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SubjectRe: [PATCH v2 00/30] KVM: x86: hyper-v: Fine-grained access check to Hyper-V hypercalls and MSRs
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On 21/05/21 11:51, Vitaly Kuznetsov wrote:
> Changes since v1:
> - Rebase to kvm/next.
>
> Original description:
>
> Currently, all implemented Hyper-V features (MSRs and hypercalls) are
> available unconditionally to all Hyper-V enabled guests. This is not
> ideal as KVM userspace may decide to provide only a subset of the
> currently implemented features to emulate an older Hyper-V version,
> to reduce attack surface,... Implement checks against guest visible
> CPUIDs for all currently implemented MSRs and hypercalls.
>
> Vitaly Kuznetsov (30):
> asm-generic/hyperv: add HV_STATUS_ACCESS_DENIED definition
> KVM: x86: hyper-v: Introduce KVM_CAP_HYPERV_ENFORCE_CPUID
> KVM: x86: hyper-v: Cache guest CPUID leaves determining features
> availability
> KVM: x86: hyper-v: Prepare to check access to Hyper-V MSRs
> KVM: x86: hyper-v: Honor HV_MSR_HYPERCALL_AVAILABLE privilege bit
> KVM: x86: hyper-v: Honor HV_MSR_VP_RUNTIME_AVAILABLE privilege bit
> KVM: x86: hyper-v: Honor HV_MSR_TIME_REF_COUNT_AVAILABLE privilege bit
> KVM: x86: hyper-v: Honor HV_MSR_VP_INDEX_AVAILABLE privilege bit
> KVM: x86: hyper-v: Honor HV_MSR_RESET_AVAILABLE privilege bit
> KVM: x86: hyper-v: Honor HV_MSR_REFERENCE_TSC_AVAILABLE privilege bit
> KVM: x86: hyper-v: Honor HV_MSR_SYNIC_AVAILABLE privilege bit
> KVM: x86: hyper-v: Honor HV_MSR_SYNTIMER_AVAILABLE privilege bit
> KVM: x86: hyper-v: Honor HV_MSR_APIC_ACCESS_AVAILABLE privilege bit
> KVM: x86: hyper-v: Honor HV_ACCESS_FREQUENCY_MSRS privilege bit
> KVM: x86: hyper-v: Honor HV_ACCESS_REENLIGHTENMENT privilege bit
> KVM: x86: hyper-v: Honor HV_FEATURE_GUEST_CRASH_MSR_AVAILABLE
> privilege bit
> KVM: x86: hyper-v: Honor HV_FEATURE_DEBUG_MSRS_AVAILABLE privilege bit
> KVM: x86: hyper-v: Inverse the default in hv_check_msr_access()
> KVM: x86: hyper-v: Honor HV_STIMER_DIRECT_MODE_AVAILABLE privilege bit
> KVM: x86: hyper-v: Prepare to check access to Hyper-V hypercalls
> KVM: x86: hyper-v: Check access to HVCALL_NOTIFY_LONG_SPIN_WAIT
> hypercall
> KVM: x86: hyper-v: Honor HV_POST_MESSAGES privilege bit
> KVM: x86: hyper-v: Honor HV_SIGNAL_EVENTS privilege bit
> KVM: x86: hyper-v: Honor HV_DEBUGGING privilege bit
> KVM: x86: hyper-v: Honor HV_X64_REMOTE_TLB_FLUSH_RECOMMENDED bit
> KVM: x86: hyper-v: Honor HV_X64_CLUSTER_IPI_RECOMMENDED bit
> KVM: x86: hyper-v: Honor HV_X64_EX_PROCESSOR_MASKS_RECOMMENDED bit
> KVM: selftests: move Hyper-V MSR definitions to hyperv.h
> KVM: selftests: Move evmcs.h to x86_64/
> KVM: selftests: Introduce hyperv_features test
>
> Documentation/virt/kvm/api.rst | 11 +
> arch/x86/include/asm/kvm_host.h | 9 +
> arch/x86/kvm/hyperv.c | 216 +++++-
> arch/x86/kvm/hyperv.h | 1 +
> arch/x86/kvm/x86.c | 4 +
> include/asm-generic/hyperv-tlfs.h | 1 +
> include/uapi/linux/kvm.h | 1 +
> tools/testing/selftests/kvm/.gitignore | 1 +
> tools/testing/selftests/kvm/Makefile | 1 +
> .../kvm/include/{ => x86_64}/evmcs.h | 2 +-
> .../selftests/kvm/include/x86_64/hyperv.h | 185 +++++
> .../selftests/kvm/x86_64/hyperv_clock.c | 8 +-
> .../selftests/kvm/x86_64/hyperv_features.c | 649 ++++++++++++++++++
> 13 files changed, 1071 insertions(+), 18 deletions(-)
> rename tools/testing/selftests/kvm/include/{ => x86_64}/evmcs.h (99%)
> create mode 100644 tools/testing/selftests/kvm/include/x86_64/hyperv.h
> create mode 100644 tools/testing/selftests/kvm/x86_64/hyperv_features.c
>

Queued, thanks.

Paolo

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