linux-kernel - [PATCH 0/4] KVM: x86: hyper-v: Check if guest is allowed to use XMM registers for hypercall input

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Message-Id: <20210730122625.112848-1-vkuznets@redhat.com>
Date:   Fri, 30 Jul 2021 14:26:21 +0200
From:   Vitaly Kuznetsov <vkuznets@...hat.com>
To:     kvm@...r.kernel.org, Paolo Bonzini <pbonzini@...hat.com>
Cc:     Sean Christopherson <seanjc@...gle.com>,
        Wanpeng Li <wanpengli@...cent.com>,
        Jim Mattson <jmattson@...gle.com>,
        Siddharth Chandrasekaran <sidcha@...zon.de>,
        linux-kernel@...r.kernel.org
Subject: [PATCH 0/4] KVM: x86: hyper-v: Check if guest is allowed to use XMM registers for hypercall input

"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(-)

-- 
2.31.1