changes since v1:
> - Patches 1/2 from "[PATCH 0/5] KVM: SVM: nSVM: Implement Enlightened
>    MSR-Bitmap for Hyper-V-on-KVM and fix it for KVM-on-Hyper-V" are already
>    merged, dropped.
> - Fix build when !CONFIG_HYPERV (PATCH3 "KVM: nSVM: Split off common
>    definitions for Hyper-V on KVM and KVM on Hyper-V" added).
>
> Description:
>
> Enlightened MSR-Bitmap feature implements a PV protocol for L0 and L1
> hypervisors to collaborate and skip unneeded updates to MSR-Bitmap.
> KVM already implements the feature for KVM-on-Hyper-V.
>
> Vitaly Kuznetsov (4):
>    KVM: nSVM: Track whether changes in L0 require MSR bitmap for L2 to be
>      rebuilt
>    KVM: x86: Make kvm_hv_hypercall_enabled() static inline
>    KVM: nSVM: Split off common definitions for Hyper-V on KVM and KVM on
>      Hyper-V
>    KVM: nSVM: Implement Enlightened MSR-Bitmap feature
>
>   arch/x86/kvm/hyperv.c           | 12 +--------
>   arch/x86/kvm/hyperv.h           |  6 ++++-
>   arch/x86/kvm/svm/hyperv.h       | 35 ++++++++++++++++++++++++
>   arch/x86/kvm/svm/nested.c       | 47 ++++++++++++++++++++++++++++-----
>   arch/x86/kvm/svm/svm.c          |  3 ++-
>   arch/x86/kvm/svm/svm.h          | 11 ++++++++
>   arch/x86/kvm/svm/svm_onhyperv.h | 25 +-----------------
>   7 files changed, 95 insertions(+), 44 deletions(-)
>   create mode 100644 arch/x86/kvm/svm/hyperv.h

Queued, thanks.

Paolo