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    Subject[PATCH 00/14] KVM: x86: Make Hyper-V emulation optional
    Date
    RFC:
    https://lore.kernel.org/kvm/20231010160300.1136799-1-vkuznets@redhat.com/

    Changes since RFC:
    - Enhance Kconfig message [Max, Sean]
    - Introduce nested_vmx_is_evmptr12_valid [Max, Sean]
    - Collected R-b tags [Max]
    - Add a common function to allocate partition assist page [Max]
    - Fix KVM selftest to skip gracefully when !CONFIG_KVM_HYPERV
    - Other minor tweaks.

    KVM supports emulating Microsoft Hyper-V as well as running as a nested
    (L1) hypervisor on top of Hyper-V whileusing Hyper-V specific PV features.
    Support for the later is only compiled in when CONFIG_HYPERV is set. This
    series makes it possible to disable the former with a newly introduced
    CONFIG_KVM_HYPERV option. This helps to reduce sized of KVM modules as well
    as the attack surface for some specific deployments when no Windows/Hyper-V
    guests are expected. The size gain is significant:

    # CONFIG_KVM_HYPERV is not set
    # CONFIG_HYPERV is not set

    -rw-r--r--. 1 user user 3612632 Oct 10 16:53 arch/x86/kvm/kvm-amd.ko
    -rw-r--r--. 1 user user 5343968 Oct 10 16:53 arch/x86/kvm/kvm-intel.ko

    CONFIG_KVM_HYPERV=y
    # CONFIG_HYPERV is not set

    -rw-r--r--. 1 user user 3925704 Oct 10 16:51 arch/x86/kvm/kvm-amd.ko
    -rw-r--r--. 1 user user 5819192 Oct 10 16:51 arch/x86/kvm/kvm-intel.ko

    # CONFIG_KVM_HYPERV is not set
    CONFIG_HYPERV=m

    -rw-r--r--. 1 user user 3928440 Oct 10 16:40 arch/x86/kvm/kvm-amd.ko
    -rw-r--r--. 1 user user 8156464 Oct 10 16:40 arch/x86/kvm/kvm-intel.ko

    CONFIG_KVM_HYPERV=y
    CONFIG_HYPERV=m

    -rw-r--r--. 1 user user 4245440 Oct 10 16:37 arch/x86/kvm/kvm-amd.ko
    -rw-r--r--. 1 user user 8583872 Oct 10 16:37 arch/x86/kvm/kvm-intel.ko

    The series should not supposed to introduce any functional change for the
    "CONFIG_KVM_HYPERV=y && CONFIG_HYPERV=m/y" case. Tested with KVM selftests,
    kvm-unit-tests and real Windows guests on VMX and SVM. Note, kvm-unit-tests
    have to be updated to not fail miserably when CONFIG_KVM_HYPERV is not set,
    I'll send a separate series.

    Vitaly Kuznetsov (14):
    KVM: x86: xen: Remove unneeded xen context from struct kvm_arch when
    !CONFIG_KVM_XEN
    KVM: x86: hyper-v: Move Hyper-V partition assist page out of Hyper-V
    emulation context
    KVM: VMX: Split off vmx_onhyperv.{ch} from hyperv.{ch}
    KVM: x86: hyper-v: Introduce kvm_hv_synic_auto_eoi_set()
    KVM: x86: hyper-v: Introduce kvm_hv_synic_has_vector()
    KVM: VMX: Split off hyperv_evmcs.{ch}
    KVM: x86: hyper-v: Introduce kvm_hv_nested_transtion_tlb_flush()
    helper
    KVM: selftests: Make all Hyper-V tests explicitly dependent on Hyper-V
    emulation support in KVM
    KVM: selftests: Fix vmxon_pa == vmcs12_pa == -1ull
    vmx_set_nested_state_test for !eVMCS case
    KVM: x86: Make Hyper-V emulation optional
    KVM: nVMX: hyper-v: Introduce nested_vmx_evmptr12() and
    nested_vmx_is_evmptr12_valid() helpers
    KVM: nVMX: hyper-v: Introduce nested_vmx_evmcs() accessor
    KVM: nVMX: hyper-v: Hide more stuff under CONFIG_KVM_HYPERV
    KVM: nSVM: hyper-v: Hide more stuff under
    CONFIG_KVM_HYPERV/CONFIG_HYPERV

    arch/x86/include/asm/kvm_host.h | 11 +-
    arch/x86/kvm/Kconfig | 14 +
    arch/x86/kvm/Makefile | 19 +-
    arch/x86/kvm/cpuid.c | 6 +
    arch/x86/kvm/hyperv.h | 52 +-
    arch/x86/kvm/irq.c | 2 +
    arch/x86/kvm/irq_comm.c | 9 +-
    arch/x86/kvm/kvm_onhyperv.h | 20 +
    arch/x86/kvm/lapic.c | 5 +-
    arch/x86/kvm/svm/hyperv.h | 7 +
    arch/x86/kvm/svm/nested.c | 30 +-
    arch/x86/kvm/svm/svm.h | 2 +
    arch/x86/kvm/svm/svm_onhyperv.c | 10 +-
    arch/x86/kvm/vmx/hyperv.c | 447 ------------------
    arch/x86/kvm/vmx/hyperv.h | 196 ++------
    arch/x86/kvm/vmx/hyperv_evmcs.c | 315 ++++++++++++
    arch/x86/kvm/vmx/hyperv_evmcs.h | 166 +++++++
    arch/x86/kvm/vmx/nested.c | 102 ++--
    arch/x86/kvm/vmx/nested.h | 3 +-
    arch/x86/kvm/vmx/vmx.c | 18 +-
    arch/x86/kvm/vmx/vmx.h | 2 +
    arch/x86/kvm/vmx/vmx_onhyperv.c | 36 ++
    arch/x86/kvm/vmx/vmx_onhyperv.h | 125 +++++
    arch/x86/kvm/vmx/vmx_ops.h | 2 +-
    arch/x86/kvm/x86.c | 66 ++-
    .../selftests/kvm/x86_64/hyperv_clock.c | 2 +
    .../selftests/kvm/x86_64/hyperv_evmcs.c | 5 +-
    .../kvm/x86_64/hyperv_extended_hypercalls.c | 2 +
    .../selftests/kvm/x86_64/hyperv_features.c | 2 +
    .../testing/selftests/kvm/x86_64/hyperv_ipi.c | 2 +
    .../selftests/kvm/x86_64/hyperv_svm_test.c | 1 +
    .../selftests/kvm/x86_64/hyperv_tlb_flush.c | 2 +
    .../kvm/x86_64/vmx_set_nested_state_test.c | 16 +-
    33 files changed, 963 insertions(+), 734 deletions(-)
    create mode 100644 arch/x86/kvm/vmx/hyperv_evmcs.c
    create mode 100644 arch/x86/kvm/vmx/hyperv_evmcs.h
    create mode 100644 arch/x86/kvm/vmx/vmx_onhyperv.c
    create mode 100644 arch/x86/kvm/vmx/vmx_onhyperv.h

    --
    2.41.0

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