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SubjectRe: [PATCH 0/4] KVM: x86: hyper-v: Check if guest is allowed to use XMM registers for hypercall input
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On 30/07/21 14:26, Vitaly Kuznetsov wrote:
> "KVM: x86: hyper-v: Fine-grained access check to Hyper-V hypercalls and
> MSRs" and "Add support for XMM fast hypercalls" series were developed
> at the same time so the later landed without a proper feature bit check
> for 'strict' (KVM_CAP_HYPERV_ENFORCE_CPUID) mode. Add it now.
>
> TLFS states that "Availability of the XMM fast hypercall interface is
> indicated via the “Hypervisor Feature Identification” CPUID Leaf
> (0x40000003, see section 2.4.4) ... Any attempt to use this interface
> when the hypervisor does not indicate availability will result in a #UD
> fault."
>
> Vitaly Kuznetsov (4):
> KVM: x86: hyper-v: Check access to hypercall before reading XMM
> registers
> KVM: x86: Introduce trace_kvm_hv_hypercall_done()
> KVM: x86: hyper-v: Check if guest is allowed to use XMM registers for
> hypercall input
> KVM: selftests: Test access to XMM fast hypercalls
>
> arch/x86/kvm/hyperv.c | 18 ++++++--
> arch/x86/kvm/trace.h | 15 +++++++
> .../selftests/kvm/include/x86_64/hyperv.h | 5 ++-
> .../selftests/kvm/x86_64/hyperv_features.c | 41 +++++++++++++++++--
> 4 files changed, 71 insertions(+), 8 deletions(-)
>

Queued, thanks.

Paolo

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