Merge tag 'kvm-x86-misc-7.1' of https://github.com/kvm-x86/linux into HEAD

KVM x86 misc changes for 7.1

 - Advertise support for AVX512 Bit Matrix Multiply (BMM) when it's present in
   hardware (no additional emulation/virtualization required).

 - Immediately fail the build if a required #define is missing in one of KVM's
   headers that is included multiple times.

 - Reject SET_GUEST_DEBUG with -EBUSY if there's an already injected exception,
   mostly to prevent syzkaller from abusing the uAPI to trigger WARNs, but also
   because it can help prevent userspace from unintentionally crashing the VM.

 - Exempt SMM from CPUID faulting on Intel, as per the spec.

 - Misc hardening and cleanup changes.

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