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

KVM x86 misc changes for 7.4

 - Mask off the address space ID when checking for illegal usage of
   kvm_set_internal_memslot() to prevent false negatives on the sanity check.

 - Explicitly zero reserved flags when delivering a SynIC message to avoid
   leaking a byte of stack information to the guest.

 - Rework TDX's handling of the canonical MMU root level to not rely on
   userspace to fill CPUID correctly, as doing so lets userspace trivially
   trigger a KVM_BUG_ON().

 - Reject KVM_SET_NESTED_STATE if userspace "restores" L1 with EFER.LMA=1 &&
   EFER.LME=0, which confuses KVM into trying to configure an 64-bit MMU
   without PAE.

 - Ignore EFER.LMA (clear it from KVM's cached save state) if EFER.LME=0 when
   preparing L2 state, to fix another way to confuse KVM's MMU (and because
   real hardware also ignores EFER.LMA).

 - Improve KVM's sanity checks for a misconfigured MMU to (hopefully) detect
   all of the ways KVM can botch EFER.LMA vs. CR4.PAE.

 - Remove the "full" out-param from kvm_x86_ops.flush_tlb_gva() as the param
   is only used to avoid what effectively amounts to a single memory write.

 - Fix a mostly-benign bug where KVM can write through a guest's read-only
   mapping due to not checking the error code when expediting emulated MMIO
   page faults.

 - Honor the guest's view of the "EFER.LMSLE must be zero" defeature so that
   userspace can provide migration compatibility between Rome and Milan+.

 - Pend a KVM_REQ_EVENT request when an exception is morphed into a nested
   VM-Exit, otherwise KVM can fail to actually deliver the nested VM-Exit,
   e.g. when injecting a page fault.

 - Add support for PML on SVM.

 - Add support for virtualizing Bus Lock Detect on SVM, and fix a number of
   DR6 bugs and warts along the way.

 - Misc fixes and cleanups.

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