Merge tag 'kvm-x86-vmx-7.4' of https://github.com/kvm-x86/linux into HEAD

KVM VMX changes for 7.4

 - Enable Notify VM-Exits (now called Instruction Timeout in the SDM) and Bus
   Lock VM-Exits for TDX guests when they're enabled by userspace (KVM forgot
   to wire up the TDX Module knobs).

 - Move all common (between VMX and TDX) APIs/helpers to common.h/main.c, and
   change all namespace prefixes from "vmx" to "vt".

 - Fix a thankfully benign bug (due to other areas of KVM being hardened) where
   usersepace can bypass INIT_MEM_REGION's address wrap check by providing a
   nr_pages that will overflow a u64 when converted to bytes, and fix an also-
   benign off-by-one bug in the check (inclusive vs. exclusive).

 - Set the vmcs.GUEST_ACTIVITY_STATE back to ACTIVE when userspace sets KVM's
   mp_state to anything other than HALTED, e.g. so that a vCPU doesn't get
   stuck in HLT if userspace emulates RESET.

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