Messages in this thread | | | Subject | Re: [PATCH 0/4] KVM: x86: hyper-v: Check if guest is allowed to use XMM registers for hypercall input | From | Paolo Bonzini <> | Date | Tue, 3 Aug 2021 12:10:31 +0200 |
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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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